Prey selection and growth in 0+ Eurasian perch Perca fluviatilis L. in littoral zones of seven temperate lakes
Laen...
Kuupäev
2022
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Wiley
Abstrakt
We studied the relationships between the planktonic food base and feeding patterns
of juvenile mid-summer/
early autumn Eurasian perch Perca fluviatilis L., a common
predatory freshwater fish in large parts of Europe and Asia. The feeding of 0+
perch was studied during summer and autumn in littoral habitats of seven lakes with
different environmental conditions –four
Latvian (Auciema, Riebinu, Vārzgūnes,
Laukezers) and three Estonian (Kaiavere, Prossa and Akste) lakes. Simultaneously, the
abundance, biomass and structure of zooplankton communities were examined. We
focused on the littoral areas because many studies in lakes suggest that littoral habitats
are particularly important for 0+ fish growth and survival. We were interested
in the question: can the diet and growth of 0+ perch be explained by zooplankton
community structure? We also presumed that if the amount of zooplankton is low,
more benthic invertebrates will be consumed by 0+ perch. Opposite to expectations,
we found that zooplankton always counted for over 90% of diet biomass in perch.
There were also clear correlations between the zooplankton biomass in a given lake,
the zooplankton biomass in 0+ perch stomachs, and the fish growth rate. The study
also suggested that nutrient enrichment can positively impact the 0+ perch feeding
conditions in lakes.
The project is financed by the European Regional Development Fund, the State budget of the Republic of Latvia and the foundation “Institute for Environmental Solutions”. Funding for this project was also provided by the European Union‘s Horizon 2020 research and innovation programme under Grant Agreement No. 951963 (TREICLAKE “Towards Research Excellence and Innovation Capacity in Studying Lake Ecosystems Functional Structures and Climate Change Impact”).
The project is financed by the European Regional Development Fund, the State budget of the Republic of Latvia and the foundation “Institute for Environmental Solutions”. Funding for this project was also provided by the European Union‘s Horizon 2020 research and innovation programme under Grant Agreement No. 951963 (TREICLAKE “Towards Research Excellence and Innovation Capacity in Studying Lake Ecosystems Functional Structures and Climate Change Impact”).
Kirjeldus
Märksõnad
exogenous feeding, food selectivity, perch, young-of- the- year fish, zooplankton, articles