Associating spatial patterns of zooplankton abundance with water temperature, depth, planktivorous fish and chlorophyll

Ari Voutilainen, Juha Jurvelius, Juha Lilja, Markku Viljanen, Minna Rahkola-Sorsa
2016 unpublished
Voutilainen A., Jurvelius J., Lilja J., Viljanen M. & Rahkola-Sorsa M. 2016: Associating spatial patterns of zooplankton abundance with water temperature, depth, planktivorous fish and chlorophyll. Boreal Env. Res. 21: 101-114. The spatial distribution of zooplankton was studied in a boreal lake system. Distribution patterns were associated with water temperature and depth, abundance of fish, and chlorophyll a concentration. Principal coordinates of neighbor matrices (PCNM) were used to model
more » ... atial structures (vectors between study locations) which were in turn used in regression models to explain plankton distribution. Data were also analyzed using detrended correspondence analysis (DCA). Models based on PCNM highlighted differences between sites, whereas DCA emphasized differences between the epi-, meta-and hypolimnion. Bottom-up regulation was the primary force in determining zooplankton and fish abundance. Signs of top-down regulation were also found. The main forces driving spatial heterogeneity of zooplankton in lakes differed among thermal strata and among zooplankton size categories and species. The study stressed the need for gathering data with more than one method simultaneously and emphasized the benefits of combining results from two or more statistical techniques.
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