摘要
2001年2月到2002年7月,对湖北省梁子湖黄颡鱼的胃部寄生蠕虫进行了调查,共发现4种寄生蠕虫,即:黄颡前驼形线虫(Procamallanus fulvidraconis)、杜父鱼驼形线虫(Camallanus cotti)、黄颡刺盖线虫(Spinitectus gigi)和河鲈源吸虫(Genarchopsis goppo),本文主要报道了黄颡前驼形线虫的频率分布,以及河鲈源吸虫的季节动态和频率分布。黄颡前驼形线虫的感染率为96.70%,平均丰度为21.59±23.37,方均比为25.29,与负二项分布拟合不成功(p<0.001),没有发现表示"宿主年龄-寄生虫丰度"之间关系的凸形曲线,寄生虫丰度与宿主年龄和体长之间都呈显著的正相关关系(Rx,y=0.3038,p<0.001;Rx,y=0.3938,p<0.001);河鲈源吸虫的感染率为48.61%,平均丰度为2.45±5.44,方均比为12.09,与负二项分布拟合成功(p=0.29),其"宿主年龄-寄生虫丰度"之间的关系呈凸形曲线,并且伴随着聚集度的下降,感染丰度与宿主年龄和体长都呈显著的正相关关系(Rx,y=0.1694,p<0.001;Rx,y=0.2449,p<0.001)。河鲈源吸虫感染的高峰期发生在春季、晚秋和初冬,各月份间的感染率和平均丰度都有显著的差异(G=93.4>χ20.05[17]=27.58;F=16.7,p<0.001)。寄生虫本身的生活史模式可能是引起河鲈源吸虫显著季节变化的主要原因。
Helminths in the stomach of the yellowhead catfish Pelteobagrusfulvidraco （Richardson） in the Liangzi lake of Hubei Province were investigated from February 2001 to July 2002. Three nematode species Procamallanus fulvidraconis, Camallanus cotti, Spinitectus gigi and a trematode Genarchopsis goppo were found. The latter two nematode species, with very low infection level, were not included in the further analysis as follows. Frequency distribution of P .fulvidraconis and the seasonal changes and frequency distribution of G. goppo were analyzed. Prevalence, mean abundance （ ＋ SD） and variance to mean ratio of P.fulvidraconis were 96.70%, 21.59 ± 23.37 and 25.29, respectively. Its frequency distribution could not be described by the negative binomial model. There were positive correlations between abundance of P.fulvidraconis and the fish age and length （Rx,y = 0. 3038, p 〈 0.001 ; R x. y = 0. 3938, p 〈 0.001 ） , and convex curve of fish age- parasite was not detected. Prevalence, mean abundance （ ± SD） and variance to mean ratio of G. goppo were 48.61% ,2,45 ± 5.44 and 12.09, respectively. Its frequency distribution fitted well with the negative binomial model. Abundance of G. goppo was also significantly correlated with fish age and length （ Rx,y = 0. 1694, p 〈 0.001 ; Rx,y = 0. 2449, p 〈 0.001 ）, but a peaked age-parasite curve was detected, concomitant with decrease of aggregation degree. Peaks of infection of G. goppo were observed in spring, late autumn and early winter, and significant difference of prevalence and mean abundance among months was found （ G = 93.4 〉 x0.05^2[17] = 27.58; F = 16.7, p 〈 0.001 ）.The pattern of life history may be the cause of the seasonal changes of the parasite. Relationship between the yellowhead catfish and the two parasites was also discussed in the study.
出处
《水生生物学报》
CAS
CSCD
北大核心
2008年第2期195-200,共6页
Acta Hydrobiologica Sinica
基金
“973”项目(2002CB412308)
湖北省科技攻关计划项目(2007AA203A01)资助
关键词
黄颡鱼
寄生虫
种群动态
频率分布
Yellowhead catfish
Pelteobagrus fulvidraco
Helminths
Population dynamics
Frequency distribution
