The trophic importance of epiphytic algae in a freshwater macrophyte system (Potamogeton perfoliatus L.): stable isotope and fatty acid analyses.

Jaschinski, Sybill, Brepohl, Daniela C. and Sommer, Ulrich (2011) The trophic importance of epiphytic algae in a freshwater macrophyte system (Potamogeton perfoliatus L.): stable isotope and fatty acid analyses. Aquatic Sciences, 37 . pp. 91-101. DOI 10.1007/s00027-010-0163-6.

[img] Text
AquatSci.pdf - Published Version
Restricted to Registered users only

Download (423Kb) | Contact
[img]
Preview
Text
trophic.pdf - Accepted Version

Download (200Kb)

Supplementary data:

Abstract

Stable isotope and fatty acid analyses were used to study carbon sources for animals in a submerged plant bed. Epiphytes growing on Potamogeton perfoliatus, sand microflora, and alder leaves were the most important carbon sources. The most abundant macrophyte, P. perfoliatus was unimportant as a food source. Modelling (IsoSource) showed that epiphytes were the most important food source for the most abundant benthic invertebrates, the isopod Asellus aquaticus (annual mean contribution 64%), the amphipod Gammarus pulex (66%), and the gastropod Potamopyrgus antipodarum (83%). The mean annual contributions of sand microflora were, respectively, 21, 19, and 9%; and of alder leaves, 15, 15, and 8% for these three species. The relative importance of carbon sources varied seasonally. The relative contribution of epiphytes was lowest for all three grazer species in July: A. aquaticus 38%, G. pulex 43%, and P. antipodarum 42%. A decline in epiphyte biomass in summer may have caused this switch to less attractive food sources. P. perfoliatus provided habitat and shelter for consumers, but food was mainly supplied indirectly by providing space for attached epiphytes, which are fast-growing and provide a highly nutritious food source.

Document Type: Article
Keywords: Food Webs; Epiphytes; Periphyton; Sand microflora; Grazing; IsoSource
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s00027-010-0163-6
ISSN: 1015-1621
Projects: Future Ocean
Date Deposited: 06 Dec 2010 10:16
Last Modified: 26 May 2016 10:32
URI: http://oceanrep.geomar.de/id/eprint/10330

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...