Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes

Abstract Evolutionary innovations can facilitate diversification if the novel trait enables a lineage to exploit new niches or by expanding character space. The elaborate pharyngeal jaw apparatus of cichlid fishes is often referred to as an evolutionary “key innovation” that has promoted the spectac...

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Autores principales:	Fabrizia Ronco, Walter Salzburger
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	Adaptive radiation key innovation Lake Tanganyika morphological integration Evolution QH359-425
Acceso en línea:	https://doaj.org/article/742010075d394cf9adc6df84c7e2f14b
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spelling	oai:doaj.org-article:742010075d394cf9adc6df84c7e2f14b2021-12-05T14:03:53ZTracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes2056-374410.1002/evl3.257https://doaj.org/article/742010075d394cf9adc6df84c7e2f14b2021-12-01T00:00:00Zhttps://doi.org/10.1002/evl3.257https://doaj.org/toc/2056-3744Abstract Evolutionary innovations can facilitate diversification if the novel trait enables a lineage to exploit new niches or by expanding character space. The elaborate pharyngeal jaw apparatus of cichlid fishes is often referred to as an evolutionary “key innovation” that has promoted the spectacular adaptive radiations in these fishes. This goes back to the idea that the structural and functional independence of the oral and pharyngeal jaws for food capturing and food processing, respectively, permitted each jaw type to follow independent evolutionary trajectories. This “evolutionary decoupling” is thought to have facilitated novel trait combinations and, hence, ecological specialization, ultimately allowing more species to coexist in sympatry. Here, we test the hypotheses of evolutionary decoupling of the oral and pharyngeal jaws in the massive adaptive radiation of cichlid fishes in African Lake Tanganyika. Based on phylogenetic comparative analyses of oral jaw morphology and lower pharyngeal jaw shape across most of the ∼240 cichlid species occurring in that lake, we show that the two jaws evolved coupled along the main axes of morphological variation, yet most other components of these trait complexes evolved largely independently over the course of the radiation. Further, we find limited correlations between the two jaws in both overall divergence and evolutionary rates. Moreover, we show that the two jaws were evolutionary decoupled at a late stage of the radiation, suggesting that decoupling contributed to micro‐niche partitioning and the associated rapidly increasing trophic diversity during this phase.Fabrizia RoncoWalter SalzburgerWileyarticleAdaptive radiationkey innovationLake Tanganyikamorphological integrationEvolutionQH359-425ENEvolution Letters, Vol 5, Iss 6, Pp 625-635 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Adaptive radiation key innovation Lake Tanganyika morphological integration Evolution QH359-425
spellingShingle	Adaptive radiation key innovation Lake Tanganyika morphological integration Evolution QH359-425 Fabrizia Ronco Walter Salzburger Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes
description	Abstract Evolutionary innovations can facilitate diversification if the novel trait enables a lineage to exploit new niches or by expanding character space. The elaborate pharyngeal jaw apparatus of cichlid fishes is often referred to as an evolutionary “key innovation” that has promoted the spectacular adaptive radiations in these fishes. This goes back to the idea that the structural and functional independence of the oral and pharyngeal jaws for food capturing and food processing, respectively, permitted each jaw type to follow independent evolutionary trajectories. This “evolutionary decoupling” is thought to have facilitated novel trait combinations and, hence, ecological specialization, ultimately allowing more species to coexist in sympatry. Here, we test the hypotheses of evolutionary decoupling of the oral and pharyngeal jaws in the massive adaptive radiation of cichlid fishes in African Lake Tanganyika. Based on phylogenetic comparative analyses of oral jaw morphology and lower pharyngeal jaw shape across most of the ∼240 cichlid species occurring in that lake, we show that the two jaws evolved coupled along the main axes of morphological variation, yet most other components of these trait complexes evolved largely independently over the course of the radiation. Further, we find limited correlations between the two jaws in both overall divergence and evolutionary rates. Moreover, we show that the two jaws were evolutionary decoupled at a late stage of the radiation, suggesting that decoupling contributed to micro‐niche partitioning and the associated rapidly increasing trophic diversity during this phase.
format	article
author	Fabrizia Ronco Walter Salzburger
author_facet	Fabrizia Ronco Walter Salzburger
author_sort	Fabrizia Ronco
title	Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes
title_short	Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes
title_full	Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes
title_fullStr	Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes
title_full_unstemmed	Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes
title_sort	tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/742010075d394cf9adc6df84c7e2f14b
work_keys_str_mv	AT fabriziaronco tracingevolutionarydecouplingoforalandpharyngealjawsincichlidfishes AT waltersalzburger tracingevolutionarydecouplingoforalandpharyngealjawsincichlidfishes
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Tracing evolutionary decoupling of oral and pharyngeal jaws in cichlid fishes

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