What question did this study set out to answer?

To evaluate the theoretical consequences of dispersal on total population size and determine how spatial versus temporal environmental variation shapes the evolution of emigration strategies.

March 1, 1971Ecology

Dispersal: Population Consequences and Evolution

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Authors

MGMadhav GadgilMissouri Department of Conservation

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Implication

Theoretical modeling reveals how dispersal and variable carrying capacities depress total abundance across local habitats, indicating evolutionary trade-offs between spatial and temporal emigration.

Key Points

To evaluate the theoretical consequences of dispersal on total population size and determine how spatial versus temporal environmental variation shapes the evolution of emigration strategies.
Formulated a theoretical mathematical framework modeling organism dispersal across an interconnected network of discrete local habitat sites.
Simulated the interaction between spatial heterogeneity and temporal fluctuations in site carrying capacities to analyze population depression and density-dependent emigration.
Dispersal leads to lower crowding in isolated patches relative to accessible sites, generating spatial variance in density that depresses total species abundance across its entire range.
Temporal variation in carrying capacity analogously depresses mean population size compared to stable environmental conditions.
Spatial variation in carrying capacity favors a sensitive, density-dependent emigration rate with a small fraction dispersing, whereas temporal variation favors dispersing a larger fraction that is less sensitive to crowding.

Cite This Study

Madhav Gadgil (1971) studied this question.

synapsesocial.com/papers/6a17fc18aeefdf6d9c13399c https://doi.org/10.2307/1934583

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Implication

Theoretical modeling reveals how dispersal and variable carrying capacities depress total abundance across local habitats, indicating evolutionary trade-offs between spatial and temporal emigration.

Dispersal: Population Consequences and Evolution

Discussion

Member takes

Implication

Key Points

Cite This Study

Dispersal: Population Consequences and Evolution

Discussion

Member takes

Implication

Key Points

Cite This Study

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