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长江春禁期4-6月间,下游江段渔获中出现鱼、虾、蟹共12目、30科、81种.安徽、江苏江段年间物种多样性指数明显上升并趋于稳定,其中Shannon—Wiener(H’与H”)在1.593—2.563范围内呈上升并趋于稳定、Margalef在0.866—2.755范围内呈明显上升、Pielou、Simpson和McNaughton指数在窄幅波动中趋于稳定,波动范围分别为0.717—0.827;0.120—0.269;0.365—0.616.河口区多样性指数正处于波动中,Simpson和McNaughton指数分别从0.195升至0.315;从0.534升至0.758,并有继续上升的趋势.各江段年间捕捞证发放数与ShannonH’的回归分析表明两者呈负相关线型关系.
In spring and spring between 4 and June, 12 fish species, shrimp and crabs were found in the catchments of the lower reaches of the Yangtze River, with a total of 81 families and 81 species, and the species diversity index of Anhui and Jiangsu sections increased significantly and stabilized in the years Shannon-Wiener (H ’and H ") increased and stabilized in the range of 1.593-2.563, while Margalef increased significantly in the range of 0.866-2.755. The Pielou, Simpson and McNaughton indices tended to be stable and fluctuated in a narrow range Ranging from 0.717-0.827, 0.120-0.269 and 0.365-0.616, respectively. The estuarine diversity index is in the process of fluctuating. The Simpson and McNaughton indices rose from 0.195 to 0.315 respectively, from 0.534 to 0.758 and continued to rise. Regression analysis of the number of fishing licenses and Shannon H ’during the year indicated that the two were negatively correlated.