Chromosomal studies of five species of the marine fishes from the Paranaguá Bay and the karyotypic diversity in the marine teleostei of the Brazilian coast

Abstract

In this study, five species of marine fishes from the Paranaguá Bay in the Brazilian coast were evaluated. Eucinostomus argenteus and Diapterus rhombeus (Gerreidae) presented 48 chromosomes, all of which more acrocentric (FN = 48); Strongylura timucu and S. marina (Belonidae) also presented 48 chromosomes, but with a higher karyotypic complexity than the Gerreidae, 10M+2SM+36A (FN = 60) and 4M+44A (FN = 52), respectively. The fifth species, Mugil curema (Mugilidae), different than the others, presented only 28 chromosomes 20M+4ST+4A (FN = 48). The species presented diversity in the karyotypic macro-structure, which should be relevant for the cytotaxonomy and the evolution of this group of the vertebrate.<br>Nas últimas décadas tem ocorrido no Brasil um incremento de estudos cariotípicos em peixes marinhos. Atualmente são conhecidos os cariótipos de 118 espécies, distribuídas em 43 famílias e 80 gêneros. Foram estudadas cinco espécies de peixes marinhos do complexo estuarino da Baía de Paranaguá na costa brasileira. Eucinostomus argenteus e Diapterus rhombeus (Gerreidae), apresentaram 48 cromossomos todos acrocêntricos (NF = 48); Strongylura timucu e S. marina (Belonidae) apresentaram 48 cromossomos, porém com complexidade cariotípica maior do que apresentada pelos gerreídeos, 10M+2SM+36A (NF = 60) e 4M+44A (NF = 52), respectivamente. A quinta espécie, Mugil curema (Mugilidae), ao contrário das outras quatro espécies aqui analisadas, apresentou apenas 28 cromossomos 20M+4ST+4A (NF = 48). Apesar da tendência em se verificar um cariótipo constituído por 48 cromossomos em teleósteos marinhos, as espécies aqui analisadas apresentam uma diversidade para a macroestrutura cariotípica a ser considerada para a citotaxonomia e evolução desse grupo de vertebrados

Chromosomal and morphological divergences in Atlantic populations of the frillfin goby Bathygobius soporator (Gobiidae, Perciformes)

“…Previous chromosomal data for B. soporator populations from the coast of Paraná and Rio de Janeiro in south/southeast Brazil, show karyotypes in both locations with 2m + 46a (2n = 48; FN=50) (Cipriano et al, 2008). It is possible that different chromosomal formulas for BA, RN and MA populations evaluated here are due as much to methodological difficulties as exact classification of subtelocentric chromosomes, given the higher degree of condensation or sample size.…”

“…Marine teleosts generally exhibit little variability in the number of chromosomes and substantial uniformity in karyotype macrostructure (Cipriano et al, 2008). However, some groups, such as the family Gobiidae, have very diverse karyotypes (Caputo, 1998;Ene, 2003;Galvão et al, 2011) and an apparent relationship between chromosomal rearrangements and the speciation process.…”

“…Genus Bathygobius contains 28 species (Eschmeyer, 2011), of which only three have cytogenetic descriptions: B. soporator from the Brazilian coast (Cipriano et al, 2008;Galvão et al, 2011), B. fuscus (Arai and Sawada, 1975), and B. stellatus (Vasil'ev, 1985). The diploid number 2n = 48 chromosomes is considered basal for Perciformes (Galetti et al, 2000).…”

Karyotype Divergence and Spreading of 5S rDNA Sequences between Genomes of Two Species: Darter and Emerald Gobies (<b><i>Ctenogobius</i></b>, Gobiidae)

“…The Brazilian region comprises 40 recognized species of Gobiidae [Menezes et al, 2003], with cytogenetic data known only for Bathygobius soporator [Cipriano et al, 2008;Galvão et al, 2011;Lima-Filho et al, 2012]. It is likely that the real number of species in this family is still underestimated mostly due to species diversity, cryptic taxonomic features and gaps of species inventory in the large ranges of the Brazilian coast.…”

Comparative cytogenetic analysis of marine needlefishes (Beloniformes) from southern Brazil

“…The karyotypes of the species in this study were previously described by Cipriano et al (2008) using conventional staining. Both species presented the usual diploid number of 48 chromosomes.…”