Change search
ReferencesLink to record
Permanent link

Direct link
Quantitative estimates of isopod resource utilization using a Bayesian fatty acid mixing model
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. University of Washington, USA.
Show others and affiliations
2014 (English)In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 507, 219-232 p.Article in journal (Refereed) Published
Abstract [en]

Herbivorous primary consumers are a key intermediate trophic linkage between primary production from microalgae, macrophytes, and vascular plants and higher-level consumers. Fatty acid (FA) biomarkers are useful for evaluating trophic interactions in aquatic ecosystems because of clear phylogenetic separation of algal group FA signatures. We used a FA-based Bayesian mixing model (FASTAR) to generate quantitative diet estimates of 3 algal phyla for an intertidal herbivorous isopod, Idotea wosnesenskii, at 6 sites in Puget Sound, Washington, USA. We generated a 'resource library' of FA signatures of isopods fed diverse algal diets in 10-wk feeding trials and used these empirical data to parameterize FASTAR, thus accounting for isopod modification of dietary FA. The FA profiles of fast-growing juvenile Idotea were closely related to the signatures of their diets, and several polyunsaturated FA (PUFA) were highly correlated between diet and consumer (e.g. Sigma C-18 omega 6 + C-18 omega 3, 20:4 omega 6, and 20:5 omega 3). We used the model to characterize individual isopod diet variability within sites and to test whether isopods utilize specific algal phyla preferentially or in similar proportions to algae available in the field. The results identified both variation in resource utilization among individual isopods within certain sites, and site level similarities with total available algal cover. Body mass index of wild isopods was highest at sites where the model indicated high utilization (e.g. >30%) of both green and brown algae and low support from red algae. This novel FA-based mixing model approach demonstrated the potential for quantitative diet estimations of fast-growing aquatic herbivorous consumers.

Place, publisher, year, edition, pages
2014. Vol. 507, 219-232 p.
Keyword [en]
Fatty acids, Idotea wosnesenskii, Feeding trial, Biomarker trophic enrichment, Bayesian mixing model, Quantitative diet estimation
National Category
Biological Sciences
URN: urn:nbn:se:su:diva-107633DOI: 10.3354/meps10860ISI: 000340982100017OAI: diva2:748933


Available from: 2014-09-22 Created: 2014-09-22 Last updated: 2014-09-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
Department of Ecology, Environment and Plant Sciences
In the same journal
Marine Ecology Progress Series
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 151 hits
ReferencesLink to record
Permanent link

Direct link