Sammanfattning

Two aspects of size-dependent growth were addressed using perch, Perca fluviatilis L, from 22 Swedish lakes. Firstly, maximum annual growth decreased linearly with length after the previous year. Secondly, median or realized growth showed a non-linear pattern, with minimum growth efficiency at intermediate length, probably related to the shift from invertebrate to fish diet. Between-lake variation in size-related growth efficiency was better explained by fish community characteristics than by abiotic factors. The growth of most size classes was negatively related to fish biomass, especially to biomass of 100 to 199-mm perch. Growth efficiency of perch >200 mm was positively related to the proportion of large perch in the community. These size- and density-dependent growth responses suggest that effects of competitive and predatory interactions will often mask the controlling or limiting effects of abiotic factors, such that realized growth of individuals and populations are poorly described by deterministic asymptotic growth models.

Nyckelord

potential growth; realized growth; abiotic factors; fish community structure

Publicerad i

Ecology of Freshwater Fish
2001, Volym: 10, nummer: 4, sidor: 247-256
Utgivare: WILEY-BLACKWELL

Associerade SLU-program

Sjöar och vattendrag


UKÄ forskningsämne

Ekologi


Publikationens identifierare

DOI: https://doi.org/10.1034/j.1600-0633.2001.100407.x

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/87492