scholarly journals Trophic ecology of Humboldt squid, Dosidicus gigas , in conjunction with body size and climatic variability in the Gulf of California, Mexico

2019 ◽  
Vol 65 (4) ◽  
pp. 732-748 ◽  
Author(s):  
Elan J. Portner ◽  
Unai Markaida ◽  
Carlos J. Robinson ◽  
William F. Gilly
Keyword(s):  
Body Size ◽  
Gulf Of California ◽  
Trophic Ecology ◽  
Climatic Variability ◽  
Dosidicus Gigas ◽  
Humboldt Squid

Food in early life stages of Dosidicus gigas (Cephalopoda: Ommastrephidae) from the Gulf of California, Mexico

2013 ◽  
Vol 93 (7) ◽  
pp. 1903-1910 ◽  
Author(s):  
Susana Camarillo-Coop ◽  
César A. Salinas-Zavala ◽  
Bertha E. Lavaniegos ◽  
Unai Markaida
Keyword(s):  
Body Size ◽  
Early Life ◽  
Gulf Of California ◽  
Digestive System ◽  
Life Stages ◽  
Stomach Fullness ◽  
Early Life Stages ◽  
Dosidicus Gigas ◽  
Hunting Behaviour ◽  
Food Content

The digestive system of 36 paralarvae and 150 juvenile Dosidicus gigas were analysed to determine the diet. The early life stages were collected in the central and south region of the Gulf of California during different years and ranged in dorsal mantle length (ML) from 2.8 to 120.5 mm. The food content was separated first into identifiable material (IM) and non-identifiable material (NIM). All paralarvae contained only NIM stored mainly in the caecum rather than stomach. Juvenile squid feed on nine different prey types: euphausiids, copepods, amphipods, unidentified crustaceans, fishes, cephalopods, pteropods, bivalves and polychaetes. The IM were found mainly in the stomachs of juveniles with increasing number and diversity of prey in a function of increasing squid body size. In fact, juveniles from 60 to 120 mm ML had high stomach fullness percentages in half full and completely full stomachs suggesting improvement of swimming and hunting behaviour as they grow.

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

2012 ◽  
Vol 215 (18) ◽  
pp. 3175-3190 ◽  
Author(s):  
W. F. Gilly ◽  
L. D. Zeidberg ◽  
J. A. T. Booth ◽  
J. S. Stewart ◽  
G. Marshall ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Dosidicus Gigas ◽  
Humboldt Squid ◽  
And Behavior

Natural egg mass deposition by the Humboldt squid (Dosidicus gigas) in the Gulf of California and characteristics of hatchlings and paralarvae

2008 ◽  
Vol 88 (4) ◽  
pp. 759-770 ◽  
Author(s):  
Danna J. Staaf ◽  
Susana Camarillo-Coop ◽  
Steven H.D. Haddock ◽  
Al C. Nyack ◽  
John Payne ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Egg Mass ◽  
Dosidicus Gigas ◽  
Microbial Infection ◽  
Potential Fecundity ◽  
Egg Masses ◽  
In Captivity ◽  
In The Wild ◽  
Proboscis Extension ◽  
Humboldt Squid

The jumbo or Humboldt squid, Dosidicus gigas, is an important fisheries resource and a significant participant in regional ecologies as both predator and prey. It is the largest species in the oceanic squid family Ommastrephidae and has the largest known potential fecundity of any cephalopod, yet little is understood about its reproductive biology. We report the first discovery of a naturally deposited egg mass of Dosidicus gigas, as well as the first spawning of eggs in captivity. The egg mass was found in warm water (25–27°C) at a depth of 16 m and was far larger than the egg masses of any squid species previously reported. Eggs were embedded in a watery, gelatinous matrix and were individually surrounded by a unique envelope external to the chorion. This envelope was present in both wild and captive-spawned egg masses, but it was not present in artificially fertilized eggs. The wild egg mass appeared to be resistant to microbial infection, unlike the incomplete and damaged egg masses spawned in captivity, suggesting that the intact egg mass protects the eggs within. Chorion expansion was also more extensive in the wild egg mass. Hatchling behaviours included proboscis extension, chromatophore activity, and a range of swimming speeds that may allow them to exercise some control over their distribution in the wild.

scholarly journals Natural egg mass deposition by the Humboldt squid (Dosidicus gigas) in the Gulf of California and characteristics of hatchlings and paralarvae – ERRATUM

2016 ◽  
Vol 97 (2) ◽  
pp. 257-257 ◽  
Author(s):  
Danna J. Staaf ◽  
Susana Camarillo-Coop ◽  
Steven H.D. Haddock ◽  
Al C. Nyack ◽  
John Payne ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Egg Mass ◽  
Dosidicus Gigas ◽  
Humboldt Squid

The sensitivity of Neotoma to climate change and biodiversity loss over the late Quaternary

2021 ◽  
pp. 1-15
Author(s):  
Catalina P. Tomé ◽  
S. Kathleen Lyons ◽  
Seth D. Newsome ◽  
Felisa A. Smith
Keyword(s):  
Body Size ◽  
Late Quaternary ◽  
Climatic Variability ◽  
Isotope Analysis ◽  
Biodiversity Loss ◽  
Bone Collagen ◽  
Cam Plants ◽  
The Holocene ◽  
Carbon And Nitrogen ◽  
Terminal Pleistocene

Abstract The late Quaternary in North America was marked by highly variable climate and considerable biodiversity loss including a megafaunal extinction event at the terminal Pleistocene. Here, we focus on changes in body size and diet in Neotoma (woodrats) in response to these ecological perturbations using the fossil record from the Edwards Plateau (Texas) across the past 20,000 years. Body mass was estimated using measurements of fossil teeth and diet was quantified using stable isotope analysis of carbon and nitrogen from fossil bone collagen. Prior to ca. 7000 cal yr BP, maximum mass was positively correlated to precipitation and negatively correlated to temperature. Independently, mass was negatively correlated to community composition, becoming more similar to modern over time. Neotoma diet in the Pleistocene was primarily sourced from C3 plants, but became progressively more reliant on C4 (and potentially CAM) plants through the Holocene. Decreasing population mass and higher C4/CAM consumption was associated with a transition from a mesic to xeric landscape. Our results suggest that Neotoma responded to climatic variability during the terminal Pleistocene through changes in body size, while changes in resource availability during the Holocene likely led to shifts in the relative abundance of different Neotoma species in the community.

scholarly journals Chromogenic behaviors of the Humboldt squid (Dosidicus gigas) studied in situ with an animal-borne video package

2015 ◽  
Vol 218 (2) ◽  
pp. 265-275 ◽  
Author(s):  
H. Rosen ◽  
W. Gilly ◽  
L. Bell ◽  
K. Abernathy ◽  
G. Marshall
Keyword(s):  
Dosidicus Gigas ◽  
Humboldt Squid
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