Cargando…
Congruent geographic variation in saccular otolith shape across multiple species of African cichlids
The otoliths of teleost fishes exhibit a great deal of inter- and intra-species shape variation. The ecomorphology of the saccular otolith is often studied by comparing its shape across species and populations inhabiting a range of environments. However, formal tests are often lacking to examine how...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7393159/ https://www.ncbi.nlm.nih.gov/pubmed/32733082 http://dx.doi.org/10.1038/s41598-020-69701-9 |
_version_ | 1783564988693086208 |
---|---|
author | Bose, Aneesh P. H. Zimmermann, Holger Winkler, Georg Kaufmann, Alexandra Strohmeier, Thomas Koblmüller, Stephan Sefc, Kristina M. |
author_facet | Bose, Aneesh P. H. Zimmermann, Holger Winkler, Georg Kaufmann, Alexandra Strohmeier, Thomas Koblmüller, Stephan Sefc, Kristina M. |
author_sort | Bose, Aneesh P. H. |
collection | PubMed |
description | The otoliths of teleost fishes exhibit a great deal of inter- and intra-species shape variation. The ecomorphology of the saccular otolith is often studied by comparing its shape across species and populations inhabiting a range of environments. However, formal tests are often lacking to examine how closely variation in otolith shape follows the genetic drift of a neutral trait. Here, we examine patterns of saccular otolith shape variation in four species of African cichlid fishes, each sampled from three field sites. All four species showed the greatest level of otolith shape variation along two principal component axes, one pertaining to otolith height and another to the prominence of an anterior notch. Fish collected from the same site possessed similarities in saccular otolith shape relative to fish from other sites, and these ‘site-difference’ signatures were consistent across species and observable in both sexes. Sex-differences in saccular otolith shape differed in magnitude from site to site. Population differences in saccular otolith shape did not covary with neutral genetic differentiation between those populations. Otolith height, in particular, displayed large site similarities across species, weak correlation with neutral genetic variation, and strong sex differences, collectively suggesting that otolith shape represents a selectively non-neutral trait. |
format | Online Article Text |
id | pubmed-7393159 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-73931592020-08-03 Congruent geographic variation in saccular otolith shape across multiple species of African cichlids Bose, Aneesh P. H. Zimmermann, Holger Winkler, Georg Kaufmann, Alexandra Strohmeier, Thomas Koblmüller, Stephan Sefc, Kristina M. Sci Rep Article The otoliths of teleost fishes exhibit a great deal of inter- and intra-species shape variation. The ecomorphology of the saccular otolith is often studied by comparing its shape across species and populations inhabiting a range of environments. However, formal tests are often lacking to examine how closely variation in otolith shape follows the genetic drift of a neutral trait. Here, we examine patterns of saccular otolith shape variation in four species of African cichlid fishes, each sampled from three field sites. All four species showed the greatest level of otolith shape variation along two principal component axes, one pertaining to otolith height and another to the prominence of an anterior notch. Fish collected from the same site possessed similarities in saccular otolith shape relative to fish from other sites, and these ‘site-difference’ signatures were consistent across species and observable in both sexes. Sex-differences in saccular otolith shape differed in magnitude from site to site. Population differences in saccular otolith shape did not covary with neutral genetic differentiation between those populations. Otolith height, in particular, displayed large site similarities across species, weak correlation with neutral genetic variation, and strong sex differences, collectively suggesting that otolith shape represents a selectively non-neutral trait. Nature Publishing Group UK 2020-07-30 /pmc/articles/PMC7393159/ /pubmed/32733082 http://dx.doi.org/10.1038/s41598-020-69701-9 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Bose, Aneesh P. H. Zimmermann, Holger Winkler, Georg Kaufmann, Alexandra Strohmeier, Thomas Koblmüller, Stephan Sefc, Kristina M. Congruent geographic variation in saccular otolith shape across multiple species of African cichlids |
title | Congruent geographic variation in saccular otolith shape across multiple species of African cichlids |
title_full | Congruent geographic variation in saccular otolith shape across multiple species of African cichlids |
title_fullStr | Congruent geographic variation in saccular otolith shape across multiple species of African cichlids |
title_full_unstemmed | Congruent geographic variation in saccular otolith shape across multiple species of African cichlids |
title_short | Congruent geographic variation in saccular otolith shape across multiple species of African cichlids |
title_sort | congruent geographic variation in saccular otolith shape across multiple species of african cichlids |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7393159/ https://www.ncbi.nlm.nih.gov/pubmed/32733082 http://dx.doi.org/10.1038/s41598-020-69701-9 |
work_keys_str_mv | AT boseaneeshph congruentgeographicvariationinsaccularotolithshapeacrossmultiplespeciesofafricancichlids AT zimmermannholger congruentgeographicvariationinsaccularotolithshapeacrossmultiplespeciesofafricancichlids AT winklergeorg congruentgeographicvariationinsaccularotolithshapeacrossmultiplespeciesofafricancichlids AT kaufmannalexandra congruentgeographicvariationinsaccularotolithshapeacrossmultiplespeciesofafricancichlids AT strohmeierthomas congruentgeographicvariationinsaccularotolithshapeacrossmultiplespeciesofafricancichlids AT koblmullerstephan congruentgeographicvariationinsaccularotolithshapeacrossmultiplespeciesofafricancichlids AT sefckristinam congruentgeographicvariationinsaccularotolithshapeacrossmultiplespeciesofafricancichlids |