Parasite-mediated shell alterations in Recent and Holocene sub-Antarctic bivalves
Parasite-mediated shell alterations in Recent and Holocene sub-Antarctic bivalves
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近代和全新世亚南极双壳类中寄生虫介导的壳改变
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
D. Zelaya
中科院分区：
文献类型：
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作者：
C. Ituarte;F. Cremonte;D. Zelaya
抽象的。报道了来自近代亚南极种群和全新世晚期巴塔哥尼亚沉积物的双壳类幼虫引起的壳反应的新数据。贝壳的改变是双殖吸虫感染的痕迹，被发现影响了马尔维纳斯（福克兰）群岛、伯德伍德浅滩、比格尔海峡和火地岛（阿根廷）全新世沉积物的潮间带双壳类种群。涉及的双壳类物种属于 Nuculanidae、Cyamiidae 和 Neoleptonidae 科。这种反应包括内壳表面上非常不寻常的圆顶或冰屋形钙化；这里报道的不同双壳类物种中这种反应的相似性和独特性表明入侵媒介是相同的。根据之前在麦哲伦和亚南极水域的 Gaimardia trapesina（双壳纲，Gaimardiidae）中形态上相同的外壳变化的发现，表明此处报告的痕迹的寄生虫属于裸藻科 Bartolius 属的双殖纲扁形动物物种。这里报道的宿主双壳类属于三个不同的超科，并且具有相似的结晶壳微观结构：结构均质的文石。在回顾了有关双壳类针对双殖纲壳幔反应的现有信息后，假设寄生虫负责模拟它们引起的宿主反应。然而，尽管反应的具体特征取决于寄生虫，但它们可能会受到宿主壳结构的某些特征的限制。
Abstract. New data on shell reactions elicited by larval digeneans in bivalves from Recent sub-Antarctic populations and late Holocene Patagonian deposits are reported. Shell alterations, which are traces of digenean trematode infections, were found affecting intertidal bivalve populations from Malvinas (Falkland) Islands, Burdwood Bank, Beagle Channel, and from Holocene deposits at Tierra del Fuego (Argentina). The bivalve species involved belonged to the families Nuculanidae, Cyamiidae, and Neoleptonidae. Such reactions consisted of quite unusual dome or igloo-shaped calcifications on the inner shell surface; the similarities and uniqueness of this reaction in different bivalve species reported here suggest that the invasive agent is the same. Based on previous findings of morphologically identical shell alterations in Gaimardia trapesina (Bivalvia, Gaimardiidae) from Magellanic and sub-Antarctic waters, it is suggested that the parasites responsible for the traces reported here belong to a digenean platyhelminth species of the Gymnophallidae genus Bartolius. The host bivalves reported here belong to three different superfamilies, and share a similar crystalline shell microstructure: aragonite with homogeneous structure. After a review of the available information dealing with bivalve shell-mantle reactions against digeneans, it is hypothesized that parasites are responsible for the modeling of the host response they elicit. However, although the specific characteristics of the reaction depend on the parasite, they would probably be constrained by some characteristics of the host shell structure.