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Population features of the invasive kelp Undaria pinnatifida (Phaeophyceae: Laminariales) in Nuevo Gulf (Patagonia, Argentina)

Published online by Cambridge University Press:  15 February 2008

Graciela N. Casas ,
María Luz Piriz  and
Elisa R. Parodi
Graciela N. Casas*
Affiliation:
Centro Nacional Patagónico (CENPAT–CONICET), Boulevard Brown s/n-(9120), Puerto Madryn, Argentina
María Luz Piriz
Affiliation:
Centro Nacional Patagónico (CENPAT–CONICET), Boulevard Brown s/n-(9120), Puerto Madryn, Argentina
Elisa R. Parodi
Affiliation:
Universidad Nacional del Sur, Departamento de Biología, Bioquímica y Farmacia, San Juan 670-(8000) Bahía Blanca, Argentina Instituto Argentino de Oceanografía (IADO–CONICET), Camino de la Carrindanga s/n-(8000) Bahía Blanca, Argentina
*
Correspondence should be addressed to: Graciela N. Casas Centro Nacional Patagónico (CENPAT–CONICET), Boulevard Brown s/n-(9120) Puerto MadrynArgentina email: graciela@cenpat.edu.ar
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Abstract

The invasive kelp Undaria pinnatifida was observed for the first time in the Nuevo Gulf (Patagonia, Argentina) in December 1992. At the present time, with the exception of sandy bottoms, the coasts of the Nuevo Gulf are almost entirely colonized. From October 1997 to February 2000, the characteristics of this population, i.e. the relationships between morphological features and seawater temperature, the seasonality in sporophyll development and the proportions of different reproductive stages during its life cycle, were analysed. The observations confirmed that the maximal mean densities of sporophytes (149.1 plants m−2) occurred in winter while the mean tallest sporophytes (88.5 cm) and the mean highest biomass (16501 g m−2) were registered in spring and at the beginning of the summer. Coexisting juvenile and mature sporophytes were found. Sporophylls showed also seasonal characteristics, with maximal width in summer. Manipulative experiments conducted for testing the recruitment pattern of Undaria pinnatifida confirmed that the presence of juvenile individuals was uninterrupted. Thus, in this paper, we denote that U. pinnatifida has a constant recruitment, together with high reproductive rates, which are some of the characteristics of an introduced species, which explains why they became a highly invasive species or ‘pest species’, with negative environmental and economic effects.

Keywords

introduced speciesrecruitment patternsreproductive phenologyUndaria pinnatifida
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 1 , February 2008 , pp. 21 - 28
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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