High-throughput sequencing and fatty acid profile analyses of the Black Amur bream (Megalobrama terminalis) reveal variation in dietary niche associated with geographic segregation

文献类型： 外文期刊

第一作者： Liu, Yaqiu

作者： Liu, Yaqiu;Zhou, Qiong;Liu, Yaqiu;Zhou, Qiong;Liu, Yaqiu;Li, Xinhui;Chen, Weitao;Li, Jie;Liu, Yaqiu;Li, Xinhui;Chen, Weitao;Li, Jie;Feng, Guangpeng;Chen, Fangchan;Li, Jie

作者机构：

关键词： 18S rDNA; dietary niche; fatty acids; feeding strategy; geographic segregation; Megalobrama terminalis

期刊名称：ECOLOGY AND EVOLUTION （ 影响因子：2.6； 五年影响因子：3.0 ）

ISSN： 2045-7758

年卷期： 2024 年 14 卷 4 期

页码：

收录情况： SCI

摘要： Fish dietary niche is a core focus, and it reflects the diversity of resources, habitats, or environments occupied by a species. However, whether geographic segregation among different populations triggers dietary diversification and concomitant fish niche shift remains unknown. In the present study, we selected the Black Amur bream (Megalobrama terminalis) is a migratory fish species that plays an important role in the material transfer and energy cycling of river ecosystems, inhabiting southern China drainage with multiple geographic populations. Here, we utilized the combined analyses of 18S rDNA high-throughput sequencing in fish gut contents and fatty acid (FA) in muscle tissues to evaluate potential spatial patterns of habitat and resource use for M. terminalis in three rivers of southern China. Our results showed that prey items of the Xijiang (XR) population (Pearl River) exhibited the highest species diversity and richness among the three geographic populations. Moreover, diet composition of M. terminalis was affected by spatial differences associated with geographic segregation. Analyses of FA biomarkers indicated that the highest levels of C16:0, C18:3n-3, and C18:2n-6c were found in Wanquan (WS) population (Wanquan River). The XR population exhibited a distinct FA profile characterized by higher amounts of arachidonic acid (ARA) and docosahexaenoic acid (DHA). The Moyang (MY) population (Moyang River) acted as the linkage between WS and XR populations and consisted of middle levels of saturated FAs (SFAs) and polyunsaturated FAs (PUFAs). The XR population displayed a greater FA niche width compared with WS population. Furthermore, we observed a close positive relationship between the niche width and alpha-diversity indices of dietary resources for FA proflies. Our study provides valued information to develop different conservation strategies among different populations and improve fisheries management for M. terminalis and other endemic species in local rivers.

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