Janovy J, McDowell M A, Ferdig M T
School of Biological Sciences, University of Nebraska-Lincoln, 68588-0118.
J Parasitol. 1991 Oct;77(5):697-702.
Distribution of a monogenean parasitic helminth Salsuginus thalkeni on the gills of the fish Fundulus zebrinus is described by calculation of mean positions and niche breadths on the linear spatial resource gradients gill filament length, gill arch length and arch number. All distributions are given for parasites in the presence and absence of various combinations of potential competitors, namely the 6 other parasite species that occupy the same host species. Filament niche breadth was narrowest in the absence of potential competitors; breadth on arch was widest in the presence of potential competitors. Breadth on both resources was correlated positively with mean number of parasites per individual. Arch breadth exhibited cyclic seasonal changes, being lowest in early to mid-summer. Mean position exhibited no repeated pattern of variation on either resource. The results are considered consistent with predictions about the niche structures of species in unsaturated noninteractive specialist communities.
通过计算线性空间资源梯度（鳃丝长度、鳃弓长度和鳃弓数量）上的平均位置和生态位宽度，描述了单殖吸虫寄生蠕虫塔尔肯斯盐蛭在斑马底鳉鳃上的分布情况。所有分布情况均针对存在和不存在潜在竞争者各种组合时的寄生虫给出，这些潜在竞争者即占据同一宿主物种的其他6种寄生虫。在没有潜在竞争者的情况下，鳃丝生态位宽度最窄；在有潜在竞争者的情况下，鳃弓上的生态位宽度最宽。两种资源上的生态位宽度均与每个个体的寄生虫平均数量呈正相关。鳃弓生态位宽度呈现周期性季节变化，在初夏至仲夏时最低。平均位置在两种资源上均未表现出重复的变化模式。研究结果被认为与关于不饱和非交互专家群落中物种生态位结构的预测一致。
