Parasite abundance, body size, life histories, and the energetic equivalence rule
Parasite abundance, body size, life histories, and the energetic equivalence rule
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DOI：
10.1086/286136
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发表时间：
1998-06-01
影响因子：
2.9
通讯作者：
Read, AF
中科院分区：
文献类型：
--
作者：
Arneberg, P;Skorping, A;Read, AF
如果共同的过程在所有动物之间产生大小-丰度关系，那么在具有不同生态的群体（如寄生虫和自由生活的动物）之间应该观察到类似的模式。我们研究了身体大小之间的关系。生活史性状，和人口密度（感染宿主的密度）线虫寄生哺乳动物。寄生虫的大小和强度与所有其他考虑的寄生虫和宿主因素无关，也与分析类型无关（即，非系统发育或基于系统发育的统计分析，以及跨社区或社区内的统计分析）。没有其他线虫的生活史特征有独立的影响强度。大小-强度关系的斜率一直很浅，在对数-对数尺度上约为-0.20，因此与能量等效规则不一致。在社区内，随着大小范围的增加，斜率向这个全球值收敛。对已发表值的总结表明，在自由生活的动物中，类似的收敛趋势接近-0.75左右的全球值。自由生活的动物之间的大小-丰度关系的陡峭的斜率可能与寄生虫和自由生活的动物之间的生态学的根本差异，虽然这样的概括需要重新检查的大小-丰度之间的关系自由生活的动物的混淆因素，特别是通过使用基于遗传学的统计方法。在任何情况下，我们的分析都警告不要简单地概括动物丰度的模式。
If common processes generate size-abundance relationships among all animals, then similar patterns should be observed across groups with different ecologies, such as parasites and free-living animals. We studied relationships among body size. life-history traits, and population intensity (density in infected hosts) among nematodes parasitizing mammals. Parasite size and intensity were negatively correlated independently of all other parasite and host factors considered and regardless of type of analyses (i.e., nonphylogenetic or phylogenetically based statistical analyses, and across or within communities). No other nematode Life-history traits had independent effects on intensity. Slopes of size-intensity relationships were consistently shallow, around -0.20 on log-log scale, and thus inconsistent with the energetic equivalence rule. Within communities, slopes converged toward this global value as size range increased. A summary of published values suggests similar convergence toward a global value around -0.75 among free-living animals. Steeper slopes of size-abundance relationships among free-living animals could be related to fundamental differences in ecologies between parasites and free-living animals, although such generalizations require reexamination of size-abundance relationships among free-living animals with regard to confounding factors, in particular by use of phylogenetically based statistical methods. In any case, our analyses caution against simple generalizations about patterns of animal abundance.