Sex-biased parasitism, seasonality and sexual size dimorphism in desert rodents
Sex-biased parasitism, seasonality and sexual size dimorphism in desert rodents
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DOI：
10.1007/s00442-005-0189-y
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发表时间：
2005-12-01
期刊：
影响因子：
2.7
通讯作者：
Shenbrot, GI
中科院分区：
文献类型：
--
作者：
Krasnov, BR;Morand, S;Shenbrot, GI
我们调查了9种啮齿类动物的跳蚤感染模式的性别差异的季节性，以测试是否性别偏见的寄生在平均丰度，物种丰富度，患病率和聚集水平（a）主机之间和季节之间的变化，（B）与性别大小二型性。在夏季和冬季，Acomys cahirinus，沙鼠和沙鼠的性别大小差异显着，在冬季，只有Acomys russatus，沙鼠dasyurus，沙鼠nanus和Sekeetamys calurus。除A外，两性大小二型均偏向雄性。俄罗斯人对女性有偏见不同季节的宿主间蚤害的性别差异表现不同。性别对平均跳蚤丰度的显着影响，发现在六个主机，平均跳蚤物种丰富度在五个主机和流行在两个主机。在夏季，只有一个主机和冬季在五个主机的男性偏好的寄生。在冬季，A. russatus。性别差异的对数转换方差对对数转换的平均丰度的回归的斜率发生在三个主机。在任何季节，使用传统的回归和独立对比的方法，没有发现性别大小二型和任何寄生虫学参数之间的关系。我们的研究结果表明，性别偏见的寄生是一个复杂的现象，涉及到几个不同的机制。
We investigated seasonality of gender differences in the patterns of flea infestation in nine rodent species to test if sex-biased parasitism in terms of mean abundance, species richness, prevalence and the level of aggregation (a) varies among hosts and between seasons, and (b) is linked to sexual size dimorphism. Sexual size differences were significant in both summer and winter in Acomys cahirinus, Gerbillus pyramidum and Meriones crassus, and in winter only in Acomys russatus, Gerbillus dasyurus, Gerbillus nanus and Sekeetamys calurus. Sexual size dimorphism was male biased except for A. russatus in which it was female biased. Manifestation of sexual differences in flea infestation was different among hosts between seasons. A significant effect of sex on mean flea abundance was found in six hosts, on mean flea species richness in five hosts and on prevalence in two hosts. Male-biased parasitism was found in summer in one host only and in winter in five hosts. Female-biased parasitism occurred in winter in A. russatus. Gender differences in the slopes of the regressions of log-transformed variances against log-transformed mean abundances occurred in three hosts. No relationship was found between sexual size dimorphism and any parasitological parameter in any season using both conventional regressions and the method of independent contrasts. Our results suggest that sex-biased parasitism is a complicated phenomenon that involves several different mechanisms.