Premium
Effect of zinc on four populations and two generations of Gammarus pulex (L.)
Author(s) -
CRANE MARK
Publication year - 1995
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1995.tb00392.x
Subject(s) - gammarus pulex , pulex , biology , zoology , offspring , toxicity , daphnia pulex , zinc , toxicology , zinc toxicity , ecotoxicology , ecology , amphipoda , crustacean , genetics , cladocera , chemistry , pregnancy , daphnia , organic chemistry
SUMMARY 1. The amphipod Gammarus pulex (L.) is increasingly used in toxicity assessments and is usually obtained from wild populations. Interpopulation variability in response to toxicants may be due to genetic or phenotypic differences and could be large in wild‐caught organisms exposed to different environmental conditions. This paper describes an investigation designed to assess the extent of lethal and sublethal variability between four different G. pulex populations when exposed to zinc, and to determine whether differences observed in the parental generation were also apparent in offspring bred in the laboratory. 2. The mortality of G. pulex from one of the four field‐caught populations (Crags Stream) was significantly lower than for animals from the other three populations for the first 2 days of exposure. After 6 days’ exposure the LC 50 values for all four populations did not differ significantly, and were approximately 1.0 mg Zn 1‐ −1 . Sublethal effects on feeding rate after 6 days’ exposure were also similar for all four populations (feeding rate EC 50 approximately 0.5 mg Zn 1‐ −1 ). 3. Lethal effects on the F 1 generation were similar among the four populations, in contrast to the short‐term differences observed in the parental generation. These results suggest that interpopulation differences in zinc tolerance in G. pulex are short‐lived, and phenotypically rather than genetically based.