Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Species diversity hinders adaptation to toxicants
Autor Becker, J.M.; Liess, M.;
Journal / Serie Environmental Science & Technology
Erscheinungsjahr 2017
Department OEKOTOX;
Band/Volume 51
Heft 17
Sprache englisch;
POF III (gesamt) T42;
UFZ Querschnittsthemen RU3;
Abstract Environmental toxicants such as pesticides exert strong selection pressure on many species. While the resulting development of pesticide resistance in agricultural pest species is well-known, reports on the extent of adaptation in exposed nontarget species are contradictory. These contradictory reports highlight a continuing challenge in understanding the relevant ecological mechanisms that facilitate or hinder adaptation to toxicants in the field. Here we show that species diversity hinders the adaptation to toxicants. In agricultural streams with low diversity, we observed an up to 8-fold increase in insecticide tolerance in a total of 17 macroinvertebrate species that was not observed in more diverse communities under similar contamination. High species diversity occurred independently from adjacent nonpolluted refuge areas. Therefore, the low level of adaptation in diverse streams cannot be explained by an increased recolonization of sensitive individuals from refuge areas. Instead, high intraspecific competition may facilitate the selection for increased tolerance in low-diverse communities. In diverse communities, by contrast, species interactions may reduce intraspecific competition and, thus, the potential for developing toxicant resistance. We suggest that this mechanism may be the general case in adaptation to environmental stressors. Additionally, we conclude that the current framework for risk assessment of pesticides is not protective against selection for tolerant organisms and the associated risk of genetic erosion.
ID 19351
dauerhafte UFZ-Verlinkung
Becker, J.M., Liess, M. (2017):
Species diversity hinders adaptation to toxicants
Environ. Sci. Technol. 51 (17), 10195 - 10202