Trophic state changes can affect the importance of methane-derived carbon in aquatic food webs

Schilder, Jos; van Hardenbroek, Maarten; Bodelier, Paul; Kirilova, Emiliya P.; Leuenberger, Markus; Lotter, André F.; Heiri, Oliver (2017). Trophic state changes can affect the importance of methane-derived carbon in aquatic food webs. Proceedings of the Royal Society B: Biological sciences, 284(1857) The Royal Society 10.1098/rspb.2017.0278

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Methane-derived carbon, incorporated by methane-oxidizing bacteria, has been identified as a significant source of carbon in food webs of many lakes. By measuring the stable carbon isotopic composition (δ13C values) of particulate organic matter, Chironomidae and Daphnia spp. and their resting eggs (ephippia), we show that methane-derived carbon presently plays a relevant role in the food web of hypertrophic Lake De Waay, The Netherlands. Sediment geochemistry, diatom analyses and δ13C measurements of chironomid and Daphnia remains in the lake sediments indicate that oligotrophication and re-eutrophication of the lake during the twentieth century had a strong impact on in-lake oxygen availability. This, in turn, influenced the relevance of methane-derived carbon in the diet of aquatic invertebrates. Our results show that, contrary to expectations, methane-derived relative to photosynthetically produced organic carbon became more relevant for at least some invertebrates during periods with higher nutrient availability for algal growth, indicating a proportionally higher use of methane-derived carbon in the lake's food web during peak eutrophication phases. Contributions of methane-derived carbon to the diet of the investigated invertebrates are estimated to have ranged from 0–11% during the phase with the lowest nutrient availability to 13–20% during the peak eutrophication phase.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Schilder, Johannes Cornelis; van Hardenbroek, Maarten Reinier; Leuenberger, Markus; Lotter, André Franz and Heiri, Oliver

Subjects:

500 Science > 580 Plants (Botany)
500 Science > 530 Physics

ISSN:

1471-2954

Publisher:

The Royal Society

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

03 Aug 2017 14:56

Last Modified:

01 Jul 2018 02:31

Publisher DOI:

10.1098/rspb.2017.0278

PubMed ID:

28637853

Uncontrolled Keywords:

Chironomidae; daphnia; methane; eutrophication; lakes; stable carbon isotopes

BORIS DOI:

10.7892/boris.101556

URI:

https://boris.unibe.ch/id/eprint/101556

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