Sources, Sinks, and Population Regulation.

Pulliam, H. R. (1988). Sources, Sinks, and Population Regulation. The American Naturalist, 132(5), 652-661.

Type

Journal article

Intellectual base

Primary research

Year

1988

DOI

10.1086/284880

Link

https://doi.org/10.1086/284880

Cited from

marine_science

Cited by

2 citations across 2 artifacts.

Each citation links to the sentence it supports in the citing article.

Primes

• Source-Sink Dynamics
  • The masking effect falls straight out of the algebra: at equilibrium B's standing population is held constant by the import, \(0 = (\lambda_B - 1)N_B + m N_A\), so an observer counting animals in B sees a stable, healthy-looking population and would never infer \(\lambda_B < 1\) from the headcount alone — the import exactly masks the local deficit.

Mechanisms

• Metapopulation Model
  • - Parameterize each patch by its unaided rate. Every patch carries a local net rate of production versus loss, estimated without imports, so sources (surplus) and sinks (deficit) separate on their own demographics rather than on how full they currently are.

    This sourceDefines sources and sinks from local demographic production versus mortality, with sinks remaining locally deficient even when immigration maintains them.

Verification

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