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首页> 外文期刊>Marine biology >Digenean trematodes infecting the tropical abalone Haliotis asinina have species-specific cercarial emergence patterns that follow daily or semilunar spawning cycles
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Digenean trematodes infecting the tropical abalone Haliotis asinina have species-specific cercarial emergence patterns that follow daily or semilunar spawning cycles

机译：感染热带鲍鱼Haliotis asinina的Digenean吸虫具有特定物种的尾cer出现模式，这些模式遵循每日或半月产卵周期

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摘要

Approximately 1-2% of the tropical abalone Haliotis asinina inhabiting Heron Island Reef are infected with opecoelid digeneans. These largely inhabit the haemocoel surrounding the cerebral ganglia and digestive gland-gonad complex, and infected abalone typically have significantly reduced or ablated gonads. Observations of infected abalone reveal two distinct cercarial emergence patterns, one which correlates tightly with the abalone's highly regular and synchronous fortnightly spawning cycle, and the other which occurs in a circadian pattern. The former appears to be a novel emergence strategy not previously observed in digeneans. While the cercariae in all abalone are morphologically indistinguishable, comparison of sequences from the internal transcribed spacer 2 (ITS 2) region of the ribosomal DNA reveals a 5.7% difference between cercariae displaying different emergence patterns, indicating these are two distinct species that probably belong to the same genus. The ITS 2 sequences of the species with the daily emergence pattern are identical to that of an undescribed adult opecoelid from the gut of the barramundi cod, Cromileptes altivelis. Combined molecular, morphological and emergence data suggest that while these opecoelid cercariae use the same first intermediate host and are closely related spe-cies—members of the genus Allopodocotyle—they fill different ecological niches that are likely to include dif-ferent definitive hosts.
机译：居住在苍鹭岛礁上的热带鲍鱼鲍鱼（Haliotis asinina）中大约有1-2％感染了奥波多利双基因。这些主要栖息在大脑神经节和消化腺-性腺复合体周围的血细胞中，感染的鲍鱼通常具有明显减少或消融的性腺。观察到鲍鱼感染后发现了两种不同的尾car出现方式，一种与鲍鱼高度规则且同步的每两周产卵周期紧密相关，另一种以昼夜节律发生。前者似乎是一种新的出现策略，以前没有在双基因中观察到。尽管所有鲍鱼的尾c在形态上都无法区分，但通过比较核糖体DNA内部转录间隔区2（ITS 2）区域的序列，发现尾displaying之间显示出不同的出现方式的差异为5.7％，这表明这是两个不同的物种，可能属于同属。具有每日出芽模式的物种的ITS 2序列与来自澳洲肺鱼鳕鱼Cromileptes altivelis的未描述的成年鸦片的序列相同。结合的分子，形态和涌现数据表明，尽管这些鸦片类尾c使用相同的第一个中间寄主，并且是密切相关的物种（异源异戊二烯属的成员），但它们填补了可能包含不同最终寄主的不同生态位。

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