Detalles de la publicación.

Artículo

Año:2017
Autor(es):S. Tenan, M. Fasola, S. Volponi, G. Tavecchia,
Título:Conspecific and not performance-based attraction on immigrants drives colony growth in a waterbird.
Revista:JOURNAL OF ANIMAL ECOLOGY
ISSN:0021-8790
JCR Impact Factor:4.827
Volumen:86
Páginas:1074-1081
D.O.I.:doi:10.1111/1365-2656.12690
Web:http://onlinelibrary.wiley.com/doi/10.1111/1365-2656.12690/abstract
Resumen:
  1. Local recruitment and immigration play an important part in the dynamics and growth of animal populations. However, their estimation and incorporation into open populations models is, in most cases, problematic. We studied factors affecting the growth of a recently established colony of Eurasian spoonbill (Platalea leucorodia) and assessed the contribution of local recruits, i.e. birds born in the colony, and immigrants, i.e. birds of unknown origin, to colony growth.
  2. We applied an integrated population model that accounts for uncertainty in breeding state assignment and merges population surveys, local fecundity and individual longitudinal data of breeding and non-breeding birds, to estimate demographic rates and the relative role of recruitment and immigration in driving the local dynamics. We also used this analytical framework to assess the degree of support for the ʻperformance-basedʼ and ʻconspecific attractionʼ hypotheses as possible mechanisms of colony growth.
  3. Among the demographic rates, only immigration was positively and significantly correlated with population growth rate. In addition, the number of immigrants settling in the colony was positively correlated with colony size in the previous and current year, but was not correlated with fecundity of the previous year.
  4. Our results suggest that the variation in immigration affected colony dynamics and that conspecific attraction likely triggered the relevant role of immigration in the growth of a recently formed waterbird colony, supporting the need of including immigration in population analysis.

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