Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Life-history responses to environmental change revealed by resurrected rotifers from a historically polluted lake |
| Abstract | Life-history adaptations to environmental change can be studied retrospectively in organisms that produce dormant propagules using methods of resurrection ecology. Here, we investigated such responses in a planktonic freshwater rotifer, Brachionus calyciflorus. We resurrected 14 clonal lineages from resting eggs extracted from three distinct sediment layers--representing periods of high, medium and low copper pollution--of a previously contaminated lake (Lake Orta, Italy). We exposed the resurrected clones to four copper concentrations over 14 days and recorded population densities at 48 h intervals. If the original populations in Lake Orta had adapted to the changing pollution levels, we expected to find demographic evidence of this adaptation in the resurrected lineages. However, we found high clonal variation in population-growth dynamics, which was more pronounced within than between pollution periods. Moreover, intrinsic population growth rates (r) increased chronologically. As such, the results did not reveal signs of adaptive evolution. Furthermore, we found that lineages from the period of medium copper pollution invested less into sexual reproduction than lineages from the other periods. By using this bio-demographic perspective, our analysis of resurrected rotifers provides insights into the life-history responses of an aquatic invertebrate in an ever-changing environment. |
| Source | Hydrobiologia (The Hague. Print) 796 (1), pp. 121–130 |
| Keywords | AdaptationBrachionusCopper pollutionPopulation dynamicsResurrection ecology |
| Journal | Hydrobiologia (The Hague. Print) |
| Editor | Kluwer Academic Publishers, Boston, Paesi Bassi |
| Year | 2017 |
| Type | Articolo in rivista |
| DOI | 10.1007/s10750-016-3070-6 |
| Authors | Zweerus, Naomi L.; Sommer, Stefan; Fontaneto, Diego; Ozgul, Arpat |
| Text | 364022 2017 10.1007/s10750 016 3070 6 Scopus 2 s2.0 85006410187 Adaptation Brachionus Copper pollution Population dynamics Resurrection ecology Life history responses to environmental change revealed by resurrected rotifers from a historically polluted lake Zweerus, Naomi L.; Sommer, Stefan; Fontaneto, Diego; Ozgul, Arpat Universitat Zurich; Consiglio Nazionale delle Ricerche Life history adaptations to environmental change can be studied retrospectively in organisms that produce dormant propagules using methods of resurrection ecology. Here, we investigated such responses in a planktonic freshwater rotifer, Brachionus calyciflorus. We resurrected 14 clonal lineages from resting eggs extracted from three distinct sediment layers representing periods of high, medium and low copper pollution of a previously contaminated lake Lake Orta, Italy . We exposed the resurrected clones to four copper concentrations over 14 days and recorded population densities at 48 h intervals. If the original populations in Lake Orta had adapted to the changing pollution levels, we expected to find demographic evidence of this adaptation in the resurrected lineages. However, we found high clonal variation in population growth dynamics, which was more pronounced within than between pollution periods. Moreover, intrinsic population growth rates r increased chronologically. As such, the results did not reveal signs of adaptive evolution. Furthermore, we found that lineages from the period of medium copper pollution invested less into sexual reproduction than lineages from the other periods. By using this bio demographic perspective, our analysis of resurrected rotifers provides insights into the life history responses of an aquatic invertebrate in an ever changing environment. 796 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85006410187 origin=inward zweerus 2017_Hydrobiol_Zweerus et al EV.pdf Articolo in rivista Kluwer Academic Publishers 0018 8158 Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia. The Hague. Print Hydrobiologia Dordrecht The Hague. Print Hydrobiologia Boston The Hague. Print Hydrobiologia London The Hague. Print diego.fontaneto FONTANETO DIEGO |