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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Eretmochelys imbricata shells present a dynamic substrate for a facilitative epibiont relationship between macrofauna richness and nematode diversity, structure and function
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Eretmochelys imbricata shells present a dynamic substrate for a facilitative epibiont relationship between macrofauna richness and nematode diversity, structure and function

机译：Eretmochelys昆虫的贝壳为大型动物群落丰富度与线虫多样性，结构和功能之间的表生关系提供了动态底物

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Although nematodes are the most abundant metazoans in marine environments and present an important biological and ecological model organism to assess marine ecosystem processes and functions, there are in fact very few studies that use nematodes to investigate ecological communities and relationships on "mobile" ecosystems. Arguably one of the most mobile or dynamic marine ecosystems is a sea turtle carapace, hosting tens to hundreds or even thousands of epibiotic organisms; and as the turtle breeds, feeds and migrates, provides an ecosystem that is continuously exposed to changes and potential colonizers. In this study we investigated the nematode communities associated with 19 Hawksbill sea turtle carapaces (Eretmochelys imbricata), and compared nematode structural (composition, richness and diversity) and functional (trophic types and gender/life stages) community parameters with those of other comparable epibiotic substrates (macrophytes, natural and artificial hard substrates) to see whether turtle carapaces are hotspots of nematode diversity and function among substrates suitable for epifauna. We also addressed potential epibiotic macrofauna-nematode interactions by looking at the relationships between macrofauna richness and nematode richness, diversity and community composition. Results suggest that the macrofauna play a bioconstructing role, creating several microenvironments, and thereby enhancing the richness and diversity of the associated nematode assemblages. This was supported by a direct and positive relationship between macrofauna and nematode richness, and implies a genera enrichment process across size classes and phyla. All heterotrophic nematode feeding guilds were recovered from the carapaces, with dominance of predators/omnivores and epistrate feeders. Nematode juveniles dominated in terms of abundance, and a female/male ratio of 1.11 was observed. Nematode richness and diversity were higher than found on other substrates, but feeding guild, gender and life stage structure did not differ compared to nematode communities from all other epibiotic substrates. As a result, we argue that turtle carapaces can be seen as hotspots for nematode biodiversity compared to other epibiotic substrates, but this is not reflected in the function of the nematode community. This study is the first to investigate in detail sea turtle carapace nematode communities, their richness, diversity, trophic and life cycle structure, and potential interactions with their co-epibionts, the macrofauna.
机译：尽管线虫是海洋环境中最丰富的后生动物，并且是评估海洋生态系统过程和功能的重要生物和生态模型生物，但实际上很少有研究使用线虫来调查“移动”生态系统上的生态群落及其关系。可以说，最具流动性或动态性的海洋生态系统之一是海龟甲壳，里面藏有数十至数百甚至数千种表观生物。随着海龟的繁殖，觅食和迁徙，它提供了一个不断暴露于变化和潜在殖民者的生态系统。在这项研究中，我们调查了与19 Hawk海龟甲壳动物（Eretmochelys imbricata）相关的线虫群落，并将线虫的结构（组成，丰富度和多样性）和功能性（营养类型和性别/生活阶段）群落参数与其他可比较的表生生物进行了比较。底物（宏观植物，天然和人工硬底物），以观察龟背甲是否为线虫多样性的热点，并在适合于动物的底物之间发挥作用。我们还通过研究大型动物的丰富度与线虫的丰富度，多样性和群落组成之间的关系，探讨了潜在的表生生物大型动物-线虫的相互作用。结果表明，大型动物群起着生物构造作用，创造了几种微环境，从而增强了相关线虫组合的丰富性和多样性。大型动物和线虫丰富度之间存在直接和积极的关系，这支持了这一点，并且暗示了跨大小类别和门的属丰富过程。从食肉动物中恢复了所有异养线虫食肉行会，并以食肉动物/杂食动物和epi食动物为主。线虫幼虫的数量最多，雌雄比例为1.11。线虫的丰富度和多样性高于其他底物，但是与其他所有表观生物底物的线虫群落相比，饲喂行会，性别和生命阶段结构没有差异。结果，我们认为与其他表生生物底物相比，甲壳龟可被视为线虫生物多样性的热点，但这并未反映在线虫群落的功能中。这项研究是第一个详细研究海龟甲壳虫线虫群落，其丰富性，多样性，营养性和生命周期结构以及与它们的共同表皮动物（大型动物）之间潜在相互作用的详细研究。

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