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首页> 外文期刊>Marine biology >Microsporidia infections in the amphipod, Echinogammarus marinus (Leach): suggestions of varying causal mechanisms to intersexuality
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Microsporidia infections in the amphipod, Echinogammarus marinus (Leach): suggestions of varying causal mechanisms to intersexuality

机译：两栖纲，棘手棘球（（浸出）中的微孢子虫感染：对两性恋的各种因果机制的建议

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摘要

A notable body of research has established a clear link between intersexuality and the feminising influence of microsporidia infection in amphipods. In this study, we investigated the relationship between microsporidia infection and intersexuality in the amphipod Echinogammarus marinus (Leach) from Portsmouth, southern England. The analysis revealed a male-biased population (～2:1) harbouring both Dictyocoela berillonum and Dictyocoela duebenum microsporidia, with ~38 and 6% of animals displaying 'high' levels of infection, respectively. We also reveal the presence of several intersex phenotypes: intersex females (1%) that possess genital papillae. Two male intersex phenotypes-internal intersex (8.2%), possessing an oviduct structure on their testes, and external intersex males (4.4%), which possess external brood plates. We found a statistically significant relationship between D. berillonum infection and the external intersex male phenotype; however, the male-biased population and low levels of female infection suggest that the correlation may not be the result of incomplete feminisation. In addition, we found that the internal and external intersex characteristics are rarely seen on the same specimen, suggesting that the male intersex phenotypes are caused by distinct mechanisms. In combination, these findings are suggestive of a more complex relationship between amphipod intersexuality and their microsporidia than had previously been recognised.
机译：著名的研究机构在两性动物的两性恋与微孢子虫感染的女性影响之间建立了明确的联系。在这项研究中，我们调查了来自英格兰南部朴茨茅斯的两栖动物棘纲棘鱼（浸出）中小孢子虫感染与两性之间的关系。分析显示，男性偏见种群（〜2：1）同时携带小球藻和小球藻，其中分别有〜38和6％的动物表现出“高”感染水平。我们还揭示了几种双性表型的存在：双性雌性（1％）具有生殖器乳头。两种雄性间性表型：内部雌性（8.2％），其睾丸具有输卵管结构；和外部雌性雄性（4.4％），其具有外部育雏盘。我们发现D. berillonum感染与外部双性恋男性表型之间存在统计学上的显着关系。但是，男性偏向人群和女性感染率低表明这种相关性可能不是女性化不完全的结果。另外，我们发现在同一标本上很少见到内部和外部的性交特征，这表明男性的性交表型是由不同的机制引起的。综合起来，这些发现暗示了两栖类两性动物与其微孢子虫之间的关系要比以前所认识的更为复杂。

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  • 来源
    《Marine biology》 |2011年第2期|p.461-470|共10页
  • 作者

    Gongda Yang; Stephen Short; Peter Kille; Alex T. Ford;

  • 作者单位

    Institute of Marine Sciences, School of Biological Sciences,University of Portsmouth, Ferry Road, Portsmouth,Hampshire PO4 9LY, UK,Environmental Research Institute, North Highland College,UHI Millennium Institute, Castle Street, Thurso, Caithness,Scotland KW14 7JD, UK;

    Institute of Marine Sciences, School of Biological Sciences,University of Portsmouth, Ferry Road, Portsmouth,Hampshire PO4 9LY, UK;

    School of Biosciences, University of Wales Cardiff,Main Building, Museum Avenue, Cardiff, Wales CF10 3TL, UK;

    Institute of Marine Sciences, School of Biological Sciences,University of Portsmouth, Ferry Road, Portsmouth,Hampshire PO4 9LY, UK;

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