E
edward
Guest
Hi All,
From a recent issue of Herpetologica,
Genetic Variation amoung populations of Eaastern Newts, Notopthalmus viridescens: a preliminary analysis based on allozymes. (Gabor and Nice, 2004, Herpetologica 60(3):373-386)
The interesting point is summed up here in the abstract "We analyzed 18 allozyme loci to examine the evolutionary relationship amoung the four subspecies of eastern newts: N. v. viridescens, N. v. dorsalis, N. v. louisianensis and N. v. piaropicola. Despite moderate amounts of genetic variation, phylogenetic and phenetic analyses of the relationship amoung 12 sites resulted in trees that were inconsistant with the current subspecific classiification. Cluster and phylognetic analyses of allele frequency variation confirmed this, indicating an abscence of significan differentiation between the subspecies. Instead populations of N. viridescens appear to cluster into groups representing geogrtaphic units that do not directly correspond to the currently recognized subspecies. The morphological and life history differences amoung the subspecies are not clearly associated with differentiation at allozyme level. Recent divergence, gene flow, or phenotype plasticity may explain the lack of correlation between genetic and morphological differentiation."
I was slightly dissapointed that they did not include any maps of the analysis compared to the current recognized subspecies. Well it was listed as a prelimiany result so I guess I shouldn't have been too dissapointed.
Ed
From a recent issue of Herpetologica,
Genetic Variation amoung populations of Eaastern Newts, Notopthalmus viridescens: a preliminary analysis based on allozymes. (Gabor and Nice, 2004, Herpetologica 60(3):373-386)
The interesting point is summed up here in the abstract "We analyzed 18 allozyme loci to examine the evolutionary relationship amoung the four subspecies of eastern newts: N. v. viridescens, N. v. dorsalis, N. v. louisianensis and N. v. piaropicola. Despite moderate amounts of genetic variation, phylogenetic and phenetic analyses of the relationship amoung 12 sites resulted in trees that were inconsistant with the current subspecific classiification. Cluster and phylognetic analyses of allele frequency variation confirmed this, indicating an abscence of significan differentiation between the subspecies. Instead populations of N. viridescens appear to cluster into groups representing geogrtaphic units that do not directly correspond to the currently recognized subspecies. The morphological and life history differences amoung the subspecies are not clearly associated with differentiation at allozyme level. Recent divergence, gene flow, or phenotype plasticity may explain the lack of correlation between genetic and morphological differentiation."
I was slightly dissapointed that they did not include any maps of the analysis compared to the current recognized subspecies. Well it was listed as a prelimiany result so I guess I shouldn't have been too dissapointed.
Ed