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Modified kelp seasonality and invertebrate diversity where an invasive kelp co-occurs with native mussels

机译：改良的海带季节性和无脊椎动物多样性，其中侵入性海带与本地贻贝同时发生

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摘要

Non-native species have invaded coastal systems worldwide, altering community structures and ecosystem functioning. One of the most widely distributed marine invaders is the kelp Undaria pinnatifida. In Australasia, Undaria is a large annual kelp that typically has a unimodal growth pattern characterized by high cover during late-winter and spring. It is possible that Undaria co-occurs with mussels and impacts the biodiversity of mussel assemblages on rocky reefs, especially given its presence on mussel farms. Here, we tested whether Undaria and mussels co-occurred on rocky reefs at different temporal and spatial scales, and whether Undaria affects the diversity of mussel-associated small mobile invertebrates. Analyses of survey data showed that individuals of Undaria are often attached to, or interspersed around, mussel aggregations in the low intertidal zone where Undaria was found at similar abundances in its typical winter growth and summer senescence seasons. We hypothesize that this unexpected pattern is caused by overlapping generations coupled with longer growing seasons, potentially triggered by localized higher wave action, rather than individual plants persisting for an entire year. Analyses of Undaria holdfasts and non-living mimics of Undaria holdfasts, showed that live and large holdfasts, in particular, alter and increase small-scale diversity of mobile invertebrates where Undaria co-occurs with mussels. We conclude that Undaria has a longer temporal presence where it co-occurs with mussels and that Undaria alter mussel-associated communities of small mobile invertebrates.
机译：非本地物种入侵了全世界的沿海系统，改变了社区结构和生态系统功能。海带Undaria pinnatifida是分布最广的海洋入侵者之一。在澳大拉西亚，Undaria是一种大型的一年生海带，通常具有单峰生长模式，其特征是在冬末和春季都有较高的覆盖率。 Undaria可能与贻贝同时出现，并影响礁石上贻贝组合的生物多样性，特别是考虑到贻贝养殖场中存在的贻贝。在这里，我们测试了Undaria和贻贝是否同时在不同的时空尺度上出现在礁石上，Undaria是否影响与贻贝相关的小型无脊椎动物的多样性。对调查数据的分析表明，Undaria的个体通常附着在低潮间带的贻贝聚集体周围，或散布在其中，在典型的冬季生长和夏季衰老季节，Undaria的丰度相似。我们假设这种意外的模式是由世代交叠加上更长的生长季节引起的，这可能是由局部较高的波浪作用触发的，而不是单个植物持续了整整一年。对Undaria坚牢度和非生命的拟态Undaria坚牢度的分析表明，活的和大型的坚牢度尤其改变和增加了Undaria与贻贝共生的移动无脊椎动物的小规模多样性。我们得出的结论是，Undaria与贻贝同时出现的时间较长，Undaria改变了与贻贝相关的小型无脊椎动物移动群落。

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  • 来源
    《Marine biology》 |2018年第10期|173.1-173.14|共14页
  • 作者

    Thomsen Mads S.; Alestra Tommaso; Brockerhoff David; Lilley Stacie A.; South Paul M.; Schiel David R.;

  • 作者单位

    Univ Western Australia, Sch Plant Biol, Hackett Dr, Crawley, WA 6009, Australia;

    Cawthron Inst, 98 Halifax St East, Nelson 7010, New Zealand;

    Univ Canterbury, Marine Ecol Res Grp, Sch Biol Sci, Private Bag 4800, Christchurch, New Zealand;

    Univ Western Australia, UWA Oceans Inst, Hackett Dr, Crawley, WA 6009, Australia;

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