Poiani Aldo
Department of Zoology, La Trobe University, 3083, Bundoora, Victoria, Australia.
Oecologia. 1992 Dec;92(3):429-441. doi: 10.1007/BF00317470.
The hypothesis that cooperative breeding entails a cost in terms of transmission of ectoparasites was tested by a comparative analysis among sympatric Australian passerines. The general trend found using the allometry method and outgroup analysis indicates that contagious ectoparasites are not more common on cooperatively breeding than on non-cooperatively breeding hosts. Body weight, migratory patterns and relative abundance of hosts are factors far more important than cooperative breeding that affect the levels of ectoparasitism in the host genera studies. Ectoparasitism increases with host body weight and relative adundance, while sedentary host genera tended to show less hippoboscid fly diversity than migratory host genera. There is an interaction between breeding system and migratory pattern when relative density of contagious ectoparasites (i.e. mites, ticks and bird lice) is considered: the number of contagious ectoparasites per host is larger on cooperatively breeding host genera than on non-cooperatively breeding host genera among sedentary passerines, but the trend is reversed for migrant passerines.
通过对同域分布的澳大利亚雀形目鸟类进行比较分析，检验了合作繁殖在体外寄生虫传播方面会带来成本的假设。使用异速生长法和外类群分析得出的总体趋势表明，传染性体外寄生虫在合作繁殖鸟类身上并不比在非合作繁殖宿主身上更常见。宿主的体重、迁徙模式和相对丰度是比合作繁殖更为重要的因素，它们影响着所研究宿主属中的体外寄生虫感染水平。体外寄生虫感染率随宿主体重和相对丰度的增加而上升，而定居宿主属的虱蝇多样性往往低于迁徙宿主属。在考虑传染性体外寄生虫（即螨类、蜱类和鸟虱）的相对密度时，繁殖系统和迁徙模式之间存在相互作用：在定居雀形目鸟类中，合作繁殖宿主属的每只宿主身上的传染性体外寄生虫数量比非合作繁殖宿主属的多，但在迁徙雀形目鸟类中，这种趋势则相反。
