Does the niche breadth or trade-off hypothesis explain the abundance-occupancy relationship in avian Haemosporidia?
Does the niche breadth or trade-off hypothesis explain the abundance-occupancy relationship in avian Haemosporidia?
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DOI：
10.1111/mec.12744
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发表时间：
2014-07-01
影响因子：
4.9
通讯作者：
Voelker, Gary
中科院分区：
文献类型：
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作者：
Drovetski, Sergei V.;Aghayan, Sargis A.;Voelker, Gary
已经提出了两个假设来解释寄生虫的丰度-占用关系(AOR)。生态位宽度假说表明，寄主多面手在殖民不同寄主群落方面比专家更丰富和有效。权衡假说认为，宿主专家在宿主范围内实现了高密度，而多面手则承担了适应不同免疫防御系统的高昂成本。我们利用从非洲西北部、伊比利亚西北部、大高加索西部和外高加索地区采集的103种2318只鸟类的386个血孢子虫细胞色素b谱系(1894个序列)来验证这些假设。血统所占区域的数量与它们的频率相关，这表明AOR在禽类血孢子虫中存在。然而，两种假说都没有为AOR提供更好的解释。尽管寄主通用疟原虫SGS1的丰度是其他广泛分布的谱系的三倍以上，但寄主专家和通用疟原虫都成功地定植了所有研究地区，并实现了较高的总流行率。
Two hypotheses have been proposed to explain the abundance-occupancy relationship (AOR) in parasites. The niche breadth hypothesis suggests that host generalists are more abundant and efficient at colonizing different host communities than specialists. The trade-off hypothesis argues that host specialists achieve high density across their hosts' ranges, whereas generalists incur the high cost of adaptation to diverse immuno-defence systems. We tested these hypotheses using 386 haemosporidian cytochrome-b lineages (1894 sequences) recovered from 2318 birds of 103 species sampled in NW Africa, NW Iberia, W Greater Caucasus and Transcaucasia. The number of regions occupied by lineages was associated with their frequency suggesting the presence of AOR in avian Haemosporidia. However, neither hypothesis provided a better explanation for the AOR. Although the host generalist Plasmodium SGS1 was over three times more abundant than other widespread lineages, both host specialists and generalists were successful in colonizing all study regions and achieved high overall prevalence.