The invasion of Undaria pinnatifida to a Macrocystis pyrifera kelp in Patagonia (Argentina, south-west Atlantic)
The invasion of Undaria pinnatifida to a Macrocystis pyrifera kelp in Patagonia (Argentina, south-west Atlantic)
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裙带菜 (Undaria pinnatifida) 入侵巴塔哥尼亚 (阿根廷，西南大西洋) 的巨囊藻海带
DOI：
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发表时间：
2009
影响因子：
1.2
通讯作者：
O. Iribarne
中科院分区：
文献类型：
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作者：
M. P. Raffo;M. C. Eyras;O. Iribarne
生物入侵可以改变当地社区的生物多样性，产生生态影响，在许多情况下是不可逆转的。 2001年，裙带菜入侵克拉克湾（南纬42°56′，西经64°27′；阿根廷巴塔哥尼亚北部）的巨囊藻海带。 2004 年 3 月，通过对海带物种及其相关固着物生物多样性的种群和形态参数的研究，评估了这次入侵可能产生的影响。海带的空间分布存在3个邻近区域，一是以M.pyifera(M)为主的区域，一是以M.pyifera和U.pinnatifida(M+U)为主的中间区域，另一区域以U.pinnatifida(U)为主。在每个区域，收集 9 个 1 m2 样方的孢子体。在 U. pinnatifida 存在的情况下，M.pyifera 的密度和生物量 m−2、孢子体的高度和固着器的大小并没有减少。与两种海带固着物相关的植物区系的丰富度、丰度和多样性相似，而与 M.pyifera 相关的动物群的这些参数高于 U.pinnatifida。 这项工作中获得的结果表明，在这个入侵阶段，没有种间竞争的证据。然而，由于与固定地相关的动物群的密度和多样性不同，如果 U. pinnatifida 入侵继续扩大，我们预计群落会发生变化。
Biological invasions can alter the biodiversity of native communities generating an ecological impact that in many cases is irreversible. In 2001, Undaria pinnatifida invaded Macrocystis pyrifera kelp in Cracker Bay (42°56′S, 64°27′W; Northern Patagonia, Argentina). The possible impact of that invasion was evaluated in March 2004 with a study of population and morphological parameters of both kelp species and their associated holdfast biodiversity. Three nearby areas of spatial distribution of the kelps were differentiated, one dominated by M. pyrifera (M), an intermediate area characterized by M. pyrifera and U. pinnatifida (M+U), and another dominated by U. pinnatifida (U). In each area, sporophytes in nine quadrats of 1 m2 were collected. The density and biomass m−2, the height of the sporophytes and the size of the holdfast of M. pyrifera did not diminish in the presence of U. pinnatifida. The richness, abundance and diversity of the flora associated with the holdfast of both kelps were similar, whereas these parameters were higher in the case of the fauna associated to M. pyrifera than U. pinnatifida Results obtained in this work suggest that, at this invasion stage, there is no evidence of interspecific competition. Nevertheless, since density and diversity of the fauna associated with the holdfast is different, we expect community changes if the U. pinnatifida invasion continues to expand.