Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1002/etc.5620210120
Volltext Shareable Link
Titel (primär) Population response to toxicants is altered by intraspecific interaction
Autor Liess, M.
Quelle Environmental Toxicology and Chemistry
Erscheinungsjahr 2002
Department OEKOTOX
Band/Volume 21
Heft 1
Seite von 138
Seite bis 142
Sprache englisch
Abstract Negative interaction between individuals is a distinctive feature of populations. The question is addressed whether the population response to toxicants (e.g., the pyrethroid pesticide fenvalerate) is altered by the strength of negative intraspecific interaction. Larvae of the trichopteran Limnephilus lunatus Curtis were exposed for 1 h to fenvalerate, then larval survival and adult emergence were monitored in outdoor stream microcosms over eight months. Degree of interaction was varied by changing larval densities. No survival was observed after 15 d at 100 mug/L. Survival decreased slightly at 10 mug/L when strong interaction was present. Survival in the range of 0.001 to 1 mug/L was similar to that in the control, regardless of the strength of interaction. In contrast. chronic effects differed widely according to the degree of interaction, Weak interaction resulted in high survival of controls, a lowest-observed-effect concentration (LOEC) (mortality) of 0.1 mug/L, a delay in development at 0.001 to 0.01 mug/L, and reduced weight of adults from 0.01 mug/L on. Strong interaction resulted in low survival of controls, a LOEC (mortality) of 100 mug/L, and a delay in development at 0.1 mug/L. The suggestion Aas made that these differences in chronic effects are caused by a toxicant-induced reduction of negative intraspecific interaction at high concentrations (greater than or equal to1 mug/L). Hence, direct effects of the toxicant are partly compensated because of indirect reduction of negative interaction compared to the control. Interaction is not decreased at low concentrations (less than or equal to0.1 mug/L) and, thus, effects of the toxicant are not compensated, Accordingly, the response to toxicants at the population level when negative interaction is present differs from the response at individual level.
dauerhafte UFZ-Verlinkung
Liess, M. (2002):
Population response to toxicants is altered by intraspecific interaction
Environ. Toxicol. Chem. 21 (1), 138 - 142 10.1002/etc.5620210120