Skip to main content

Morphology and reproduction of the cavefish Trichomycterus chaberti and the related epigean Trichomycterus cf. barbouri

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

Hypogean and epigean populations of Trichomycterus catfishes inhabit streams from different environments (cave, headwater, canyon and valley) in the Torotoro National Park in the Andes, Bolivia. A significant reduction in the diameter of the eyes and in the surface area of the mesencephalon was observed in subterranean populations, along with an increase in the surface area of the telencephalon. Contrary to expectations, the barbel did not appear to be longer in hypogean populations. The observed pattern of modification of the other variables (pigmentation, eye asymmetry, surface area of the cerebellum and rhombencephalon, fecundity and egg diameter) corresponded to a gradient of values from valley to canyon, headwater and subterranean populations. This result argues not for a simple distinction between epigean and hypogean populations but for an adaptation to an environmental gradient of constraints in which caves correspond to an extreme situation.

Keywords: Trichomycterus; brain; cave life; environmental gradient; morphology; reproduction

Document Type: Regular Paper

DOI: https://doi.org/10.1046/j.1095-8649.2003.00171.x

Affiliations: 1: Institut de Recherche pour le Développement (IRD) / Université Lyon 1, Laboratoire d'Ecologie des Hydrosystèmes Fluviaux, Bd du 11 Novembre 1918, F-69622 Villeurbanne Cedex – France and 2: Instituto de Ecología, Universidad Mayor de San Andrés, Bolivia, CP 10077, La Paz – Bolivia

Publication date: 2003-08-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more