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No. de sistema: 000060355

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008 _ _ 200507m20209999xx^^r^p^o^^^^z0^^^a0eng^d
040 _ _ a| ECO
c| ECO
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245 0 0 a| Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico
506 _ _ a| Acceso en línea sin restricciones
520 1 _ a| Over the past two decades, the Gulf of California (GOC) has experienced three strong El Niño events (1997–1998, 2009–2010, and 2015–2016), each of which was followed by a drastic reduction in mantle length of mature Humboldt squid, Dosidicus gigas (from >60 cm to <20 cm). However, it is unclear how the oceano-graphic changes associated with strong El Niño events affected the midwater organisms on which D. gigas feed, limiting our ability to assess the relative importance of temperature and food availability in the phenotypic response of D. gigasto environmental variability. We quantified the diet of D. gigas in the GOC before, during, and following the past three El Niño events and found that although its diet varied little across a large range of body sizes (8–85 cm), significant and predictable diet variability was observed with respect to sea surface temperature and chlorophyll-a concentration. Consumption of large numbers of relatively small, high calorie prey inboth relatively cool (anchovies) and relatively warm, productive conditions (myctophids) is likely necessary to support growth to large body sizes before maturation. When warm, unproductive conditions prevailed in the GOC, only small squid were present and had diets dominated by euphausiids and pteropods, prey with relatively low caloric value. Using a time series of diet data, this work provides unique insights into the response of a midwater forage community to oceanographic variability and the effects of environmental variability on thetrophic ecology of an oceanic predator.
530 _ _ a| Disponible en línea
533 _ _ a| Reproducción electrónica en formato PDF
538 _ _ a| Adobe Acrobat profesional 6.0 o superior
650 _ 4 a| Dosidicus gigas
650 _ 4 a| Talla corporal
650 _ 4 a| Dieta
650 _ 4 a| Factores ambientales
650 _ 4 a| El Niño oscilación del Sur
650 _ 4 a| Cambio climático
651 _ 4 a| Baja California (México)
700 1 _ a| Portner, Elan J.
e| autor
700 1 _ a| Markaida Aburto, Unai
e| autor
n| 55898480600
700 1 _ a| Robinson, Carlos J.
e| autor
700 1 _ a| Gilly, William F.
e| autor
773 0 _
t| Limnology and Oceanography
g| Volumen 65 (2020), p. 732-748
x| 1939-5590
856 4 1 u| https://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lno.11343
z| Artículo electrónico
902 _ _ a| BG / MM
904 _ _ a| Mayo 2020
905 _ _ a| Artecosur
905 _ _ a| Biblioelectrónica
LNG eng
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Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico
Portner, Elan J. (autor)
Markaida Aburto, Unai (autor)
Robinson, Carlos J. (autor)
Gilly, William F. (autor)
Nota: Disponible en línea
Acceso en línea sin restricciones
Contenido en: Limnology and Oceanography. Volumen 65 (2020), p. 732-748. ISSN: 1939-5590
No. de sistema: 60355
Tipo: Artículo
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Inglés

"Over the past two decades, the Gulf of California (GOC) has experienced three strong El Niño events (1997–1998, 2009–2010, and 2015–2016), each of which was followed by a drastic reduction in mantle length of mature Humboldt squid, Dosidicus gigas (from >60 cm to <20 cm). However, it is unclear how the oceano-graphic changes associated with strong El Niño events affected the midwater organisms on which D. gigas feed, limiting our ability to assess the relative importance of temperature and food availability in the phenotypic response of D. gigasto environmental variability. We quantified the diet of D. gigas in the GOC before, during, and following the past three El Niño events and found that although its diet varied little across a large range of body sizes (8–85 cm), significant and predictable diet variability was observed with respect to sea surface temperature and chlorophyll-a concentration. Consumption of large numbers of relatively small, high calorie prey inboth relatively cool (anchovies) and relatively warm, productive conditions (myctophids) is likely necessary to support growth to large body sizes before maturation. When warm, unproductive conditions prevailed in the GOC, only small squid were present and had diets dominated by euphausiids and pteropods, prey with relatively low caloric value. Using a time series of diet data, this work provides unique insights into the response of a midwater forage community to oceanographic variability and the effects of environmental variability on thetrophic ecology of an oceanic predator."


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