Cerrar

No. de sistema: 000033638

LDR _ _ 00000nab^^2200409za^4500
008 _ _ 090512m20099999xx^^r^p^^^^^^z0^^^a0eng^d
040 _ _ a| ECO
c| ECO
043 _ _ a| n-mxg--
044 _ _ a| xx
245 0 0 a| Between introgression events and fragmentation, islands are the last refuge for the American crocodile in Caribbean Mexico
520 1 _ a| Habitat loss and degradation in the Mexican Caribbean, caused by the development of tourism, have decreased the potential nesting area for the American crocodile (Crocodylus acutus) and have fragmented the populations of the Yucatan peninsula. Our study investigated Wve populations (three continental: North, South, Sian Ka’an, and two insular: Cozumel, Banco Chinchorro) of C. acutus in the Mexican Caribbean using seven diVerent inter simple sequence repeat (ISSR) markers as tools for genetic variability and population diVerentiation. Three classiWcation methods were tested and compared: distance analysis, selforganizing map, and Bayesian methods, to evaluate the resolution of each method with ISSR markers. The 77 loci selected revealed a high variability between populations (polymorphism from 17% for Sian Ka’an to 75% for Banco Chinchorro) with a total polymorphism of 84% and a global coeYcient of gene diVerentiation (GST) of 0.296, but low values of Nei’s Gene diversity (from 0.065 for Sian Ka’an to 0.233 for Banco Chinchorro). Our results suggest elevated inbreeding in all local populations with higher indices for Banco Chinchorro and lower indices for Sian Ka’an. Three independent classiWcation methods gave similar results, and suggested that most continental individuals are admixtures, with diVerent levels of introgression, with the sympatric species Crocodylus moreletii. We propose that the islands/atolls remain the sole areas with genetically “pure” American crocodiles and we discuss these results for future conservation of this endangered crocodile species.
650 _ 4 a| Crocodylus acutus
650 _ 4 a| Construcción de nidos
650 _ 4 a| Inter secuencias simples repetidas
650 _ 4 a| Degradación ambiental
651 _ 4 a| Reserva de la Biosfera Sian Ka'an (Quintana Roo, México)
651 _ 4 a| Reserva de la Biosfera Banco Chinchorro (Quintana Roo, México)
651 _ 4 a| Yucatán (Península) (México)
700 1 _ a| Machkour M'Rabet, Salima
700 1 _ a| Hénaut, Yann
c| Dr.
e| coaut.
700 1 _ a| Charruau, Pierre Alexandre Rémy Robert
e| coaut.
700 1 _ a| Gevrey, Muriel
e| coaut.
700 1 _ a| Winterton, Peter
e| coaut.
n| 23029206400
700 1 _ a| Legal, Luc
e| coaut.
773 0 _
t| Marine Biology
g| Vol. 156, no. 6 (May 2009), p. 1321-1333
z| 0025-3162
902 _ _ a| GOG/Brenda
904 _ _ a| Julio 2010
905 _ _ a| Artecosur
905 _ _ a| Artfrosur
905 _ _ a| CRIIS
905 _ _ a| Biblioelectrónica
LNG eng
Cerrar
Between introgression events and fragmentation, islands are the last refuge for the American crocodile in Caribbean Mexico
Machkour M'Rabet, Salima (autor)
Hénaut, Yann (autor)
Charruau, Pierre Alexandre Rémy Robert (autor)
Gevrey, Muriel (autor)
Winterton, Peter (autor)
Legal, Luc (autor)
Contenido en: Marine Biology. Vol. 156, no. 6 (May 2009), p. 1321-1333. ISBN: 0025-3162
Bibliotecas:
Campeche , Chetumal , Tapachula , Villahermosa
No. de sistema: 33638
Tipo: Artículo


Inglés

"Habitat loss and degradation in the Mexican Caribbean, caused by the development of tourism, have decreased the potential nesting area for the American crocodile (Crocodylus acutus) and have fragmented the populations of the Yucatan peninsula. Our study investigated Wve populations (three continental: North, South, Sian Ka’an, and two insular: Cozumel, Banco Chinchorro) of C. acutus in the Mexican Caribbean using seven diVerent inter simple sequence repeat (ISSR) markers as tools for genetic variability and population diVerentiation. Three classiWcation methods were tested and compared: distance analysis, selforganizing map, and Bayesian methods, to evaluate the resolution of each method with ISSR markers. The 77 loci selected revealed a high variability between populations (polymorphism from 17% for Sian Ka’an to 75% for Banco Chinchorro) with a total polymorphism of 84% and a global coeYcient of gene diVerentiation (GST) of 0.296, but low values of Nei’s Gene diversity (from 0.065 for Sian Ka’an to 0.233 for Banco Chinchorro). Our results suggest elevated inbreeding in all local populations with higher indices for Banco Chinchorro and lower indices for Sian Ka’an. Three independent classiWcation methods gave similar results, and suggested that most continental individuals are admixtures, with diVerent levels of introgression, with the sympatric species Crocodylus moreletii. We propose that the islands/atolls remain the sole areas with genetically “pure” American crocodiles and we discuss these results for future conservation of this endangered crocodile species."

SIBE Campeche
Codigo de barra
Estado
Colección
33638-40
(Disponible)
Artículos de investigación ECOSUR
SIBE Chetumal
Codigo de barra
Estado
Colección
33638-30
(Disponible)
Artículos de investigación ECOSUR
SIBE Tapachula
Codigo de barra
Estado
Colección
33638-20
(Disponible)
Artículos de investigación ECOSUR
SIBE Villahermosa
Codigo de barra
Estado
Colección
33638-50
(Disponible)
Artículos de investigación ECOSUR