Resolving evolutionary changes in parasite life cycle complexity: Molecular phylogeny of the trematode genus Alloglossidium indicates more than one origin of precociousness
Resolving evolutionary changes in parasite life cycle complexity: Molecular phylogeny of the trematode genus Alloglossidium indicates more than one origin of precociousness
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DOI：
10.1016/j.ympev.2018.04.027
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发表时间：
2018-09-01
影响因子：
4.1
通讯作者：
Criscione, Charles D.
中科院分区：
文献类型：
--
作者：
Kasl, Emily L.;Font, William F.;Criscione, Charles D.
在寄生虫学中，复杂生命周期变化的进化原因和结果是至关重要的。然而，数据仍然有限，部分原因是关于生活史模式不同的物种之间的系统发育关系的知识仍然很少。我们介绍了吸虫属Alloglossidium的分子系统发育，它包含了几个表现出早熟(也称为前驱)生命周期(即，在通常被认为是中间宿主的地方成熟)的物种。分子系统发育与以前基于形态和生活史的系统发育假说形成对比。具体地说，在该属的历史早期，以水蚤为最终寄主的早熟生活史进化而来。在剩下的物种中，它们是一个独立的支系，使用ICtalurid鲶鱼的三宿主生活史是祖先。此外，至少还有两个额外的独立进化事件导致了一个早熟的生活史，在这个生命周期中，一只鲶鱼失去了宿主，而一种甲壳类动物被用作最终宿主。我们最后讨论了现有的关于早熟进化的假说，以及寄生虫生命周期的复杂性，可能与在Alloglossidium属观察到的模式有关，也可能与不相关。
The evolutionary causes and consequences of changes in complex life cycles are of central importance in parasitology. However, data remain limited because in part, knowledge on phylogenetic relationships among species that differ in life cycle patterns remains scarce. We present a molecular phylogeny of the trematode genus Alloglossidium, which contains several species that display precocious (a.k.a., progenetic) life cycles (i.e., maturation in what is typically regarded as an intermediate host). The molecular phylogeny contrasts with previous morphological and life-history based phylogenetic hypotheses. In particular, a precocious life cycle wherein leeches are used as final hosts evolved early in the history of the genus. Among the remaining species, which are a separate clade, a three-host life cycle using ictalurid catfishes is ancestral. Furthermore, there are at least two additional independent evolutionary events that lead to a precocious life cycle where a catfish host is lost and a crustacean is used as a final host. We conclude with a discussion on how existing hypotheses on the evolution of precociousness, and parasite life cycle complexity in general, may or may not relate to the patterns observed in genus Alloglossidium.