基于环境DNA技术的浙江中北部近海棘头梅童鱼时空分布特征OA

To elucidate the spatiotemporal distribution pattern of spinyhead croaker(Collichthys lucidus)and its rela-tionship with environmental factors,this study combined environmental DNA(eDNA)techniques with traditional fishe-ry resource surveys to systematically investigate C.lucidus in the central-northern coastal waters of Zhejiang during summer and autumn.The results showed that:(1)C.lucidus exhibited a wider distribution range in autumn,but its eDNA concentrations were lower than those in summer;(2)vertically,eDNA concentrations were higher in bottom waters than those in the middle and surface layers;(3)key environmental factors(water depth,temperature,salinity,dissolved oxygen,chlorophyll a,and chemical oxygen demand)had significant effects on its distribution;and(4)the spatial pattern of C.lucidus eDNA concentration was broadly consistent with the biomass distribution derived from conventional fishery resource surveys.Overall,this study demonstrates that eDNA technology can effectively charac-terize the spatiotemporal distribution of C.lucidus and its responses to environmental drivers,providing a novel techni-cal approach and scientific basis for dynamic resource monitoring,habitat conservation,and sustainable utilization of this species.