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Seasonal niche overlap and shifts: Implications for coexisting Larimichthys species in the East China Sea

文献类型： 外文期刊

作者： Zhu, Chenxin 1 ; Zhang, Hui 2 ; Zhang, Yi 2 ; Jin, Yan 2 ; Yang, Linlin 2 ; Liu, Zunlei 2 ; Cheng, Jiahua 2 ;

作者机构： 1.Shanghai Ocean Univ, Shanghai 201306, Peoples R China

2.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab East China Sea Fishery Resources Exploitat, Shanghai 200090, Peoples R China

关键词： Species restocking; Ecological niche overlap; Species distribution models; Seasonal habitat partitioning

期刊名称：GLOBAL ECOLOGY AND CONSERVATION （ 影响因子：3.4； 五年影响因子：4.3 ）

ISSN：

年卷期： 2025 年 62 卷

页码：

收录情况： SCI

摘要： The large yellow croaker (Larimichthys crocea), a critically endangered marine fish of high economic value in China, suffered severe wild population declines in the 1980s due to overfishing and habitat degradation. Since 2000, habitat protection and large-scale restocking programs have sought to recover this ecologically important species. However, these efforts face ecological challenges, as L. crocea shares habitat and environmental preferences (temperature, salinity, depth) with its sister species, the small yellow croaker (Larimichthys polyactis), raising concerns about interspecific competition. This study quantified their climatic niche overlap using principal component analysis and generalized boosting models, integrating occurrence records and key environmental variables (temperature, salinity, depth, mixed layer thickness) across seasons. Results revealed significant niche overlap, with Schoener's D values ranging from 0.55 (summer) to 0.66 (winter), indicating heightened competition risks during overwintering periods. L. polyactis exhibited broader niche breadth and greater salinity adaptability, whereas L. crocea displayed niche conservatism, relying on stable coastal habitats (40-70 m depths). Seasonal drivers differed: mixed layer thickness shaped summer distributions, while temperature and sea surface height dominated winter patterns. Overlap zones (4.73 % of the study area) concentrated in Zhejiang's coastal waters, coinciding with key fishing grounds. Vertical stratification and dietary differences likely reduced direct competition, but L. crocea's narrow niche breadth increases its vulnerability to environmental change. This study advocates for spatially explicit management, including decreased seasonal fishing effort in high-overlap zones and prioritizing restocking in non-overlapping areas. These findings advance understanding of niche-mediated coexistence in marine ecosystems and provide science-based strategies to balance species recovery with sustainable fisheries.

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