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
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
Britski, H. A. and Trajano, E. (1987)
Caecorhamdella brasiliensis Borodin, 1927, um sinonimo de Pimelodella kronei (Ribeiro, 1907) (Siluriformes, Teleostomi)
Trajano, E. (1987)
Biologia do cavernicola, Pimelodella kronei e de seu provavel ancestral, Pimelodella transitoria (Siluriformes, Pimelodidae)
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)
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Almeida-Toledo, L.F., Foresti, F., Trajano, E. and Almeida-Toledo, S. (1992)
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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