Anderson J A, Blazek K J, Percival T J, Janovy J
School of Biological Sciences, University of Nebraska-Lincoln 68588-0118.
J Parasitol. 1993 Jun;79(3):435-7.
Distribution of the monogenean Dactylogyrus banghami on the gills of the fish Notropis stramineus (Cyprinidae) was described by calculation of mean relative positions and Levins' niche breadths on the linear spatial resource gradients gill filament length and gill arch length. Thirty fish with 276 worms were examined; only 1 of the fish had an additional gill parasite species (Trichodina sp). Worms were more broadly and evenly distributed across the length of the gill arch than they were on the filament (breadths of 0.91 and 0.67, respectively). Mean worm positions were near the center of both resources: 54% of the distance from the arch cartilage on the filament, and 54% from the ventral end of the arch itself. The results are considered consistent with predictions about the niche structures of species in unsaturated noninteractive specialist communities.
通过计算在鳃丝长度和鳃弓长度这一线性空间资源梯度上的平均相对位置和莱文斯生态位宽度，描述了单殖吸虫孟加拉指环虫在细纹鼻鱼（鲤科）鳃上的分布情况。检查了30条带有276条虫的鱼；只有1条鱼还感染了另一种鳃寄生虫（车轮虫属）。与在鳃丝上相比，虫在鳃弓长度上分布得更广泛且更均匀（生态位宽度分别为0.91和0.67）。虫的平均位置接近两种资源的中心：在鳃丝上距离鳃弓软骨54%的位置，在鳃弓本身上距离腹端54%的位置。这些结果被认为与关于不饱和非相互作用特化群落中物种生态位结构的预测一致。
