Variation in temperature increases the cost of living in birds

Pendlebury, C. J.; Macleod, M.D.; Bryant, David M.

doi:10.1242/jeb.00999

Cited by 26 publications

(20 citation statements)

References 42 publications

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“…comm. ); high windspeed and high temperature variations were additional factors that substantially increased expenditure (Pendlebury, MacLeod & Bryant 2004; McKinney & McWilliams 2005). Although such dramatic (sustained) changes in temperature are not expected to occur, more frequent extreme weather events might increase energy expenditure at least temporarily and/or locally and thus lead to behavioural adjustments, as suggested by our study.…”

Section: Discussionmentioning

confidence: 99%

The consequences of climate‐driven stop‐over sites changes on migration schedules and fitness of Arctic geese

Bauer

Dinther

Høgda

et al. 2008

Journal of Animal Ecology

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Summary 1.How climatic changes affect migratory birds remains difficult to predict because birds use multiple sites in a highly interdependent manner. A better understanding of how conditions along the flyway affect migration and ultimately fitness is of paramount interest. 2. Therefore, we developed a stochastic dynamic model to generate spatially and temporally explicit predictions of stop-over site use. For each site, we varied energy expenditure, onset of spring, intake rate and day-to-day stochasticity independently. We parameterized the model for the migration of pink-footed goose Anser brachyrhynchus from its wintering grounds in Western Europe to its breeding grounds on Arctic Svalbard. 3. Model results suggested that the birds follow a risk-averse strategy by avoiding sites with comparatively high energy expenditure or stochasticity levels in favour of sites with highly predictable food supply and low expenditure. Furthermore, the onset of spring on the stop-over sites had the most pronounced effect on staging times while intake rates had surprisingly little effect. 4. Subsequently, using empirical data, we tested whether observed changes in the onset of spring along the flyway explain the observed changes in migration schedules of pink-footed geese from 1990 to 2004. Model predictions generally agreed well with empirically observed migration patterns, with geese leaving the wintering grounds earlier while considerably extending their staging times in Norway.

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Section: Discussionmentioning

confidence: 99%

The consequences of climate‐driven stop‐over sites changes on migration schedules and fitness of Arctic geese

Bauer

Dinther

Høgda

et al. 2008

Journal of Animal Ecology

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“…they would have relatively lower capacity to digest their food, as implied by the longer time that they had to keep the food in their digestive system compared with females. Alternatively, it might be that females are simply designed with relatively higher digestive capacity because it is they, and not males, that must increase intake during egg production (Pendlebury et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Sex differences in food intake and digestive constraints in a nectarivorous bird

Markman

Tadmor-Melamed

Arieli

et al. 2006

Journal of Experimental Biology

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SUMMARY Sex-specific foraging behaviour might be influenced by digestive constraints. However, evidence for sex differences in digestive performance is limited. Various physiological traits are known to be body size dependent. Therefore, we hypothesized that body size differences between male and female birds may lead to differences in their digestive characteristics. We predicted that if food intake and digestive functions are only governed by body mass,then males that are heavier than females would have higher food intake, food assimilation efficiency and gut transit time, but not after controlling for the effect of body mass. We fed a diet of equicaloric solutions of sucrose and a 1:1 mixture of glucose and fructose (hexose mixture) solutions to Palestine sunbirds(Nectarinia osea). When fed sucrose solutions, males had longer transit times but similar absorption efficiencies as females. Transit times,corrected for differences in body mass and food intake, were still longer in males than in females when fed on sucrose solutions. The sex-specific differences in transit time disappeared when the birds were fed the hexose mixture. Our results suggest that males take longer to digest than females when fed on sucrose-rich nectars as opposed to hexose-rich nectars, and therefore can allow themselves a relatively lower digestive capacity. This may suggest sex-specific co-evolution of sunbirds within mixed plant communities, which have both sucrose- and hexose-rich nectar-producing plants. Furthermore,future studies on digestion in birds may pay attention to sex-specific differences.

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“…Indeed, recent studies suggest that increases in temperature variability may pose a larger threat to ectotherms than the shift in average temperature as the planet warms Terblanche et al, 2010;Vasseur et al, 2014). [Increased temperature variation may also have negative fitness consequences for endotherms such as birds (Pendlebury et al, 2004). ]…”

Section: Reviewmentioning

confidence: 99%

Thermal variation, thermal extremes and the physiological performance of individuals

Dowd

King

Denny

2015

Journal of Experimental Biology

227

211

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In this review we consider how small-scale temporal and spatial variation in body temperature, and biochemical/physiological variation among individuals, affect the prediction of organisms' performance in nature. For 'normal' body temperatures -benign temperatures near the species' mean -thermal biology traditionally uses performance curves to describe how physiological capabilities vary with temperature. However, these curves, which are typically measured under static laboratory conditions, can yield incomplete or inaccurate predictions of how organisms respond to natural patterns of temperature variation. For example, scale transition theory predicts that, in a variable environment, peak average performance is lower and occurs at a lower mean temperature than the peak of statically measured performance. We also demonstrate that temporal variation in performance is minimized near this new 'optimal' temperature. These factors add complexity to predictions of the consequences of climate change. We then move beyond the performance curve approach to consider the effects of rare, extreme temperatures. A statistical procedure (the environmental bootstrap) allows for longterm simulations that capture the temporal pattern of extremes (a Poisson interval distribution), which is characterized by clusters of events interspersed with long intervals of benign conditions. The bootstrap can be combined with biophysical models to incorporate temporal, spatial and physiological variation into evolutionary models of thermal tolerance. We conclude with several challenges that must be overcome to more fully develop our understanding of thermal performance in the context of a changing climate by explicitly considering different forms of small-scale variation. These challenges highlight the need to empirically and rigorously test existing theories.

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Variation in temperature increases the cost of living in birds

Cited by 26 publications

References 42 publications

The consequences of climate‐driven stop‐over sites changes on migration schedules and fitness of Arctic geese

The consequences of climate‐driven stop‐over sites changes on migration schedules and fitness of Arctic geese

Sex differences in food intake and digestive constraints in a nectarivorous bird

Thermal variation, thermal extremes and the physiological performance of individuals

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