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Larval supply of Peruvian scallop to the marine reserve of Lobos de Tierra Island: A modeling approach

TitleLarval supply of Peruvian scallop to the marine reserve of Lobos de Tierra Island: A modeling approach
Publication TypeJournal Article
Year of Publication2019
AuthorsFlores-Valiente, J, Tam, J, Brochier, T, Colas, F, Pecquerie, L, Aguirre-Velarde, A, Mendo, J, Lett, C
JournalJournal of Sea Research
Volume144
Pagination142-155
Date PublishedFEB
Type of ArticleArticle
ISSN1385-1101
KeywordsBiophysical model, Humboldt current system, larval transport, Marine connectivity, Marine reserve, Peruvian scallop
Abstract

The Peruvian scallop (Argopecten purpuratus) is the second main contributor to the total catch of mollusks in Peru, after jumbo squid. There are two main scallop banks populations in northern Peru: Lobos de Tierra Island (LTI) and Sechura Bay (SB). Despite a continuous, intense relocation of seeds from LTI, the natural bank population still persists there. To understand this, we studied larval connectivity between LTI and SB using the first invertebrate larval transport biophysical model developed in the region. Larval local retention were 2.4% and 1.57% on average at LTI and SB respectively, while larval transport from SB to LTI was 0.02% on average and 0.07% in the opposite direction. Both larval retention and larval transport increased with spawning depth and were highest in austral summer. Two main larval transport paths from SB to LTI were identified, resulting from a combination of horizontal mesoscale circulation patterns and vertical flows. Potential management implications for these natural banks are discussed.

DOI10.1016/j.seares.2018.12.003