Trophic niche and interspecific diet relationship of Gymnocypris in autumn from Langcuo Lake of Tibet, China.

doi:10.13287/j.1001-9332.202012.034

Abstract

Abstract: Langcuo Lake is a typical plateau lake in the southern Tibet, with an altitude of 4300 m. Gymnocypris chui and Gymnocypris scleracanthus coexisted in this lake. In this study, we investigated the food composition and trophic niche of two Gymnocypris fishes in autumn by carbon and nitrogen stable isotopes technique in 2018. We further analyzed their interspecific diet relationship, including the diet similarity index and overlap coefficient. The results showed that G. chui mainly feed on ephemeroptera larvae, chironomidae larvae, periphytic algae, gammarus and plankton, while G. scleracanthus mainly feed on ephemeroptera larvae, periphytic algae, chironomidae larvae, gammarus and aquatic vascular plants. Two Gymnocypris fishes had trophic niche overlap. The δ¹³C range value (CR=1.60), δ¹⁵N range value (NR=1.89), and total area of convex hull (TA=1.80) of G. chui were lower than those of G. scleracanthus, with the difference values being 0.09, 0.57 and 1.29, respectively. The diet similarity index and overlap coefficient of those two species were higher, with a value of 94.2% and 91.5%, respectively. Our results suggested that the interspecific diet competition may be intense between the G. chui and G. scleracanthus in Langcuo Lake in autumn.

Key words: Plateau lake, Gymnocypris chui, Gymnocypris scleracanthus, food composition, food overlap.

LI Lei, JIN Xing, MA Bo, WU Song, TANG Shi-zhan. Trophic niche and interspecific diet relationship of Gymnocypris in autumn from Langcuo Lake of Tibet, China.[J]. Chinese Journal of Applied Ecology, 2020, 31(12): 4284-4290.

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