Individual differences in the use of social information in foraging by captive great tits

Marchetti, Chiara; Drent, Piet J.

doi:10.1006/anbe.2000.1443

Cited by 270 publications

(172 citation statements)

References 25 publications

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“…In addition, the unique environment surrounding the colony (i.e., marshes of Doñana National Park) offers high predictability and abundance of food resources. Our results, therefore, concur with a conceptual framework that predicts selection of low GC responders, proactive phenotypes under similar environmental scenarios (13,27,28), and provides a parsimonious evolutionary explanation for the reported link between fitness and adrenocortical function.…”

Section: Resultssupporting

confidence: 86%

“…On the other hand, reactive individuals (also called shy, cooperative, dove personalities or slow explorers) are characterized by high GC secretion but low sympathetic activation in response to stress that facilitate the ''freeze and hide'' coping strategy (10,12,13,24,25). The success of proactive vs. reactive coping strategies is postulated to vary as a function of population density and predictability of food resources, with proactive individuals being more successful when density is high and food is stable and abundant (13,25,27,28). Interestingly, our study colony of white storks has experienced a pronounced growth during the last 25 years, and with Ϸ400 nests is currently the largest Spanish colony (29), and surely one of the largest and most dense in the world.…”

Section: Resultsmentioning

confidence: 99%

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Stress response during development predicts fitness in a wild, long lived vertebrate

Blas

Bortolotti

Tella

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

300

222

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Short-term elevation of circulating glucocorticosteroids (GCs) in vertebrates facilitates the adoption of a distinct emergency life history state, which allows individuals to cope with perturbations and recover homeostasis at the expense of temporarily suppressing nonessential activities. Although GC responses are viewed as a major evolutionary mechanism to maximize fitness through stress management, phenotypic variability exists within animal populations, and it remains unclear whether interindividual differences in stress physiology can explain variance in unequivocal components of fitness. We show that the magnitude of the adrenocortical response to a standardized perturbation during development is negatively related to survival and recruitment in a wild population of long lived birds. Our results provide empirical evidence for a link between stress response, not exposure to stressors, and fitness in a vertebrate under natural conditions. Recent studies suggest that variability in the adrenocortical response to stress may be maintained if high and low GC responders represent alternative coping strategies, with differential adaptive value depending on environmental conditions. Increased fitness among low GC responders, having a proactive personality, is predicted under elevated population density and availability of food resources, conditions that characterize our study population.animal personality ͉ corticosterone ͉ glucocorticosteroids ͉ reproduction ͉ survival E xposure to environmental perturbations constitutes a major selective force in natural populations. Animals have evolved behavioral and physiological strategies to avoid the deleterious effects of stressors, and among vertebrates, the adrenocortical response is one of the most conserved physiological mechanisms aimed at this end (1-3). In response to modifying factors (e.g., decreased food resources, predation, harsh weather), vertebrates activate the hypothalamous-pituitary-adrenal axis, which triggers a rapid release of glucocorticosteroids (GCs) from the adrenal glands into the bloodstream (4). Elevations of circulating GCs, in turn, redirect individuals into a distinct emergency life history state (3) with changes in physiology and behavior (e.g., increased gluconeogenesis and mobilization of fat stores, suppressed territorial and reproductive behavior, irruptive migration; refs. 2 and 4), aimed at coping with the perturbation and recovering homeostasis at the expense of temporarily suppressing nonessential activities. The quantification of circulating GC titers has become a useful tool in psychology, animal husbandry, and conservation biology because elevations of plasma levels constitute a physiological marker of exposure to stress (e.g., refs. 5-7), and the latter has deleterious effects on fitness. However, even within animal populations exposed to constant environments there is a strong interindividual variability in the adrenocortical response to standardized stressors (8-10), and it remains unknown whether such natural variability exerts ...

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Stress response during development predicts fitness in a wild, long lived vertebrate

Blas

Bortolotti

Tella

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

300

222

View full text Add to dashboard Cite

show abstract

“…various factors such as experience may also be important), learning may be the only feasible way to choose a strategy in relation to phenotypic asymmetries. This may be consistent with the observed correlations between being fast, aggressive or an efficient forager, and the tendency to scrounger [46][47][48]. The result may appear to be a consistent correlation between a group of physical and behavioural traits known as animal personality (see [45,[49][50][51], for review).…”

Section: Discussionsupporting

confidence: 73%

Evolution of learned strategy choice in a frequency-dependent game

et al. 2011

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In frequency-dependent games, strategy choice may be innate or learned. While experimental evidence in the producer -scrounger game suggests that learned strategy choice may be common, a recent theoretical analysis demonstrated that learning by only some individuals prevents learning from evolving in others. Here, however, we model learning explicitly, and demonstrate that learning can easily evolve in the whole population. We used an agent-based evolutionary simulation of the producer -scrounger game to test the success of two general learning rules for strategy choice. We found that learning was eventually acquired by all individuals under a sufficient degree of environmental fluctuation, and when players were phenotypically asymmetric. In the absence of sufficient environmental change or phenotypic asymmetries, the correct target for learning seems to be confounded by game dynamics, and innate strategy choice is likely to be fixed in the population. The results demonstrate that under biologically plausible conditions, learning can easily evolve in the whole population and that phenotypic asymmetry is important for the evolution of learned strategy choice, especially in a stable or mildly changing environment.

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“…Finally, in systems with social learning, there appear to be individual differences in tendency to rely on individual-based learning (using personal, private information) as opposed to social learning (using public information (Galef and Giraldeau, 2001;Marchetti and Drent, 2000;Valone, 2007). Some of the variation in tendency to learn from others is associated with age; for example in mate copying, younger, inexperienced females tend to copy the mate preferences of older females rather than rely on their own assessments of mate quality (Amlacher and Dugatkin, 2005;Dugatkin and Godin, 1993).…”

Section: B Learningmentioning

confidence: 99%