Population biology and chemical composition of the red alga Callophyllis variegata (Rhodophyta; Cryptonemiales) in south
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23RD INTERNATIONAL SEAWEED SYMPOSIUM, JEJU
Population biology and chemical composition of the red alga Callophyllis variegata (Rhodophyta; Cryptonemiales) in southern Chile Renato Westermeier 1 Dieter G. Müller 6
&
Pedro Murúa 2 & Marcela Robles 1,3 & Marisol Barría 1,4 & David J. Patiño 1 & Liliana Muñoz 5 &
Received: 19 June 2019 / Revised and accepted: 31 October 2019 # Springer Nature B.V. 2019
Abstract The cosmopolitan red alga Callophyllis variegata is harvested and exported as food to Asian countries. In anticipation of overexploitation problems, this study aimed to describe temporal changes in their population structures and chemical composition by comparing intact (Pichicuyén) and exploited populations (San Antonio) of southern Chile, by using linear mixed models. Abundance parameters and size classes were higher in summer months, whereas fertile stages tetrasporophytes and carposporophytes were more abundant in autumn–winter periods. Recruitment was plentiful toward late winter–spring months. Geographical differences were also detected, and San Antonio (C. variegata-exploited) stocks exhibited lower productivity but similar cover/density in comparison to Pichicuyen (intact location). Likewise, this population showed a size structure toward smaller individuals (e.g., recruits) and more sterile individuals than Pichicuyen. Phosphorous, protein, lipid, soluble carbohydrate, and fiber composition also showed a clear seasonal trend, but no differences between localities were found for lipids and soluble carbohydrates. Since C. variegata showed good productivity and interesting nutritional value, we concluded this species shows potential for exploitation and commercialization in southern Chile, as long as specific management protocols and market studies are developed. Keywords Callophyllis variegata . Rhodophyta . Population dynamic . Abundance . Chemical composition . Red alga fishery . Seasonality . Southern Chile
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10811-019-01988-2) contains supplementary material, which is available to authorized users. * Renato Westermeier [email protected] 1
Instituto de Acuicultura, Universidad Austral de Chile, Sede Puerto Montt, PO Box 1327, Puerto Montt, Chile
2
The Scottish Association for Marine Science, Scottish Marine Institute, Oban PA37 1QA, UK
3
Present address: Laboratorio Zonal de Marea Roja, Seremi de Salud Región de Los Lagos, Quellon, Chile
4
Present address: Bachillerato en Ciencias y Recursos Naturales, Universidad Austral de Chile, Campus Patagonia, Coyhaique, Chile
5
Aberdeen Oomycete Laboratory, International Centre for Aquaculture Research and Development, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK
6
Fachbereich Biologie der Universität Konstanz, 78457 Konstanz, Germany
Introduction Callophyllis variegata is a cosmopolitan kallimeniacean seaweed, distributed in Chile from Antofagasta (23° 38′ S) to Cape Horn (55° 43′ S) (Ramirez & Santelices, 1991), but also in Alaska, Peru,
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