Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Acartiidae ( Family )
            Acartia ( Genus )
                Odontacartia ( Sub-Genus )
Acartia (Odontacartia) ohtsukai  Ueda & Bucklin, 2006   (F,M)
Syn.: Acartia pacifica : Brodsky, 1948 (p.73, Pl.24: figs.1-6, F,M); 1950 (p.422, fig.299: F,M); Chen & Zhang, 1965 (p.112, Pl.49: figs.9-12); Zheng & al., 1965 (p.149, fig.70); Al-Yamani & Prusova, 2003 (p.91, figs.F,M)
Ref.:
Ueda & Bucklin, 2006 (p.78, figs.F,M, Rem.); Moon & al., 2008 (p.61, figs.F,M); Al-Yamani & al., 2011 (p.84, 86, figs.F,M)
Species Acartia (Odontacartia) ohtsukai - Plate 1 of morphological figuresissued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.49, 9-12]. As Acartia pacifica.
Female (from E China Sea): 9, habitus (dorsal); 10, P5 (posterior).

Male: 11, habitus (dorsal); 12, P5 (posterior).


Species Acartia (Odontacartia) ohtsukai - Plate 2 of morphological figuresIssued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.423, Fig.298]. As Acartia pacifica.
Female (from Sea of Japan): habitus (dorsal); urosome (dorsal); S5, P5.

Male: habitus (dorsal); last thoracic segment and urosome (dorsal); S5, P5.


Species Acartia (Odontacartia) ohtsukai - Plate 3 of morphological figuresissued from : F.Y. Al-Yamani & I. Prusova in Common Copepods Northwestern Arabian Gulf : Identification Guide. Kuwait Institute for Scientific Research, 2003. [p.91, Fig.33]. As Acartia (Odontacartia) pacifica.
Female: A, habitus (dorsal); B, idem (lateral left side); C, urosome (dorsal); D, idem (lateral left side); E, rostrum (ventral); F, P5.


Species Acartia (Odontacartia) ohtsukai - Plate 4 of morphological figuresissued from : F.Y. Al-Yamani & I. Prusova in Common Copepods Northwestern Arabian Gulf : Identification Guide. Kuwait Institute for Scientific Research, 2003. [p.93, Fig.34]. As Acartia (Odontacartia) pacifica.
Female: J and K, urosome (dorsal; abnormal).

Male: G, habitus (dorsal); H, urosome (dorsal); I, P5.


Species Acartia (Odontacartia) ohtsukai - Plate 5 of morphological figuresIssued from : S.E. Moon, S. Ohtsuka, H. Ueda & H.Y. Soh in Zootaxa, 2008, 1841. [p.62, Fig.1].
Female (from Gwangyang Bay); A, habitus (dorsal); B, P5.

Male (from Gwangyang Bay): C, habitus (dorsal); D, P5 (r: right leg; I: left leg).

Scale bars: 200 µm (A, C); 50 µm (B, D).

Compl. Ref.:
Ohtsuka & al., 2008 (p.115, Table 6); Soh & al., 2013 (p.723: Rem.)
NZ: 3

Distribution map of Acartia (Odontacartia) ohtsukai by geographical zones
Species Acartia (Odontacartia) ohtsukai - Distribution map 2Issued from : S.E. Moon, S. Ohtsuka, H. Ueda & H.Y. Soh in Zootaxa, 2008, 1841. [p.63, Fig.2].
Temperature-salinity-abundance diagram for A. ohtsukai and A. pacifica.
Aundance (ind./m3) of each species is estimated by multiplying numbers on scale by 100 for A. ohtsukai (black circle) and A. pacifica (white circle).

Nota: Zooplankton samples were collected from 40 stations withn Gwangyang (southern Korea), towed vertically from the bottom to the surface layer during November 2005, and February, May and August, 2006. Specimens identified as O. ohtsukai and A. pacifica were sorted from the samples. Patterns of their occrrence were plotted on a Temperature-Salinity diagram.
The habitats of specimens as A. ohtsukai and A. pacifica in Gwangyang Bay were pronouncedly segregated.
A. ohtsukai was found in Gwangyang Bay and in adjacent coastal zone after the rainy season in late June to July when a large volume of freshwater flows into Gwangyang Bay from the Seomjin River. This inflow decreases salinity to less than 30.0 psu. In contrast, its sibling species A. pacifica occurred offshore in more than 32.0 psu. As the salinity of the regions again increased above 32.0 psu after the rainy season, A. ohtsukai was replaced by A. pacifica; at this time A. ohtsukai was restricted in its distribution to the Seomjin River estuary. Both species were absent from those areas where the water temperature was lower than 12°C.
Loc:
Arabian Gulf (Kuwait), Japan (Rokkaku River estuary, Ariaka Bay), China Seas (East China Sea), S Korea (Gwangyang Bay, Seomjin River estuary), Eastern Siberia, Mouth of Amur River
N: 7
Lg.:
(22) F: 1,15-1,06; M: 1,01-0,95; (290) F: 1,2-1,35; M: 1-1,2; (937) F: 1,44-1,51; M: 1,26-1,33; (953) F: 1,19-1,23; M: 1,03-1,05; {F: 1,06-1,51; M: 0,95-1,33}
Rem.: littoral.
Confounded before 2006 with Acartia pacifica.
For Moon & al. (p.61) morphological characteristics of the specimens from Korea waters are similar to those from Japan (Ueda & Bucklin, 2006), except for a slightly larger length/width ratio of the female caudal ramus, shorter spines on the 3rd urosomite of the female, a square medial projection of the 2nd exopodal segment of the male right P5 and the shorter 1st exopodal segment of the male left P5. The habitats of specimens identified as A. ohtsukai and A. pacifica in Korea waters were pronouncedly segregated. A. pacifica occurred offshore in more than 32.0 psu.
Last update : 19/02/2014
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