Why Offspring in Nonhuman Families Differ

Forbes, Scott

doi:10.1177/147470491301100303

Cited by 3 publications

(1 citation statement)

References 80 publications

(146 reference statements)

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“…Our results suggest that the thermal environment can impose differential costs and constraints on offspring within the same brood. That siblings could experience dramatically different conditions, potentially living side by side in different worlds, has deep implications for the study of sibling rivalry (Forbes ). It suggests that one of the context‐dependent consequences of nest cup heterogeneity may be conflict for a thermal resource in which sibling competition mediates differences in survival rates through the thermal environment.…”

Section: Discussionmentioning

confidence: 99%

Context‐dependent costs and constraints of begging and non‐begging activity by common grackle nestlings at the scale of the nanoclimate

2014

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Summary1. Environmental factors such as heat and solar radiation directly affect the open-cup nest environment and can impact nestling body temperature. 2. The aim of our research was to understand how open-cup passerine nestlings use behavioural thermoregulation to mitigate solar heat gain and to measure the metabolic cost of begging and non-begging activity under three light treatments: room light (<2 Wm À2 ), simulated shade (500 Wm À2 ) and simulated sun (1000 Wm À2 ). Our study coupled behavioural (field) and physiological (laboratory) experiments to explore the adaptive behavioural response of passerine nestlings to nest cup nanoclimates (sun and shade), using the common grackle (Quiscalus quiscula) as a model species.3. Non-begging behaviour was evaluated in the field by randomly assigning nestlings to a homogeneous (all sun) or heterogeneous (sun and shade) nest environment; measuring body temperature (T b ); and identifying behaviours from videotaped footage. The T b of nestlings without access to shade was significantly higher, and nestlings spent more time moving and panting, suggesting an increased metabolic expenditure. To test this, we duplicated the insolation nanoclimate under laboratory conditions using a 1Á0 KW Sciencetech Illumination System and measured the energetic cost of begging and non-begging activity using open-system respirometry on non-irradiated and irradiated nestlings. Our results suggest that, in grackle nestlings, the relationship between activity (begging and non-begging) and energy expenditure is context-dependent. 4. Our results identified: (i) a reduction in energy expenditure associated with accessing the shade; (ii) expenditure on non-begging activity equalled or exceeded expenditure on begging activity; and (iii) a potential behavioural constraint on begging imposed by exposure to a homogeneous sun environment (sun without access to shade). The combination of contextdependent costs and constraints suggests the potential for strategic costs associated with the heterogeneous nest environment.

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Section: Discussionmentioning

confidence: 99%

Context‐dependent costs and constraints of begging and non‐begging activity by common grackle nestlings at the scale of the nanoclimate

2014

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Asymmetric sibling rivalry extends to hosts and brood parasites

Forbes

Glassey

Wiebe

2022

Behav Ecol Sociobiol

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An Introduction to Comparative Evolutionary Psychology

Vonk

Shackelford

2013

Evol Psychol

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Previously we (Vonk and Shackelford, 2012, in press) proposed an integration of comparative psychology and evolutionary psychology into a new field of "comparative evolutionary psychology." This integrative discipline incorporates principles from ethology, ecology, biology, anthropology, and psychology, broadly defined. We present in this special issue a collection of original empirical and theoretical review articles in which leading researchers propose ways to successfully integrate comparative and evolutionary approaches within their particular areas of study. We showcase the key contributions of these articles and highlight several empirical and theoretical challenges, as well as key future directions, for comparative evolutionary psychology. A Unified Comparative Evolutionary PsychologyRecently, Vonk and Shackelford (2012) proposed a unification of comparative psychology and evolutionary psychology into a new field, comparative evolutionary psychology. Although this was not the first of such proposals, Vonk and Shackelford's was more integrative than prior proposals (see Burghardt, this issue). Our primary emphasis was to bridge some of the gaps between researchers with disparate goals and approaches. For instance, we proposed that a focus on evolutionary theory with a comparative approach can help to integrate the work of field researchers and laboratory researchers, human-centered researchers and researchers of animals, behaviorists and cognitivists, and nomothetic researchers and ideographic researchers. We noted that both comparative psychologists and evolutionary psychologists sometimes adopt too narrow a focus; either neglecting interesting differences between species in the search for continuity (comparative psychology) or neglecting other species altogether (evolutionary psychology), sometimes with a blind eye to the phylogenetic history of our own and other species.Introduction to comparative evolutionary psychology

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Why Offspring in Nonhuman Families Differ

Cited by 3 publications

References 80 publications

Context‐dependent costs and constraints of begging and non‐begging activity by common grackle nestlings at the scale of the nanoclimate

Context‐dependent costs and constraints of begging and non‐begging activity by common grackle nestlings at the scale of the nanoclimate

Asymmetric sibling rivalry extends to hosts and brood parasites

An Introduction to Comparative Evolutionary Psychology

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