Repopulation techniques for Macrocystis integrifolia (Phaeophyceae: Laminariales) in Atacama, Chile

Renato Westermeier, Pedro Murúa, David J. Patiño, Liliana Muñoz, Carlos Atero, Dieter G. Müller

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Abstract

The giant kelp Macrocystis (integrifolia) has been intensely harvested in northern Chile for several years. In order to prevent a future disaster, we developed two different techniques for restoration of damaged Macrocystis integrifolia beds in the Atacama region of Chile. (1) Explantation: Laboratory-grown juvenile sporophytes were fixed to different substrata (plastic grids, ceramic plates, or boulders) by elastic bands or fast-drying glue (cyanoacrylate). Explants reached 150–200 cm in length within 5 months (relative growth rate ≈ 1.3–1.7 % day−1), and reproductive maturity in 5–7 months. (2) Seeding of spores: Mature sporophylls were placed at 8 m depth on the sea bottom, supported by cotton gauze sleeves attached to boulders of different origin. Sixty percent of clean boulders collected on the beach produced up to seven recruits per boulder. In contrast, 20 % of the boulders from the sea bottom, colonized by epibionts, showed up to two recruits. Relative growth rates, however, were similar (≈2.4–2.6 % day−1). Practical applications of our findings are: laboratory-produced juvenile sporophytes fixed to various substrata by elastic bands or cyanoacrylate glue can be used to colonize rocks or artificial reefs. In cases, where laboratory-grown seedlings are unavailable, mature sporophylls from nearby Macrocystis beds can be used to establish new recruits on rocky substrata.
Original languageEnglish
Pages (from-to)511-518
Number of pages7
JournalJournal of Applied Phycology
Volume26
Issue number1
Early online date26 Jun 2013
DOIs
Publication statusPublished - 1 Feb 2014

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Westermeier, R., Murúa, P., Patiño, D. J., Muñoz, L., Atero, C., & Müller, D. G. (2014). Repopulation techniques for Macrocystis integrifolia (Phaeophyceae: Laminariales) in Atacama, Chile. Journal of Applied Phycology, 26(1), 511-518. https://doi.org/10.1007/s10811-013-0069-5