Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements

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 Cheirodon , of which C. pisciculus, C. galusdae, C. kiliani , and C. australe ar...

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Autores principales:	Soto,Miguel Ángel, Pena Castro,Jonathan, Walker,Laura Ines, Malabarba,Luiz Roberto, Santos,Mateus Henrique, Almeida,Mara Cristina de, Moreira Filho,Orlando, Artoni,Roberto Ferreira
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2018
Materias:	Andean cordillera Endemism Freshwater fishes Chromosome Sea level South America
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2018000100208
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spelling	oai:scielo:S0716-078X20180001002082018-08-20Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangementsSoto,Miguel ÁngelPena Castro,JonathanWalker,Laura InesMalabarba,Luiz RobertoSantos,Mateus HenriqueAlmeida,Mara Cristina deMoreira Filho,OrlandoArtoni,Roberto Ferreira Andean cordillera Endemism Freshwater fishes Chromosome Sea level South America 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 Cheirodon , of which C. pisciculus, C. galusdae, C. kiliani , and C. australe are endemic , while C. interruptus is introduced. We compared chromosomal markers in order to appreciate the taxonomy and evolution of these trans-Andean fishes. Results 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 = 50, 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 C. kiliani and C. galusdae . 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. Conclusions 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.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.91 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2018000100208en10.1186/s40693-018-0078-5
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Andean cordillera Endemism Freshwater fishes Chromosome Sea level South America
spellingShingle	Andean cordillera Endemism Freshwater fishes Chromosome Sea level South America Soto,Miguel Ángel Pena Castro,Jonathan Walker,Laura Ines Malabarba,Luiz Roberto Santos,Mateus Henrique Almeida,Mara Cristina de Moreira Filho,Orlando Artoni,Roberto Ferreira Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements
description	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 Cheirodon , of which C. pisciculus, C. galusdae, C. kiliani , and C. australe are endemic , while C. interruptus is introduced. We compared chromosomal markers in order to appreciate the taxonomy and evolution of these trans-Andean fishes. Results 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 = 50, 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 C. kiliani and C. galusdae . 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. Conclusions 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.
author	Soto,Miguel Ángel Pena Castro,Jonathan Walker,Laura Ines Malabarba,Luiz Roberto Santos,Mateus Henrique Almeida,Mara Cristina de Moreira Filho,Orlando Artoni,Roberto Ferreira
author_facet	Soto,Miguel Ángel Pena Castro,Jonathan Walker,Laura Ines Malabarba,Luiz Roberto Santos,Mateus Henrique Almeida,Mara Cristina de Moreira Filho,Orlando Artoni,Roberto Ferreira
author_sort	Soto,Miguel Ángel
title	Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements
title_short	Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements
title_full	Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements
title_fullStr	Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements
title_full_unstemmed	Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements
title_sort	evolution of trans-andean endemic fishes of the genus cheirodon (teleostei: characidae) are associated with chromosomal rearrangements
publisher	Sociedad de Biología de Chile
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2018000100208
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Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements

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