The Evolutionary Logic of the Flock: How Resource Scarcity Drives Collective Sensing
A new theoretical perspective in Trends in Ecology & Evolution proposes that the evolution of collective behavior and social information use is fundamentally shaped by the variability of environmental resources. The authors argue that resource variability along three key axes—spatial distribution, temporal availability, and abundance—mediates the value of social cues for individual survival. This framework posits that social strategies become particularly advantageous when resources are patchy, ephemeral, and abundant, as these conditions amplify the risks of failing to find food and thus increase the payoff for sharing sensory information. By linking classical models of evolutionary ecology with modern studies of collective animal behavior, the hypothesis offers testable predictions for why sensory collectives emerge across diverse taxa, from insect swarms to bird flocks.
Study Significance: For researchers in evolutionary biology and ecology, this work provides a unifying hypothesis to explain the adaptive significance of collective sensing, directly connecting environmental selective pressures to the evolution of complex social behaviors. It shifts the focus from mechanistic “how” questions to functional “why” questions, offering a fresh lens to investigate phenomena like cooperative foraging, group migration, and the evolutionary arms race between predators and prey. The emphasis on variance minimization as a driver of sociality has implications for understanding life-history evolution, kin selection, and the stability of cooperative strategies in fluctuating environments.
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