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ASPECTS OF THE LIMNO-ECOLOGY OF COROPHIUM SPINICORNE STIMPSON (AMPHIPODA) AND GNORIMOSPHAEROMA OREGONENSIS (DANA) (ISOPODA) BY C. H. ERIKSEN The Claremont Colleges, Claremont, California, U.S.A. INTRODUCTION Bousfield (1958) suggests that the relatively rich euryhaline fauna of the American Pacific coastal streams 'and pools (e.g., Anisogammarus ramellus (Weckel), Corophium .rpinicorne Stimpson, Paromoera mohri, Hau.rtoriu.r washingtonianus Thorsteinson, Exo.rphaeroma oregonen.ri.r (Dana), Neomy.ri.r mercedi.r Holmes, and Nerei.r japonica Izuka) is a result of the presence of suf- ficient amounts of chloride in the water supplied there by weather of marine origin depositing moisture inland. In his study of the St. John's River system in Florida, Bousfield (1963) proposed 25 ppm chloride as the upriver limit for the "oligohaline brackish invertebrates". This suggestion of a simple chloride limit, which from his observations he thinks may be of general occurrence (personal communication), is an attractive explanation of "upstream" distribution. Although chloride is undoubtedly of great importance, other general factors should be con- sidered as they interact to effect distribution. For example, Verwey ( 1957) has discussed very illustratively the role of temperature in the osmoregulatory abilities of a number of invertebrates. Hynes ( 1954) has shown interspecific competition to be important to the distribution of
Crustaceana – Brill
Published: Jan 1, 1968
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