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The taxonomic status of Rhabdolichops troscheli (Kaup, 1856), and speculations on gymnotiform evolution

Identifieur interne : 006381 ( Istex/Corpus ); précédent : 006380; suivant : 006382

The taxonomic status of Rhabdolichops troscheli (Kaup, 1856), and speculations on gymnotiform evolution

Auteurs : Francisco Mago-Leccia ; Thomas M. Zaret

Source :

RBID : ISTEX:C8A0E44B812CF0CC5E4778C7E80BD5FC634AE7F9

English descriptors

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

Links to Exploration step

ISTEX:C8A0E44B812CF0CC5E4778C7E80BD5FC634AE7F9

Le document en format XML

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<ArticleTitle Language="En">The taxonomic status of
<Emphasis Type="Italic">Rhabdolichops troscheli</Emphasis>
(Kaup, 1856), and speculations on gymnotiform evolution</ArticleTitle>
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<Para>Anatomical and ecological studies of the gymnotiform
<Emphasis Type="Italic">Rhabdolichops troscheli</Emphasis>
(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.</Para>
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<Heading>Keywords</Heading>
<Keyword>Gymnotids</Keyword>
<Keyword>Fish taxonomy</Keyword>
<Keyword>Tropical fishes</Keyword>
<Keyword>Planktivore</Keyword>
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<abstract lang="en">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.</abstract>
<note>Note</note>
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<titleInfo>
<title>Environmental Biology of Fishes</title>
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<title>Environ Biol Fish</title>
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<topic>Hydrobiology</topic>
<topic>Zoology</topic>
<topic>Animal Systematics/Taxonomy/Biogeography</topic>
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<topic>Nature Conservation</topic>
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