额尔齐斯河东方欧鳊温氏指环虫的寄生空间分布特点

来源 :新疆动物学会2014年年会暨学术研讨会 | 被引量 : 0次 | 上传用户:panlihuang
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额尔齐斯河(Irtysh River)是中国唯一一条北冰洋水系的国际河流,也是新疆三大河流 虫(Monogenean)在淡水鱼类寄生虫的区系组成中占有重要地位,其中以指环虫科(Dactylogyridae)类群最为丰富.寄生虫在宿主种群内的分布主要是由宿主的行为、感染期的空间聚集或各个宿主易感性等因素所致,而宿主种群内寄生虫的聚集对流行病学研究意义的重要之处在于测量疾病感染度时宿主种群的取样,特别是每个宿主寄生虫数量有高度变异时.根据种群生态学中衡量种群分布类型的判断方法,表明温氏指环虫种群在各鳃间分布类型均呈聚集分布。温氏指环虫对于宿主鳃片的左右位置没有明显的选择性,分布模式以聚集分布为主,且聚集强度较高,当鳃片的空间越大,其所能容纳的寄生虫数也将越多;另外,额尔齐斯河水域的生态环境及寄生虫的种间竞争对温氏指环虫的分布也有影响,但各因素间的相互关系仍需进一步研究。
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