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Remains of Bosmina in sediments reflects historical changes in fish populations in a northern Swedish lake
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Based on morphological measurements on Bosmina in a sediment core from a boreal lake we estimated 60 years back in time historical changes in Planktivore Community Capacity (PCC), a recent derived approach to estimate past planktivore pressure in lakes. We then validated the PCC approach with available information on changes in the lake fish community based on historical knowledge and more recent fish population studies in the lake. Based on available data on fish density, size structure and size dependent attack rate functions on zooplankton we calculated a measure of planktivore pressure in the lake, the Planktivore Population Capacity (PPC). The reconstructed PCC development over the time from Bosmina remains in the sediment core correlated well with PPC estimates (r2 = 0.89 p<0.05) as well as qualitatively with historical information on the development of fish community in the lake. The results from our study suggest that the derived PCC function based on morphological measurements on Bosmina remains in sediments can successfully be used to track historical changes in planktivore communities in lakes.

National Category
Natural Sciences
Research subject
Limnology
Identifiers
URN: urn:nbn:se:umu:diva-53559OAI: oai:DiVA.org:umu-53559DiVA: diva2:513444
Available from: 2012-04-02 Created: 2012-04-02 Last updated: 2012-04-05Bibliographically approved
In thesis
1. Fingerprints of planktivory: paleolimnological evidence of past fish community structure and dynamics
Open this publication in new window or tab >>Fingerprints of planktivory: paleolimnological evidence of past fish community structure and dynamics
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Planktivorous fish affect the species composition, size and morphology of their zooplankton prey by size selective predation. Remains of cladocerans are deposited in the lake sediments and this microfossil community hence reflects the historical changes in the planktivore fish community. Most earlier work on quantitatively inferring past planktivory deals with ephippia (resting eggs) of Daphnia, however these remains are very scarce in northern Swedish lakes. In these lakes, often dominated by fish that are not obligate planktivores, such as perch (Perca fluviatilis), the individual size to a large degree determines the type of resource consumed. Therefore, in these lakes, the size distribution as well as the density of the fish community determines the overall planktivoryThis thesis deals with evaluating the use of Bosmina remains in the sediment as indicators of past planktivory. I developed a transfer function based on Bosmina remains to be used in oligotrophic lakes with omnivorous species to reconstruct past planktivory. I test the transfer function in a lake where the history is to a large extent known. Furthermore, in this thesis a novel quantitative measure of planktivore pressure, the PCC (Planktivore Community Capacity) was developed. It was also possible to compare the morphology measurements of carapace length and mucro length of contemporary Bosmina sampled in the lake, with the same measurements on microfossils of Bosmina sedimented during the corresponding time period. By using the resurrection approach this thesis also evaluates the use of Ceriodaphnia clones as indicators of micro-evolutionary responses to past planktivory.From the studies in this thesis I can draw some major conclusions; the morphological measurements carapace length and mucro length of Bosmina can be used to infer past planktivory in northern Swedish lakes. PCC has a higher explanatory power than CPUE in these lakes dominated by omnivorous fish. The morphology of the contemporary Bosmina corresponds well with the remains found in the sediment dating from the same time period. Both the contemporary and microfossil Bosmina changes in body size characteristics was in turn strongly related to PPC. Finally, the hatching of Ceriodaphnia ephippia is promising for studying past planktivory, both because of the high viability of the ephippia and the relationship between eye area and inferred PCC.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2012. 33 p.
Keyword
planktivory, foraging efficiency, cladoceran remains, Bosmina, planktivore community capacity, PCC, Ceriodaphnia, reserrection
National Category
Ecology
Research subject
Animal Ecology
Identifiers
urn:nbn:se:umu:diva-53561 (URN)978-91-7459-395-2 (ISBN)
Public defence
2012-04-27, KBC-huset, Lilla Hörsalen, KB3A9, Umeå Universitet, Umeå, 13:00 (English)
Opponent
Supervisors
Available from: 2012-04-04 Created: 2012-04-02 Last updated: 2012-04-02Bibliographically approved

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Åhlén, EmmaByström, PärKorsman, TomPersson, Lennart

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