Within-host speciation events in yoyo clams, obligate commensals with mantis shrimps, including one that involves a change in microhabitat and a loss of specialized traits

Within-host speciation events in yoyo clams, obligate commensals with mantis shrimps, including one that involves a change in microhabitat and a loss of specialized traits
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溜溜蛤的宿主内物种形成事件,与螳螂虾的专性共生,包括涉及微生境变化和特殊性状丧失的事件

DOI:
10.1093/biolinnean/bly044
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发表时间:
2018
影响因子:
1.9
通讯作者:
O'Foighil D
O'Foighil D
中科院分区:
生物学2区
文献类型:
--
作者:
Goto R;Harrison TA;O'Foighil D

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与宿主转移相比,在海洋系统中,宿主内的分支发生在共生体多样化中的重要性仍然不太清楚。Yoyo蛤(Galeommatidae:Vasconiellinae)是一种海洋双壳类动物,与穴居螳螂虾共生。几乎所有的溜溜蛤都是通过一个专门的悬挂脚结构来附着在宿主的洞穴壁上,该结构具有一个线状的后部延伸。相比之下,Parabornia squillina(Vasconiellinae)byssally直接附着在宿主虾上,缺乏悬挂的脚结构。在这项研究中,我们检查vasconiellines之间的系统发育关系进行分子分析的基础上五个基因(28S和16S rRNA,H3,COI和ANT)。我们发现了两个内的主机物种形成事件与相同的螳螂虾主机,Lysiosquilla scabricauda之间的Floridian vasconiellines besisal的证据。其中一个涉及到一个神秘的姐妹物种对洞穴壁musicalsals。另一个是外胚层。squillina和它的有点意想不到的姐妹分类群,洞穴壁的divariscintilla adjacentaculata。后者的结果表明,栖息地从主机洞穴壁主机体表发生转移,同时保留相同的主机物种,并导致专门的吊脚结构的损失。我们的研究结果表明,表面上温和的宿主内生态变化可能导致这些蛤蜊的主要形态变化。
Compared to host shifts, the importance of within-host cladogenesis in the diversification of symbionts remains less well understood in marine systems. Yoyo clams (Galeommatidae: Vasconiellinae) are a clade of marine bivalves that live commensally with burrowing mantis shrimp. Almost all yoyo clams byssally-attach to the host burrow wall via a specialized hanging foot structure bearing a thread-like posterior extension. In contrast,Parabornia squillina(Vasconiellinae) byssally-attaches directly to the host shrimp and lacks a hanging foot structure. In this study, we examine phylogenetic relationships among vasconiellines by performing molecular analyses based on five genes (28S and 16S rRNA,H3,COIandANT). We found evidence for two within-host speciation events among Floridian vasconiellines commensal with the same mantis shrimp host,Lysiosquilla scabricauda. One involved a cryptic sister species pair of burrow-wall commensals. The other involved the ectocommensalP. squillinaand its somewhat unexpected sister taxon, the burrow-wall commensalDivariscintilla octotentaculata. This latter result suggests that a habitat shift from host burrow wall to host body surface occurred while retaining the same host species and led to the loss of the specialized hanging foot structure. Our findings suggest that ostensibly modest within-host ecological shifts can lead to major morphological changes in these clams.
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发表时间: 1998-12-01
影响因子: 4
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