Titre du document / Document title

A remnant population of the Floreana mockingbird on Champion island, Galápagos

Auteur(s) / Author(s)

GRANT P. R. ⁽¹⁾ ; CURRY R. L. ⁽²⁾ ; GRANT B. R. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544-1003, ETATS-UNIS
⁽²⁾ Department of Biology, 800 Lancaster Ave., Villanova University, Villanova PA 19085, ETATS-UNIS

Résumé / Abstract

Champion and Gardner are the only two satellite islands of Floreana in the Galapagos archipelago that support populations of the Floreana mockingbird, Nesomimus trifasciatus. The population on the much larger island of Floreana became extinct approximately 125 years ago. We studied the Champion population in every year from 1980 to 1991. Since the island is small (9.4 ha) we determined the demographic stability of the population by repeated censusing of the whole population. The number of breeding adults varied from 16 to 24 with a mean of ∼20. Using a standard population genetics formula we calculate that the Champion population has lost half of the original level of selectively neutral heterozygosity since presumed immigration from Floreana ceased more than a century ago. The short-term future of the Champion population is likely to be secure providing that goats and rats are not introduced, as these have caused much devastation on Floreana and probably resulted in the extinction of the mockingbird population there.

Revue / Journal Title

Biological conservation   ISSN 0006-3207   CODEN BICOBK 

Source / Source

2000, vol. 92, n^o3, pp. 285-290 (42 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Oxford, ROYAUME-UNI  (1968) (Revue)

Mots-clés anglais / English Keywords

Population dynamics ; Stability ; Population genetics ; Loss of heterozygosity ; Island ; Galapagos Islands ; Remnant population ; Pacific Ocean Islands ; Animal conservation ; Aves ; Vertebrata ;

Mots-clés français / French Keywords

Dynamique population ; Stabilité ; Génétique population ; Perte hétérozygotie ; Ile ; Galapagos ; Nesomimus trifasciatus ; Population relicte ; Iles Océan Pacifique ; Protection faune ; Aves ; Vertebrata ;

Mots-clés espagnols / Spanish Keywords

Dinámica población ; Estabilidad ; Genética población ; Pérdida heterozigosis ; Isla ; Galápagos ; Islas Océano Pacífico ; Protección fauna ; Aves ; Vertebrata ;

Localisation / Location

INIST-CNRS, Cote INIST : 14169, 35400008191521.0030