9 results match your criteria troglomorphic adaptations

  • Page 1 of 1

The subterranean catfish provides insights into visual adaptations to the phreatic environment.

Int J Dev Biol 2021 ;65(4-5-6):245-250

Instituto de Ciências Biológicas, Universidade Federal do Pará (UFPA), Belém, Pará, Brazil.

Vertebrate eyes share the same general organization, though species have evolved morphological and functional adaptations to diverse environments. Cave-adapted animals are characterized by a variety of features including eye reduction, loss of body pigmentation, and enhanced non-visual sensory systems. Species that live in perpetual darkness have also evolved sensory mechanisms that are independent of light stimuli. Read More

View Article and Full-Text PDF
January 2021

Systemic paralogy and function of retinal determination network homologs in arachnids.

BMC Genomics 2020 Nov 23;21(1):811. Epub 2020 Nov 23.

Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, 53706, USA.

Background: Arachnids are important components of cave ecosystems and display many examples of troglomorphisms, such as blindness, depigmentation, and elongate appendages. Little is known about how the eyes of arachnids are specified genetically, let alone the mechanisms for eye reduction and loss in troglomorphic arachnids. Additionally, duplication of Retinal Determination Gene Network (RDGN) homologs in spiders has convoluted functional inferences extrapolated from single-copy homologs in pancrustacean models. Read More

View Article and Full-Text PDF
November 2020

Subterranean life: Behavior, metabolic, and some other adaptations of Astyanax cavefish.

J Exp Zool B Mol Dev Evol 2020 11 28;334(7-8):463-473. Epub 2020 Apr 28.

Laboratorio de Neurobiología Molecular y Celular, Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Santiago de Querétaro, México.

The ability of fishes to adapt to any aquatic environment seems limitless. It is enthralling how new species keep appearing at the deep sea or in subterranean environments. There are close to 230 known species of cavefishes, still today the best-known cavefish is Astyanax mexicanus, a Characid that has become a model organism, and has been studied and scrutinized since 1936. Read More

View Article and Full-Text PDF
November 2020

Ecophysiological and life-history adaptations of Gammarus balcanicus (Schäferna, 1922) in a sinking-cave stream from Western Carpathians (Romania).

Zoology (Jena) 2020 04 30;139:125754. Epub 2020 Jan 30.

Department of Biology-Chemistry, Faculty of Chemistry, Biology, Geography, West University of Timișoara, 16A Pestalozzi Street, 300115, Timișoara, Romania.

Freshwater gammarids are known to colonise occasionally sinking-cave streams, providing contrasting morphological, life-history and ecophysiological adaptations compared to their surface conspecifics. In this study, a subterranean and a surface population of the species Gammarus balcanicus was surveyed for one year in a sinking-cave stream from the Western Carpathians (Romania). The results showed that the cave-dwelling population comprised individuals that were significantly larger compared to their surface conspecifics, had larger body-size at sexual maturity and that the females produced fewer, but larger eggs, compared to the population situated outside the cave. Read More

View Article and Full-Text PDF

On the use of troglomorphic characters in Namanereidinae (Annelida; Nereididae) systematics.

Zootaxa 2018 Dec 12;4531(2):195-210. Epub 2018 Dec 12.

Programa de Pós-Graduação em Biologia Marinha e Ambientes Costeiros, Universidade Federal Fluminense, Departamento de Biologia Marinha, Niterói, Rio de Janeiro, Brasil;.

The Namanereidinae are one of the most successful polychaete groups to colonize subterranean waters. Many species have evolved adaptations to underground life including elongation of appendages and reduction of eyes and pigmentation. However, the use of these troglomorphic characters in the group's systematics is contentious. Read More

View Article and Full-Text PDF
December 2018

Three new species of the spider genus and the new genus from caves of the states of Pará and Minas Gerais, Brazil (Araneae, Theridiosomatidae).

Zookeys 2018 27(753):107-162. Epub 2018 Apr 27.

Laboratório Especial de Coleções Zoológicas, Instituto Butantan. Av. Vital Brazil, 1500, CEP 05503-900, São Paulo, SP, Brazil.

Three new species of the genus from caves in the states of Pará and Minas Gerais, Brazil, are described. , from Minas Gerais, is the first record of the genus in the southeastern region of Brazil. and , from Carajás, Pará, north of Brazil, are also described. Read More

View Article and Full-Text PDF

The role of isolation on contrasting phylogeographic patterns in two cave crustaceans.

BMC Evol Biol 2017 12 7;17(1):247. Epub 2017 Dec 7.

Department of Biological Sciences, Florida International University - Biscayne Bay Campus, 3000 NE 151 St., North Miami, FL, 33181, USA.

Background: The underlying mechanisms and processes that prompt the colonisation of extreme environments, such as caves, constitute major research themes of evolutionary biology and biospeleology. The special adaptations required to survive in subterranean environments (low food availability, hypoxic waters, permanent darkness), and the geographical isolation of caves, nominate cave biodiversity as ideal subjects to answer long-standing questions concerning the interplay amongst adaptation, biogeography, and evolution. The present project aims to examine the phylogeographic patterns exhibited by two sympatric species of surface and cave-dwelling peracarid crustaceans (Asellus aquaticus and Niphargus hrabei), and in doing so elucidate the possible roles of isolation and exaptation in the colonisation and successful adaptation to the cave environment. Read More

View Article and Full-Text PDF
December 2017

Monitoring health and reproductive status of olms (Proteus anguinus) by ultrasound.

PLoS One 2017 15;12(8):e0182209. Epub 2017 Aug 15.

Department of Reproduction Management, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany.

The olm (Proteus anguinus) is a troglomorphic, neotenous amphibian with extraordinary life expectancy and unique adaptations that deserve further investigation. A low reproductive rate and habitat decline render it threatened by extinction. Establishing captive populations for maintenance and artificial breeding may one day become crucial to the species. Read More

View Article and Full-Text PDF
October 2017

Comparative ocular anatomy in a blind African cichlid fish, Lamprologus lethops.

Vet Ophthalmol 2013 Sep 27;16(5):359-64. Epub 2012 Nov 27.

Comparative Ocular Pathology Laboratory of Wisconsin, School of Veterinary Medicine, University of Wisconsin-Madison, WI, 53706, USA.

Objective: Troglomorphic fishes provide excellent comparative models for studying eye evolution. We describe the gross and microscopic anatomy of ocular structures of the depigmented, blind cichlid, Lamprologus lethops, and its putative sister species, Lamprologus tigripictilis collected from the lower Congo River in the Democratic Republic of Congo.

Procedures: Both species were fixed, paraffin-sectioned and stained. Read More

View Article and Full-Text PDF
September 2013
  • Page 1 of 1