Chromosomal population structuring in carangids (Perciformes) between the north-eastern and south-eastern coasts of Brazil

Physical mapping of 18S and 5S genes in pelagic species of the genera Caranx and Carangoides (Carangidae)

“…In this respect, the frequent occurrence of equilocal heterochromatin in the nuclear organizer regions (CG+) reinforces the hypothesis that repetitive DNA favors the occurrence and retention of chromosomal rearrangements (Redi et al, 1990;Fujiwara et al, 1998;Jacobina et al, 2012a,b;Accioly et al, 2012). In fact, C. lugubris that are GC-rich in most chromosomes show the most cytogenetic differences among the 3 species.…”

“…(2014) rDNA genes in the chromosomes of Caranx and Carangoides spp Pericentric inversions are one of the primary mechanisms responsible for karyotypic diversification in carangids (Caputo et al, 1996;Sola et al, 1997;Rodrigues et al, 2007;Chai et al, 2009). In some genera, such as Trachinotus (NF = 52-58) and Trachurus (NF = 50-66), pericentric inversions have played an important role in the karyotype diversification (Murofushi and Yoshida, 1979;Caputo et al, 1996;Rodrigues et al, 2007, Jacobina et al, 2012aAccioly et al, 2012). Moreover, other sporadic mechanisms may have contributed to the chromosomal evolution of this group, particularly Robertsonian translocations, which are found in Trachurus, Seriola, and Selene (Vitturi et al, 1986;Jacobina et al, 2012b).…”

“…In groups of fish with conserved chromosomal characteristics, the mapping of 18 and 5S sequences using dual-color FISH, as used for C. bartholomei, C. latus, and C. lugubris allows analysis of karyotype evolution, rearrangements involved in diversification, and discrimination of species or populations (Accioly et al, 2012;Jacobina et al, 2013). The presence of 18S rDNA sites on the same homeolog pair (pair 1) and 5S rDNA sites located at the same position (short arm) of pair 15 in C. bartholomei and C. latus reinforce the conservation and phylogenetic proximity among the species in these 2 genera (Carangoides and Caranx), which are considered by some authors to belong to the same genus (Smith-Vaniz, 1984;Reed et al, 2002).…”

“…Cytogenetic data are important for identifying evolutionary significant units (Moritz et al, 1996) and have been employed in recent surveys for diverse groups of Carangidae (Accioly et al, 2012;Jacobina et al, 2012aJacobina et al, ,b, 2013. The genetic and ecological peculiarities of the family make this group of marine fish an important model for evolutionary studies.…”

Chromosomal distribution of two multigene families and the unusual occurrence of an X1X1X2X2/X1X2Y sex chromosome system in the dolphinfish (Coryphaenidae): An evolutionary perspective

“…Among marine Perciformes, the suborder Carangoidei, which is part of the small family Coryphaenidae (Springer and Smith-Vaniz, 2008), has revealed significant diploid conservatism, where most of the species display 2n = 48 chromosomes (Arai, 2011;Accioly et al, 2012). Coryphaenidae is composed of just 2 epipelagic species: Coryphaena hippurus Linnaeus, 1758 (Common dolphinfish) and Coryphaena equiselis Linnaeus, 1758 (Pompano dolphinfish).…”