TY - JOUR
T1 - Contribution of organic matter sources to cyprinid fishes in the chany lakeKargat river estuary, western Siberia
AU - Kanaya, Gen
AU - Yadrenkina, Elena N.
AU - Zuykova, Elena I.
AU - Kikuchi, Eisuke
AU - Doi, Hideyuki
AU - Shikano, Shuichi
AU - Mizota, Chitoshi
AU - Yurlova, Natalia I.
PY - 2009/7/28
Y1 - 2009/7/28
N2 - 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 13C 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 (13C-based isotope mixing model: 6697%) via zooplanktonic trophic mediations. In contrast, Cyprinus carpio L., Leuciscus idus L. and Rutilus rutilus L. depended more on macrophytic and/or riparian production (5280%) 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.
AB - 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 13C 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 (13C-based isotope mixing model: 6697%) via zooplanktonic trophic mediations. In contrast, Cyprinus carpio L., Leuciscus idus L. and Rutilus rutilus L. depended more on macrophytic and/or riparian production (5280%) 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.
KW - Food sources
KW - Isotopic mixing model
KW - Macrophytes
KW - Omnivorous fish
KW - Phytoplankton.
KW - δC and δN
UR - http://www.scopus.com/inward/record.url?scp=67651015467&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67651015467&partnerID=8YFLogxK
U2 - 10.1071/MF08108
DO - 10.1071/MF08108
M3 - Article
AN - SCOPUS:67651015467
VL - 60
SP - 510
EP - 518
JO - Marine and Freshwater Research
JF - Marine and Freshwater Research
SN - 1323-1650
IS - 6
ER -