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首页> 外文期刊>Parasitology >Density-dependent regulation of fecundity in Syngamus trachea infrapopulations in semi-naturally occurring ring-necked pheasants (Phasianus colchicus) and wild Carrion Crows (Corvus corone)
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Density-dependent regulation of fecundity in Syngamus trachea infrapopulations in semi-naturally occurring ring-necked pheasants (Phasianus colchicus) and wild Carrion Crows (Corvus corone)

机译：半自然出现的环颈野鸡（Phasianus colchicus）和野生腐肉乌鸦（Corvus corone）气管上中华绒螯蟹种群繁殖力的密度依赖性调节

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Previous work has highlighted increased opportunities for the transmission of Syngamus trachea within pheasant release pens, due in part to high levels of environmental contamination around communal areas. Despite this, the distribution of adult worms within their definitive hosts is not significantly different from predicted distributions under Taylor's power law. Therefore, density-dependent processes are probably acting to regulate S. trachea population dynamics. Patterns of nematode fecundity were investigated in a semi-naturally occurring population of ring-necked pheasants (Phasianus colchicus) and a wild population of carrion crows (Corvus carone). Worm length was a reliable indicator of nematode fecundity, and a negative association between mean worm length and mean worm burden was identified within both the species. The stunting of worms at greater parasite densities was present in both immunologically naive and previously exposed pheasants, so is unlikely to be a function of age-dependent acquired immunity. Interestingly, the effect of parasite crowding in the crow population explained more of the variation in mean worm length, apparently driven by a greater mean worm burden when compared with pheasants. The findings of the present study suggest that fecundity is a function of parasite density, i.e. parasite-mediated competition and not host-mediated heterogeneities in immunocompetence.
机译：先前的工作突显了在野鸡释放笔内传播气管上的Syngamus的机会增加，部分原因是公共区域周围的环境污染水平很高。尽管如此，成虫的最终宿主内部的分布与泰勒幂定律下的预测分布没有显着差异。因此，依赖于密度的过程可能在调节气管链球菌种群动态。线虫繁殖力的模式在半自然的环颈野鸡（Phasianus colchicus）和野生的腐肉乌鸦（Corvus carone）种群中进行了调查。蠕虫长度是线虫繁殖力的可靠指标，并且在两个物种中平均蠕虫长度与平均蠕虫负担之间存在负相关关系。幼虫在免疫学上和以前接触过的野鸡中都以较高的寄生虫密度发育迟缓，因此不太可能是年龄依赖性获得性免疫的作用。有趣的是，寄生虫在乌鸦种群中的拥挤解释了更多的平均蠕虫长度变化，这显然是由与鸡相比更大的平均蠕虫负担所驱动的。本研究的发现表明，繁殖力是寄生虫密度的函数，即寄生虫介导的竞争而不是宿主介导的免疫能力异质性。

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