Survival and reproduction of Gammarus spp. (Amphipoda) following short-term exposure to elevated temperatures
Gammarus spp. (G. daiberi and G. tigrinus) experienced no increased latent mortalities for periods up to 10 days after being exposed to an 8.3C ..delta..T above an ambient temperature of 25.5C for periods up to 60 minutes. An 11.1C ..delta..T above an ambient temperature of 26.5 C resulted in significant reductions in survival in groups of Gammarus spp. exposed for 30 and 60 minutes. No significant mortalities were observed, however, following a 5-minute exposure to the 11.1 C ..delta..T. At an ambient temperature of 11.7 C, Gammarus spp. exposed to 16.7 C ..delta..T's for periods up to 180 minutes displayed no increased mortalities 10 days after exposure. A sustained 17-day exposure of Gammarus spp. to a 15.6 C ..delta..T at ambient temperatures of 11.2 to 7.1 C resulted in no increased mortalities and stimulated reproductive behavior. Subsequent reproductive activities were not affected by up to 60-minute exposures of mature Gammarus spp. to an 8.3C ..delta..T at an ambient temperature of 26.0 C. The same exposure also did not affect the release of young by ovigerous female Gammarus spp. An 11.0 C ..delta..T for 30 minutes resulted, however, in almost no release of young from ovigerous females. (auth)
- Research Organization:
- New York Univ., NY
- OSTI ID:
- 7226159
- Journal Information:
- Chesapeake Sci.; (United States), Vol. 17:1
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
CRUSTACEANS
TEMPERATURE EFFECTS
BIOLOGICAL EFFECTS
MORTALITY
REPRODUCTION
TIME DEPENDENCE
ANIMALS
AQUATIC ORGANISMS
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