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A hybrid zone of two toad sister species, Rhinella atacamensis and R. arunco (Anura: Bufonidae), defined by a consistent altitudinal segregation in watersheds RChHN
CORREA,CLAUDIO; MÉNDEZ,MARCO A; ARAYA,SERGIO; LOBOS,GABRIEL; PALMA,R. EDUARDO.
Delimiting the spatial extension of a hybrid zone is essential to understand its historical origin and to identify the geographical and/or environmental factors which delimit it. Rhinella atacamensis and R. arunco are two sister species which together inhabit Chile between 25° and 38° S. Their distribution limits coincide at about 32° S, where recently it was reported that they hybridize in a small watershed (Pupío creek). Although the genetic evidence suggests that these two species form a hybrid swarm, they are not mixed homogeneously in the entire watershed, but rather are spatially segregated: R. arunco is found in the lower part of the creek and R. atacamensis in the higher part. An extensive exploration north and south of 32° S revealed other...
Tipo: Journal article Palavras-chave: AFLP markers; Chile; Control region; Hybridization; Toads.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000200001
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Hemoglobin affinity for oxygen in three subspecies of toads (Bufo sp.) living at different altitudes Biol. Res.
OSTOJIC,HRVOJ; MONGE-C,CARLOS; CIFUENTES,VERONICA.
Blood oxygen affinity and red blood cell properties were measured in three subspecies of genus Bufo: Bufo spinulosus limensis, collected at sea level and at an average day temperature of 20ºC; Bufo spinulosus trifolium, from 3100 m, average day temperature of 15ºC; and Bufo spinulosus flavolineatus, from 4100 m, average day temperature of 10ºC. Electrophoresis of the hemoglobin showed the same component in each of the three subspecies. At 20ºC the blood oxygen affinities (P50) showed small differences between Bufo spinulosus limensis and Bufo spinulosus trifolium, whereas the value for Bufo spinulosus flavolineatus was markedly lower. At 10ºC, the ambient temperature of Bufo spinulosus flavolineatus, the P50 was extremely low compared with the other two...
Tipo: Journal article Palavras-chave: Adaptations; Altitude; Amphibians; Bufo spinulosus limensis; Bufo spinulosus trifolium; Bufo spinulosus flavolineatus; Hemoglobin affinity; Hematocrits; Oxygen binding; Toads.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000100007
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