Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Pseudodiaptomidae ( Family )
            Pseudodiaptomus ( Genus )
Pseudodiaptomus forbesi  (Poppe & Richard, 1890)   (F,M)
Syn.: Schmackeria forbesi Poppe & Richard, 1890 (p.396, figs.F,M); Marsh, 1933 (p.44, figs.F,M); Shen & Tai, 1962 (p.101, Rem.).
Burchardt, 1913, (p.380, fig.F, M: 11E, 12H, Rem. p.392: phylogeny); Sewell, 1948 (p.421); Shen & Lee, 1963 (p.577); Walter, 1986 (p.132); 1986 a (p.503); 1987 (p.367); Orsi & Walter, 1991 (p.553, figs.F,M)
Species Pseudodiaptomus forbesi - Plate 1 of morphological figuresIssued from : C.D. Marsh in Proc. U.S. natn. Mus., 1933, 82 (18) (2959). [Pl. 21, figs.5, 7]. As Schmackeria forbesi.
Female (from Yangtze Kiang): 5, P5; 7, urosome with egg sac (dorsal).

Species Pseudodiaptomus forbesi - Plate 2 of morphological figuresIssued from : C.D. Marsh in Proc. U.S. natn. Mus., 1933, 82 (18) (2959). [Pl. 22, fig.4]. As Schmackeria forbesi. After Burckhardt, 1913.
Male: 4, P5.

Compl. Ref.:
Ohtsuka & al., 1995 (p.159); Cordell & al., 1997 (p.2, invasive species); Mauchline, 1998 (p.507); Choi & al., 2005 (p.710: Tab.III); Humphrey, 2008 (p.64, 84: Appendix A); Ohtsuka & al., 2008 (p.115, Table 6); Cordell & al., 2008 (p.753); Bollens & al., 2011 (p.1358, Table III, fig.8); DiBacco & al., 2012 (p.483, Table S1, ballast water transport); Bollens & al., 2012 (p.101, fig.2, Table 1, species competition); Kimmerer & al., 2014 (p.722, reproduction , growth vs food); Sabia & al., 2015 (p.460, Table 3, Rem.)
NZ: 3

Distribution map of Pseudodiaptomus forbesi by geographical zones
Species Pseudodiaptomus forbesi - Distribution map 2
Chart of 1996
Species Pseudodiaptomus forbesi - Distribution map 3Issued from : M. Winder, A.D. Jassby & R.M. Nally in Ecology Letters, 2011, 14. [p.753, Fig.3, d].
Historical abundances of introduced species in the upper San Francisco Estuary between 1972 and 2009.
Adult stages are shown because immature stages were not continuously identified.
Pseudodiaptomus spp. is dominated by P. forbesi, whereas P. marinus contributed in small numbers.
China Seas (East China Sea, South China Sea, Yangtze-Kiang Riv.), Japan, California, San Francisco Estuary
N: 12
(1062) F: 1,20-1,35; M: 1,20; {F: 1,20-1,35; M: 1,20}
Rem.: Incomplete data.
In Lobus species group (forbesi subgroup) after Walter & al. 2006, p.203.
Form collected originally in fresh water near Shanghai, transported in ships ballasts to California (Sacramento Estuary).
According to Cordell & al., 2008 (p.753) the 1st record of this species in San Francisco estuary is 1987 and in Columbia River 2002.
ForBollens & al (2012) three non-indigenous species (of which P. forbesi) and two native planktonic copepods (Eurytemora affinis, Diacyclops thomasi) to co-occur and overlap to varying degrees in their distributions in the lower Columbia River estuary suggesting strong potential for competition. It is necessary to distinguish between the relative importance of biological ( competition and predation) and physico-chemical processes (freshwater runoff, eutrophisation) in regulating the dtnamics of native and non-indigenous copepods.
Last update : 02/09/2019
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed June 16, 2024]

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