Jensen’s inequality and optimal life history strategies in stochastic environments

Pásztor, Líz; Kisdi, Éva; Meszéna, Géza

doi:10.1016/s0169-5347(99)01801-7

Cited by 23 publications

(22 citation statements)

References 7 publications

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“…For convex reaction norms (second derivative>0), Jensen's inequality (Hölder 1889, Jensen 1906) guarantees that environmental variation will produce non‐additive (skewed) variability in a demographic parameter that increases its temporal mean relative to performance in a constant environment (Fig. 1, dashed green lines; see also Real and Ellner 1992, Pásztor et al 2000), which will subsequently enhance fitness and select for demographic lability if increases by a large enough amount to offset the deleterious impacts of σ 2 (Eq. 1).…”

Section: The Adaptive Basis For Demographic Labilitymentioning

confidence: 99%

Is life‐history buffering or lability adaptive in stochastic environments?

Koons¹,

Pavard²,

Baudisch³

et al. 2009

Oikos

137

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International audienceIt is commonly thought that temporal fluctuations in demographic parameters should be selected against because of the deleterious impacts variation can have on fitness. A critical underpinning of this prediction is the assumption that changes in environmental conditions map linearly into changes in demographic parameters over time. We detail why this assumption may often break down and why selection should not always favor buffering of demographic parameters against environmental stochasticity. To the contrary, nonlinear relationships between the environment and demographic performance can produce asymmetric temporal variation in demographic parameters that actually enhances fitness. We extend this result to structured populations using simulation and show that ‘demographic lability' rather than ‘buffering' may be adaptive, particularly in organisms with low juvenile or adult survival. Finally, we review previous ecological work, and indicate cases where ‘demographic lability' may be adaptive, then conclude by identifying research that is needed to develop a theory of life-history evolution that encompasses both demographic buffering and lability

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Section: The Adaptive Basis For Demographic Labilitymentioning

confidence: 99%

Is life‐history buffering or lability adaptive in stochastic environments?

Koons¹,

Pavard²,

Baudisch³

et al. 2009

Oikos

137

View full text Add to dashboard Cite

show abstract

“…Jensen's inequality predicts that when the thermal performance curve is concave (in the cold part of curve) the organism should present a higher fitness under constant than fluctuating temperature with the same mean. On the contrary, if the thermal performance curve is convex (the hot part of curve) the organism is expected to have a higher fitness under fluctuating than constant temperature (Pasztor et al, 2000;Foray et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Effects of daily fluctuating temperatures on the Drosophila–Leptopilina boulardi parasitoid association

Delava

Fleury

Gibert

2016

Journal of Thermal Biology

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“…Rastetter et al, 1992;Kicklighter et al, 1994;Ruel and Ayres, 1999;Pasztor et al, 2000;Knapp et al, 2002;Jentsch et al, 2007), studies looking at the effects of climate change on ecosystem function have given perhaps too much attention to changes in the average climate, but not to the full probability distribution of the climate system. The findings of this study can greatly modify past predictions about the effects of future average temperatures on ecosystem respiration, especially for large temporal and spatial scales.…”

Section: Discussionmentioning

confidence: 99%

Amplification and dampening of soil respiration by changes in temperature variability

et al. 2011

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Abstract. Accelerated release of carbon from soils is one of the most important feedbacks related to anthropogenically induced climate change. Studies addressing the mechanisms for soil carbon release through organic matter decomposition have focused on the effect of changes in the average temperature, with little attention to changes in temperature variability. Anthropogenic activities are likely to modify both the average state and the variability of the climatic system; therefore, the effects of future warming on decomposition should not only focus on trends in the average temperature, but also variability expressed as a change of the probability distribution of temperature. Using analytical and numerical analyses we tested common relationships between temperature and respiration and found that the variability of temperature plays an important role determining respiration rates of soil organic matter. Changes in temperature variability, without changes in the average temperature, can affect the amount of carbon released through respiration over the longterm. Furthermore, simultaneous changes in the average and variance of temperature can either amplify or dampen the release of carbon through soil respiration as climate regimes change. These effects depend on the degree of convexity of the relationship between temperature and respiration and the magnitude of the change in temperature variance. A potential consequence of this effect of variability would be higher respiration in regions where both the mean and variance of temperature are expected to increase, such as in some low latitude regions; and lower amounts of respiration where the average temperature is expected to increase and the variance to decrease, such as in northern high latitudes.

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Jensen’s inequality and optimal life history strategies in stochastic environments

Cited by 23 publications

References 7 publications

Is life‐history buffering or lability adaptive in stochastic environments?

Is life‐history buffering or lability adaptive in stochastic environments?

Effects of daily fluctuating temperatures on the Drosophila–Leptopilina boulardi parasitoid association

Amplification and dampening of soil respiration by changes in temperature variability

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