{"id":776,"date":"2018-11-07T00:09:45","date_gmt":"2018-11-07T03:09:45","guid":{"rendered":"https:\/\/www.ufrgs.br\/ictio\/?p=776"},"modified":"2018-11-07T00:09:45","modified_gmt":"2018-11-07T03:09:45","slug":"evolution-of-trans-andean-endemic-fishes-of-the-genus-cheirodon-teleostei-characidae-are-associated-with-chromosomal-rearrangements","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ictio\/2018\/11\/07\/evolution-of-trans-andean-endemic-fishes-of-the-genus-cheirodon-teleostei-characidae-are-associated-with-chromosomal-rearrangements\/","title":{"rendered":"Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements"},"content":{"rendered":"

Miguel\u00a0\u00c1ngel\u00a0Soto,\u00a0<\/span>Jonathan\u00a0Pena\u00a0Castro,\u00a0<\/span>Laura\u00a0Ines\u00a0Walker,\u00a0<\/span>Luiz\u00a0Roberto\u00a0Malabarba<\/strong>,\u00a0<\/span>Mateus Henrique\u00a0Santos,\u00a0<\/span>Mara\u00a0Cristina\u00a0de Almeida,\u00a0<\/span>Orlando\u00a0Moreira-Filho, and\u00a0<\/span>Roberto\u00a0Ferreira\u00a0Artoni<\/span><\/p>\n

Abstract<\/h2>\n
\n

Background<\/h3>\n

Among Neotropical fishes, the family Characidae is highly diverse and speciose and its taxonomy is not completely resolved. In Chile, the family is represented by five species, all within the genus\u00a0Cheirodon<\/em>, of which\u00a0C. pisciculus, C. galusdae, C. kiliani<\/em>, and\u00a0C. australe<\/em>\u00a0are endemic,<\/em>\u00a0while\u00a0C. interruptus<\/em>\u00a0is introduced. We compared chromosomal markers in order to appreciate the taxonomy and evolution of these trans-Andean fishes.<\/p>\n<\/div>\n

\n

Results<\/h3>\n

The specimens were photographed in stereomicroscope to observe the ventral protrusive teeth and cusps for morphological analysis and species identification. All of the species analysed had equally diploid chromosome number 2n\u2009=\u200950, with karyotypes dominated by high number of acrocentric chromosomes as compared to those of other members of Cheirodontinae. The distribution of heterochromatin was inconspicuous and was similar in all the species. The number of active NORs (nucleolus organizer regions) was polymorphic, with the greater number of them in\u00a0C. kiliani<\/em>\u00a0and\u00a0C. galusdae<\/em>. The location of 5S and 18S rDNA ranged in number and position, showing two sites in different chromosomes. The fluorescent in situ hybridization with telomeric probe did not reveal interstitial sites in all analysed species.<\/p>\n<\/div>\n

\n

Conclusions<\/h3>\n

The comparative analysis of karyotypes and morphological markers revealed a biogeographic pattern of distribution, with the species that occur in the southern region forming one group and those in central and northern Chile forming another.<\/p>\n<\/div>\n

Link:\u00a0https:\/\/link.springer.com\/article\/10.1186\/s40693-018-0078-5<\/a><\/p>\n

\"\"<\/a>

Fig. 4 Geographic regions of Chile (left), ideograms (middle) and photographs of teeth and caudal peduncle region (right) of Cheirodon species occurring in Chile. (a) Ch. interruptus from Estero Marga-Marga; V region, (b) Ch. pisciculus from Angostura River; Metropolitan region, (c) Ch. galusdae from Andali\u00e9n River; VIII region, (d) Ch. kiliani from Calle-Calle River; XIV region and (e) Ch. australe from La Poza Lake; X region, base level Llanquihue Lake. Ideograms show 18S and 5S rDNA gene location. Mid-marks represent rDNA sites that may be present or absent, in the same individual (heteromorphism) or in different individuals (polymorphism). In the photographs of teeth bar: 500 \u03bcm, and in those of peduncle region bar: 2 mm<\/p><\/div>\n

\"\"<\/a>

Fig. 5
Chromosomal phylogenetic hypothesis for five species of Cheirodon in Chile, with two species of genera Odontostilbe and Serrapinus serving as outgroups. The number of pericentric inversions (i) and Robertsonian fusions (f) implied in the clade divergence are included in the nodes<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Miguel\u00a0\u00c1ngel\u00a0Soto,\u00a0Jonathan\u00a0Pena\u00a0Castro,\u00a0Laura\u00a0Ines\u00a0Walker,\u00a0Luiz\u00a0Roberto\u00a0Malabarba,\u00a0Mateus Henrique\u00a0Santos,\u00a0Mara\u00a0Cristina\u00a0de Almeida,\u00a0Orlando\u00a0Moreira-Filho, and\u00a0Roberto\u00a0Ferreira\u00a0Artoni Abstract Background Among Neotropical fishes, the family Characidae is highly diverse and speciose and its taxonomy is not completely resolved. In Chile, the family is represented by five species, all within the genus\u00a0Cheirodon, of which\u00a0C. pisciculus, C. galusdae, C. kiliani, and\u00a0C. australe\u00a0are endemic,\u00a0while\u00a0C. interruptus\u00a0is introduced. We compared chromosomal markers in order […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-776","post","type-post","status-publish","format-standard","hentry","category-sem-categoria"],"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/comments?post=776"}],"version-history":[{"count":1,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/776\/revisions"}],"predecessor-version":[{"id":779,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/776\/revisions\/779"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/media?parent=776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/categories?post=776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/tags?post=776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}