Home > Research > Publications & Outputs > Altered complementary feeding strategies of the...
View graph of relations

Altered complementary feeding strategies of the consumers Hydrobia ulvae and Idotea emarginata via passive selectivity

Research output: Contribution to journalJournal article

Published
Close
<mark>Journal publication date</mark>09/2009
<mark>Journal</mark>Helgoland Marine Research
Issue number3
Volume63
Number of pages9
Pages (from-to)189-197
Publication StatusPublished
<mark>Original language</mark>English

Abstract

This study aimed to identify differences in selectivity, foraging behaviour and complementary feeding of two benthic consumers (the isopod Idotea emarginata and the snail Hydrobia ulvae) using traditional cell counting as an indicator for algal biomass reduction and stable isotope labelling to detect differences in assimilation and digestion. We hypothesized that even when active feeding preferences of food components are not apparent, passive selectivity via mechanisms such as food assimilation and digestion can be of relevance. Algal biomass was reduced to a similar degree by the grazers independently from grazer and prey combinations without any indication for an active choice of food components. However, the isotope labelling approach indicated that passive selectivity can alter complementary feeding strategies, as we detected shifts in feeding preferences in relation to food quantity and competition. Thus, stable isotope labelling of food components opens up new perspectives in community ecology, allowing assessment of such complex mechanisms as passive selectivity, complementary feeding and competition.