Open AccessChromosomal studies on C oscoroba coscoroba ( A ves: A nseriformes) reinforce the C oscoroba– C ereopsis clade
Author(s) -
Rodrigues Benilson S.,
Assis Maria De Fatima L.,
O'Brien Patricia C. M.,
FergusonSmith Malcolm A.,
Oliveira Edivaldo H. C.
Publication year - 2014
Publication title -
biological journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.906
H-Index - 112
eISSN - 1095-8312
pISSN - 0024-4066
DOI - 10.1111/bij.12202
Subject(s) - biology , anseriformes , ploidy , phylogenetic tree , clade , microchromosome , goose , zoology , anatidae , sister group , karyotype , panama , evolutionary biology , chromosome , genetics , ecology , gene
The C oscoroba ( C oscoroba coscoroba ), endemic to southern S outh A merica, is traditionally considered as an early branch from the common ancestor leading to true geese and swans. Recently, an interesting association between the C oscoroba and C ape B arren goose ( C ereopsis novaehollandiae ) as sister groups has been proposed. We present here the characterization of the karyotype of C . coscoroba using whole chromosome probes derived from G allus gallus macrochromosomes. Our data showed that C . coscoroba has the highest diploid number among A nseriformes (2 n = 98), and the conservation of macrochromosome pairs 1–10 indicates that the increase in diploid number has occurred by fission events involving only the microchromosomes. Moreover, the similarity between the diploid numbers of C . coscoroba (2 n = 98) and C ereopsis novaehollandiae (2 n = 92) reinforces the phylogenetic position of these two species as sister groups, considering that other species of geese and swans have diploid numbers close to 2 n = 80. © 2013 The Linnean Society of London, Biological Journal of the Linnean Society , 2014, 111 , 274–279.