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Veselý L, Ercoli F, Ruokonen TJ, Bláha M, Duras J, Haubrock PJ, Kainz M, Hämäläinen H, Buřič M, Kouba A. Strong temporal variation of consumer δ 13C value in an oligotrophic reservoir is related to water level fluctuation. Sci Rep 2023; 13:3642. [PMID: 36871020 PMCID: PMC9985621 DOI: 10.1038/s41598-023-30849-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 03/02/2023] [Indexed: 03/06/2023] Open
Abstract
Using stable carbon and nitrogen isotope analysis (δ13C and δ15N) to assess trophic interactions in freshwater ecosystems is a well established method, providing insight into ecosystem functioning. However, the spatial and temporal variability of isotope values, driven by environmental fluctuation is poorly understood and can complicate interpretations. We investigated how the temporal variation of stable isotopes in consumers (fish, crayfish and macrozoobenthos) of a canyon-shaped oligotrophic reservoir is associated with environmental factors such as water temperature, transparency, flooded area, and water quality measures. Consumers and their putative food sources were sampled and analyzed for carbon and nitrogen stable isotopes annually, and environmental parameters were measured monthly from 2014 to 2016. Results revealed significant differences in δ13C and δ15N values in each consumer among studied years. Over the years, fish and crayfish expressed differences in δ13C between 3 and 5‰, whereas in zoobenthos differences were 12‰. Variability in δ15N was similar across all consumers (2-4‰). Moreover, results suggest that the flooded area of the reservoir was a major driver of δ13C stable isotope values variation in consumers, while variation in δ15N was not linked to any of the studied environmental factors. Bayesian mixing models further showed significant changes in the origin of detritivorous zoobenthos carbon sources (reversal shift from terrestrial detritus to algae origin) between years with low water level to years with the standard water level. Other species showed only slight differences in food source utilization among years. Our study highlights the importance of environmental factors as sources of variation in consumer's stable isotope values which should be considered especially when studied ecosystem strongly fluctuate in some environmental factor.
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Affiliation(s)
- Lukáš Veselý
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic. .,WasserCluster Lunz - Biological Station, Dr. Carl Kupelwieser Promenade 5, 3293, Lunz Am See, Austria.
| | - Fabio Ercoli
- Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland.,Institute of Agricultural and Environmental Sciences, Chair of Hydrobiology and Fishery, Estonian University of Life Sciences, Kreutzwaldi 5, 51006, Tartu, Estonia
| | - Timo J Ruokonen
- Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland.,Natural Resources Institute Finland, Survontie 9 A, 40500, Jyväskylä, Finland
| | - Martin Bláha
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic
| | - Jindřich Duras
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic
| | - Phillip J Haubrock
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic.,Department of River Ecology and Conservation, Senckenberg Research Institute and Natural History Museum Frankfurt, Clamecystr. 12, 63571, Gelnhausen, Germany.,CAMB, Center for Applied Mathematics and Bioinformatics, Gulf University for Science and Technology, Mubarak Al-Abdullah, Kuwait
| | - Martin Kainz
- WasserCluster Lunz - Biological Station, Dr. Carl Kupelwieser Promenade 5, 3293, Lunz Am See, Austria.,Department of Biomedical Research, Danube University Krems, Dr. Karl Dorrek-Straße 30, 3500, Krems, Austria
| | - Heikki Hämäläinen
- Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland
| | - Miloš Buřič
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic
| | - Antonín Kouba
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic
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Karjalainen J, Ruokonen TJ, MarjomäKi TJ, Martikainen A, Pursiainen M, Sarvala J, Tarvainen M, Ventelä AM. Predation by signal crayfish Pacifastacus leniusculus on fish eggs and its consequences for coregonid recruitment. J Fish Biol 2015; 86:651-667. [PMID: 25605004 DOI: 10.1111/jfb.12588] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 10/17/2014] [Indexed: 06/04/2023]
Abstract
The character and magnitude of predation by the invasive, ectothermic Pacifastacus leniusculus, a crayfish widely introduced to Europe and Japan from North America, on the eggs of coregonid fishes, vendace Coregonus albula and whitefish Coregonus lavaretus were examined by experimentation, modelling and field data. The present results showed that P. leniusculus has the potential to be very efficient predator of fish eggs under winter conditions, but the predation by P. leniusculus did not significantly decrease production of coregonid larvae during the years with a high P. leniusculus population in the study lake. Hence, the mortality caused by the novel invertebrate predator appeared to compensate for other yet unexplored mortality factors instead of having an additive effect on the present salmonids.
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Affiliation(s)
- J Karjalainen
- Department of Biological and Environmental Science, P. O. Box 35, University of Jyväskylä, 40014 Jyväskylä, Finland
| | - T J Ruokonen
- Department of Biological and Environmental Science, P. O. Box 35, University of Jyväskylä, 40014 Jyväskylä, Finland
| | - T J MarjomäKi
- Department of Biological and Environmental Science, P. O. Box 35, University of Jyväskylä, 40014 Jyväskylä, Finland
| | - A Martikainen
- Department of Biological and Environmental Science, P. O. Box 35, University of Jyväskylä, 40014 Jyväskylä, Finland
| | - M Pursiainen
- Finnish Game and Fisheries Institute, Survontie 9/Technopolis, 40500 Jyväskylä, Finland
| | - J Sarvala
- Department of Biology, University of Turku, FI-20014 Turku, Finland
| | - M Tarvainen
- Pyhäjärvi Institute, Sepäntie 7, 27500 Kauttua, Finland
| | - A-M Ventelä
- Pyhäjärvi Institute, Sepäntie 7, 27500 Kauttua, Finland
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