Seasonal shifts in the vertical distribution of fish in a shallow coastal area

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Publikationens författare: Mustamaki N, Jokinen H, Scheinin M, Bonsdorff E, Mattila J
Förläggare: OXFORD UNIV PRESS
Publiceringsår: 2016
Tidskrift: ICES Journal of Marine Science
Tidskriftsakronym: ICES J MAR SCI
Volym: 73
Nummer: 9
Artikelns första sida, sidnummer: 2278
Artikelns sista sida, sidnummer: 2287
Antal sidor: 10
ISSN: 1054-3139
eISSN: 1095-9289


Abstrakt

Depth structures aquatic habitats, creating substantial differences in the species composition of underwater communities even at small intervals. Those communities also undergo considerable cyclic variation annually. In this study, we surveyed variation in the vertical distribution of fish in a shallow (20 m) coastal basin in the northern Baltic Sea during the ice-free period from May to October. The waters were strongly mixed throughout the season and only transient signs of stratification were observed. As production shifted towards higher trophic levels over summer, with sequential biomass peaks in zooplankton and juvenile fish, the vertical distribution of the entire fish assemblage became increasingly even. The results suggest that spatial resource partitioning can be strongly correlated with seasonal productivity cycles even in physically uniform environments with high connectivity. Further, the results stress the importance of sampling design (seasonal and vertical coverage) of fish studies in shallow coastal areas.


Nyckelord

archipelago, Baltic Sea, Clupea harengus membras, depth-distribution, fish assemblage, spatial resource partitioning

Senast uppdaterad 2020-02-04 vid 08:32