长江黄州江段长须黄颡鱼肠道内寄生棘头虫的生态研究
AN ECOLOGICAL STUDY ON ACANTHOCEPHALANS PARASITIC IN THE INTESTINE OF PSEUDOBAGRUS EUPOGON IN HUANGZHOU SECTION OF THE YANGTZE RIVER
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摘要: 解剖检查了133尾捕自长江黄州江段的长须黄颡鱼,发现寄主感染长江丽棘虫的感染率为48.9%,感染强度为5.4(虫/尾),平均密度为2.6(虫/尾),感染鲇异棘虫的感染率为21.8%,感染强度为.(虫/尾),平均密度为1.2(虫/尾),两种棘头虫在长须黄颡鱼种群中均为聚集分布;当两种棘头虫共同寄生在宿主肠道内时,其感染强度和单独感染时相比没有显著差异,但是,各自的生态位宽度均变小;两种棘头虫的正关联关系显著.Abstract: The acanthocephalans parasitic in the intestine of Pseudobagrus eupogon in Yangtze River was reported by Yu Y,Wu H S,1989.However ecological study on acanthocephalans parasitic in the intestine of P.eupogon are so far lacking.For this reason the present study provide a reference material for the control of acanthocephalans epizootis.133 P.eupogon in Huangzhou section of the Yangtze River were collected from June to July,2001.The fish sampled were taken to the laboratory,measured,and dissected.The entire alimentary canal was removed and divided into ten segments based on percentages of the total length from the anterior end.Each segment was carefully checked for acanthocephalans.The number of acanthocephalans in each fish was recorded.The numbers was used to statistics and analyses.The results showed that infection rate of Brentisentis yangtzensis in P.eupogon population was 48.1%,the infection intensity was 5.4(worm/fish)and the mean abundance of parasites was 2.5(worm/fish).The infection rate of Heterosentis parasiluri in the P.eupogon population was 21.8%,the infection intensity was 5.5(worm/fish)and the mean abundance of parasites was 1.2(worm/fish).The distribution of the two acanthocephalans species was all clumped in the host population.When two acanthocephalans species were co parasitic in the intestine of hosts,their intensity of infection rate did not alter obviously though the niche width of each species decreased as compared with sigle species infection. The interspecific correlation of the two acanthocephalans species was positive.
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