The micro-evolutionary potential of Daphnia magna population exposed to temperature and cadmium stress.
This study examines micro-evolutionary aspects of a natural Daphnia magna population exposed to Cd. To this end, a set of hypotheses related to micro-evolutionary responses and to how these are influenced by temperature and Cd stress, were tested. Life-table experiments were conducted with 14 D. magna clones collected from an unpolluted lake following a 2x2 design with Cd concentration and temperature as the factors (control vs. 5 microg/L cadmium, 20 vs. 24 degrees C). Several fitness traits were monitored during 21 days. Our results demonstrate (1) that chemicals can have effects on key population genetic characteristics such as genetic variation and between-trait correlations and (2) that these effects may differ depending on temperature. Their findings also suggests that further research is needed to understand the importance of combined chemical-global warming stress for micro-evolutionary responses of organisms. These aspects are currently not accounted for in any regulatory environmental risk assessment procedure.
Messiaen
Marlies
M
Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, Department of Applied Ecology and Environmental Biology, Ghent University (Ugent), Josef Plateaustraat 22, B-9000 Gent, Belgium. marlies.messiaen@Ugent.be
De Schamphelaere
Karel A C
KA
Muyssen
Brita T A
BT
Janssen
Colin R
CR
D000064:Acclimatization / Q000187:drug effects / Q000235:genetics; D000818:Animals; D001530:Belgium; D002104:Cadmium / Q000633:toxicity*; D003621:Daphnia / Q000187:drug effects* / Q000235:genetics; D054750:Ecotoxicology; D019143:Evolution, Molecular; D014644:Genetic Variation; D012098:Reproduction / Q000187:drug effects / Q000235:genetics; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D014874:Water Pollutants, Chemical; D002104:Cadmium