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Evolution of the Juan Fernández diving beetle, Rhantus selkirki (Coleoptera, Dytiscidae).

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Titel: Evolution of the Juan Fernández diving beetle, Rhantus selkirki (Coleoptera, Dytiscidae).
Autoren: Michat, Mariano C., Balke, Michael
Quelle: Zoologica Scripta; Mar2018, Vol. 47 Issue 2, p187-196, 10p
Schlagwörter: BEETLES, BIOLOGICAL evolution, PHYLOGENY, NUCLEOTIDE sequencing
Geografische Kategorien: ROBINSON Crusoe Island (Juan Fernandez Islands)
Abstract: Here we provide evidence that confinement in Robinson Crusoe Island (located about 660 km west of continental Chile) over evolutionary time leads to strong morphological modifications in diving beetle (Dytiscidae) larvae. We analysed a large set of morphological larval characters for all currently recognised genera of Colymbetinae as a framework, to infer phylogenetic relationships within the large genus Rhantus Dejean, 1833 and, in particular, of the charismatic Juan Fernández diving beetle, Rhantus selkirki Jäch, Balke & Michat, 2015, comparing our results with a recent phylogeny of the Colymbetinae based on DNA sequence data. We suggest that adaptation to the island's particular habitats resulted in the reversal of certain characters of R. selkirki back to the plesiomorphic states. This may cause the species to be erroneously interpreted as more ‘primitive’ if only morphological characters are analysed. Confinement in the particular, shallow and barely vegetated aquatic habitats of Robinson Crusoe Island for a long time seems to have led to this divergent morphology, particularly in characters related to swimming ability such as several leg and urogomphal setae. In this way, R. selkirki larvae secondarily resemble those of some earlier diverging dytiscid lineages such as Agabinae and Copelatinae, which typically creep on the bottom of water bodies and do not swim well. [ABSTRACT FROM AUTHOR]
Copyright of Zoologica Scripta is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Evolution of the Juan Fernández diving beetle, <italic>Rhantus selkirki</italic> (Coleoptera, Dytiscidae).
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  Data: <searchLink fieldCode="AR" term="%22Michat%2C+Mariano+C%2E%22">Michat, Mariano C.</searchLink><br /><searchLink fieldCode="AR" term="%22Balke%2C+Michael%22">Balke, Michael</searchLink>
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  Data: Zoologica Scripta; Mar2018, Vol. 47 Issue 2, p187-196, 10p
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  Data: <searchLink fieldCode="DE" term="%22BEETLES%22">BEETLES</searchLink><br /><searchLink fieldCode="DE" term="%22BIOLOGICAL+evolution%22">BIOLOGICAL evolution</searchLink><br /><searchLink fieldCode="DE" term="%22PHYLOGENY%22">PHYLOGENY</searchLink><br /><searchLink fieldCode="DE" term="%22NUCLEOTIDE+sequencing%22">NUCLEOTIDE sequencing</searchLink>
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Here we provide evidence that confinement in Robinson Crusoe Island (located about 660 km west of continental Chile) over evolutionary time leads to strong morphological modifications in diving beetle (Dytiscidae) larvae. We analysed a large set of morphological larval characters for all currently recognised genera of Colymbetinae as a framework, to infer phylogenetic relationships within the large genus <italic>Rhantus</italic> Dejean, 1833 and, in particular, of the charismatic Juan Fernández diving beetle, <italic>Rhantus selkirki</italic> Jäch, Balke & Michat, 2015, comparing our results with a recent phylogeny of the Colymbetinae based on DNA sequence data. We suggest that adaptation to the island's particular habitats resulted in the reversal of certain characters of <italic>R. selkirki</italic> back to the plesiomorphic states. This may cause the species to be erroneously interpreted as more ‘primitive’ if only morphological characters are analysed. Confinement in the particular, shallow and barely vegetated aquatic habitats of Robinson Crusoe Island for a long time seems to have led to this divergent morphology, particularly in characters related to swimming ability such as several leg and urogomphal setae. In this way, <italic>R. selkirki</italic> larvae secondarily resemble those of some earlier diverging dytiscid lineages such as Agabinae and Copelatinae, which typically creep on the bottom of water bodies and do not swim well. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Zoologica Scripta is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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              Text: Mar2018
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