Trophic niche variation driven by water level fluctuations facilitates the co-occurrence of invasive tilapia species in a subtropical reservoir in China.

Autor: Yang L; Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.; University of Chinese Academy of Sciences, Beijing, China., Liao C; Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.; University of Chinese Academy of Sciences, Beijing, China., Ji X; Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.; University of Chinese Academy of Sciences, Beijing, China., Chen X; Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.; University of Chinese Academy of Sciences, Beijing, China., Guo M; Water Resources Allocation Center of the Quanzhou Shanmei Reservoir, Quanzhou, China., Zhang G; Water Resources Allocation Center of the Quanzhou Shanmei Reservoir, Quanzhou, China., Neves MP; Department of Zoology, Federal University of Paraná, Curitiba, Brazil.; Rice University, Houston, Texas, USA., Wang Y; Xiamen Raw Water Investment and Operation Co., Ltd, Xiamen, China., Zhang H; Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.; University of Chinese Academy of Sciences, Beijing, China., Guo C; Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.; University of Chinese Academy of Sciences, Beijing, China., Liu J; Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.; University of Chinese Academy of Sciences, Beijing, China.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2024 Dec 08. Date of Electronic Publication: 2024 Dec 08.
DOI: 10.1111/jfb.16019
Abstrakt: Investigating how multiple invasive fish species with similar ecological traits respond to different environmental conditions is crucial to understanding their successful invasion and coexistence. Here, we used stomach content analysis and stable isotope analysis to analyse the effects of water level fluctuation on the trophic niche plasticity of three dominant co-occurring invasive tilapia species (Coptodon zillii, Sarotherodon galilaeus, and Oreochromis niloticus) in the Shanmei Reservoir, southern China. We found that the tilapia species exhibited an iliophagous habit with dietary variations between the high-water (HW) and low-water (LW) level periods. During the LW period, tilapia fishes primarily fed on periphytic algae, whereas during the HW period, they reduced their consumption of epiphytic algae and increased their intake of plant remains. Biofilms were the most assimilated resource by the species during the LW period, whereas riparian plants dominated during the HW period. The niche width and niche overlap of the three tilapia species were significantly greater in the HW period than in the LW period. However, their trophic positions were not significantly affected by water level fluctuations. Our findings indicate that temporal variation in diet composition and trophic niche, driven by water level fluctuations, may favor food resource partitioning and facilitate the coexistence of these invasive tilapia species.
(© 2024 Fisheries Society of the British Isles.)
Databáze: MEDLINE
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