Habitat-specific demography and source-sink dynamics in a population of Siberian jays

Magdalena Nystrand, M Griesser, Sonke Eggers, Jan Ekman

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22 Citations (Scopus)


There are a number of models describing population structure, many of which have the capacity to incorporate spatial habitat effects. One such model is the source-sink model, that describes a system where some habitats have a natality that is higher than mortality (source) and others have a mortality that exceeds natality (sink). A source can be maintained in the absence of migration, whereas a sink will go extinct. However, the interaction between population dynamics and habitat quality is complex, and concerns have been raised about the validity of published empirical studies addressing source-sink dynamics. In particular, some of these studies fail to provide data on survival, a significant component in disentangling a sink from a low quality source. Moreover, failing to account for a density-dependent increase in mortality, or decrease in fecundity, can result in a territory being falsely assigned as a sink, when in fact, this density-dependent suppression only decreases the population size to a lower level, hence indicating a pseudo-sink .
Original languageEnglish
Pages (from-to)266 - 274
Number of pages9
JournalJournal of Animal Ecology
Issue number1
Publication statusPublished - 2010

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