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Water 2018, 10(5), 602; https://doi.org/10.3390/w10050602

Spatial Variation in Trophic Structure of Dominant Fish Species in Lake Dongting, China during Dry Season

1
College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
2
Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
3
School of Life Sciences, Nanchang University, Nanchang 330031, China
4
Current address: Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Key Laboratory of Health Aquaculture and Product Processing in Dongting Lake Area of Hunan Province, Hunan University of Arts and Science, Changde 415000, China
5
Current address: IDG/McGovern Institute for Brain Research at Tsinghua, School of Life Science, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Received: 24 February 2018 / Revised: 7 April 2018 / Accepted: 25 April 2018 / Published: 5 May 2018
(This article belongs to the Section Water Quality and Ecosystems)
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Abstract

Understanding trophic interactions in food webs is crucial to revealing the transfer of substances and energy from primary food sources to consumers in aquatic ecosystems. We hypothesize that the trophic structure of consumers can be significantly affected by primary food sources (pelagic, benthic, and littoral sources) through complex trophic interactions. This study used stable isotope analysis and Bayesian mixing models to estimate the trophic levels of fish consumers and the contributions of primary food sources in the three sub-lakes (Eastern, Southern, and Western Dongting) of Lake Dongting, which have different physical and chemical parameters of water, fish species diversity, and plankton (phytoplankton and zooplankton) density. Results showed the differences in community structures of fish among sub-lakes. Fish trophic levels were significantly higher in Eastern Dongting than those in the two other areas. The contributions of primary food sources to fishes were as follows: the pelagic source was the main basal food source in Eastern Dongting, and littoral and pelagic sources played equally essential roles in Southern Dongting; fishes in Western Dongting relied on more benthic source to growth than those in the two other regions. This study can fill gaps in our knowledge of the influence of the underlying food available on trophic structure of consumers by exploring the role of primary food sources and making the trophic structure of consumers in the aquatic food web highly complicated and diverse through control of the distribution of primary food sources. View Full-Text
Keywords: food webs; primary food sources; environmental heterogeneity; stable isotope food webs; primary food sources; environmental heterogeneity; stable isotope
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Yu, J.; Guo, L.; Zhang, H.; Xu, J.; Hu, H.; Xue, T.; Luo, C.; Yi, C.; Hu, Y.; Silva, K.H.W.L.D.; Xie, P. Spatial Variation in Trophic Structure of Dominant Fish Species in Lake Dongting, China during Dry Season. Water 2018, 10, 602.

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