Knowledge Tree
resource availability
Also known as: Ecr, Eg
Facts (14)
Sources
Allostasis revisited: A perception, variation, and risk framework frontiersin.org Sep 28, 2022 12 facts
formulaPerturbation resistance potential (PRP) is calculated as Eg – (Ee + Ei), representing the difference between allostatic load and resource availability.
claimResource availability is designated as Eg or, cumulatively, Ecr. This designation improves alignment with known responses to negative energy balance and accounts for individual variation in body reserves and resource access, assuming more importance because the perception of this quantity is critical to estimating Perceived Resource Potential (PRP).
claimIn the allostasis model, the threshold for activating extreme conservation measures is defined by a narrowing scope between energetic requirements and resource availability, referred to as the Potential Resource Pool (PRP).
referenceExisting research methods for estimating resource availability are imprecise, require extensive knowledge of resource utilization, and fail to account for variability in resource access, according to Goymann and Wingfield (2004).
claimThe Perceived Resource Potential (PRP) describes the gap between allostatic load (Eload) and resource availability (Ecr), and is proposed to correlate with glucocorticoid levels rather than allostatic load itself.
formulaAllostatic overload Type 1 occurs when an animal is in a negative energy balance, specifically when the sum of all types of allostatic load exceeds resource availability (Eg).
claimExtended resource availability (Ecr) includes resource availability (Eg), endogenous energy reserves, and the degree of access to resources influenced by factors like social status and predation risk.
formulaResource availability (Eg) represents a limit to the energy an animal can expend without entering a negative energy balance and must be measured in the same units as allostatic load.
claimThe concept of Ecr includes resource availability (Eg), endogenous energy reserves, and the degree of access to resources influenced by factors such as social status and predation risk.
referenceThe Reactive Scope model focuses on the physiological actions of endocrine mediators and the mechanisms by which adaptive responses indicate and generate physiological damage, excluding Eg and PRP components.
claimResource availability is designated as Eg or, cumulatively, Ecr, which accounts for individual variation in body reserves and resource access.
referenceThe predictability of stressor delivery mutes the glucocorticoid response to other cues and positively affects resource availability by establishing intervals when foraging may be performed safely, according to Cyr and Romero (2009).
The role of Plant Foods in the evolution and Dispersal of early Humans kernsverlag.com Jul 30, 2022 1 fact
referenceDoran, D. M., McNeilage, A., Greer, D., Bocian, C., Mehlman, P., and Shah, N. (2002) studied Western Lowland Gorilla diet and resource availability, including cross-site comparisons and reflections on indirect sampling methods, published in the American Journal of Primatology 58(3), 91–116.
Ecologists Study the Interactions of Organisms and Their Environment nature.com 1 fact
claimCommunity ecologists study how resource availability influences ecosystem characteristics, including the number and types of species present.