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

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The 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.

RBID : ISTEX:C8A0E44B812CF0CC5E4778C7E80BD5FC634AE7F9

Descripteurs français

Wicri :
- geographic : Venezuela.

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:

https://api.istex.fr/document/C8A0E44B812CF0CC5E4778C7E80BD5FC634AE7F9/fulltext/pdf

DOI: 10.1007/BF00000530

Affiliations:

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Le document en format XML

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<term>Dorsal view</term>
<term>Ecological studies</term>
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<term>Morphological characteristics</term>
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<front><div type="abstract" xml: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.</div>
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<country name="États-Unis"><region name="Washington (État)"><name sortKey="Zaret, Thomas M" sort="Zaret, Thomas M" uniqKey="Zaret T" first="Thomas M." last="Zaret">Thomas M. Zaret</name>
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The taxonomic status of Rhabdolichops troscheli (Kaup, 1856), and speculations on gymnotiform evolution

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

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri