The taxonomic status of Rhabdolichops troscheli (Kaup, 1856), and speculations on gymnotiform evolution
Identifieur interne : 006381 ( Istex/Curation ); précédent : 006380; suivant : 006382The taxonomic status of Rhabdolichops troscheli (Kaup, 1856), and speculations on gymnotiform evolution
Auteurs : Francisco Mago-Leccia [Venezuela] ; Thomas M. Zaret [États-Unis]Source :
- Environmental Biology of Fishes [ 0378-1909 ] ; 1978-12-01.
Descripteurs français
- Wicri :
- geographic : Venezuela.
English descriptors
- KwdEn :
- Academic press, Branchial arches, Characiform, Characiform ancestors, Cyclopoid copepods, Dorsal view, Ecological studies, Eigenmannia, Eigenmannia virescens, Electric communication, Electric organs, Fish physiology, Food items, Generalized characiforms, Gill rakers, Gymnotiform, Gymnotiform fishes, Gymnotiforms, Large mouth, Light penetration, Morphological characteristics, Nocturnal habits, Prey location, Rhabdolichops, Rhabdolichops troscheli, Stomach contents, Troscheli, Venezuela, Virescens.
- Teeft :
- Academic press, Branchial arches, Characiform, Characiform ancestors, Cyclopoid copepods, Dorsal view, Ecological studies, Eigenmannia, Eigenmannia virescens, Electric communication, Electric organs, Fish physiology, Food items, Generalized characiforms, Gill rakers, Gymnotiform, Gymnotiform fishes, Gymnotiforms, Large mouth, Light penetration, Morphological characteristics, Nocturnal habits, Prey location, Rhabdolichops, Rhabdolichops troscheli, Stomach contents, Troscheli, Venezuela, Virescens.
Abstract
Synopsis: Anatomical and ecological studies of the gymnotiformRhabdolichops troscheli (Kaup 1856), one of the weakly electric fish of South America, indicate it to be unique among gymnotiforms in possessing certain characteristics found in characins. These include post-temporal fossae, well developed gillrakers, a planktivorous feeding mode, and diurnal feeding activity. We use these findings to speculate about the evolution of gymnotiform fishes, by assuming that these character states in this most primitive gymnotiform convey information about the group's evolutionary history. We suggest that the electric organs in this group of ostaryophysans have evolved primarily as a means of locating and capturing prey in river habitats of South America whose turbid waters result in low light penetration, ruling out visual sensing systems as an effective means of receiving information. Other aspects of morphology and behavior such as the absence or reduction of scales, and the nocturnal feeding activities characteristic of other gymnotiform, can be explained as consequences of food resource availability and predation pressures in these riverine environments.
Url:
DOI: 10.1007/BF00000530
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Zaret</name><affiliation wicri:level="1"><mods:affiliation>Department of Zoology FM-12, University of Washington, 98195, Seattle, Washington, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Zoology FM-12, University of Washington, 98195, Seattle, Washington</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:C8A0E44B812CF0CC5E4778C7E80BD5FC634AE7F9</idno><date when="1978" year="1978">1978</date><idno type="doi">10.1007/BF00000530</idno><idno type="url">https://api.istex.fr/document/C8A0E44B812CF0CC5E4778C7E80BD5FC634AE7F9/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">006381</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">006381</idno><idno type="wicri:Area/Istex/Curation">006381</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">The taxonomic status of Rhabdolichops troscheli (Kaup, 1856), and speculations on gymnotiform evolution</title><author><name sortKey="Mago Leccia, Francisco" sort="Mago Leccia, Francisco" uniqKey="Mago Leccia F" first="Francisco" last="Mago-Leccia">Francisco Mago-Leccia</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Zoologia Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela</mods:affiliation><country xml:lang="fr">Venezuela</country><wicri:regionArea>Instituto de Zoologia Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Caracas</wicri:regionArea></affiliation></author><author><name sortKey="Zaret, Thomas M" sort="Zaret, Thomas M" uniqKey="Zaret T" first="Thomas M." last="Zaret">Thomas M. 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These include post-temporal fossae, well developed gillrakers, a planktivorous feeding mode, and diurnal feeding activity. We use these findings to speculate about the evolution of gymnotiform fishes, by assuming that these character states in this most primitive gymnotiform convey information about the group's evolutionary history. We suggest that the electric organs in this group of ostaryophysans have evolved primarily as a means of locating and capturing prey in river habitats of South America whose turbid waters result in low light penetration, ruling out visual sensing systems as an effective means of receiving information. Other aspects of morphology and behavior such as the absence or reduction of scales, and the nocturnal feeding activities characteristic of other gymnotiform, can be explained as consequences of food resource availability and predation pressures in these riverine environments.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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