Age, growth and maturation of jumbo squid Dosidicus gigas (Cephalopoda: Ommastrephidae) from the Gulf of California, Mexico

Markaida, Unai; Velázquez, Casimiro Quiñónez; Sosa‐Nishizaki, Oscar

doi:10.1016/s0165-7836(03)00184-x

Cited by 84 publications

(86 citation statements)

References 13 publications

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“…These large fishes are being replaced by smaller individuals, by smaller fish species, and by squid, a consequence also seen in other fisheries (8). Dosidicus, because it grows rapidly to large size and with no apparent seasonality to its reproduction (13,38), can respond quickly to niches made accessible by the decline of large predatory fishes, which have longer life spans and delayed maturity (2,8,10). The removal of top predators like tuna and billfish may promote Dosidicus population growth and range expansion by reducing competition for their shared prey species.…”

Section: Discussionmentioning

confidence: 99%

Invasive range expansion by the Humboldt squid, Dosidicus gigas , in the eastern North Pacific

Zeidberg

Robison

2007

Proc. Natl. Acad. Sci. U.S.A.

255

184

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A unique 16-year time series of deep video surveys in Monterey Bay reveals that the Humboldt squid, Dosidicus gigas, has substantially expanded its perennial geographic range in the eastern North Pacific by invading the waters off central California. This sustained range expansion coincides with changes in climate-linked oceanographic conditions and a reduction in competing top predators. It is also coincident with a decline in the abundance of Pacific hake, the most important commercial groundfish species off western North America. Recognizing the interactive effects of multiple changes in the environment is an issue of growing concern in ocean conservation and sustainability research.invasive species ͉ top predators ͉ top-down forcing O ne of the greatest challenges in contemporary ocean science is that of predicting how oceanic communities will respond to impending changes, such as climatic warming and the removal of top predators (1). Interactive changes are of particular concern, but little information is available on the collateral effects of multiple factors. Rising temperatures have been implicated in shifting the geographical distribution patterns of fishes and plankton (2, 3) and in the disruption of plankton communities (4, 5). Removing top predators from an ecosystem can result in a cascade of effects that restructures the food web at lower trophic levels (6, 7) as well as at the top (8). Together, two or more such changes may act in ways that we cannot yet predict (9).Here we demonstrate that the Humboldt squid, Dosidicus gigas, has greatly extended its perennial range in the eastern North Pacific Ocean. This geographic expansion occurred during a period of ocean-scale warming, regional cooling, and the decline of tuna and billfish populations throughout the Pacific (10). In this case, environmental changes off California are concurrent with invasion by a species from an adjacent region. Examples of invasion by species at higher trophic levels are relatively rare. The subsequent ecological impact of the Humboldt squid invasion can be seen in possible top-down forcing on the local population of Pacific hake, but the ecological effects may not yet be fully expressed (11). The question of how an oceanic community will respond to climatic change must include the possibility of invading species (12), and the consequences of removing top predators may depend on whether there is an ecological understudy waiting in the wings. Dosidicus (Fig. 1) is a large, aggressive, abundant pelagic squid that reaches mantle lengths of 1.2 m, overall lengths Ͼ2 m, and weights up to 50 kg. Its geographical distribution is centered in the eastern equatorial Pacific. From these warm waters, its historical range extends along the subtropical coasts of both North and South America, with episodic but temporary range extensions to latitudes as high as 40°(13). Only a single species is known, although genetic evidence suggests that northern and southern populations are diverging (13,14). Dosidicus feeds opportunistically on a bro...

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Section: Discussionmentioning

confidence: 99%

Invasive range expansion by the Humboldt squid, Dosidicus gigas , in the eastern North Pacific

Zeidberg

Robison

2007

Proc. Natl. Acad. Sci. U.S.A.

255

184

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“…Since growth rates in jumbo squid vary by size, season and location (see Argüelles et al 2001, Markaida et al 2004, each 3 cm section is likely to represent different time periods within a squid and also among individuals and areas. Therefore, each isotopic signature by proostracum section was related with a measurement that is common for all squid: length along gladius (Figs.…”

Section: Trophic Variationmentioning

confidence: 99%

Ontogenetic variation of δ13C and δ15N recorded in the gladius of the jumbo squid Dosidicus gigas: geographic differences

Ruiz-Cooley¹,

Villa²,

Gould³

2010

Mar. Ecol. Prog. Ser.

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“…The Humboldt squid, Dosidicus gigas, is a large muscular squid with a rapid growth rate, a short life span and extremely high fecundity (Nigmatullin et al, 2001;Markaida et al, 2004;Argüelles et al, 2001). It is associated with highly productive, upwelling-driven ecosystems in the California and Peru Current Systems of the eastern Pacific Ocean (Roper et al, 1984).…”

Section: Introductionmentioning

confidence: 99%

Locomotion and behavior of Humboldt squid,Dosidicus gigas, in relation to natural hypoxia in the Gulf of California, Mexico

Gilly

Zeidberg

Booth

et al. 2012

Journal of Experimental Biology

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SUMMARYWe studied the locomotion and behavior of Dosidicus gigas using pop-up archival transmitting (PAT) tags to record environmental parameters (depth, temperature and light) and an animal-borne video package (AVP) to log these parameters plus acceleration along three axes and record forward-directed video under natural lighting. A basic cycle of locomotor behavior in D. gigas involves an active climb of a few meters followed by a passive (with respect to jetting) downward glide carried out in a finsfirst direction. Temporal summation of such climb-and-glide events underlies a rich assortment of vertical movements that can reach vertical velocities of 3ms , characteristic of the midwater oxygen minimum zone (OMZ), can influence the daytime depth of squid, but this depends on location and season, and squid can ʻdecoupleʼ from this environmental feature. Light is also an important factor in determining daytime depth, and temperature can limit nighttime depth. Vertical velocities were compared over specific depth ranges characterized by large differences in dissolved oxygen. Velocities were generally reduced under OMZ conditions, with faster jetting being most strongly affected. These data are discussed in terms of increased efficiency of climband-glide swimming and the potential for foraging at hypoxic depths.

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Age, growth and maturation of jumbo squid Dosidicus gigas (Cephalopoda: Ommastrephidae) from the Gulf of California, Mexico

Cited by 84 publications

References 13 publications

Invasive range expansion by the Humboldt squid, Dosidicus gigas , in the eastern North Pacific

Invasive range expansion by the Humboldt squid, Dosidicus gigas , in the eastern North Pacific

Ontogenetic variation of δ13C and δ15N recorded in the gladius of the jumbo squid Dosidicus gigas: geographic differences

Locomotion and behavior of Humboldt squid,Dosidicus gigas, in relation to natural hypoxia in the Gulf of California, Mexico

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