Spatial and temporal distribution of floating kelp in the channels and fjords of southern Chile
Spatial and temporal distribution of floating kelp in the channels and fjords of southern Chile
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DOI：
10.1016/j.ecss.2009.12.010
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发表时间：
2010-04-30
影响因子：
2.8
通讯作者：
Thiel, Martin
中科院分区：
文献类型：
--
作者：
Hinojosa, Ivan A.;Pizarro, Matias;Thiel, Martin
大量研究表明，漂浮的大型藻类有助于藻类本身以及相关生物体的种群连通性。为了评估漂浮大型藻类对智利南部人口连通性的重要性，我们分析了它们的空间和时间分布。我们通过 2002-2005 年南方春季（11 月）和冬季（7 月）期间进行的船舶调查估算了奇洛埃内海和洛斯乔诺斯群岛中漂浮海藻的丰度。春季期间发现了最高密度的漂浮海带（Macrocystis Pyrifera 和 Durvillaea antarctica）。一般来说，在淡水供应充足的地区，漂浮海带的密度相对较低，而在通向公海的大型航道中，其丰度最高。我们认为，这种模式是由于天然海带床的稀缺、内峡湾漂浮海带的快速退化以及向海表面的流出造成的。漂浮海带的最大密度发现于已知为广泛汇聚区（即河口前缘）的区域，该区域似乎充当滞留区。根据这种分布模式，我们认为，在受海洋影响的外部河道中，当地人口之间通过漂浮海带的连通性高于在淡水流入量较高的内部峡湾中。 (C) 2009 Elsevier Ltd. 保留所有权利。
Numerous studies suggest that floating macroalgae contribute to population connectivity of the algae themselves as well as of associated organisms. In order to evaluate the importance of floating macroalgae for population connectivity in southern Chile we analysed their spatial and temporal distributions. We estimated the abundance of floating kelp in the Interior Sea of Chiloe and the Los Chonos Archipelago via ship surveys conducted during austral spring (November) and winter (July) of the years 2002-2005. Highest densities of floating kelp (Macrocystis pyrifera and Durvillaea antarctica) were found during spring. Generally, the density of floating kelp was relatively low in areas with high supply of freshwater, and highest abundances were found in large channels opening to the open ocean. We suggest that this pattern is caused by the scarcity of natural kelp beds combined with rapid degradation of floating kelp in the interior fjords and by seaward surface outflow. The maximum densities of floating kelps were found in an area known to be an extensive convergence zone (i.e. estuarine front), which appears to act as a retention zone. In accordance with this distribution pattern, we propose that connectivity between local populations via floating kelp is higher in the outer channels with oceanic influence than in the inner fjords with high freshwater influx. (C) 2009 Elsevier Ltd. All rights reserved.