Projections of climate-driven changes in tuna vertical habitat based on species-specific differences in blood oxygen affinity.

Autor: Mislan KAS; School of Oceanography, University of Washington, Seattle, WA, USA.; eScience Institute, University of Washington, Seattle, WA, USA., Deutsch CA; School of Oceanography, University of Washington, Seattle, WA, USA., Brill RW; Department of Fisheries Science, Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, VA, USA.; Behavioral Ecology Branch, James J. Howard Marine Sciences Laboratory, NOAA Northeast Fisheries Science Center, Highlands, NJ, USA., Dunne JP; NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA., Sarmiento JL; Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ, USA.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2017 Oct; Vol. 23 (10), pp. 4019-4028. Date of Electronic Publication: 2017 Jul 21.
DOI: 10.1111/gcb.13799
Abstrakt: Oxygen concentrations are hypothesized to decrease in many areas of the ocean as a result of anthropogenically driven climate change, resulting in habitat compression for pelagic animals. The oxygen partial pressure, pO 2 , at which blood is 50% saturated (P 50 ) is a measure of blood oxygen affinity and a gauge of the tolerance of animals for low ambient oxygen. Tuna species display a wide range of blood oxygen affinities (i.e., P 50 values) and therefore may be differentially impacted by habitat compression as they make extensive vertical movements to forage on subdaily time scales. To project the effects of end-of-the-century climate change on tuna habitat, we calculate tuna P 50 depths (i.e., the vertical position in the water column at which ambient pO 2 is equal to species-specific blood P 50 values) from 21st century Earth System Model (ESM) projections included in the fifth phase of the Climate Model Intercomparison Project (CMIP5). Overall, we project P 50 depths to shoal, indicating likely habitat compression for tuna species due to climate change. Tunas that will be most impacted by shoaling are Pacific and southern bluefin tunas-habitat compression is projected for the entire geographic range of Pacific bluefin tuna and for the spawning region of southern bluefin tuna. Vertical shifts in P 50 depths will potentially influence resource partitioning among Pacific bluefin, bigeye, yellowfin, and skipjack tunas in the northern subtropical and eastern tropical Pacific Ocean, the Arabian Sea, and the Bay of Bengal. By establishing linkages between tuna physiology and environmental conditions, we provide a mechanistic basis to project the effects of anthropogenic climate change on tuna habitats.
(Published 2017. This article is a U.S. Government work and is in the public domain in the USA.)
Databáze: MEDLINE
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