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Spatial and temporal distribution of floating kelp in the channels and fjords of southern Chile


Hinojosa Toledo, IA and Pizarro, M and Ramos, M and Thiel, M, Spatial and temporal distribution of floating kelp in the channels and fjords of southern Chile, Estuarine, Coastal and Shelf Science, 87, (3) pp. 367-377. ISSN 0272-7714 (2010) [Refereed Article]

Copyright Statement

Copyright 2009 Elsevier

DOI: doi:10.1016/j.ecss.2009.12.010


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.

Item Details

Item Type:Refereed Article
Keywords:rafting, floating algea, Macrocystis, Durvillaea, retention zone, connectivity
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Conservation and biodiversity
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Hinojosa Toledo, IA (Mr Ivan Hinojosa)
ID Code:88863
Year Published:2010
Web of Science® Times Cited:47
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2014-02-19
Last Modified:2014-05-22

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