Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Contribution of organic matter sources to cyprinid fishes in the Chany Lake–Kargat River estuary, western Siberia

Gen Kanaya A E F , Elena N. Yadrenkina B , Elena I. Zuykova B , Eisuke Kikuchi A , Hideyuki Doi C , Shuichi Shikano A , Chitoshi Mizota D and Natalia I. Yurlova B

A The Center for Northeast Asian Studies, Tohoku University, Sendai 980-8576, Japan.

B Institute of Systematics and Ecology of Animals, SBRAS, Novosibirsk, Russia.

C Institute for Chemistry and Biology of the Marine Environment, Carl-von-Ossietzky University Oldenburg, Wilhelmshaven, Germany.

D Faculty of Agriculture, Iwate University, 3-18-8, Ueda, Morioka 020-8550, Japan.

E Present address: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan.

F Corresponding author. Email: gen@nies.go.jp

Marine and Freshwater Research 60(6) 510-518 https://doi.org/10.1071/MF08108
Submitted: 2 April 2008  Accepted: 3 December 2008   Published: 19 June 2009

Abstract

Although omnivorous cyprinid fish often dominate fish communities in shallow eutrophic lakes, their role in the food web is poorly known. In the present study, carbon sources of six cyprinid species were examined in a littoral freshwater habitat in a saline lake complex (Lake Chany, western Siberia, Russia) using stable isotope analyses (SIA). In this habitat, microalgae (phytoplankton and epiphytes), macrophytes and riparian vegetation comprised the major producer groups with distinctive δ13C values. Zooplankton and most benthic invertebrates functioned primarily as microalgae-based consumers, whereas the amphipod Gammarus lacustris depended largely on macrophytes or macrophyte-derived detritus. Cyprinids, Carassius carassius L., Car. auratus gibelio Bloch. and Abramis brama L., mainly utilised microalgae-derived carbon (δ13C-based isotope mixing model: 66–97%) via zooplanktonic trophic mediations. In contrast, Cyprinus carpio L., Leuciscus idus L. and Rutilus rutilus L. depended more on macrophytic and/or riparian production (52–80%) than on microalgal production. Observations and SIA of foregut contents indicated highly opportunistic feeding habits of R. rutilus and L. idus and preference for macrophytes. These results suggested that cyprinid fishes link pelagic, benthic and riparian food webs in this shallow, eutrophic lake ecosystem.

Additional keywords: δ13C and δ15N, food sources, isotopic mixing model, macrophytes, omnivorous fish, phytoplankton.


Acknowledgements

We thank Dr K. Ito for use of the mass spectrometer (Department of Agriculture, Tohoku University) and Dr A.K. Yurlov for his support throughout the research. M. Yadrenkin, Y.A. Scherbakov, O.N. Popova, and S. Takagi are acknowledged for their help in field and laboratory work. We also thank Dr A. Boulton and two anonymous referees for their critical comments on this manuscript. This study was supported partly by KAKENHI (No. 16405005, 19405008) from JSPS. All experiments and sampling complied with the current laws in the Russian Federation.


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