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Food selectivity versus prey availability: a study using the marine fish Pomatoschistus microps
Carin Magnhagen1, Anne-Marie Wiederholm1
1Dept. of Zoology, Uppsala University, Box 561, S-751 22, Uppsala, Sweden.
Oecologia
|March 18, 2017
Summary
The common goby (Pomatoschistus microps) prefers Corophium volutator, even when less abundant. This fish preys on the closest, most active prey available, regardless of species or size.
Area of Science:
- Marine biology
- Ichthyology
- Behavioral ecology
Background:
- The common goby (Pomatoschistus microps) is a widespread coastal fish.
- Understanding the feeding ecology of P. microps is crucial for coastal ecosystem dynamics.
Purpose of the Study:
- To investigate the dietary preferences of the common goby (P. microps).
- To identify the key prey items influencing goby feeding behavior.
Main Methods:
- Field observations of goby diet on the Swedish west coast.
- Laboratory experiments to assess prey selection under controlled conditions.
Main Results:
- The primary prey for P. microps were Corophium volutator, chironomid larvae, and Nereis spp.
- Corophium volutator was the most frequently consumed prey, irrespective of its abundance.
- Goby feeding behavior was characterized by a "closest mobile prey" selection strategy, independent of prey species or size.
Conclusions:
- Prey activity and visibility significantly influence prey selection by P. microps.
- The common goby exhibits opportunistic feeding, prioritizing proximity and mobility over specific prey types.
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