Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters
Autor(a) principal: | |
---|---|
Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Neotropical ichthyology (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200214 |
Resumo: | 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. |
id |
SBI-1_b1d3d8a8aa828042498977b4f89e7f37 |
---|---|
oai_identifier_str |
oai:scielo:S1679-62252020000200214 |
network_acronym_str |
SBI-1 |
network_name_str |
Neotropical ichthyology (Online) |
repository_id_str |
|
spelling |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmittersAdrenalineMelanin Concentrating HormoneMelanophoresPhysiology of PigmentationTroglobitic FishABSTRACT 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.Sociedade Brasileira de Ictiologia2020-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200214Neotropical Ichthyology v.18 n.2 2020reponame:Neotropical ichthyology (Online)instname:Sociedade Brasileira de Ictiologia (SBI)instacron:SBI10.1590/1982-0224-2019-0120info:eu-repo/semantics/openAccessGrempel,Renato GrottaTrajano,EleonoraVisconti,Maria Aparecidaeng2020-07-02T00:00:00Zoai:scielo:S1679-62252020000200214Revistahttp://www.ufrgs.br/ni/https://old.scielo.br/oai/scielo-oai.php||neoichth@nupelia.uem.br1982-02241679-6225opendoar:2020-07-02T00:00Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)false |
dc.title.none.fl_str_mv |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters |
title |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters |
spellingShingle |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters Grempel,Renato Grotta Adrenaline Melanin Concentrating Hormone Melanophores Physiology of Pigmentation Troglobitic Fish |
title_short |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters |
title_full |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters |
title_fullStr |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters |
title_full_unstemmed |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters |
title_sort |
Regression of dark color in subterranean fishes involves multiple mechanisms: response to hormones and neurotransmitters |
author |
Grempel,Renato Grotta |
author_facet |
Grempel,Renato Grotta Trajano,Eleonora Visconti,Maria Aparecida |
author_role |
author |
author2 |
Trajano,Eleonora Visconti,Maria Aparecida |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Grempel,Renato Grotta Trajano,Eleonora Visconti,Maria Aparecida |
dc.subject.por.fl_str_mv |
Adrenaline Melanin Concentrating Hormone Melanophores Physiology of Pigmentation Troglobitic Fish |
topic |
Adrenaline Melanin Concentrating Hormone Melanophores Physiology of Pigmentation Troglobitic Fish |
description |
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. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200214 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200214 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1982-0224-2019-0120 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Ictiologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Ictiologia |
dc.source.none.fl_str_mv |
Neotropical Ichthyology v.18 n.2 2020 reponame:Neotropical ichthyology (Online) instname:Sociedade Brasileira de Ictiologia (SBI) instacron:SBI |
instname_str |
Sociedade Brasileira de Ictiologia (SBI) |
instacron_str |
SBI |
institution |
SBI |
reponame_str |
Neotropical ichthyology (Online) |
collection |
Neotropical ichthyology (Online) |
repository.name.fl_str_mv |
Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI) |
repository.mail.fl_str_mv |
||neoichth@nupelia.uem.br |
_version_ |
1752122183216267264 |