Low Genetic Diversity in Diplomystes camposensis, an endemic and endangered catfish from South Chile

Carlos Munoz-Ramirez, Evelyn Habit, Peter UNMACK, Jerald Johnson, Pedro Victoriano

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    Abstract

    Despite the fundamental importance of the family Diplomystidae for understanding catfish evolution, its species are poorly known and most of them endangered. Diplomystes camposensis, restricted to a single river basin in southern Chile, is perhaps the mostvulnerable species due to its small geographic range and imminent habitat alterations by dam constructions.Using mitochondrial DNA sequences, we describe the genetic diversity across its entire distribution in the Valdivia basin and test hypotheses related to the impact of glacial cycles on the genetic diversity andstructure. We found that Diplomystes camposensis has low genetic diversity and structure across the entire Valdivia basin along with a pattern of decreasing nucleotide and haplotype diversity from West to East. Demographic analyses showed evidence of population expansion in agreement with the glaciated history of the basin. Analyses of population structure showed no evidence of population subdivision. However, coalescent analyses indicated that very recent subdivision (in the last 50 years) cannot be ruled out. Low genetic diversity and genetic structure across the entire basin suggest that the species might be highly vulnerable to habitat fragmentation. Thus, the imminent construction of hydropower dams represents a serious threat to its conservation. Our results suggest that the low genetic diversity can be the product of the glaciated history of the basin, although the influence of species-specific biological traits may also add to this condition. Despite the overall low genetic diversity, higher diversity was found in the central portion of the basin suggesting high priority of conservation for this area as it might be used as a source population in case translocations are required among potential management plans.
    Original languageEnglish
    Pages (from-to)1-28
    Number of pages28
    JournalZoological Studies
    Volume55
    Issue number16
    DOIs
    Publication statusPublished - 2016

    Fingerprint

    catfish
    Chile
    basins
    genetic variation
    dams (mothers)
    history
    water power
    founder effect
    habitat fragmentation
    Diplomystes
    haplotypes
    conservation areas
    population structure
    mitochondrial DNA
    demographic statistics
    nucleotides
    nucleotide sequences
    habitats
    testing

    Cite this

    Munoz-Ramirez, Carlos ; Habit, Evelyn ; UNMACK, Peter ; Johnson, Jerald ; Victoriano, Pedro. / Low Genetic Diversity in Diplomystes camposensis, an endemic and endangered catfish from South Chile. In: Zoological Studies. 2016 ; Vol. 55, No. 16. pp. 1-28.
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    Low Genetic Diversity in Diplomystes camposensis, an endemic and endangered catfish from South Chile. / Munoz-Ramirez, Carlos; Habit, Evelyn; UNMACK, Peter; Johnson, Jerald; Victoriano, Pedro.

    In: Zoological Studies, Vol. 55, No. 16, 2016, p. 1-28.

    Research output: Contribution to journalArticle

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    AU - Munoz-Ramirez, Carlos

    AU - Habit, Evelyn

    AU - UNMACK, Peter

    AU - Johnson, Jerald

    AU - Victoriano, Pedro

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    N2 - Despite the fundamental importance of the family Diplomystidae for understanding catfish evolution, its species are poorly known and most of them endangered. Diplomystes camposensis, restricted to a single river basin in southern Chile, is perhaps the mostvulnerable species due to its small geographic range and imminent habitat alterations by dam constructions.Using mitochondrial DNA sequences, we describe the genetic diversity across its entire distribution in the Valdivia basin and test hypotheses related to the impact of glacial cycles on the genetic diversity andstructure. We found that Diplomystes camposensis has low genetic diversity and structure across the entire Valdivia basin along with a pattern of decreasing nucleotide and haplotype diversity from West to East. Demographic analyses showed evidence of population expansion in agreement with the glaciated history of the basin. Analyses of population structure showed no evidence of population subdivision. However, coalescent analyses indicated that very recent subdivision (in the last 50 years) cannot be ruled out. Low genetic diversity and genetic structure across the entire basin suggest that the species might be highly vulnerable to habitat fragmentation. Thus, the imminent construction of hydropower dams represents a serious threat to its conservation. Our results suggest that the low genetic diversity can be the product of the glaciated history of the basin, although the influence of species-specific biological traits may also add to this condition. Despite the overall low genetic diversity, higher diversity was found in the central portion of the basin suggesting high priority of conservation for this area as it might be used as a source population in case translocations are required among potential management plans.

    AB - Despite the fundamental importance of the family Diplomystidae for understanding catfish evolution, its species are poorly known and most of them endangered. Diplomystes camposensis, restricted to a single river basin in southern Chile, is perhaps the mostvulnerable species due to its small geographic range and imminent habitat alterations by dam constructions.Using mitochondrial DNA sequences, we describe the genetic diversity across its entire distribution in the Valdivia basin and test hypotheses related to the impact of glacial cycles on the genetic diversity andstructure. We found that Diplomystes camposensis has low genetic diversity and structure across the entire Valdivia basin along with a pattern of decreasing nucleotide and haplotype diversity from West to East. Demographic analyses showed evidence of population expansion in agreement with the glaciated history of the basin. Analyses of population structure showed no evidence of population subdivision. However, coalescent analyses indicated that very recent subdivision (in the last 50 years) cannot be ruled out. Low genetic diversity and genetic structure across the entire basin suggest that the species might be highly vulnerable to habitat fragmentation. Thus, the imminent construction of hydropower dams represents a serious threat to its conservation. Our results suggest that the low genetic diversity can be the product of the glaciated history of the basin, although the influence of species-specific biological traits may also add to this condition. Despite the overall low genetic diversity, higher diversity was found in the central portion of the basin suggesting high priority of conservation for this area as it might be used as a source population in case translocations are required among potential management plans.

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