(1) The Bohai Sea is an important ecosystem for many fishery species, as well as ecologically important species. At the same time, the function of the Bohai Sea ecosystem is increasingly influenced by various anthropo...
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(1) The Bohai Sea is an important ecosystem for many fishery species, as well as ecologically important species. At the same time, the function of the Bohai Sea ecosystem is increasingly influenced by various anthropogenic disturbances along with climate change in many ways. (2) The structural patterns and the seasonal dynamics of fishery species were studied in the Bohai Sea. A total of 88 fisheries species belonging to 64 families were recorded, in detail 43 fishes, 29 crustaceans, 12 molluscas, three echinoderms, and one species of scyphozoan. Among them, 21 species commonly found throughout the study period were defined as ‘common’ species, and eight species of those that were the highest contributors defined as‘dominant’ species (based on SIMPER analysis, their cumulative contribution was more than 70%). Maximum abundance was recorded in the summer, while species number was higher in both summer and autumn. Among the community parameters, species richness (3.79), diversity (2.31), and Simpson indices (0.88) peaked in autumn, whereas species evenness (0.95) was in winter. However, species diversity, evenness, and Simpson indices were lower in summer (0.57, 0.18, and 0.18, respectively) while species richness was in winter (1.65). Multivariate PCoA analysis revealed that there was a significant seasonal variation in fisheries assemblages. Furthermore, ANOSIM (Global R=0.467, P=0.01) indicated a distinct community structure of fishery species between the four seasons. Thus, these results suggested that fisheries assemblages might be influenced by the seasonal dynamics of the ecological condition of the Bohai Sea. (3) Species co-occurrence patterns were used to investigate organisms’ distribution and evaluate the interspecific interactions among the species in the communities. The co-occurrence patterns of 114 fisheries species in the Bohai Sea were investigated based on fishery-independent data (i.e., a pair of trawlers) during four seasons: winter (January-Febr
以粤北车八岭2008年受冰灾破坏的山地常绿阔叶林为研究对象，设置2 hm2固定样地开展连续3 a （2008-2010年）的乔木群落调查，研究冰灾对亚热带森林更新演替的影响。结果发现：（1）样地优势乔木树种受灾程度由高到低依次为：栲树＞鸭...
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以粤北车八岭2008年受冰灾破坏的山地常绿阔叶林为研究对象，设置2 hm2固定样地开展连续3 a （2008-2010年）的乔木群落调查，研究冰灾对亚热带森林更新演替的影响。结果发现：（1）样地优势乔木树种受灾程度由高到低依次为：栲树＞鸭公树＞米槠＞石栎＞木荷＞栓叶安息香＞微毛山矾＞华南桂＞香楠＞尾尖叶柃；2）冰灾后3 a冠层乔木群落总个体数先增加后减少，其变动主要来源于乔木幼树，但区系成分和多样性变化不大；3）乔木径级越小其个体数越多、年间变化越大，乔木从小径级到大径级的成长过程中死亡率的总体趋势在下降；4）样地中整个乔木群落是呈聚集分布的，乔木从小树到大树是从聚集分布到随机分布再到均匀分布的变化过程，并且2009和2010年的乔木群落分布格局更相近。
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