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首页> 外文期刊>Marine ecology progress series >Impacts of the invasive grass Spartina anglica on benthic macrofaunal assemblages in a temperate Australian saltmarsh
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Impacts of the invasive grass Spartina anglica on benthic macrofaunal assemblages in a temperate Australian saltmarsh

机译：温带澳大利亚盐沼中入侵性草粉草粉对底栖大型动物群落的影响

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摘要

Reported impacts of the invasive saltmarsh grass Spartina anglica on benthic macrofaunal assemblages around the world vary considerably, and there is little understanding of the reasons for this variation. We compared macrofaunal assemblages and sediment characteristics among patches of S. anglica and adjacent uninvaded habitats (bare mudflat and native saltmarsh) in southeastern Australia. Invaded patches showed reduced species richness (by 50%) and diversity compared to both uninvaded habitats. Macrofaunal abundance in S. anglica patches was also lower than in native marsh (by 60%), but not different from mudflat. There were no differences in biomass among habitats. Ordination clearly separated the species assemblage of invaded patches from uninvaded habitats, suggesting a unique community in the Spartina habitat. Molluscs and crustaceans were the most depleted in S. anglica patches, while the polychaete Nephtys aus-traliensis was enhanced. Infauna and epifauna were both depleted in S. anglica, although the mechanisms for these impacts should differ. Burrowing by infauna in S. anglica patches was likely impeded by dense roots and rhizomes, because the below-ground plant biomass was 72 % greater than in native saltmarsh. Epifauna were likely depleted in S. anglica patches due to shading-induced inhibition of microphytobenthos growth, consistent with measured reductions of porewa-ter salinity and increased mud content. Salinity and mud content were the sediment parameters that correlated most strongly with macrofaunal assemblage composition. These results, combined with a synthesis of published S. anglica impacts, suggest predictions of when S. anglica facilitates or inhibits macrofauna, considering infauna and epifauna separately.
机译：据报道，入侵性盐沼草Spartina anglica对底栖大型动物群落的影响差异很大，对此变化的原因了解甚少。我们比较了澳大利亚东南部S. anglica斑块和相邻的未入侵生境（裸泥滩和天然盐沼）之间的大型动物群落和沉积物特征。与未入侵的生境相比，入侵的斑块显示出物种丰富度（降低了50％）和多样性。 S. anglica斑块中大型动物的丰度也比原生沼泽中的低（60％），但与滩涂没什么不同。生境之间的生物量没有差异。排序清楚地将受侵袭斑块的物种集合与未受侵袭的栖息地分开，这表明在Spartina栖息地中拥有独特的群落。软体动物和甲壳类在S. anglica斑块中消耗最多，而多毛chaNephtys aus-traliensis则得到增强。 S. anglica中的Infauna和Epifauna均已耗尽，尽管产生这些影响的机制应有所不同。浓密的根和根状茎可能会阻止非洲菊科植物中因infauna引起的穴居，因为地下植物的生物量比天然盐沼大72％。由于阴影诱导的对微生底栖细菌的抑制作用，S。anglica斑块中的表皮动物可能被耗尽，这与测得的孔隙度盐度降低和泥浆含量增加相一致。盐度和泥浆含量是与大型动物群组成最密切相关的沉积物参数。这些结果，再加上已发表的链球菌的综合影响，提示了对链球菌何时促进或抑制大型动物群的预测，要分别考虑动物群和表生动物。

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