Keyl, Friedemann, Argüelles, Juan, Mariátegui, Luís, Tafur, Ricardo, Wolff, Matthias ORCID: https://orcid.org/0000-0001-7458-983X and Yamashiro, Carmen (2008) A Hypothesis on Range Expansion and Spatio-Temporal Shifts in Size-at-Maturity of Jumbo Squid (Dosidicus gigas) in the Eastern Pacific Ocean. CaICOFI Reports, 49 . pp. 119-128.

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Abstract

Dosidicus gigas is a fast growing predator in the eastern Pacific Rim with high energy demand. Since 2000, it has been found in waters beyond its until-then-known northern and southern distribution limits. At the same time, specimens in the southern hemisphere were observed to reach maturity at significantly larger sizes. Spatio-temporal differences in temperature and food abundance may explain population changes in maturation, growth, and migration. Size-at-maturity depends on temperature and food availibilty, meaning jumbo squid will mature at smaller sizes under warm conditions and at larger sizes that can migrate longer distances in cool conditions. In this paper, we present the hypothesis that present invasion of jumbo squid into formerly uninhabited areas was the result of a combination of favorable environmental conditions and fishery impacts: the regime shift from warm to cool water following a strong La Niña/El Niño combined with the fisheries' impact on competitors and predators of D. gigas opened up a previously unavailable niche, or "loophole," and allowed for the present spatial expansion of jumbo squid.

Document Type:	Article
Programme Area:	PA Not Applicable
Research affiliation:	ZMT All Resource Management
Refereed:	Yes
Document Access:	Closed access
ISSN:	0575-3317
Date Deposited:	28 Feb 2020 14:00
Last Modified:	08 Oct 2026 11:27
URI:	https://cris.leibniz-zmt.de/id/eprint/3484

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