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The food and feeding relationships of larval and 0+year juvenile fishes in lowland rivers and connected waterbodies. I. Ontogenetic shifts and interspecific diet similarity

Nunn, A. D.; Harvey, J. P.; Cowx, I. G.

Authors

I. G. Cowx I.G.Cowx@hull.ac.uk



Abstract

Many fish species are zooplanktivorous at the onset of exogenous feeding, but distinct shifts in their foraging biology may occur with development. This study investigated the food and feeding relationships of the larvae and 0+ year juveniles of 13 fish species in 'main river'. 'marina' and 'pond' macrohabitats in the lower River Trent. England. Young larvae had narrow diet spectra, with feeding diversity and the importance of species-specific traits increasing with development. Two main ontogenetic shifts in diet were differentiated, corresponding with the transition from finfold to finformed larvae, and from the larval to the juvenile period. Dietary overlap was generally greatest among ecologically similar species, with competition and resource partitioning most likely where prey availability was lowest. The greater availability of zooplankton in connected waterbodies compared with main river channels provides suitable prey for a wide range of fish species, and may enhance recruitment success. (c) 2007 The Authors. Journal compilation (c) 2007 The Fisheries Society of the British Isles.

Journal Article Type Article
Publication Date 2007-03
Journal JOURNAL OF FISH BIOLOGY
Print ISSN 0022-1112
Electronic ISSN 1095-8649
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 70
Issue 3
Pages 726-742
APA6 Citation Nunn, A. D., Harvey, J. P., & Cowx, I. G. (2007). The food and feeding relationships of larval and 0+year juvenile fishes in lowland rivers and connected waterbodies. I. Ontogenetic shifts and interspecific diet similarity. Journal of fish biology, 70(3), 726-742. https://doi.org/10.1111/j.1095-8649.2007.01334.x
DOI https://doi.org/10.1111/j.1095-8649.2007.01334.x
Keywords 0+ year juvenile fishes; Dietary overlap; Food larval fishes; Lowland rivers; Ontogenetic shifts
Publisher URL https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1095-8649.2007.01334.x