Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Life-history responses of a freshwater rotifer to copper pollution |
| Abstract | In organisms with dormant stages, life-history responses to past pollution can be studied retrospectively. Here, we study such responses in a rotifer (Brachionus calyciflorus) from the once heavily copper-polluted Lake Orta (Italy). We extracted resting eggs from sediments, established clonal lineages from hatchlings, and exposed newborns of these lineages to one of three copper concentrations that each mimicked a specific period in the lake's pollution history. For each rotifer, we daily collected life-table data. We then estimated treatment-specific vital rates and used a stage-structured population model to project population growth rate ?. We also estimated elasticities of ? to vital rates and contributions of vital rates to observed ?? between copper treatments. As expected, ? decreased with increasing copper concentration. This decrease resulted mostly from a decline in juvenile survival rate (S) and partly from a decline in the survival rate of asexually reproducing females (S). Maturation rate, and with one exception fecundity, also declined but did not contribute consistently to ??. ? was most elastic to S and S, indicating that survival rates were under stronger selection than maturation rate and fecundity. Together, our results indicate that variation in juvenile survival is a key component in the rotifers' copper response. The consistent decrease in S with increasing copper stress and the sensitivity of ? to that decrease also suggest that juvenile survival is a useful indicator of population performance under environmental pollution. |
| Source | Ecology and evolution |
| Keywords | rotifera |
| Journal | Ecology and evolution |
| Editor | Wiley-Blackwell, Oxford, Regno Unito |
| Year | 2021 |
| Type | Articolo in rivista |
| DOI | 10.1002/ece3.7877 |
| Authors | Schanz F.R.; Sommer S.; Lami A.; Fontaneto D.; Ozgul A. |
| Text | 455761 2021 10.1002/ece3.7877 Scopus 2 s2.0 85111544913 rotifera Life history responses of a freshwater rotifer to copper pollution Schanz F.R.; Sommer S.; Lami A.; Fontaneto D.; Ozgul A. Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland, , Switzerland; Water Research Institute, National Research Council of Italy, Verbania Pallanza, Water Research Institute, National Research Council of Italy, Verbania Pallanza, Italy, , Italy In organisms with dormant stages, life history responses to past pollution can be studied retrospectively. Here, we study such responses in a rotifer Brachionus calyciflorus from the once heavily copper polluted Lake Orta Italy . We extracted resting eggs from sediments, established clonal lineages from hatchlings, and exposed newborns of these lineages to one of three copper concentrations that each mimicked a specific period in the lake s pollution history. For each rotifer, we daily collected life table data. We then estimated treatment specific vital rates and used a stage structured population model to project population growth rate . We also estimated elasticities of to vital rates and contributions of vital rates to observed between copper treatments. As expected, decreased with increasing copper concentration. This decrease resulted mostly from a decline in juvenile survival rate S and partly from a decline in the survival rate of asexually reproducing females S . Maturation rate, and with one exception fecundity, also declined but did not contribute consistently to . was most elastic to S and S, indicating that survival rates were under stronger selection than maturation rate and fecundity. Together, our results indicate that variation in juvenile survival is a key component in the rotifers copper response. The consistent decrease in S with increasing copper stress and the sensitivity of to that decrease also suggest that juvenile survival is a useful indicator of population performance under environmental pollution. Published version http //www.scopus.com/record/display.url eid=2 s2.0 85111544913 origin=inward Life history responses of a freshwater rotifer to copper pollution ece3.7877.pdf Articolo in rivista Wiley Blackwell 2045 7758 Ecology and evolution Ecology and evolution Ecology and evolution andrea.lami LAMI ANDREA diego.fontaneto FONTANETO DIEGO |