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Invita |
POSGRADO EN ECOLOGIA MARINA |
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Fecha |
2019-02-26, 13:00:00 hrs |
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Lugar: |
Auditorio Pedro Ripa del Edificio de Oceanología |
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Ponente(s): |
Dra. Natalya Gallo
(Investigadora posdoctoral, CalCOFI-SIO)
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Resumen: |
As oceans warm due to anthropogenic climate change, the global ocean oxygen inventory decreases in a process known as ocean deoxygenation. Since oxygen is fundamental for aerobic life, ocean deoxygenation can impact marine organisms across multiple levels of biological organization. This research used the steep gradients in oxygen characteristic of upwelling margins with oxygen minimum zones (OMZs), as a natural experiment to study how hypoxia affects the composition, diversity, trophic structure and dynamics of demersal fish communities. These questions are assessed using trawls, remotely operated vehicles, and autonomous landers, with a regional focus on the Gulf of California and the Southern California Bight. Results suggest that the expansion of low-oxygen conditions in the E. Pacific may lead to a shift in community composition as intolerant species are excluded and hypoxia-tolerant species become competitive, an overall decrease in diversit y , a reduction in bentho-pelagic coupling, and a lengthening of the food chain as demersal fish shift to utilizing benthic resource. |
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