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Turkish Journal of Fisheries and Aquatic Sciences 2019, Vol 19, Num, 2     (Pages: 99-107)

Trophic Pathways from Pelagic and Littoral Sources Supports Food Web in A Eutrophic Natural Lake (Lake Zinav, Turkey)

Ekrem Buhan 1 ,Nehir Kaymak 2 ,Senol Akin 3 ,Halit Turan 1

1 Gaziosmanpasa University, Faculty of Agriculture, Department of Fisheries, 60240, Tokat, Turkey
2 Akdeniz University,Faculty of Science, Department of Biology, 07058, Antalya, Turkey
3 Bozok University, Faculty of Agriculture, Department of Fisheries, 66200, Yozgat, Turkey
DOI : 10.4194/1303-2712-v19_2_02 Viewed : 3310 - Downloaded : 3399 Stable isotope analysis was used to determine which basal sources supporting native and invasive cyprinid fishes are important in a dimictic-eutrophic lake (Lake Zinav, Turkey). We sampled potential primary producers (littoral, pelagic sources and detritus), fish and macroinvertebrates from littoral and pelagic zones of the lake during spring and summer in 2013. The relative importance of basal sources assimilated by invasive (Carassiusspp.) and native fishes (Squalius cephalus, Capoeta banarescui,Cyprinu scarpio) was estimated using SIAR mixing model. Consumers such as collector-gatherer (1) (-35.33‰) and S. cephalus, Carassiusspp., and C. carpio had more ¹³C depleted (-32.12, -31.09, -31.54‰, respectively), while C. banarescui, collector-gatherer (2), and etc. had more ¹³C enriched values (-25.03, - 26.55‰, respectively). SIAR and gut contents indicate that main energy sources were highly variable among fishes, three main sources contributed to invasive fish, but littoral sources for C. banarescui, pelagic sources for S. cephalus, and detritus and pelagic sources for C. carpiowere important. Consumer`s biomass were also partially linked to detritus. Our study suggested that all species promoted coupling of pelagic and littoral pathways, and competition for resources among invasive and native fishes was likely to cause resources sharing, and to shift to suboptimal resources. Keywords : Stable isotope analysis, Gut content, Invasive fish, Habitat coupling, Cyprinids