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Artículo

Fluctuations in range and abundance of snow crab (Chionoecetes opilio) from the eastern Bering Sea: What role for Pacific cod (Gadus macrocephalus) predation?

Burgos, Julian; Ernst, Billy; Armstrong, David; Orensanz, Jose MariaIcon
Fecha de publicación: 01/2013
Editorial: University of Miami. Rosenstiel School of Marine and Atmospheric Science
Revista: Bulletin of Marine Science
ISSN: 0007-4977
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
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Resumen

Fluctuations in abundance of commercially valuable crustacean stocks in sub-Arctic ecosystems have been variously attributed to the effects of climatic forcing, fishing pressure, and predation, mostly by gadoid fishes. Landings of snow crab, Chionoecetes opilio (J. C. Fabricius, 1788), from the eastern Bering Sea declined after the early 1990s, reaching historical lows a decade later. At the same time, two phenomena became apparent in the dynamics of the primiparae (first-time female breeders): their geographic range contracted to the northwest along the middle shelf (50–100 m depth), and the contraction was punctuated by periodic recruitment to the mature female pool, with a period of approximately 7 yrs and declining amplitude. The first phenomenon has been addressed by the environmental ratchet hypothesis, which attributes the contraction to a combination of an ontogenetic female migration, circulation patterns, the spatial dynamics of benthic stages in relation to near-bottom temperature, and predation by Pacific cod, Gadus macrocephalus Tilesius, 1810. Mortality due to cod predation in the Middle Domain, apparently related to near-bottom temperature, increased after 1995, contributing to the ratchet effect and the disappearance of periodic pulses of primipara abundance. Cod predation does not, however, appear to have controlled the frequency of periodic recruitment fluctuations. On the other hand, amplitude of fluctuations of primipara abundance in the Middle Domain, purportedly the "engine" of renewal of this stock, do appear to be affected by both predation and climate, whose interaction is complex but perhaps interpretable.
Palabras clave: Snow Crab , Cod , Predation , Population Dynamics
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/5644
URL: http://www.ingentaconnect.com/content/umrsmas/bullmar/2013/00000089/00000001/art
DOI: http://dx.doi.org/10.5343/bms.2011.1137
DOI: http://dx.doi.org/ 10.5343/bms.2011.1137
Colecciones
Articulos(CCT-CENPAT)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Citación
Burgos, Julian; Ernst, Billy; Armstrong, David; Orensanz, Jose Maria; Fluctuations in range and abundance of snow crab (Chionoecetes opilio) from the eastern Bering Sea: What role for Pacific cod (Gadus macrocephalus) predation?; University of Miami. Rosenstiel School of Marine and Atmospheric Science; Bulletin of Marine Science; 89; 1; 1-2013; 57-81
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