Journal Article
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters
Grempel, R.G., Trajano, E. and Visconti, M.A.
Record Number:
4774
Year:
2020
Journal:
Neotropical Ichthyology
Pages:
e190120
Volume:
18
Abstract:
Organisms with source-populations restricted to the subterranean biotope
(troglobites) are excellent models for comparative evolutionary studies, due
to their specialization to permanent absence of light. Eye and dark pigment
regression are characteristics of most troglobites. In spite of the advance in
knowledge on the mechanisms behind eye regression in cave fishes, very little
is known about pigmentation changes. Studies were focused on three species of
the genus Pimelodella. Exemplars of the troglobitic P. spelaea and P. kronei were
compared with the epigean (surface) P. transitoria, putative sister-species of the
latter. Melanophore areas and densities are significantly lower in the troglobitic
species. Evaluating the in vitro response of these cells to adrenaline, acetylcholine
and MCH, we observed a reduced response in both troglobites to adrenaline. The
same trend was observed with MCH, but not statistically significant. No response
to acetilcholine was detected in all the three. Contrary to expectations, even
though eye-regression in P. spelaea was much lower than in P. kronei, pigmentation
regression was more advanced. Multiple mechanisms of loss showing a mosaic of
traits in troglobitic fishes are discussed here.
Keywords: Adrenaline, Melanin Concentrating Hormone, Melanophores,
Physiology of Pigmentation, Troglobitic Fish.
Times Cited:
2
Relevent Species:
Related Records:
Miranda Ribeiro, A. de (1907)
Typhlobagrus kronei
Eigenmann, C. H. (1917)Pimelodella and Typhlobagrus
Leonardos, O. H. (1937)O bagrinho sem olhos das grutas de Iporanga
Pavan, C. (1945)Os Peixeos cegos das cavernas de Iporanga e a evolucao
Pavan, C. (1946)Observations and experiments on the cave fish Pimelodella kronei and its relatives
Strinati, P. (1975)Faune des Grutas das Areias (Sao Paulo, Brasil)
Almeida-Toledo, L. F., Trajano, E., Toledo, F. and Foresti, F. (1985)Analise citogenetica comparativa entre o peixe cego Pimelodella kronei das Grutas de Iporanga (SP) e seu preumivel ancestral, Pimelodella transitoria
Trajano, E. (1986)Population study of Pimelodella kronei (Teleostei, Siluriformes), blind catfish from the Upper Ribeiro river valley, southeastern Brazil
Trajano, E. (1987)Biologia do cavernicola, Pimelodella kronei e de seu provavel ancestral, Pimelodella transitoria (Siluriformes, Pimelodidae)
Britski, H. A. and Trajano, E. (1987)Caecorhamdella brasiliensis Borodin, 1927, um sinonimo de Pimelodella kronei (Ribeiro, 1907) (Siluriformes, Teleostomi)
Trajano, E. (1989)Spontaneous and feeding behaviour and diet of the blind catfish, Pimelodella kronei and its putative ancestor, Pimelodella transitoria, from southeastern Brazil (Siluriformes, Pimelodidae)
Trajano, E. (1989)Preliminary study of the chemical communication in the troglobite catfish Pimelodella kronei (Ribeiro, 1907) from southeastern Brazil (Siluriformes, Pimelodidae)
Trajano, E. (1989)Estudo do comportamento espontaneo e alimentar e da dieta do bagre cavernicola, Pimelodella kronei, e seu provavel ancestral epigeo, Pimelodella transitoria (Siluriformes, Pimelodidae)
Trajano, E. (1991)Population ecology of Pimelodella kronei, troglobitic catfish from southeastern Brazil (Siluriformes, Pimelodidae)
Trajano, E. (1991)The agonistic behaviour of Pimelodella kronei, a troglobitic catfish from southeastern Bazil (Siluriformes, Pimelodidae)
Almeida-Toledo, L.F., Foresti, F., Trajano, E. and Almeida-Toledo, S. (1992)Cytogenetic analysis of the Brazilian blind catfish Pimelodella kronei and its presumed ancestor P. transitoria
Trajano, E. (1993)Considerations about systematics and the evolution of behavior in Siluriform cave fishes
Trajano, E. and Britski, H. A. (1993)Pimelodella kronei (Ribeiro, 1907) e seu sinonimo Caecorhamdella brasiliensis Borodin, 1927: Morfologia externa, taxonomia, e evolucao (Teleostomi, Siluriformes)
Trajano, E. (1994)Comparative study of the brain and olfactory organ of the troglobitic catfish Pimelodella kronei (Ribeiro, 1907) and its putative ancestor P. transitoria (Ribeiro, 1912) (Siluriformes, Pimelodidae)
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Dazzani, B., Garcia, C., Peixoto, M., Trajano, E. and de Almeida-Toledo, L.F. (2012)Cytogenetic and molecular analyses in troglobitic and epigean species of Pimelodella (Siluriformes: Heptapteridae) from Brazil
Dazzani, B., Garcia, C., Peixoto, M., Trajano, E. and de Almeida-Toledo, L.F. (2012)Cytogenetic and molecular analyses in troglobitic and epigean species of Pimelodella (Siluriformes: Heptapteridae) from Brazil
Trajano, E., Ueno, J.C.H. and Menna-Barreto, L. (2012)Evolution of time-control mechanisms in subterranean organisms: cave fishes under light-dark cycles (Teleostei: Siluriformes, Characiformes)
Guil, A.L.F. and Trajano, E. (2013)Dinâmica populacional do bagre cego de Iporanga, Pimelodella kronei: 70 anos de estudo
Trajano, E., Gallao, J.E. and Bichuette, M.E. (2016)Spots of high biodiversity of troglobites in Brazil: the challenge of measuring subterranean diversity
Trajano, E., Gallao, J.E. and Bichuette, M.E. (2016)Spots of high biodiversity of troglobites in Brazil: the challenge of measuring subterranean diversity
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Slobodian, V. (2017)Taxonomic revision of Pimelodella Eigenmann and Eigenmann 1888 (Silutiformes, Heptapteridae): An integrative proposal to delimit species using a multidisciplinary strategy
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Gallão, J.E. and Bichuette M.E. (2018)Brazilian obligatory subterranean fauna and threats to the hypogean environment
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Slobodian, V. and Pastana, M.N.L. (2018)Description of a new Pimelodella (Siluriformes: Heptapteridae) species with a discussion on the upper pectoral girdle homology of Siluriformes
Bichuette, M.E., Simões, L.B., Zepon, T., von Schimonsky, D.M. and Gallão, J.E. (2019)Richness and taxonomic distinctness of cave invertebrates from the northeastern state of Goiás, central Brazil: a vulnerable and singular area
Fernandes, C.S., Batalha, M.A., Bichuette, M.E. (2019)Dark diversity in the dark: a new approach to subterranean conservation
Grempel, R.G., Trajano, E. and Visconti, M.A. (2020)Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters
Grempel, R.G., Trajano, E. and Visconti, M.A. (2020)Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters
Bonato, L. and Ferreira. R.L. (2023)Assessing troglomorphic and phylogenetically informative traits in troglobionts: a new cave‑dwelling centipede illuminates the evolution of a soil‑dwelling lineage (Chilopoda: Geophilidae)