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dc.contributor.author Thompson, S. A. en
dc.contributor.author Knoll, H. en
dc.contributor.author Blanchette, C. A. en
dc.contributor.author Nielsen, Karina J. en
dc.date.accessioned 2012-09-26T20:13:59Z en
dc.date.available 2010-12-01T20:39:50Z en
dc.date.issued 2010 en
dc.identifier.citation Population consequences of biomass loss due to commercial collection of the wild seaweed Postelsia palmaeformis. Marine Ecology Progress Series 413: 17-31. en
dc.identifier.issn 1616-1599 en
dc.identifier.uri http://hdl.handle.net/10211.1/696 en
dc.description Marine Ecology Progress Series - Published by Inter-Research Science Center. The definitive version of this publication is available at http://www.int-res.com/articles/meps_oa/m413p017.pdf en
dc.description.abstract Commercial take of Postelsia palmaeformis (hereafter Postelsia), an annual kelp found only on wave-exposed, rocky shores of the Northeast Pacific, is increasing rapidly in California where regulation of the edible seaweed ‘fishery’ is minimal. Many commercial collectors use a frond trimming method they claim is sustainable and allows for multiple collections per year. Unlike cutting at the stipe, which is lethal and can drive populations to extinction, frond trimming preserves the meristem, allowing fronds to regrow. To evaluate the ecological consequences of biomass loss and sustainability of this commercial take method we conducted 2 field experiments. We trimmed fronds at different frequencies and times and then measured: (1) frond regrowth and reproductive output and (2) population recruitment. We explored the potential for geographic variation by replicating the first experiment near the center and southern limit of Postelsia’s biogeographic range. Fronds trimmed in April–June were able to regrow and eventually produce viable spores, albeit at somewhat reduced rates. However, spore production was sharply reduced when fronds were trimmed after the onset of sporogenesis (end of July), whether trimmed once or twice. These effects were similar across the geographic range examined but varied in magnitude. Recruitment was 38% greater in populations not subjected to trimming and population sizes were reduced by 40 to 50% when trimmed. A precautionary approach to management should: (1) mandate the frond trimming method, (2) en
dc.description.uri http://www.int-res.com/articles/meps_oa/m413p017.pdf en
dc.language.iso en_US en
dc.publisher Marine Ecology Progress Series en
dc.subject Postelsia palmaeformis en
dc.subject conservation en
dc.subject kelp en
dc.subject commercial collection en
dc.subject sea palm en
dc.title Population Consequences of Biomass Loss Due to Commercial Collection of the Wild Seaweed Postelsia Palmaeformis. en
dc.type Article en
dc.relation.journal Marine Ecology Progress Series en
dc.contributor.sonomaauthor Nielsen, Karina J. en


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