Reproduction, development, asymmetry and late eye regression in the Brazilian cave catfish Ituglanis passensis (Siluriformes, Trichomycteridae): evidence contributing to the neutral mutation theory

IF 1.3 3区生物学 Q2 ZOOLOGY

Subterranean Biology Pub Date : 2021-04-19 DOI:10.3897/SUBTBIOL.31.60691

Sandro Secutti, E. Trajano

{"title":"Reproduction, development, asymmetry and late eye regression in the Brazilian cave catfish Ituglanis passensis (Siluriformes, Trichomycteridae): evidence contributing to the neutral mutation theory","authors":"Sandro Secutti, E. Trajano","doi":"10.3897/SUBTBIOL.31.60691","DOIUrl":null,"url":null,"abstract":"The troglobitic (exclusively subterranean source population) catfish Ituglanis passensis (Siluriformes, Trichomycteridae) is endemic to the Passa Três Cave, São Domingos karst area, Rio Tocantins basin, Central Brazil. This unique population presents variably reduced eyes and melanic pigmentation. We describe reproduction and early development in this species based on a spontaneous (non-induced) reproductive-event that occurred in the laboratory in January–February, 2009, while simultaneously comparing with data from the cave-habitat and a previous reproductive event. Egg laying was parceled. Egg-size and number were within variations observed in epigean congeners. Larvae behavior and growth is described. A single surviving specimen was monitored over two years. Eye-regression started late, one year after birth, and followed a pattern of stasis phases intercalated with slow growth and fluctuating asymmetric rates. Late eye regression, associated with asymmetry in eye development and intra-population variability of troglomorphic traits, as shown by several Brazilian subterranean fishes, provide support for the Neutral Mutation Theory.","PeriodicalId":48493,"journal":{"name":"Subterranean Biology","volume":"38 1","pages":"91-112"},"PeriodicalIF":1.3000,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Subterranean Biology","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.3897/SUBTBIOL.31.60691","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ZOOLOGY","Score":null,"Total":0}

引用次数: 3

Abstract

The troglobitic (exclusively subterranean source population) catfish Ituglanis passensis (Siluriformes, Trichomycteridae) is endemic to the Passa Três Cave, São Domingos karst area, Rio Tocantins basin, Central Brazil. This unique population presents variably reduced eyes and melanic pigmentation. We describe reproduction and early development in this species based on a spontaneous (non-induced) reproductive-event that occurred in the laboratory in January–February, 2009, while simultaneously comparing with data from the cave-habitat and a previous reproductive event. Egg laying was parceled. Egg-size and number were within variations observed in epigean congeners. Larvae behavior and growth is described. A single surviving specimen was monitored over two years. Eye-regression started late, one year after birth, and followed a pattern of stasis phases intercalated with slow growth and fluctuating asymmetric rates. Late eye regression, associated with asymmetry in eye development and intra-population variability of troglomorphic traits, as shown by several Brazilian subterranean fishes, provide support for the Neutral Mutation Theory.

查看原文本刊更多论文

巴西洞鲶鱼Ituglanis passensis (Siluriformes, trichomycidae)的繁殖、发育、不对称和晚期眼退化:中性突变理论的证据

巴西中部里奥托坎廷斯盆地são Domingos喀斯特地区Passa Três洞穴特有的三球目（仅地下来源种群）鲶鱼Ituglanis passensis（志留目，毛霉菌科）。这种独特的人群呈现出不同程度的眼部减少和黑色素沉着。我们根据2009年1月至2月在实验室发生的自发（非诱导）繁殖事件描述了该物种的繁殖和早期发育，同时与洞穴栖息地和以前繁殖事件的数据进行了比较。产卵是用小块的。蛋的大小和数量在表观同源物中观察到的变化范围内。描述了幼虫的行为和生长。对一个幸存的标本进行了两年多的监测。眼睛退化开始较晚，出生后一年，遵循停滞期模式，其间夹杂着缓慢的生长和波动的不对称比率。如几条巴西地下鱼类所示，与眼睛发育的不对称性和套型性状的种群内变异性相关的晚期眼睛退化为中性突变理论提供了支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Subterranean Biology ZOOLOGY-

CiteScore

2.50

自引率

18.20%

发文量

审稿时长

6 weeks

期刊介绍： Subterranean Biology is an international journal published by Pensoft on behalf of the International Society for Subterranean Biology [SIBIOS-ISSB] for the publication of original and significant contributions on all aspects of subterranean life. The Journal will consider original scientific papers dealing with any aspect of subterranean ecosystems and their components focusing on biology, ecology, evolution and conservation. Reviews and Commentaries: The journal welcomes review articles on aspects of subterranean biology. They should be submitted in the same way as research articles but use a simple layout with no more than three levels of headings. Commentaries on previous matter published in the journal may be also considered. Both reviews and commentaries will be reviewed. Book Reviews: Reviews of books, symposia volumes and conferences pertinent to the journal are welcome. The journal publishes electronic versions of the articles when these are ready to publish, without delays that might be caused by completion of an issue. These electronic versions are not "pre-prints" but final and immutable (Version of Record), hence available for the purposes of biological nomenclature. The date indicated on the electronic version is to be considered the actual publication date.