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Article

Food Webs and Fish Size Patterns in Insular Lakes Partially Support Climate-Related Features in Continental Lakes

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Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
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Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing 100190, China
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Departamento de Ecología y Gestión Ambiental, CURE, Universidad de la República, Maldonado 20100, Uruguay
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Faculty of Sciences and Technology, University of the Azores, R. Mãe de Deus, 9500-321 Ponta Delgada, Azores, Portugal
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CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratoório Associado, Pólo dos Açores, Rua Mãe de Deus 13 A, 9500-321 Ponta Delgada, Azores, Portugal
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Department of Biology, University of Copenhagen, Universitetsparken 4, 2100 Copenhagen, Denmark
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Arctic Research Centre, Aarhus University, C.F. Møllers Allé 8, Bldg. 1110, 8000 Aarhus C, Denmark
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Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara 06800, Turkey
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Institute of Marine Sciences, Middle East Technical University, Erdemli-Mersin 33731, Turkey
*
Author to whom correspondence should be addressed.
Academic Editor: Angel Perez-Ruzafa
Water 2021, 13(10), 1380; https://doi.org/10.3390/w13101380
Received: 30 March 2021 / Revised: 4 May 2021 / Accepted: 12 May 2021 / Published: 15 May 2021
(This article belongs to the Special Issue Impacts of Human Activities and Climate Change on Freshwater Fish)
Disentangling the effects of climate change on nature is one of the main challenges facing ecologists nowadays. Warmer climates forces strong effects on lake biota for fish, leading to a reduction in size, changes in diet, more frequent reproduction, and stronger cascading effects. Space-for-time substitution studies (SFTS) are often used to unravel climate effects on lakes biota; however, results from continental lakes are potentially confounded by biogeographical and evolutionary differences, also leading to an overall higher fish species richness in warm lakes. Such differences may not be found in lakes on remote islands, where natural fish free lakes have been subjected to stocking only during the past few hundred years. We studied 20 species-poor lakes located in two remote island groups with contrasting climates, but similar seasonality: the Faroe Islands (cold; 6.5 ± 2.8 °C annual average (SD) and the Azores Islands (warm; 17.3 ± 2.9 °C)). As for mainland lakes, mean body size of fish in the warmer lakes were smaller overall, and phytoplankton per unit of phosphorus higher. The δ13C carbon range for basal organisms, and for the whole food web, appeared wider in colder lakes. In contrast to previous works in continental fresh waters, Layman metrics of the fish food web were similar between the two climatic regions. Our results from insular systems provide further evidence that ambient temperatures, at least partially, drive the changes in fish size structure and the cascading effects found along latitude gradients in lakes. View Full-Text
Keywords: stable isotopes; climate change; islands; space-for-time substitution stable isotopes; climate change; islands; space-for-time substitution
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MDPI and ACS Style

Vidal, N.; Amsinck, S.L.; Gonçalves, V.; Azevedo, J.M.N.; Johansson, L.S.; Christoffersen, K.S.; Lauridsen, T.L.; Søndergaard, M.; Bjerring, R.; Landkildehus, F.; Brodersen, K.P.; Meerhoff, M.; Jeppesen, E. Food Webs and Fish Size Patterns in Insular Lakes Partially Support Climate-Related Features in Continental Lakes. Water 2021, 13, 1380. https://doi.org/10.3390/w13101380

AMA Style

Vidal N, Amsinck SL, Gonçalves V, Azevedo JMN, Johansson LS, Christoffersen KS, Lauridsen TL, Søndergaard M, Bjerring R, Landkildehus F, Brodersen KP, Meerhoff M, Jeppesen E. Food Webs and Fish Size Patterns in Insular Lakes Partially Support Climate-Related Features in Continental Lakes. Water. 2021; 13(10):1380. https://doi.org/10.3390/w13101380

Chicago/Turabian Style

Vidal, Nicolas, Susanne L. Amsinck, Vítor Gonçalves, José M.N. Azevedo, Liselotte S. Johansson, Kirsten S. Christoffersen, Torben L. Lauridsen, Martin Søndergaard, Rikke Bjerring, Frank Landkildehus, Klaus P. Brodersen, Mariana Meerhoff, and Erik Jeppesen. 2021. "Food Webs and Fish Size Patterns in Insular Lakes Partially Support Climate-Related Features in Continental Lakes" Water 13, no. 10: 1380. https://doi.org/10.3390/w13101380

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