Dispersal of introduced house sparrows Passer domesticus: an experiment.
Proc Biol Sci
; 274(1619): 1763-71, 2007 Jul 22.
Article
en En
| MEDLINE
| ID: mdl-17490946
ABSTRACT
An important issue concerning the introduction of non-indigenous organisms into local populations is the potential of the introduced individuals to spread and interfere both demographically and genetically with the local population. Accordingly, the potential of spatial dispersal among introduced individuals compared with local individuals is a key parameter to understand the spatial and temporal dynamics of populations after an introduction event. In addition, if the variance in dispersal rate and distance is linked to individual characteristics, this may further affect the population dynamics. We conducted a large-scale experiment where we introduced 123 house sparrows from a distant population into 18 local populations without changing population density or sex ratio. Introduced individuals dispersed more frequently and over longer distances than residents. Furthermore, females had higher probability of dispersal than males. In females, there was also a positive relationship between the wing length and the probability of dispersal and dispersal distance. These results suggest that the distribution and frequency of introduced individuals may be predicted by their sex ratio as well as their phenotypic characteristics.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Fenotipo
/
Demografía
/
Gorriones
Tipo de estudio:
Prognostic_studies
/
Risk_factors_studies
Límite:
Animals
País/Región como asunto:
Europa
Idioma:
En
Revista:
Proc Biol Sci
Asunto de la revista:
BIOLOGIA
Año:
2007
Tipo del documento:
Article
País de afiliación:
Noruega