Özet:

A characteristic feature of the Daphnia (Crustacea: Cladocera) life cycle are the so-called ephippia, which are fertilised eggs that need to undergo diapause. When they are shed by the female, they sink to the lake bottom, where they may become embedded in the sediment and may remain viable for decades. Extracting and hatching ephippia in the laboratory and subjecting resurrected lineages to conditions representative of historic lake environments allows retrospective investigation of life-history responses to environmental change. Here we reanalyse data from such a resurrection experiment (Piscia et al., 2015: Bull. Environ. Contam. Toxicol. 94:46–51). Contemporary and past lineages of Daphnia galeata Sars 1863 were obtained from Lake Orta (Italy), a deep, subalpine lake with a well-documented history of industrial copper pollution. Experimental Daphnia were subjected to three copper treatments representative of two levels of historic as well as to current (i.e., unpolluted) lake conditions, and life-table data were collected. With these data at hand, we first estimated vital rates (survival, maturation, and reproduction) and used these rates to project the asymptotic population growth rates ( λ) for each population-by-treatment combination. Next, we performed life-table response experiments (LTRE) to estimate the contributions of the vital rates to observed differences in λ. Finally, we used elasticity analysis to explore the functional relationship between λ and each of the vital rates. We found that survival rates were only compromised at elevated copper levels. Moreover, past, resurrected Daphnia had a higher λ at low copper concentrations compared to unpolluted conditions, but a lower λ when exposed to high copper levels. Contemporary Daphnia, on the other hand, only reproduced successfully in unpolluted water. Under these conditions, however, they had a higher population growth rate than the past Daphnia, suggesting a cost of copper tolerance in the latter. This cost was mainly due to a lower probability of reproduction and reduced fecundity, whereas survival remained largely unaffected. Finally, we found higher elasticity values of λ to survival than to reproductive rates. This suggests that any change in the environment that will affect survival rather than reproductive parameters will have a much larger impact on Lake Orta’s current Daphnia population. Stefan Sommer, University of Zurich Department of Evolutionary Biology and Environmental Studies Arpat Ozgul, University of Zurich Department of Evolutionary Biology and Environmental Studies Supporting Agencies Swiss National Science Foundation Sommer, Stefan, Roberta Piscia, Marina M. Manca, Diego Fontaneto, and Arpat Ozgul. 2016. “Demographic Cost and Mechanisms of Adaptation to Environmental Stress in Resurrected Daphnia”. Journal of Limnology 75 (s2). https://doi.org/10.4081/jlimnol.2016.1292. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations List of Cited By : Population‐level responses to temperature, density and clonal differences in Daphnia magna as revealed by integral projection modelling Marjolein Bruijning, Anne C. M. ten Berge, Eelke Jongejans, Kwang Pum Lee Functional Ecology : 2018 Thermal and Osmotic Tolerance of ‘Irukandji’ Polyps: Cubozoa; Carukia barnesi Robert Courtney, Sally Browning, Tobin Northfield, Jamie Seymour, Robert E. Steele PLOS ONE : 2016 Diet quality impairs male and female reproductive performance and affects the opportunity for selection in an insect model Lennart Winkler, Tim Janicke Ecology and Evolution : 2022 Life‐history responses of a freshwater rotifer to copper pollution Federica R. Schanz, Stefan Sommer, Andrea Lami, Diego Fontaneto, Arpat Ozgul Ecology and Evolution : 2021 Themes by Openjournaltheme.com authors FOR AUTHORS SUBMIT YOUR PAPER Guide for Authors Benefits for Authors How to write a scientific paper How to write a Review article Article Processing Charge Registering new species in ZooBank reviewers FOR REVIEWERS Benefits for Reviewers How to review Thanks to Reviewers links LINKS CNR-IRSA - Water Research Institute Associazione Italiana di Oceanologia e Limnologia International Society of Limnology EFFS - European Federation for Freshwater Sciences International Society for Microbial Ecology flyer JOURNAL FLYER Phytoplankton-zooplankton coupling in a cascade of hypertrophic fishponds 21 September 2023 Marija Radojičić et al. Vol. 82 (2023) Seasonal variation in the relative strength of bottom-up vs top-down effects in pelagic cladoceran populations identified through contribution analysis of birth rate 7 September 2023 Anna A. Kasparson et al. Vol. 82 (2023) In situ effects of arsenic, aluminium and chromium stresses on algal periphyton of the river Ganga at Varanasi, India 30 June 2023 Arpana Yadav et al. Vol. 82 (2023) Periphyton growth on allochthonous input in streams may lead to higher individual growth rates of the invasive New Zealand mud snail (Potamopyrgus antipodarum) 20 June 2023 Sally Ghannam et al. Vol. 82 (2023) Gross mismatches between salmonid stocking and capture record data in a large Alpine lake basin in Northern Italy suggest a low stocking effectiveness for an endangered native trout 16 June 2023 Gianluca Polgar et al. Vol. 82 (2023) @j_limnology Most read last month Longitudinal recovery gradient of macroinvertebrates during different hydrological scenarios in a downstream river reach 107 A georeferenced dataset for occurrence records of the phylum Rotifera in Africa 90 The Freshwater Biodiversity Information System (FBIS) fish data: a georeferenced dataset of freshwater fishes occurring in South Africa 74 Most Cited Article Formation of large colonies: a defense mechanism of Microcystis aeruginosa under continuous grazing pressure by flagellate Ochromonas sp. Cited: 60 19 January 2012 Zhen Yang et al. A numerical index for evaluating phytoplankton response to changes in nutrient levels in deep mediterranean reservoirs Cited: 60 1 February 2009 Aldo MARCHETTO et al. Last Updated: 3 October 2023 Keywords The Journal of Limnology is an Open Access, academic peer-reviewed journal published by PAGEPress®, Pavia, Italy on behalf of the CNR-IRSA, Italy. All credits and honors to PKP for their OJS. Registered in print in Verbania, 7-10-1959, n. 58.

Anahtar Kelimeler: