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ID: 576014.0, MPI für Evolutionsbiologie / Ecophysiology
The potential of methanotrophic bacteria to compensate for food quantity or food quality limitations in Daphnia
Authors:Deines, Peter; Fink, Patrick
Date of Publication (YYYY-MM-DD):2011-12-13
Title of Journal:Aquatic Microbial Ecology
Journal Abbrev.:Aquat Microb Ecol
Issue / Number:2
Start Page:197
End Page:206
Review Status:not specified
Audience:Not Specified
Abstract / Description:The endpoint of anaerobic degradation of organic compounds in aquatic ecosystems
is methane. This methane-carbon is not necessarily lost for ecosystem processes as it can be utilized
by methane-oxidizing bacteria (MOB), and possibly recycled into benthic and pelagic food
webs. The dominant zooplankton in many lakes are daphnids, which could act as vectors for channeling
methane-carbon from methanotrophic bacteria upwards in the food chain. We demonstrate,
using 13C-enriched diets in laboratory experiments, that methane-carbon can enter the
pelagic food web via filtration of MOB by cladoceran zooplankton. Because carbon use efficiency
in Daphnia appears to be limited by the availability of dietary sterols on prokaryotic diets, we test
the hypothesis that the uptake of MOB, the only prokaryotes possessing sterols and sterol-like
compounds, can lead to a quantitative and qualitative upgrading of phytoplankton diets of Daphnia.
Our results confirm the general superiority of eukaryotic over prokaryotic food sources for
Daphnia growth and reproduction. Although MOB addition compensated for limited food quantity,
we found no evidence for a qualitative upgrading through MOB. Consequently, there was no
direct relationship between the quantity of food available and the fitness (somatic growth) of
Daphnia, but rather a strong food quality effect, independent of MOB addition. Our findings support
the view that methane is an important carbon source to pelagic ecosystems and thus have
strong implications for qualitative and quantitative assessments of carbon recycling pathways in
aquatic ecosystems
Free Keywords:Daphnia; Methanotrophs; Sterols; Hopanoids; Stable isotopes
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/Abt. Ökophysiologie
External Affiliations:Institute of Natural Sciences, Massey University, The Station Crescent, Albany Highway, Auckland 0632, New Zealand; Cologne Biocenter, Workgroup for Aquatic Chemical Ecology, University of Cologne, Zülpicher Straße 47b, 50674 Köln, Germany
Identifiers:ISSN:0948-3055 (print) [ID-No:1]
ISSN:1616-1564 (online) [ID-No:2]
DOI:10.3354/ame01542 [ID-No:3]
LOCALID:2886/S 39230 [Listen-Nummer/S-Nummer]
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