中国水产科学2017，Vol.24Issue(3)：558-565,8.DOI:10.3724/SP.J.1118.2017.16184
海州湾及邻近海域日本枪乌贼时空分布的异质性
Analysis of temporal and spatial heterogeneity of Japanese squid (Loliolus japonica) in Haizhou Bay and adjacent waters
摘要
Abstract
Numerous commercial fish populations have declined in recent years owing to the impacts of overfish-ing, climate change, environmental pollution, and other factors. However, the cephalopod fishery has continued to develop, including increasing harvests of Japanese squid Loliolus(Nipponololigo) japonica(Hoyle 1885).L. ja-ponica plays an important role in the food web of the Haizhou Bay ecosystem, where it is a primary catch in bot-tom trawls and some net fishing. The species spawns in the bay and adjacent waters annually in early May, and it uses these waters as a nursery ground. Despite the ecological and economic importance of the species, few studies of its spatio-temporal patterns of distribution are available, and spatial autocorrelation of data is often lacking in the studies. Analysis of temporal and spatial heterogeneity in the distribution ofL. japonica in Haizhou Bay and adjacent waters has significance for sustainable utilization and scientific management of this fishery. To study this, we used the survey data of bottom trawls in Haizhou Bay and adjacent waters, collected in 2011, 2013, 2014 and 2015, for spatial analysis of center of gravity and semivariogram plots to investigate temporal and spatial distribu-tion ofL. japonica resource density and average body size. The average mantle length ofL. japonica was larger in spring than in autumn for each of the four sample years, and the average mantle lengths did not significantly differ (P>0.05) for spring, but did significantly differ for autumn, except in 2011 and 2013, 2013 and 2015. TheL. ja-ponica population was distributed throughout Haizhou Bay and its adjacent waters, and local distribution showed no correlation with size. In both spring and autumn, the dominant size class was 20?50 mm mantle length. The resource density ofL. japonica differed significantly (P<0.05) between spring and autumn, except in 2013, and was greater in autumn than in spring. Center of gravity of the resource density changed in opposite directions be-tween spring and autumn: squid weremore concentrated in the autumn than in the spring of each year; yet in both seasons, the resource density was relatively centered in the middle of Haizhou Bay and adjacent waters; differ-ences in center of gravity among the years and seasons were not significant. Spatial heterogeneity in resource density ofL. japonicaappeared to be caused less by randomness than by structural variations. The spatial distri-bution ofL. japonica in the study area displayed a well-organized structure, with medium to strong spatial auto-correlation in 20?30 km.关键词
日本枪乌贼/海州湾/空间自相关/时空分布/异质性Key words
Loliolus japonica/Haizhou Bay/spatial autocorrelation/temporal and spatial distribution/heterogeneity分类
农业科技引用本文复制引用
都煜,徐宾铎,薛莹,任一平,张崇良..海州湾及邻近海域日本枪乌贼时空分布的异质性[J].中国水产科学,2017,24(3):558-565,8.基金项目
海洋公益性行业科研专项经费项目(201305030) （201305030）
青岛海洋科学与技术国家实验室鳌山科技创新计划项目(2015ASKJ02-05). （2015ASKJ02-05）
