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1.
Nat Commun ; 14(1): 7379, 2023 Nov 27.
Article in English | MEDLINE | ID: mdl-38012173

ABSTRACT

Changing environmental temperatures impact the physiological performance of fishes, and consequently their distributions. A mechanistic understanding of the linkages between experienced temperature and the physiological response expressed within complex natural environments is often lacking, hampering efforts to project impacts especially when future conditions exceed previous experience. In this study, we use natural chemical tracers to determine the individual experienced temperatures and expressed field metabolic rates of Atlantic bluefin tuna (Thunnus thynnus) during their first year of life. Our findings reveal that the tuna exhibit a preference for temperatures 2-4 °C lower than those that maximise field metabolic rates, thereby avoiding temperatures warm enough to limit metabolic performance. Based on current IPCC projections, our results indicate that historically-important spawning and nursery grounds for bluefin tuna will become thermally limiting due to warming within the next 50 years. However, limiting global warming to below 2 °C would preserve habitat conditions in the Mediterranean Sea for this species. Our approach, which is based on field observations, provides predictions of animal performance and behaviour that are not constrained by laboratory conditions, and can be extended to any marine teleost species for which otoliths are available.


Subject(s)
Ecosystem , Tuna , Animals , Tuna/physiology , Atlantic Ocean , Global Warming , Mediterranean Sea
2.
Science ; 352(6284): 423, 2016 Apr 22.
Article in English | MEDLINE | ID: mdl-27102475

ABSTRACT

Palmer et al and Swain et al suggest that our "extra mortality" time series is spurious. In response, we show that including temperature-dependent mortality improves abundance estimates and that warming waters reduce growth rates in Gulf of Maine cod. Far from being spurious, temperature effects on this stock are clear, and continuing to ignore them puts the stock in jeopardy.


Subject(s)
Adaptation, Physiological , Fisheries , Gadus morhua/physiology , Global Warming , Animals
3.
Science ; 350(6262): 809-12, 2015 Nov 13.
Article in English | MEDLINE | ID: mdl-26516197

ABSTRACT

Several studies have documented fish populations changing in response to long-term warming. Over the past decade, sea surface temperatures in the Gulf of Maine increased faster than 99% of the global ocean. The warming, which was related to a northward shift in the Gulf Stream and to changes in the Atlantic Multidecadal Oscillation and Pacific Decadal Oscillation, led to reduced recruitment and increased mortality in the region's Atlantic cod (Gadus morhua) stock. Failure to recognize the impact of warming on cod contributed to overfishing. Recovery of this fishery depends on sound management, but the size of the stock depends on future temperature conditions. The experience in the Gulf of Maine highlights the need to incorporate environmental factors into resource management.


Subject(s)
Adaptation, Physiological , Fisheries , Gadus morhua/physiology , Global Warming , Animals , Hot Temperature , Maine , Population Dynamics
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