Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Acartiidae ( Family )
            Acartia ( Genus )
                Acanthacartia ( Sub-Genus )
Acartia (Acanthacartia) tonsa  Dana, 1849   (F, M)
Syn.: Acartia giesbrechti Dahl, 1894 c (p.13, 22, Rem.: Mouth of the Tocantins River, in the lower salinities 5.69 to 34.5 p.1000); Steuer, 1915; 1923 (p.23, figs.F,M); Björnberg, 1963 (p.66, Rem.);
? Acartia bermudensis Esterly, 1911 b (p.224, figs.F,M); Owre & Foyo, 1967 (p.101, figs.F,M);
? Acartia floridana Davis, 1948 (p.82, figs.F,M);
Acartia tonsa cryophylla Björnberg, 1963 (p.64, figs.F,M);
Acartia gracilis Herrick, 1887;
Acartia tonsa s.l. : Brinton & al., 1986 (p.228, Table 1).
Giesbrecht, 1892 (p.508, 522, 770, figs.F,M); Giesbrecht & Schmeil, 1898 (p.154); Wheeler, 1901 (p.183, figs.F,M); Esterly, 1905 (p.204, figs.F,M); Sharpe, 1910 (p.414, fig.F); Steuer, 1923 (p.23, figs.F,M); Esterly, 1924 (p.105, figs.F,M); Remy, 1927 a (p.171, figs.F,M, Rem.); Wilson, 1932 a (p.160, figs.F,M); Rose, 1933 a (p.276, figs.F,M); Redeke, 1934 (p.39, figs.F, Rem.); Davis, 1944 (p.3); Farran, 1948 a (n°12, p.3, figs.F); Brodsky, 1950 (1967) (p.426, figs.F,M); Carvalho, 1952 a (p.152, Rem.M); ); Conover, 1956 (p.156 & suiv., figs.N, juv.); Anraku & Omori, 1963 (p.118, figs. mouth parts); Vervoort, 1964 a (p.24); 1965 (p.198, Rem.); Bowman, 1965 (p.150: Rem.); Gonzalez & Bowman, 1965 (p.257, figs.F,M, Rem.); Faber, 1966 p.191, fig.N); Ramirez, 1966 (p.19, figs.F,M); Marques, 1966 (p.10); Vidal, 1968 (p.41, figs.F,M); Pallares, 1968 b (p.29, figs.F, M); Ramirez, 1969 (p.84, fig.F, Rem.); Shih & al., 1971 (p.31); Arcos, 1975 (p.23, figs.F,M); Dawson, 1979 (1980) (p.1, figs.F,M); Dawson & Knatz, 1980 (p.8, figs.F,M); Miller & al., 1980 (p.349, figs. Md: F, juv.V); Brylinski, 1981 (p.255, figs.F,M, carte); Björnberg & al., 1981 (p.661, figs.F,M, Rem.); Sazhina, 1982 (p.1160, Rem., fig.N); Schnack, 1982 (p.89, figs.Mx2, Md, Mxp); Montu & Gloeden, 1982 (p.361, anomalies); Gaudy & Vinas, 1985 (p.227); Sazhina, 1985 (p.83, figs.N); Zamora-Sanchez & Gomez-Aguirre, 1986 (p.339, figs.F,M, Rem.); Blades-Eckelbarger, 1991 (p.262, fig.F); Sabatini, 1990 (p.53, figs.juv.1-5, F,M); Belmonte & al., 1994 (p.9, figs.F,M); Garmew & al., 1994 (p.149, Rem.); Mazzocchi & al., 1995 (p.65, figs.F,M, Rem.); Hassett & Blades-Eckelbarger, 1995 (p.59, fig., 3, gut morphology, gut cells, digestive activities); Behrends & al., 1997 (p.594, figs.F); Hoffmeyer & Prado Figueroa, 1997 (p.257, figs.); Chen & Marcus, 1997 (p.587, Rem: œuf); Belmonte, 1998 a (p.38, fig., Rem.: Eggs); Bradford-Grieve, 1999 (n°181, p.5, figs.F,M); Barthélémy, 1999 (p.858, 864, figs.F); 1999 a (p.9, Fig.23, K-M); Bradford-Grieve & al., 1999 (p.886, 962, figs.F,M); Castro-Longoria, 2001 (p.225, fig.4); Prusova & al., 2002 (p.65, figs.F,M); Caudill & Bucklin, 2004 (p.91: genetic diversity); Giesecke & Gonzalez, 2004 (p.607, fig.: Md); G. Harding, 2004 (p.24, figs.F,M); Ferrari & Dahms, 2007 (p.63, 71, Rem., Table VIII); Avancini & al., 2006 (p.115, Pl. 83, figs.F,M, Rem.); Vives & Shmeleva, 2007 (p.428, figs.F,M, Rem.); Chen & Hare, 2011 (p.2425, genetic); Laakmann & al., 2013 (p.862, figs.1, 2, 3, 5, Table 1, 2, molecular Biology).
Species Acartia (Acanthacartia) tonsa - Plate 1 of morphological figuresissued from : J.M. Brylinski in J. Plankton Res., 1981, 3 (2). [Fig.2, p.257].
Structure of P5 of the Acartia in the wet docks of the harbour of Dunkirk (Strait of Dover). Male and Female

a: Acartia clausi; b: A. tonsa, c: A. discaudata, d: A. bifilosa

c.f.: curved finger, c.n.: curved needle, d.t.: distal tooth, l.: lamella, l.p.: lamellar process, p.t.: proximal tooth, s.: setae, sp.: spines, 3, segment 3 of left leg.

Species Acartia (Acanthacartia) tonsa - Plate 2 of morphological figuresIssued from: M.G. Mazzocchi, G. Zagami, A. Ianora, L. Guglielmo & J. Hure in Atlas of Marine Zooplankton Straits of Magellan. Copepods. L. Guglielmo & A. Ianora (Eds.), 1995. [p.67, Fig.3.7.1].
Female: habitus (dorsal); B, urosome (dorsal); C, P5.
Nota: Proportional lengths of urosomites and furca 46:16:18:20 = 100.

Male: D, habitus (dorsal); E, urosome (dorsal); F, P5.
Nota: Proportional lengths of urosomites and furca 16:29:18:8:14:15 = 100.

Remarks: Both females and males of this species are hightly variable in the ornamentation of the urosomal somites. The specimens from Straits of Magellan resemble those described by Björnberg (1963) as A. tonsa var. cryophylla due to the remarkably reduced ornamentation of the urosome.

Species Acartia (Acanthacartia) tonsa - Plate 3 of morphological figuresissued from : P. Remy in Annales de Biologie Lacustre, 1926 (1927 a), XV. [p.172, Fig.I].
Female (from Ouistreham): 1, forehead (ventral), r = rostral filaments; 2, idem (lateral); 3, last thoracic segment (T) and 1st urosomal segment (A); 4, idem (lateral right side), s = seminal receptacle, S = spermatophore; 5, urosome (dorsal), F & F' = caudal rami; 6, P4.

Species Acartia (Acanthacartia) tonsa - Plate 4 of morphological figuresissued from : P. Remy in Annales de Biologie Lacustre, 1926 (1927 a), XV. [p.173, Fig.II].
Female (from Ouistreham): P5 (lateral view), (b = basal part; d = spinules; f = seta; m = muscles; p = lamellar process); 2, P5 (anterior view) (A and A' = basal segments).

Species Acartia (Acanthacartia) tonsa - Plate 5 of morphological figuresissued from : P. Remy in Annales de Biologie Lacustre, 1926 (1927 a), XV. [p.175, Fig.III).
Male: 1, urosome (dorsal) (1 = genital somite; F & F' = caudal rami); 2, P5 (anterior view) (d = distal segment of left leg).

Species Acartia (Acanthacartia) tonsa - Plate 6 of morphological figuresIssued from: M.G. Mazzocchi, G. Zagami, A. Ianora, L. Guglielmo & J. Hure in Atlas of Marine Zooplankton Straits of Magellan. Copepods. L. Guglielmo & A. Ianora (Eds.), 1995. [p.68, Fig.3.7.2].
Female (SEM preparation): B, urosome (dorsal), with a rows of small spinules on genital somite; C, detail of inner posterior margins of last thoracic somite (dorsal); D, urosome (lateral right side), with spermatophore attached to genital somite.; E, detail of spermatophore; F, P5; G, detail of distal end of P5.
Bars: B, D 0.050; C, E, G, 0.010 mm.

Species Acartia (Acanthacartia) tonsa - Plate 7 of morphological figuresIssued from: M.G. Mazzocchi, G. Zagami, A. Ianora, L. Guglielmo & J. Hure in Atlas of Marine Zooplankton Straits of Magellan. Copepods. L. Guglielmo & A. Ianora (Eds.), 1995. [p.69, Fig.3.7.3].
Female (SEM preparation): B, urosome (dorsal); C, idem (ventral); D, P5 (posterior); E, right P5; F, detail of last segment of left P5.
Bars: B, C 0.050 mm; D, E, F 0.010 mm.

Species Acartia (Acanthacartia) tonsa - Plate 8 of morphological figuresissued from : Giesecke & Gonzalez in Rev. Chil. Hist. Nat., 2004, 77. [p.610, Fig. 2 A]. Schematic drawing of the cutting edge of the left mandible blade of Acartia tonsa from Mejillones Bay, Chile .
Mean (SD: standard deviation in parenthesis) Itoh's edge index: 896 (43), n = 14 specimens.
Scale bar = 0.010 mm.
Based on the Itoh index, the species belong to \"Type II\", a group that utilizes both suspension and raptorial feeding modes to capture particles and zooplankton. The edge index would include this species into the omnivorous, with certain tendancy to carnivory (due to the proximity of the index to 900). Vargas & Gonzalez (2004) estimated that heterotrophic prey (microzooplankton) could contribuate to 1/3 of the total ingested carbon and the other 2/3 would be provided by autotrophic prey.

Species Acartia (Acanthacartia) tonsa - Plate 9 of morphological figuresissued from : F.C. Ramirez in Contr. Inst. Biol. mar., Buenos Aires, 1969, 98. [p.80, Lam. XVI, fig.135 ].
Female (from off Mar del Plata): 135, P5.
Scale bar in mm: 0.05.

Species Acartia (Acanthacartia) tonsa - Plate 10 of morphological figuresissued from : F.C. Ramirez in Bol. Inst. Biol. Mar., Mar del Plata, 1966, 11. [Lam.VI, Figs.8-14]
Female (from off Mar del Plata): 8, habitus (lateral right side)10, P5; 11, urosome (lateral left side); 12, idem.

Male: 9, urosome (dorsal); 13, habitus (dorsal); 14, P5.

Species Acartia (Acanthacartia) tonsa - Plate 11 of morphological figuresissued from : W. Giesbrecht in Fauna Flora Golf. Neapel, 1892, 19. [Taf.43, Fig.6].
Male: 6, urosome (dorsal).

Species Acartia (Acanthacartia) tonsa - Plate 12 of morphological figuresissued from : W. Giesbrecht in Fauna Flora Golf. Neapel, 1892, 19. [Taf.30, Fig.7].
Male: 7, right A1 (segments 18 and 19-21).

Species Acartia (Acanthacartia) tonsa - Plate 13 of morphological figuresissued from : W. Giesbrecht in Fauna Flora Golf. Neapel, 1892, 19. [Taf.30, Fig.24].
Female: 24, P5.

Species Acartia (Acanthacartia) tonsa - Plate 14 of morphological figuresissued from : W. Giesbrecht in Fauna Flora Golf. Neapel, 1892, 19. [Taf.30, Fig.34].
Male: 34, P5.

Species Acartia (Acanthacartia) tonsa - Plate 15 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1924, 26 (5). [p.106, Fig. N).
Female (from San Francisco Bay): 1, forehead (lateral); 2, A1 (ventral); 3, forehead (ventral); 4, outline of posterior margin of thorax, to show spines; 5, margin of thorax and genital segment (lateral); 6, outline of posterior margin of thorax (lateral); 7, genital segment (ventral); 8, terminal part of Mxp; 9, habitus (lateral); 10, idem (dorsal); 11, urosome (lateral); 12, P4; 13, P3; 14, P2; 15, P1; 16, A2 (ventral); 17, 17-18, P5 (from side,; different specimens); 19, Md (citting edge); 20, P5.
Nota: Relative lenfths of abdominal segments and caudal rami 11:4:2:5. 1st and 2nd abdominal segments with row of small teeth on posterior border

Species Acartia (Acanthacartia) tonsa - Plate 16 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1924, 26 (5). [p.107, Fig. O).
Male: 1, forehead (lateral); 2, urosome (dorsal); 3, habitus (dorsal); 4, grasping A1; 5, last thoracic and 1st abdominal segments; 6-7, outline of margin of last thoracic segment (lateral; different individuals) to show spines; 8, urosome (dorsal) from differnt specimen than in 2; 9, P1; 10, P5 (right foot at left); 11, end segment of left P5 (from a second specimen); 12-13, outlines of margin of last thoracic segment in two individuals, to show spines (lateral); 14, Segments of A1 proximal and distal to geniculation (proximal one at left); 15, terminal portion of Mxp; 16, urosome and margin of last thoracic segment (lateral).
Nota: Relative lengths of abdominal segments and caudal rami 22:32:18:6:9:15. 1st segment with tuft of hairs on each side; row of delicate hairs each side of last segment; posterior, dorsal margin of 2nd to 4th with row of small teeth which, in second, extend along sides.

Species Acartia (Acanthacartia) tonsa - Plate 17 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1905, 2 (4). [p.204, Fig.49].
Female (from San Diego Bay): a, habitus (dorsal); d, P5.

Male: b, urosome (dorsal); c, P5 (dx = right foot).

Species Acartia (Acanthacartia) tonsa - Plate 18 of morphological figuresissued from : C.B. Miller, D.M. Nelson, R.L. Guillard & B.I. Woodward in Biol. Bull., 1980, 159 [p.350, Fig.1]. Scanning electron micrograph by A. Cornell-Bell.
Female (from NW Atlantic: Vineyard Sound, Massachusetts): Mandibular gnathobase of adult reared at 12.6 microMol silicic acid.
V = ventral tooth; C1 = large central tooth; C2 = smaller central tooth; L = limit of siliceous caps; N = nonsiliceous dorsal spine.
Black bar represents 10 microns.
Nota: A. tonsa has three siliceous teeth: a curving spine on the ventral end of the tooth list (V), a heavy crown with four rounded points in the center (C1), and a small bifurcate tooth just to right of center (C2). A. tonsa successfully extracted silicic acid from concentrations in seawater. Formation of normal teeth required concentration of 0.8 microMol or above. Copepodites and adults formed teeth at all of the silicic acid levels tested. However, typical specimens from low silicic-acid levels had teeth much lower in relief than those from high silicic-acid levels. This reduction was most evident in specimens from the 0.18 to 0.3 microMol concentrations. Reduction of teeth in specimens reared at low levels was variable both among individuals and among teeth on the same mandible. In a number of cases the ventral tooth was so reduced that in the SEM there appeared to be a hole completely through the siliceous structure to the chitin or tissue underneath (see Figure 2).

Species Acartia (Acanthacartia) tonsa - Plate 19 of morphological figuresissued from : C.B. Miller, D.M. Nelson, R.L. Guillard & B.I. Woodward in Biol. Bull., 1980, 159 [p.356, Fig.2]. SEM by A. Cornell-Bellbr.
Female: (Left figure) mandibular gnathobase of adult (reared at 0.22 microMol. silicic acid. The reduced ventral tooth is on the lower right. (Right figure) Detail of same jaw shows the character of the apparent hole in the ventral tooth.
The black bar represents 2.5 microns.

Species Acartia (Acanthacartia) tonsa - Plate 20 of morphological figuresissued from : C.B. Miller, D.M. Nelson, R.L. Guillard & B.I. Woodward in Biol. Bull., 1980, 159 [p.357, Fig.3]. SEM by A.H. Soeldner.
Female: Mandibular gnathobase of adult reared at 0.27 microMol. silicic acid. The central tooth shows severe reduction (the ventral tooth is at left).
The black bar represents 5 micons.

Species Acartia (Acanthacartia) tonsa - Plate 21 of morphological figuresissued from : C.B. Miller, D.M. Nelson, R.L. Guillard & B.I. Woodward in Biol. Bull., 1980, 159 [p.358, Fig.4]. SEM by A.H. Soeldner.
Female: (Above) Mandibular gnathobase from adult reared at 0.21 microMol. silicic acic. Both teeth show substantial, but not severe reduction. The ventral tooth is io the right. (Below) detail of central tooth shows the proximal-to-distal grooves usually on the surfaces of the teeth.
The black bar represents 2.5 microns.

Species Acartia (Acanthacartia) tonsa - Plate 22 of morphological figuresissued from : C.B. Miller, D.M. Nelson, R.L. Guillard & B.I. Woodward in Biol. Bull., 1980, 159 [p.360, Fig.5]. SEM by A.H. Soeldner.
Stage V: (Above) Mandibular gnathobase from copepodite reared at 0.21 microMol silicic acid. Both V and C1 show extreme reduction. (Below) Mandibular gnathobase from another copepodite reared at 0.21 microMol silicic acid. Neither V or C1 shows much wear.
The black bars represents 5 microns.
Nota: There is substantial reduction in one specimen, but not in other. Both the reduction and its variability occur in the younger stages as well as in adults.

Species Acartia (Acanthacartia) tonsa - Plate 23 of morphological figuresissued from : D.F.R. Arcos in Gayana, Zool., 1975, 32. [Lam.IX, Figs.71-74].
Female (from Bahia de Concepcion, Chile): 73, habitus (dorsal); 74, P5.

Male: 71, habitus (dorsal); 72, P5.

Species Acartia (Acanthacartia) tonsa - Plate 24 of morphological figuresissued from : R.-M. Bathélémy in J. Mar. Biol. Ass. U.K., 1999, 79. [p.861, Fig.4, K, L].
Scanning electon miccrograph. Female: K, genital double-somite (ventral); L, detail of the right genital slit.
Scale bars: 0.030 mm (K); 0.005 mm (L).
Symbols: * = cuticular protuberance; arrowhead = lamellar flap; small arrow = genital slit.

Species Acartia (Acanthacartia) tonsa - Plate 25 of morphological figuresissued from : G. Harding in Key to the adullt pelagic calanoid copepods found over the continental shelf of the Canadian Atlantic coast. Bedford Inst. Oceanogr., Dartmouth, Nova Scotia, 2004. [p.24].
Female & Male.

Nota: Female P5 basis with round process, apical segment not evenly tapered, toothed at center (arrowed).
Male left P5 apical segment with two digitiform appendages; right penultimate segment with no spines on process (arrowed)

Species Acartia (Acanthacartia) tonsa - Plate 26 of morphological figuresissued from : T.K.S. Björnberg in Bol. Inst. Oceanogr. Sao Paulo, 1963, XIII, 1. [p.65, Fig.34]. As Acartia tonsa var. cryophylla.
Female (from S Brazil): a, forehead; b, habitus (dorsal); c, last thoracic segment and urosome with spermatophore (right lateral); e, P5.

Male: d, last thoracic segment and urosome (dorsal); f, P5.

Nota: The abdomen of the female shows no spinulation along the margin of the abdominal segments; The P5 female have a longer marginal seta on the basal segment than the typical A. tonsa. The specimen is an indicator of cold southern water, therefore the name of the Brazilian new variety cryophylla (Salinity: 25.48-33.22 p.1000; temperatures: 14.38-15.40°C)

Species Acartia (Acanthacartia) tonsa - Plate 27 of morphological figures Ma. E. Zamora-Sanchez & S. Gomez-Aguirre in An. Inst. Univ. Nal. Auton. Mexico, 56 (1985), Ser. Zool. (2), 1986. [Pl.3, p.344].
Female (from Laguna de Agiabampo, Golf of California): 33, habitus (dorsal); 34, last thoracic segment and urosome (dorsal); 35, last thoracic segment and genital segment (lateral); 36, P5 (dorsal view).

Male: 37, habitus (dorsal); 38, last thoracic segment and urosome (dorsal); 39, last thoracic segment and urosomal segments 1-4 (lateral); 40, P5.

Species Acartia (Acanthacartia) tonsa - Plate 28 of morphological figuresissued from : J.K. Dawson in Harbors Environmental Projects, Univ. Southern California, 1979. [p.9, Fig.3].
Female (from Los Angeles Harbors): P5.

Species Acartia (Acanthacartia) tonsa - Plate 29 of morphological figuresissued from : J.K. Dawson in Harbors Environmental Projects, Univ. Southern California, 1979. [p.7, Fig.1].
Male: P5.

Species Acartia (Acanthacartia) tonsa - Plate 30 of morphological figuresissued from : J.K. Dawson in Harbors Environmental Projects, Univ. Southern California, 1979. [p.15, Fig.9, B, D].
Female : D, urosome (dorsal).

Male: B, urosome (dorsal).

Species Acartia (Acanthacartia) tonsa - Plate 31 of morphological figuresissued from : B.W. Hansen, G. Drillet, M.F. Pedersen, K.P. Sjøgreen & B. Vismann in J. comp. Physiol. B, 182. [p.616, Fig.1].
Subitaneous eggs of Acartia tonsa exposed to abrupt and substantial changes in salinity.
The eggs were transferred from normal salinity (32 psu) to 0 or 72 psu.
At zero salinity : A vitelline coat and chorion shell; B perivitelline space; C egg plasma membrane and D embryo.

Nota: When eggs kept at salinity 32 psu were abruptly exposed to hypo-saline conditions (0 psu), they swelled from about 80-90 micrometers in diameter, but they never exploded and they never hatched. Exposure of eggs to small, gradual changes in salinity was followed by changes in egg diameter and volume. The eggs exposed to 60 and 70 psu seawater imploded within 10 min whereas eggs exposed to 50 psu imploded after approximately 6 h.

After C.R, trancription from conductivity (psu) to ClNa: psu valor x 0.58; and conductivity to total salts: psu x 0.65.

Species Acartia (Acanthacartia) tonsa - Plate 32 of morphological figuresissued from : R.P. Hassett & P. Blades-Eckelbarger in Mar. Biol., 1995, 124. [p.60, Fig.1 partial]
Acartia tonsa (from Long Island Sound, New York). a, digestive system (drawn from digitized sagittal section) showing location of B-cells (arrowed). 1-3 midgut zones following terminology of Arnaud & al., 1978, e : aesophage; b-c, side and dorsal views, respectively, of adult female using differential interference contrast light microscopy, showing outline of gut epithelial layer and location of B-cells (arrowed)

Species Acartia (Acanthacartia) tonsa - Plate 33 of morphological figuresissued from : M. Anraku & M. Omori in Limnol. Oceanogr., 1963, 8. [p.122, Fig. 7, F]
Acartia tonsa (from Woods Hole): Cutting edge of Md.

Nota: The species has teeth of a somewhat different shape; some are sharp, others rounded.

Species Acartia (Acanthacartia) tonsa - Plate 34 of morphological figuresIssued from : J.M. Bradford-Grieve in ICES Identification Leaflets for Plankton N°181, 1999 [p.11, Figs.14 a-f].
Female: a, forehead (ventral) with rostral filaments; b, urosome (dorsal); c, P5.

Male: d, urosome (dorsal); e, P5; f, exopodal segments 2+3 of left P5.

Compl. Ref.:
Esterly, 1917 (p.393, light-dark reactions); 1919 (p.1, 16, light-dark reactions); Sewell, 1948 (p.392, 461); Conover, 1956 (p.156, biology); Grice, 1956 (p.50); Deevey, 1956 (p.126, 127, tab. IV); Conover, 1959 (p.259, Table 1, 2, respiration); Deevey, 1960 (p.5, Table II, fig.8, 13, 14: annual abundance, Rem.: p.25, fig.18, 19) ; Bowman, 1961 (p.206, Rem.); H. Schulz, 1961 (p.57); Wickstead, 1962 (p.546, food & feeding); Marshall & Orr, 1962 (tab.1, 3); Fagetti, 1962 (p.37); Ahlstrom & Thrailkill, 1963 (p.57, Table 5, abundance); Gaudy, 1963 (p.29, Rem.); Anraku, 1964 a (p.221, grazing, predation); 1964 b (p.195, respiration-grazing v.s. temperature); Lance, 1965 (p.155, Table 1, 2, respiration v.s. osmotic pressure); Martin, 1965 (p.185, 188: Table 1); Faber, 1966 a (p.418, 419); Fleminger, 1967 a (tabl.1); Bishop, 1967 (p.23, predators); Hargrave & Geen, 1968 (p.332, phosphorus excretion); Emery, 1968 (p.293, swarm); Vinogradov, 1968 (1970) (p.106); Mullin, 1969 (p.308, Table I: estimates of production); Heinle, 1969 (p.186, temperature effect); 1969 a (p.150, Table 1, culture); 1970 (p.360, population dynamics); Itoh, 1970 a (p.8: tab.2); Reeve, 1970 (p.894, Rem.: p.901); Reeve & Cosper, 1970 (p.1, temperature effect); Wilson D.F. & Parrish, 1971 (p.202, mating); Zillioux & Gonzalez, 1972 (p.217, egg dormancy); Björnberg, 1973 (p.354, 384); Heinrich, 1973 (p.95, fig.1); Arndt & Heidecke, 1973 (p.599, 603); Mullin & Evans, 1974 (p.902, efficieny in food chain); Wilson D.S., 1974 (p.909, food size selection); Arashkevich, 1975 (p.351, fig.2, digestion time); Anderson G., 1975 (p.747, parasited by epidarid isopod); Peterson & Miller, 1975 (p.642, 650, Table 3, interannual abundance); 1976 (p.14, Table 1, 2, 3, abundance vs interannual variations); Uye & Fleminger, 1976 (p.253, resting egg, hatching); Arcos, 1976 (p.85, Rem.: p.97); Roman, 1977 (p.149, feeding); Peterson & Miller, 1977 (p.717, Table 1, seasonal occurrence); Miller & al., 1977 (p.326, growth); Ikeda, 1977 b (p.29, respiration rate); Richman & al., 1977 (p.69, grazing); Reeve & Walter, 1977 (p.211, grazing vs. food concentrations); Allan & al., 1977 (p.317, grazing); Honjo & Roman, 1978 (p.45, fecal pellet, sinking rate); Parrish & Wilson, 1978 (p.65, fecundity); Lee & McAlice, 1979 (p.228, annual cycle); Lonsdale & al., 1979 (p.235, carnivorous behavior); McAlice, 1981 (p.267); Grice & Marcus, 1981 (p.125, Dormant eggs, Rem.: p.130, 135, 136); Cahoon, 1981 (p.1215, reproductive rate vs. food quality); Arashkevich & al., 1982 (p.477, Table 2, diet); Citarella, 1982 (p.791, 798: listing, frequency, fig.5, Tableau II, V); Turner & Dagg, 1983 (p.16); Landry, 1983 (p.614, development times vs. stages); Durbin & al., 1983 (p.1199, size-weight, Chl a, egg production); ); Roman, 1984 (p.949, feeding); Stearns & Forward, 1984 (p.85, photosensiivity); 1984 a (p.91, photobehavior); Turner, 1984 b (p.265, Table 1, fig.3-7: pellet contents); Tremblay & Anderson, 1984 (p.3); Peterson, 1985 (p.726, fig.2, abundance); Donaghay, 1985 (p.235, food quality, egg production); Stoecker & Sanders, 1985 (p.85, grazing); Tester, 1985 (p.45, egg-hatching); Baars & Oosterhuis, 1985 (p.71, Table 4: gut passage time); Ambler, 1985 (p.743, egg production); 1986 (p.183, egg production); Stearns, 1986 (p.65, grazing behavior); Sullivan & McManus, 1986 (p.121, egg production); Beckman & Peterson, 1986 (p.917, egg production); Stoecker & Egloff, 1987 (p.53, feeding); Stearns & al., 1987 (p.305, grazing); Libourel Houde & Roman, 1987 (p.69, food quality/ingestion); Kiørboe & Tiselius, 1987 (p.525, gut clearance); Johansen & Møhlenberg, 1987 (p.137, toxicity/egg production); Bellantoni & Peterson, 1987 (p.199, egg production); Jimenez-Perez & Lara-Lara, 1988 (p.122); Kleppel & al., 1988 (p.185, gut contents); Paffenhöfer & Stearns, 1988 (p.33, clearance rate); Dagg, 1988 (p.167, egg production vs. physical event); Donaghay, 1988 (p.469, acclimatation vs. food quality & trophic dominance); Berggreen & al., 1988 (p.341, feeding, production); Daan & al., 1988 (p.45, Table 4, carnivorous behaviour); Turner & Tester, 1989 (p.21, grazing); Tester & Turner, 1989 (p.231, feeding rate); Verity & Smayda, 1989 (p.161, ingestion-egg production); White & Dagg, 1989 (p.315, egg production vs. suspended sediment); Citarella, 1989 (p.123, abundance); Stearns & al., 1989 (p.7, egg production); Cervantes-Duarte & Hernandez-Trujillo, 1989 (tab.3); Sabatini, 1989 (p.847, annual cycle); Marcus, 1990 (p.413, tab.1, fig.2: egg); Støttrup & Jensen, 1990 (p.87, feeding, egg production); Tester & Turner, 1990 (p.169, Fig.4); Stoecker & McDowell Capuzzo, 1990 (p.891, feeding); Durbin & al., 1990 (p.23, diel feeding behavior); Mallin, 1991 (p.481); Haigh & Taylor, 1991 (p.301, Rem.: p.309); Fransz & al., 1991 (p.10); Gifford, 1991 (p.8, Table 2, diet); Gifford & Dagg, 1991 (p.161, feeding); Fernandez Araoz, 1991 (p.575); Tester & Turner, 1991 (p.603); Lee B.-G & Fisher, 1992 (p.117, fecal pellets); Huntley & Lopez, 1992 (p.201, Table 1, A1, B1, eggs, egg-adult weight, temperature-dependent production, growth rate); Hirche, 1992 (p.395, Table 1, egg production, r-strategy); Durbin & al., 1992 (p.342, Table 5, size-weight, egg production); Kleppel, 1992 (p.57, feeding); Arfi & al., 1992 (p.213, filtration rate); Kimmerer, 1993 (tab.2); Roman & al., 1993 (p.1603, Oxygen effect); Saiz & al., 1993 (p.280, predation effect); Cervetto & al., 1993 (p.1207, feeding, respiration, egg production); Snell & Carmona, 1994 (p.255); Lutz & al., 1994 (p.119, hatching/O2 effect); Jonasdottir, 1994 (p.67, nutrition); Belmonte & al., 1994 (p.9); Miller & Marcus, 1994 (p.235, sinking velocity eggs); Wieser, 1994 (p.1, Rem.: p.18, fig.4A); Hoffmeyer, 1994 (p.303); Suarez Morales, 1994 b (tab.1); Butler & Dam, 1994 (p.81, production rates fecal pellets); Saiz & Kiørboe, 1995 (p;147, feeding modes and turbulence effect); de Angelis & Lee, 1994 (p.1298, methane production); Hajderi, 1995 (p.542); Santos & Ramirez, 1995 (p.133, Tabl. I, fig.2, 3); Marcus, 1996 (p.143); Hansen B. & Bech, 1996 (p.257, bacteria associated); hansen B. & al., 1996 (p.275, degradation fecal pellets); Tiselius & Jonsson, 1997 (p.164, predation); Mauchline, 1998 (tab.15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 33, 35, 36, 38, 40, 45, 46, 47, 48, 51, 53, 54, 56, 58, 62, 63, 64, 66, 68, 69, 78, fig.66); Lopes & al., 1998 (p.195); Alvarez-Cadena & al., 1998 (tab.2, 3); Hopcroft & al., 1998 (tab.2); Suarez-Morales & Gasca, 1998 a. (p107); Lavaniegos & Gonzalez-Navarro, 1999 (p.239, Appx.1); Cervetto & al., 1999 (p.33); Onishchik, 1999 (p.76); Harvey & al., 1999 (p.1, 49: Appendix 5, in ballast water vessel); Støttrup & al., 1999 (p.257, development, lipids); Escribano & Hidalgo, 2000 (p.283, tab.2); Gaudy & al., 2000 (p.51); Camatti & al., 2000 (p.41); Alvarez-Silva & Gomez-Aguirre, 2000 (p.163: tab.2); Gubanova, 2000 (p.105, introduction); Tester & al., 2000 (p.418, toxicity); Hidalgo & Escribano, 2001 (p.159, tab.2); Hidalgo & Escribano, 2001 (p.157, fig.4); Fransz & Gonzalez, 2001 (p.255, tab.1); Belmonte & Potenza, 2001 (p.174, 175: Rem.); Ara, 2001 b (p.121); Peterson & al. (p.381, Table 2, interannual abundance); Bressan & Moro, 2002 (tab.2); Uysal & al., 2002 (p.17, tab.1); Viñas & al., 2002 (p.1031); Besiktepe & Dam, 2002 (p.151, ingestion & defecation vs. diet); Dunbar & Webber, 2003 (tab.1); Zagorodnyaya & al., 2003 (p.52); Gubanova, 2003 (p.94, 99); Peterson & Keister, 2003 (p.2499, interannual variability); Vieira & al., 2003 (p.S163, Table 2, abundance); Titelman & Kiørboe, 2003 a (p.137, nauplius behaviour); Krumme & Liang, 2004 (p.407, tab.1); Ara, 2004 (p.179, figs. 3, 4, 5); Marrari & al., 2004 (p.667, tab.1); Vargas & Gonzalez, 2004 (p.151); Gaudy & Verriopoulos, 2004 (p.219): Gubanova, 2005 (p.146); Alvarez-Silva & al., 2005 (p.39); Choi & al., 2005 (p.710: Tab.III); David & al., 2005 (p.171); Berasategui & al., 2005 (p.485, tab.1); Manning & Bucklin, 2005 (p.233, Table 1); Bagøien & Kiorboe, 2005 a (p.129, mating); Berasategui & al., 2006 (p.485: fig.2); Marques & al., 2006 (p.297, tab.III) ; Roman & al., 2006 (p.435, nutrition); Sei & al., 2006 (p.121, feeding , eggs viabiliity vs oxygenation); Escribano, 2006 (p.20, Table 1); Hooff & Peterson 2006 (p.2610); Papastephanou & al., 2006 (p.3078, Table 3); Selifonova, 2006 (p.117); Drillet & al., 2006 (p.714, egg storage); Holste & Peck, 2006 (p.1061, egg production vs temperature & salinity); Sørensen & al., 2007 (p.84, Rem.: eggs); David & al., 2007 (p.59: tab.2); Woodson & al., 2007 (p.163: Rem; behavior); Speekmann & al., 2007 (p.759); Pedroso & al., 2007 (p.173, silver toxicity); S.C. Marques & al., 2007 (p.213, Table 1, fig.6); Chojnacki & al., 2007 (p.45, Table 2); Biancalana & al., 2007 (p.83, Tab.2, 3); Sullivan & al., 2007 (p.259, Rem.: climate change); Leandro & al., 2007 (p.215); Pinho & al., 2007 (p.62); Youn & Choi, 2007 (p.222: Table1, egg production); Castro & al., 2007 (p.486, fig.3, Table 1, 2, 3); David & al., 2007 a (p.429, figs.2, 4, 5, 6, Table 3, 4, 5, 6); Marques S.C. & al., 2007 (p.725, Table 1, fig.4, climate variability); Titelman & al., 1023, Table I, Rem: mating); Drillet & al., 2008 (p.109, genetic analysis, eggs); Sullivan & al., 2008 (p.485); Chen & Hare, 2008 (p.1451, molecular biology, cryptic ecological diversification); Smith J.R. & al., 2008 (p.937, Rem.: feeding behavior); Ayon & al., 2008 (p.238, Table 4: Peruvian samples); Peck & al., 2008 (p.102, egg production); Shmeleva & al., 2008 (p.31, Table 1); Waggett & Buskey, 2008 (p.111, Table 1); Muelbert & al., 2008 (p.1662, Table 1); Calliari & al., 2008 (p.18, salinity effecs); Hubareva & al., 2008 (p.131, Table 1, 2); Saco-Alvarez & al., 2008 (p.275, Table 1, toxicity from fuel tanker); Drillet & al., 2008 (p.47, rearing); Larsen & al., 2008 (p.47, fig.1, Table 1, swimming-temperature-viscosity); Galbraith, 2009 (pers. comm.); Calliari & al., 2009 (p.1045, grazing, egg production rates); Brylinski, 2009 (p.253: Tab.1, p.256: Rem.); Ohs & al., 2009 (p.114, Rem.: eggs); Tartarotti & Torres, 2009 (p.106, UV effects); Kozlowsky-Suzuki & al., 2009 (p.395, Table 2, nutrition, oocyte development); Aravena & al., 2009 (p.621, seasonal & spatial distribution v.s. environmental factors); Telesh & al., 2009 (p.18: Table 2.1); Magalhaes & al., 2009 (p.187, Table 1, %); Escribano & al., 2009 (p.1083, Table 1, figs.6, 10); Primo & al., 2009 (p.341, Table1, interannual variations); Hansen B.W. & al., 2010 (p.305 (egg hatching); C.E. Morales & al., 2010 (p.158, Table 1); Escribano & Pérez, 2010 (p.301, Fig.4: fatty acids); Hernandez-Trujillo & al., 2010 (p.913, Table 2); Hidalgo & al., 2010 (p.2089, Table 2, Fig.2); Zenetos & al., 2010 (p.397); Mazzocchi & Di Capua, 2010 (p.423); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2); S.C. Marques & al., 2011 (p.59, Table 1, seasonal variability); Hogfors & al., 2011 (p.1460, fig.1, egg production); Bollens & al., 2011 (p.1358, Table III); Magris & al., 2011 (p.260, abundance, interannual variability); Amin & al., 1965, clearance, feeding, egg production vs diets); Postel, 2012 (p.327, Table 1, Fig.6); Delpy & al., 2012 (p.1921, Table 2); Hansen B.W & al., 2012 (p.613, eggs/salinity); Stefanova & al., 2012 (p.403, Table 2, interannual abundance); Olivotto & al., 2012 (p.685, egg production, molecular analysis); Guenther & al., 2012 (p.405, 411); Menéndez & al., 2012 (p.11, variability vs physical processes); Borg & al., 2012 (p.1, Nauplii swimming); Bruno & al., 2012 (p.1, Nauplii behaviour); Gorbi & al., 2012 (p.2023, test of toxicity vs eggs, nauplii); Malzahn & Boersma, 2012 (p.1408, feeding vs growth); Hong J. & al., 2012 (p.1, feeding behavior vs algal toxins); Drillet & al., 2012 (p.155, Table 1, culture); Kimmel & al., 2012 (p.76, long-term abundance record vs eutrophication); Gusmao & al., 2013 (p.279, Table 4, sex ratio); Gubanova & al., 2013 (in press, Rem.: p.5, Table 4, fig.2, alien species); Palomares-Garcia & al., 2013 (p.1009, Table I, abundance vs environmental factors); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, pers. comm.); Gissi & al., 2013 (p.86, Table 3, copper toxicity); Chaalali & al., 2013 (p.1, abundance change vs. environmental conditions during the period 1992-2010); Elliott & al., 2013 (p.1027, low-oxygen effects); Elliott & al., 2013 a (p.1, hypoxia effects); Finiguerra & al., 2013 (p.17, sex tolerance vs. starvation); Garbosa da Costa & al., 2013 (p.756, Table 1, abundance vs tide); Zhang J. & al., 2013 (p.65, diets vs egg production, hatching success); Heuschele & al., 2013 (p.399, Table 2, mate behavior); Jarvis & al., 2013 (p.1264, Zinc oxide effects vs survival, production); Peijnenburg & Goetze, 2013 (p.2765, genetic data); Hansen B.W. & Drillet, 2013 (p.66, oxygen consumption, subitaneous and delayed hatching eggs); Fernandez-Severini & al., 2013 (p.1495, heavy metals concentrations); Alvarez-Silva & Torres-Alvarado, 2013 (p.241, Table1: seasonal abundance); Dunlap & al., 2013 (p.1375, mortality vs viral infestion); Mendoza Portillo, 2013 (p.37: Fig.7, seasonal dominance); Lidvanov & al., 2013 (p.290, Table 2, % composition)
NZ: 15

Distribution map of Acartia (Acanthacartia) tonsa by geographical zones
Species Acartia (Acanthacartia) tonsa - Distribution map 4
Chart of 1996
Species Acartia (Acanthacartia) tonsa - Distribution map 5issued from : P. Remy in Annales de Biologie Lacustre, 1926 (1927 a), XV. [p.179]: geographic distribution in 1926.
1 : Port-Jackson (Australia) catches by Dana in 1840. 2 to 7: Pacific coast from South America (Valparaiso to Coquimbo and Arica, Chile; Mollendo and Callao, Peru) by Giesbrecht (1892). 8 and 9: Pacific coast from North America (San Diego region) by Esterly, 1905, 1923. 10: Bay of San Francisco by Esterly, 1924. 11: Sub-Antarct (Falkland Is.) by T. Scott, 1914. 12: Northwestern Atlantic (Mouth of Orenoque) by Cleve, 1900. 13, coast of Louisiane by Foster, 1904; 14-18:: Jamaica Bay near New York and along the coast until the bay of Fundy, by Sharpe (1910), Wheeler (1900), Williams (1906, 1907), Steuer (1923). 19-20: In the Indian Ocean (Mouth of Indus by Cleve, 1904; Maldive islands by Wolfenden, 1905. In Sunda Islands by, Cleve, 1901. In France (Channel of Caen-Ouistreham harbour)
Species Acartia (Acanthacartia) tonsa - Distribution map 6issued from : J.M. Brylinski in J. Plankton Res., 1981, 3 (2). [p.256, Fig.1].
Geographical distribution of Acartia tonsa in northern European waters.
Species Acartia (Acanthacartia) tonsa - Distribution map 7issued from : M.E. Sabatini in Scient. Mar., 1989, 53 (4). [p.855, Tabl.2].
Seasonal occurrence, number and duration of Acartia tonsa generations in different areas.
Locality; Latitude; temperature range (°C) ; seasonal occurrence; number of generations (cohorts); generation time (in weeks); author reference.
Species Acartia (Acanthacartia) tonsa - Distribution map 8issued from : G.B. Deevey in Bull. Bingham Oceanogr. Coll., 1960 (2). [p.27, Fig.14].
Variations in length of Acartia tonsa females and males in the Delaware Bay (NW Atlantic Ocean).
Species Acartia (Acanthacartia) tonsa - Distribution map 9issued from : J.T. Turner in P. S. Z. N. I: Mar. Ecol., 1984, 5 (3). [p.273, Fig.5].
Contents of fecal pellets from Acartia tonsa females from Station A-2 (off Mississipi Eiver mouth) on 9 December 1981.
a and b: small unidentified centric diatom (arrow); c: fragments of Skeletonema costatum (S) and an uniddentified centric diatom (UC); d: fragments of an unidentified diatom; e: Chaetoceros sp. spine (C) and fragments of a crustacean exoskeleton (CE), note dagger-like spines which appear to be chemoreceptors; f: crustacean appendages (CA) underneath the pellet peritrophic membrane (PM).
Species Acartia (Acanthacartia) tonsa - Distribution map 10issued from : M.R. Reeve in Bull. mar. Sc., 1970, 20 (4). [p.902, Fig.4].
Temperature-salinity diagram for Acartia tonsa in Biscayne Bay (Florida, Miami).
Species Acartia (Acanthacartia) tonsa - Distribution map 11issued from : B. Hansen, F.L. Fotel, N.J. Jensen & S.D. Madsen in J. Plankton Res., 1996, 18 (2). [p.284, Fig.6, p.285, Fig.6 continued].
Video prints of the degradation of fecal pellets incubated in 0.22 micrometer filtered seawater as a function of time. The fecal pellets were produced on the nanoflagellate Rhodomonas baltica at excess food by the copepod Acartia tonsa.
The light intensity and video camera shutter speed were kept equal at all readings to make direct comparison possible. Scale bar = 0.100 mm.

Nota: Degradation of freshly produced fecal pellets in suspension was followed over time by volume recording and estimation of carbon loss.
The fecal pellets produced on a diatom diet were very dense and showed a significantly slower degradation than those produced on nanoflagellate or dinoflagellate diets. This indicates that the algal texture (i.e. the mechanical robustness given by inert structures) determines the degradation rate of the pellets.
The degradation rate was also very dependent on the algal concentration for the grazer (565 microgg. C per day T 1/2 = 75 h; excess food T 1/2 = 12 h).
Disintegration and degradation are processes of bacterial activity and mechanical stress in combination while the fecal pellets are in a suspension with no predators (see Jacobsen & Azam, 1984). Fecal pellets, in situ, however, are presumably exposed to coprophagy and coprorhexy from mesozooplankton (see Noji & al., 1991). The authors found a faster degradation while ciliates (Euplotes sp.) were accidentally contaminants in an incubation vial.
Free-living bacteria colonized the fecal pellets. After initiating colonization, the bacteria penetrated the peritrophic membrane, wich clearly leaked out material, observed as fecal pellets losing color (fig.6). Then the bacteria began the degradation of the fecal pellet matrix (Noji & al., 1991; Gonzalez, 1992). This scenario was already suggested by Gowing & Silver (1983) and Dellile & Razouls (1994) who stated that fecal pellets generally contain abundant internal bacteria.
During the degradation of the diatom-based pellets, the authors frequently observed coprochaly, where the matrix of the pellets swells, with the content of labile carbon disappearing. This was, however, never observed in the present nanoflagellate and dinoflagellate experiments.
Corner & O'Hara (1986, p.303) underline that after Sochard & al. (1979) studying microorganisms in Acartia tonsa found a unique gut flora dominated by numerous species of the genus Vibrio, and Gowing & Silver (1983) found that the mean volumes of bacteria inside such pellets were greater than those on their surface, a condition still prevailing after these pellets had been aged for over five days in sea water. Honjo & Roman (1978) could detect no bacteria in the faecal pellets released by copepods fed on bacteria-free diets.
Species Acartia (Acanthacartia) tonsa - Distribution map 12issued from : M.M. Mullin & P.M. Evans in Limnol. Oceanogr., 1974, 19 (6). [p.907, Fig.2].
Biomasses (bodily carbon) of various components integrated over the water column in the deep tank (cylinder 10 m deep and 3 m in diameter, about 70 m3 of sea water [from the Scripps Institution, La Jolla, San Diego], fiiltered through fine diatomaceous earth; to darken during the experiment.
Arrows on the ababsissa indicate the start and end phases of the experiment. The dashed line under ''copepods'' indicates the biomasses of Acartia tonsa and Paracalanus parvus during the transition period.

Nota: Establishment of a linear food chain consisting of the chain-forming diatom Skeletonema costatum, the copepods A. tonsa and P. parvus (particle-grazing), and ultimately the ctenophore Pleurobrachia bachei (coastal carnivore).
The experiment was divided into three phases; during the first two phases only copepods were present, A. tonsa initially dominating but subsequently being replaced by P. parvus (phase II). Phase III was that portion of the experiment when ctenophores were present together with P. parvus.
Assuming that the C:Chl ratio was maintened in the deep tank, the contribution of phytoplankton to the total particulate carbon (fig.2) can be calculated. The median level of the remaining, presumably detrital, particulate carbon was 140 mg/m3 (similar to the concentration of detritus in the near surface waters off La Jolla).
During phase I, when Acartia was dominant, the biomass of copepods fluctuated considerably and then declined until Paracalanus became dominant, thus starting phase II. It appear that Paracalanus has a higher rate of turnover than does Acartia but uses its food supply less effectively, resulting in a slightly lower food chain efficiency.
The median biomass of ctenophores in the tank was 16% that of the copepods during phase III (fig.2) and the biomass of copepods was similar to the local biomass of prey species for Pleurobrachia in spring, summer and fall (see Hirota, 1974: Table 10).
The field study of a marine planktonic food chain with which the experiment's results can be most directly compared is that of Petipa & al. (1970) in the Black Sea.
Species Acartia (Acanthacartia) tonsa - Distribution map 13Issued from : R.J. Conover in Bull. Bingham Oceanogr. Coll., 1956, XV. [p.181, Fig.13].
Size distribution of adult females Acartia tonsa from Long Island Sound ( U.S.A.) at different times of the year, 1952-1953.
Species Acartia (Acanthacartia) tonsa - Distribution map 14Issued from : R.J. Conover in Bull. Bingham Oceanogr. Coll., 1956, XV. [p.176, Fig.11, C].
Seasonal distribution in percent of total organisms of adults and naupliiAcartia tonsa from Long Island Sound, U.S.A.) 1952-1953.
The number of generations was estimated from the distribution of nauplii and adults.
The nauplii of each generation are designated by Roman numerals and the corresponding adults in Arabic;

Nota: There were probably 4 generations annually in the Sound, produced in the period from June through March. The development ofhe first two generations is clear enough; however, on September 23, a secondary peak of adults appeared which must have produced some of nauplii III. After mid-October, the percentage of A. tonsa in the tows increased while totals of all species were decreasing, suggesting that tonsa was more resistant to fall and winter conditions than other summer zooplankton forms..
In any event, adult peak 3 appears to be significant. The designation IV applies to low levels of nauplii produced through the cooler months. Possibly a few of the early IV nauplii matured so as to produce an overwintering population which consisted of both adults 3 and 4
Falkland Is., Ushuaia, Magellan Strait, Magallanes region, Patagonia, Peninsula Valdés, Mar del Plata, Argentina (Bahia Blanca estuary), Uruguay (Laguna de Rocha, continental shelf), off Rio de la Plata, Brazil (., Guanabara Bay, Mucuri estuary, Saco de Mangueira, Lagoa dos Patos Cananeia Lagoon, Curuça estuary, Amazon estuary, off Amazon), Guyana (Kourou), off Angola, Congo, G. of Guinea (Liberia, Ghana), Morocco-Mauritania, Caribbean Colombia, Caribbean Sea (Yucatan), G. of Mexico, Turkey Point, off Timbalier Island, Mississipi (off Southwest Pass), Mississipi River (plume), Jamaica, Porto-Rico, Savannah River Estuary, Florida, Bayboro Harbor, Wassaw Sound, off Bermuda, Miami, Patuxent River estuary, Avery Point, off Maryland, Wilmington River estuary, Newport River estuary, Patuxent River, Beaufort (Inlet, Gallants Channel), Chesapeake Bay, Delaware Bay, Long Island Sound, Narragansett Bay, Great Bay, New York, Long Island, off Woods Hole, Damariscotta esuary, Perch Pond, Buzzards Bay, Cap Cod, Nova Scotia, Bras d'Or Lake, Morrison's Pond, Shédiac Bay, Northumberland Strait, G. of St. Lawrence, North Sea, Baltic Sea, Gulf of Mecklenburger, Bay of Kiel, Schlei Fjord, Elbe (estuary), Dunkerque Harbour, English Channel, Southampton, Bay of Biscay (Arcachon), Gironde Estuary, Bilbao estuary, Portugal (Ria de Aveiro, Mondego estuary), Medit. (Berre Lagoon, Livorno, NW Adriatic Sea: Po estuary, Lagoon of Venezzia, Koper Harbour, Lebanon Basin, Marmara Sea, Black Sea, Sevastopol Bay, Azov Sea), Caspian Sea, Indian (Maldive Is.), Indonesia-Malaysia, Caroline Is., Vancouver Is., Oregon (Yaquina, off Newport), San Francisco (Bay and Estuary), Los Angeles (San Pedro Bay), San Diego (Bay), off La Jolla, W Baja California (Bahia Magdalena), G. of California (N & Centre, lagoon Agiabampo: Sonora, Coyuca lagoon: Guerrero), W Mexico, E Australia, Pacif. S (NPFZ), off Peruvian coast, Chile ( N, Mejillones Bay, Valparaiso)
N: 368
(16) F: 1,12-0,9; (36) F: 1,27-1,1; M: 1,12-0,98; (46) F: 1,5-1,3; M: 1,05; (142) F: 1,5-1,2; M: 1,1-1; (145) F: 1,4; M: 1,34; (179) F: 0,97-0,87; M: 0,8-0,77; (187) F: 1,4-1,12; M: 1,14-1,03; (188) F: 1,5-1,3; M: 1,05; (237) F: 1,25; M: 1,0; (237 as giesbrechti*) F: 1,0; (253) F: 0,98-0,821; M: 0,84-0,786 [Black Sea]; F: 1,15-1,029; M: 1-0,91 [S Adriatic Sea]; (817) F: 1,25; M: 1,09; (254) F: ±1,25; M: ±1; (861) F: 1,44-1,46; M: 1,21-1,23; (1125) F: 1,0-1,2; {F: 0,821-1,50; M: 0,77-1,34}
Rem.: coastal, ± brackish.
Remy, 1927 a (p.177 & further) has analysed the geographic distribution of this species from its description in the Bay of Port-Jackson (Australia). He deduces that localizations, notably alongside European coasts, may be due to ship's transport. Recently, Carlton & Geller (1993, p.78) and Mauchline (1998, p.505 ) give some examples.
After Arcos (1976) the species is present in the Magallanica region with a range of temperature 5.05°C to 5.78°C and salinity 30.40 to 30.58 p.1000.
Zillioux & Gonzalez (1972) were the first to report the presence of "dormant eggs" of pelagic copepods in marine sediments.
The female P5 may show anomalies (see Behrends et al., 1997).
According to Bowman (1965, p.150) environmental conditions may affect the development of the rostral filaments (Fleminger informs that he has noticed that the rostral filaments are weak and often difficult to see in specimens of A. tonsa from coastal waters of the Gulf of Mexico where salinities are near the lower limits of tolerance); It is possible that A. floridana Davis (1948), which closely resembles A. tonsa but lacks rostral filaments, is an ecophenotype of A. tonsa.
According to Brylinski (2009, p.256) this species develops in warm and brackish waters (as harbour) and was never recorded in the Strait of Dover.

After Saiz & Kiørboe (1995) , because feeding behaviour is specific to the prey (phytoplankton vs motile prey), and because ambush-mode feeding is much more dependant on turbulence than suspension-mode feeding, it is suggested that prey selection in A. tonsa may be partly governed by turbulence in the ocean.
After Gubanova & al. (p.5) this species appeared in the Black Sea in the early 1970s is supposed replaced the native Paracartia latisetosa, because these species occupied the same ecological niche, but the alien A. tonsa was apparently more resistant to pollution and eutrophisation.
After Chaalali & al. (2013, p.2) Acartia tonsa , first introduced in 1983 by ballast waters, is an example of species that found suitable conditions to establish in the Gironde estuary (France), ecosystem characterized by a strong spatial and temporal variability in both physical and chemical proprerties and anthropogennic pressures (see in David & al., 2007 a, p.429).
Last update : 01/04/2015
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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2015. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at http://copepodes.obs-banyuls.fr/en 
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Marine Planktonic Copepods

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