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Ecological impacts of two non-indigenous macroalgae on an urban rocky intertidal shore

机译：两种非本地大型藻类对城市岩石潮间带海岸的生态影响

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摘要

Non-indigenous marine species often change the abundance and diversity of native species in coastal ecosystems. On the SW Atlantic coast, the macroalgae Ahnfeltiopsis sp. (Rhodophyta, Phyllophoraceae) and Schizymenia dubyi (Rhodophyta, Schizymeniaceae) have invaded the intertidal rocky shore of Mar del Plata, Argentina (38 degrees S, 57 degrees W). To study the spread and ecological associations of these invasive species, algal abundance, biomass and biodiversity of benthic assemblages at three different tidal levels were examined during five years. Sparse Ahnfeltiopsis sp. thalli (3 % cover) were detected in February 2007 at the three tidal levels. By January 2011, its cover had increased to 11 %, while its biomass showed a 27-fold increase. S. dubyi was detected at the lower intertidal level in January 2010 with a cover of 2 %. By January 2011, it had increased to 5 % and spread to the other intertidal levels. The presence of these two non-indigenous algae modified the substrate and the structure and composition of the benthic assemblage. The constant increase in the algal biomass and presence along the intertidal suggest that the effect will be greater in the future. Moreover, the effects of these exotic algae could potentially displace Brachidontes rodriguezii-an important ecosystem engineer that creates microhabitat for a large number of organisms on these shores.
机译：非本地海洋物种通常会改变沿海生态系统中本地物种的丰度和多样性。在西南大西洋海岸，大型藻类Ahnfeltiopsis sp。 （Rhodophyta，Phyllophoraceae）和Schizymenia dubyi（Rhodophyta，Schizymeniaceae）入侵了阿根廷马德普拉塔的潮间带岩石海岸（南纬38度，西纬57度）。为了研究这些入侵物种的传播和生态联系，在五年内检查了三种不同潮汐水平下底栖动物的藻类丰度，生物量和生物多样性。稀疏的羊膜藻2007年2月，在三个潮汐水位处发现了thalli（覆盖率为3％）。到2011年1月，其覆盖率已提高到11％，而其生物量却增长了27倍。在2010年1月，潮间带较低水平检测到杜拜链球菌，其覆盖率为2％。到2011年1月，它已增加到5％，并蔓延到其他潮间带水平。这两种非本土藻类的存在改变了底物以及底栖组合的结构和组成。藻类生物量的不断增加和潮间带的存在表明未来的影响将更大。此外，这些外来藻类的影响可能会取代Brachidontes rodriguezii，这是一个重要的生态系统工程师，为这些海岸上的大量生物创造了微生境。

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  • 来源
    《Marine biology》 |2016年第8期|178.1-178.12|共12页
  • 作者

    Gabriela Palomo Maria; Bagur Maria; Quiroga Marina; Soria Sabrina; Bugnot Ana;

  • 作者单位

    Grp Invest & Educ Temas Ambientales GrIETA, Mar Del Plata, Buenos Aires, Argentina|Museo Argentino Ciencias Nat Bernardino Rivadavia, Lab Ecosistemas Costeros, Ave Angel Gallardo 470,C1405DJR, Buenos Aires, DF, Argentina;

    Museo Argentino Ciencias Nat Bernardino Rivadavia, Lab Ecosistemas Costeros, Ave Angel Gallardo 470,C1405DJR, Buenos Aires, DF, Argentina;

    Museo Argentino Ciencias Nat Bernardino Rivadavia, Lab Ecosistemas Costeros, Ave Angel Gallardo 470,C1405DJR, Buenos Aires, DF, Argentina;

    Museo Argentino Ciencias Nat Bernardino Rivadavia, Lab Ecosistemas Costeros, Ave Angel Gallardo 470,C1405DJR, Buenos Aires, DF, Argentina;

    Univ Sydney, Sch Biol Sci, Ctr Res Ecol Impacts Coastal Cities, Marine Ecol Labs A11, Sydney, NSW 2006, Australia;

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