Climate change in fish: effects of respiratory constraints on optimal life history and behaviour

Holt, Rebecca E.; Jørgensen, Christian

doi:10.1098/rsbl.2014.1032

Cited by 101 publications

(107 citation statements)

References 21 publications

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“…Indeed, the evidence for a significant positive latitudinal gradient in the effect of temperature upon bird populations alone (electronic supplementary material, figure S2) supports this assertion. The converse relationship for fishes suggests that population responses to temperature may be more negative in freshwater, particularly at higher latitudes, potentially because water temperature is negatively confounded with other environmental parameters, such as oxygen saturation, also important for many fish species [34].…”

Section: Discussionmentioning

confidence: 99%

Geographical variation in species' population responses to changes in temperature and precipitation

et al. 2015

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Despite increasing concerns about the vulnerability of species' populations to climate change, there has been little overall synthesis of how individual population responses to variation in climate differ between taxa, with trophic level or geographically. To address this, we extracted data from 132 long-term (greater than or equal to 20 years) studies of population responses to temperature and precipitation covering 236 animal and plant species across terrestrial and freshwater habitats. Our results identify likely geographical differences in the effects of climate change on populations and communities in line with macroecological theory. Temperature tended to have a greater overall impact on populations than precipitation, although the effects of increased precipitation varied strongly with latitude, being most positive at low latitudes. Population responses to increased temperature were generally positive, but did not vary significantly with latitude. Studies reporting significant climatic trends through time tended to show more negative effects of temperature and more positive effects of precipitation upon populations than other studies, indicating climate change has already impacted many populations. Most studies of climate change impacts on biodiversity have focused on temperature and are from middle to high northern latitudes. Our results suggest their findings may be less applicable to low latitudes.

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Section: Discussionmentioning

confidence: 99%

Geographical variation in species' population responses to changes in temperature and precipitation

et al. 2015

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“…The aerobic scope curves are likely to be different for different life stages, and evidence is accumulating that juveniles of ectotherms have higher temperature optima than adults (Ohlberger 2013). While recent work suggests that the optimal temperature for growth is likely to be less than that for aerobic scope due to temperaturedependent costs of locomotion and digestion (Holt and Jørgensen 2015), performance still displays a dome-shaped relationship to temperature and the different effect on adults and juveniles still holds. Finally, growth and development are governed by different processes and scale differently to temperature, where developmental rates appear to be more sensitive to temperature than growth (Forster et al 2011), and the size-fecundity relationship changes with temperature (Arendt 2011).…”

Section: Examplesmentioning

confidence: 99%

Trends and management implications of human‐influenced life‐history changes in marine ectotherms

et al. 2016

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Evidence is accumulating that many marine ectotherms are undergoing rapid changes in their life‐history characteristics. These changes have been variously attributed to fisheries‐induced evolution, inhibited adult growth rate due to oxygen limitation at higher temperatures, and plastic responses to density dependence or changes in ocean productivity. Here, we review the diverse underlying mechanisms by which plastic and evolutionary responses to climate change and fisheries are likely to produce similar life‐history trends in harvested marine ectotherms, leading to faster life‐histories with earlier maturation and smaller adult size‐at‐age. While mechanistically understanding these growth and maturation changes may be difficult, it is becoming clear that changing life‐histories will lead to modified population dynamics, productivity and natural mortality of the affected species. We discuss how the observed and expected life‐history changes could affect the assumptions and uncertainty within single and multispecies models currently used in marine ecosystem management, highlighting that models which allow for dynamic life‐history traits often report significantly different estimates of stock biomass. Given that both climate‐ and harvest‐induced life‐history changes are likely to intensify and possibly amplify each other, there is an urgent need to adequately assess the implications of faster life‐histories for marine ecosystem management. This is especially true for data‐poor stocks, where growth and maturation are not regularly assessed. Targeted monitoring can be used to inform responsive management, but for improved sustainability outcomes, a precautionary approach to management that is robust to life‐history trends is advised.

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“…budgets may occur (see Holt and Jorgensen, 2015; for an early example of how starvation modifies thermal performance and optima in salmonids, see Brett, 1971). OCLTT principles are presently integrated into models predicting the effects of climate on species' distributions and the consequences for ecosystems (e.g.…”

Section: Sublethal Limitsmentioning

confidence: 99%

Oxygen- and capacity-limited thermal tolerance: bridging ecology and physiology

Pörtner

Bock

Mark

2017

Journal of Experimental Biology

479

367

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Observations of climate impacts on ecosystems highlight the need for an understanding of organismal thermal ranges and their implications at the ecosystem level. Where changes in aquatic animal populations have been observed, the integrative concept of oxygen-and capacitylimited thermal tolerance (OCLTT) has successfully characterised the onset of thermal limits to performance and field abundance. The OCLTT concept addresses the molecular to whole-animal mechanisms that define thermal constraints on the capacity for oxygen supply to the organism in relation to oxygen demand. The resulting 'total excess aerobic power budget' supports an animal's performance (e.g. comprising motor activity, reproduction and growth) within an individual's thermal range. The aerobic power budget is often approximated through measurements of aerobic scope for activity (i.e. the maximum difference between resting and the highest exerciseinduced rate of oxygen consumption), whereas most animals in the field rely on lower (i.e. routine) modes of activity. At thermal limits, OCLTT also integrates protective mechanisms that extend time-limited tolerance to temperature extremes -mechanisms such as chaperones, anaerobic metabolism and antioxidative defence. Here, we briefly summarise the OCLTT concept and update it by addressing the role of routine metabolism. We highlight potential pitfalls in applying the concept and discuss the variables measured that led to the development of OCLTT. We propose that OCLTT explains why thermal vulnerability is highest at the whole-animal level and lowest at the molecular level. We also discuss how OCLTT captures the thermal constraints on the evolution of aquatic animal life and supports an understanding of the benefits of transitioning from water to land.

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Climate change in fish: effects of respiratory constraints on optimal life history and behaviour

Cited by 101 publications

References 21 publications

Geographical variation in species' population responses to changes in temperature and precipitation

Geographical variation in species' population responses to changes in temperature and precipitation

Trends and management implications of human‐influenced life‐history changes in marine ectotherms

Oxygen- and capacity-limited thermal tolerance: bridging ecology and physiology

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