Limited impact of an invasive oyster on intertidal assemblage structure and biodiversity: the importance of environmental context and functional equivalency with native species

Zwerschke Nadescha; Hollyman Philip R.; Wild Romy; Strigner Robin; Turner John R.; King Jonathan W.

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Limited impact of an invasive oyster on intertidal assemblage structure and biodiversity: the importance of environmental context and functional equivalency with native species

机译：入侵牡蛎对潮间带结构和生物多样性的影响有限：环境背景和与本地物种的功能对等的重要性

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Impacts of invasive species are context dependent and linked to the ecosystem they occur within. To broaden the understanding of the impact of a globally widespread invasive oyster, Crassostrea (Magallana) gigas, intertidal surveys were carried out at 15 different sites in Europe. The impact of C. gigas on macro-(taxa surrounding oyster 1 cm) and epifaunal (taxa on oyster 1 cm) benthic communities and alpha and beta-diversity was assessed and compared to those associated with native ecosystem engineers, including the flat oyster Ostrea edulis. Whilst the effect of C. gigas on benthic community structures was dependent on habitat type, epifaunal communities associated with low densities of O. edulis and C. gigas did not differ and changes in benthic assemblage structure owing to the abundance of C. gigas were therefore attributed to the presence of oyster shells. Macrofaunal alpha-diversity increased with C. gigas cover in muddy habitats, while epifaunal alpha-diversity decreased at greater oyster densities. Macrofaunal beta-diversity was greatest at low densities of C. gigas; however, it did not differ between samples without and increased densities of oysters. In contrast, epifaunal beta-diversity decreased with increasing oyster cover. Different environmental contexts enabled more independent predictions of the effect of C. gigas on native communities. These were found to be low and more importantly not differing from O. edulis. This indicates that, at low densities, C. gigas may be functionally equivalent to the declining native oyster in terms of biodiversity facilitation and aid in re-establishing benthic communities on shores where O. edulis has become extinct.

机译：入侵物种的影响取决于环境，并与它们所处的生态系统相关。为了拓宽对全球性入侵牡蛎牡蛎（Crassostrea（Magallana）gigas）的影响的了解，在欧洲的15个不同地点进行了潮间带调查。评估了C. gigas对宏观（牡蛎类群> 1 cm）和表生（牡蛎类群<1 cm）底栖生物群落和α和β多样性的影响，并将其与原生生态系统工程师（包括平坦的）相关联牡蛎可食。尽管C. gigas对底栖生物群落结构的影响取决于栖息地类型，但与低密度O. edulis和C. gigas相关的表生动物群落没有差异，因此由于C. gigas丰富而导致的底栖组合结构发生了变化。归因于牡蛎壳的存在。在泥泞的生境中，大型底栖动物的α-多样性随着长满角C的覆盖而增加，而在较高的牡蛎密度下，大型底栖动物的α-多样性下降。低密度的C. gigas时，大型动物的β多样性最大。但是，没有牡蛎密度和增加牡蛎密度的样品之间没有差异。相反，随着牡蛎覆盖率的增加，表epi的β多样性降低。不同的环境背景使对墨西哥卷柏对当地社区影响的预测更加独立。发现这些含量低，更重要的是与可食的O.edulis没有区别。这表明，在低密度条件下，就生物多样性的促进和在可食稻已经灭绝的海岸上重建底栖动物群落而言，C。gigas在功能上可以等同于下降的牡蛎。

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《Marine biology》 |2018年第5期|89.1-89.13|共13页
作者
Zwerschke Nadescha; Hollyman Philip R.; Wild Romy; Strigner Robin; Turner John R.; King Jonathan W.;
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Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

Bangor Univ, Ctr Appl Marine Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

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4. Chilean needle grass (Nassella neesiana) in the native grasslands of south-eastern Australia: biodiversity effects, invasion drivers andimpact mechanisms [C] . Ian G. Faithfull, Colin Hocking, David A. McLaren Australian Weeds Conferences . 2010

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5. Impacts of marine invasive species on subtidal and intertidal food web dynamics [D] . Rohr, Nicole Elisabeth 2012

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6. Limited impact of an invasive oyster on intertidal assemblage structure and biodiversity: the importance of environmental context and functional equivalency with native species [O] . Nadescha Zwerschke, Philip R. Hollyman, Romy Wild, -1

机译：入侵牡蛎对潮间带结构和生物多样性的影响有限：环境背景和与本地物种的功能对等的重要性
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Limited impact of an invasive oyster on intertidal assemblage structure and biodiversity: the importance of environmental context and functional equivalency with native species

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