Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico
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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| Subjects: | Dosidicus gigas, Talla corporal, Dieta, Factores ambientales, El Niño oscilación del Sur, Cambio climático, |
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KOHA-OAI-ECOSUR:603552024-08-07T11:27:20ZTrophic 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 Doctor autor 7960 Robinson, Carlos J. autor Gilly, William F. Doctor autor 22596 textengOver 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.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.Adobe Acrobat profesional 6.0 o superiorDosidicus gigasTalla corporalDietaFactores ambientalesEl Niño oscilación del SurCambio climáticoDisponible en líneaLimnology and Oceanographyhttps://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lno.11343Acceso en línea sin restricciones |
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Dosidicus gigas Talla corporal Dieta Factores ambientales El Niño oscilación del Sur Cambio climático Dosidicus gigas Talla corporal Dieta Factores ambientales El Niño oscilación del Sur Cambio climático |
| spellingShingle |
Dosidicus gigas Talla corporal Dieta Factores ambientales El Niño oscilación del Sur Cambio climático Dosidicus gigas Talla corporal Dieta Factores ambientales El Niño oscilación del Sur Cambio climático Portner, Elan J. autor Markaida Aburto, Unai Doctor autor 7960 Robinson, Carlos J. autor Gilly, William F. Doctor autor 22596 Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico |
| description |
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. |
| format |
Texto |
| topic_facet |
Dosidicus gigas Talla corporal Dieta Factores ambientales El Niño oscilación del Sur Cambio climático |
| author |
Portner, Elan J. autor Markaida Aburto, Unai Doctor autor 7960 Robinson, Carlos J. autor Gilly, William F. Doctor autor 22596 |
| author_facet |
Portner, Elan J. autor Markaida Aburto, Unai Doctor autor 7960 Robinson, Carlos J. autor Gilly, William F. Doctor autor 22596 |
| author_sort |
Portner, Elan J. autor |
| title |
Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico |
| title_short |
Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico |
| title_full |
Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico |
| title_fullStr |
Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico |
| title_full_unstemmed |
Trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the Gulf of California, Mexico |
| title_sort |
trophic ecology of humboldt squid, dosidicus gigas, in conjunction with body size and climatic variability in the gulf of california, mexico |
| url |
https://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lno.11343 |
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