Compensatory immigration depends on adjacent population size and habitat quality but not on landscape connectivity

The Journal of Animal Ecology
Katrine Turgeon, Donald L Kramer

Abstract

1. Populations experiencing localized mortality can recover in the short term by net movement of individuals from adjacent areas, a process called compensatory immigration or spillover. Little is known about the factors influencing the magnitude of compensatory immigration or its impact on source populations. Such information is important for understanding metapopulation dynamics, the use of protected areas for conservation, management of exploited populations and pest control. 2. Using two small, territorial damselfish species (Stegastes diencaeus and S. adustus) in their naturally fragmented habitat, we quantified compensatory immigration in response to localized mortality, assessed its impact on adjacent source populations and examined the importance of potential immigrants, habitat quality and landscape connectivity as limiting factors. On seven experimental sites, we repeatedly removed 15% of the initial population size until none remained and immigration ceased. 3. Immigrants replaced 16-72% of original residents in S. diencaeus and 0-69% in S. adustus. The proportion of the source population that immigrated into depleted areas varied from 9% to 61% in S. diencaeus and from 3% to 21% in S. adustus. In S. diencaeus, compen...Continue Reading

Citations

Aug 1, 1980·Journal of Experimental Child Psychology·L G BraineL Relyea
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Related Concepts

Pomacentrus diencaeus
Stegastes adustus
Seasonal Variation
Coral Reefs
Underpopulation
Chromis chromis
Impacts, Environmental
Metazoa
Neomalthusianism
Sparus

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