Life-history responses to environmental change revealed by resurrected rotifers from a historically polluted lake
| Autor: | Diego Fontaneto, Arpat Ozgul, Naomi L. Zweerus, Stefan Sommer |
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| Přispěvatelé: | University of Zurich, Zweerus, Naomi L |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Population dynamics Environmental change Rotifer Aquatic Science 010603 evolutionary biology 01 natural sciences Population density Copper pollution 10127 Institute of Evolutionary Biology and Environmental Studies Brachionus calyciflorus Adaptation Invertebrate Resurrection ecology 1104 Aquatic Science biology Ecology 010604 marine biology & hydrobiology Aquatic animal Brachionus biology.organism_classification 13. Climate action 570 Life sciences 590 Animals (Zoology) |
| Zdroj: | Hydrobiologia Hydrobiologia (The Hague. Print) 796 (2017): 121–130. doi:10.1007/s10750-016-3070-6 info:cnr-pdr/source/autori:Zweerus, Naomi L.; Sommer, Stefan; Fontaneto, Diego; Ozgul, Arpat/titolo:Life-history responses to environmental change revealed by resurrected rotifers from a historically polluted lake/doi:10.1007%2Fs10750-016-3070-6/rivista:Hydrobiologia (The Hague. Print)/anno:2017/pagina_da:121/pagina_a:130/intervallo_pagine:121–130/volume:796 |
| ISSN: | 1573-5117 0018-8158 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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