闽南渔场主要游泳动物时空生态位特征及其影响因素

根据2019—2021年在闽南渔场进行的秋季、冬季、春季和夏季四个航次定点底拖网调查资料,利用相对重要性指数、种群聚集强度、生态位宽度、生态位重叠及冗余分析对主要游泳动物时空生态位特征及其影响因素进行研究。结果表明,(1)调查海域共鉴定出游泳动物214种,主要优势种有18种,优势种存在明显的季节更替现象;夏季优势种的丛生指数和平均拥挤度较高,春季较低;(2)在时间维度上,须赤虾(Metapenaeposis barbata De Haan)生态位宽度最大(0.99), 7组种对时间生态位重叠值等于1.00;在空间维度上,带鱼(Trachurus japonicus Temminck&Schlegel)生态位宽度最大(2.57),空间生态位重叠值超过0.6的种类占71.3%;在时空维度上,带鱼生态位宽度最大(2.45),鹿斑仰口鲾(Leiognathus ruconius Hamilton)与赤鼻棱鳀(Thrissa kammalensis Bleeker)时空生态位重叠值最大(0.94);(3)冗余分析表明,底层温度和底层盐度是影响闽南渔场主要游泳动物时空生态位特征的重要环境因...

SPATIO-TEMPORAL NICHE CHARACTERISTICS AND INFLUENCING FACTORS OF MAJOR NEKTON SPECIES IN MINNAN FISHING GROUND

The spatio-temporal ecological niche characteristics and influencing factors of major nekton species was determined by the relative importance, aggregation intensity, niche width, niche overlap and redundancy analysis based on data from four voyage fixed bottom trawl surveys in October 2019 (autumn), December 2019 (winter), April 2020 (spring) and August 2021 (summer). The results of the study showed that: (1) 214 species of nekton were identified in the surveyed sea area, with 18 dominant species. There is an obvious seasonal turnover of dominant species, with higher aggregation intensity of dominant species in summer and lower in spring. (2) In the temporal dimension, Metapenaeposis barbata had the largest ecotone width (0.99); the niche overlap of seven groups was equal to 1.00; in the spatial dimension, the niche width of Trachurus japonicus was the largest (2.57); the spatial niche overlap value of major nekton species exceeding 0.6 accounted for 71.3%; in the spatio-temporal dimension, Trachurus japonicus had the largest niche width (2.45) and Leiognathus ruconius Hamilton had the largest spatio-temporal niche overlap width (0.94) with Thrissa kammalensis Bleeker. (3) The redundancy analysis showed that bottom temperature and bottom salinity were the key factors affecting the spatio-temporal niche characteristics of the major nekton species in Minnan Fishing Ground.