The evolution and genetic basis of a functionally critical skull bone, the parasphenoid, among Lake Malawi cichlids DOI Creative Commons
Andrew J. Conith, Stefano Pascarella,

Sylvie A. Hope

et al.

Evolutionary Journal of the Linnean Society, Journal Year: 2024, Volume and Issue: 3(1)

Published: Jan. 1, 2024

Abstract Adaptive radiation, whereby a clade pairs rapid speciation with phenotypic evolution, can result in an uneven distribution of biodiversity across the Metazoan tree. The cichlid fishes East Africa have undergone multiple adaptive radiations within major rift lakes. Cichlid are marked by divergence distinct habitat gradients producing many morphological and behavioural adaptations. Here, we characterize shape parasphenoid, bone neurocranium that dissipates forces generated during feeding. We examine Tropheops, group has transitioned between deep shallow habitats times, to habitat-specific differences parasphenoid shape. find depth length Tropheops residing each habitat, variation may impact ability cranium resist force. next use hybrid cross two species differ shape, Labeotropheus genetic basis these differences. perform mapping identify genomic regions responsible for These implicated other functional traits including oral jaws neurocranium, indicating landscape evolution be limited few loci broad effects. Repurposing same gene(s) via regulatory sufficient selection drive transitions important incipient stages radiations.

Language: Английский

A classic key innovation constrains oral jaw functional diversification in fishes DOI Creative Commons
Alexus S. Roberts, Christopher M. Martinez, Katherine A. Corn

et al.

Evolution Letters, Journal Year: 2024, Volume and Issue: 9(1), P. 24 - 40

Published: Oct. 8, 2024

Abstract Modifications to the pharyngeal jaws—a prey processing system located posterior mouth cavity—are widely considered a key innovation that enhanced diversification within several prominent fish clades. Seen in cichlids, damselfishes, wrasses, and few other lineages, these musculoskeletal alterations are believed increase evolutionary independence and, thus, of oral jaw systems. To test this classic hypothesis, we conducted comparative phylogenetic analyses assess effect novelty on feeding morphology kinematics across taxonomically diverse sample spiny-rayed fishes. We quantified movements jaws craniofacial structures from 689 suction-feeding strikes using high-speed videos collected 228 species with without novelty. Contradicting long-held predictions, find significantly greater disparity all traits faster rates functional evolution fishes specialized system. The modified is undoubtedly as it enhances strength system, facilitating exceptional transition hard tough prey. However, also restricts revealing impact pharyngognathy more nuanced than previously thought. In light recent findings, reinterpretation macroevolutionary consequences needed.

Language: Английский

Citations

2
Suction feeding turned on its head: a functional novelty facilitates lower jaw protrusion DOI
Christopher M. Martinez,

Rizelle Mae M Mazon,

Melanie L. J. Stiassny

et al.

Integrative and Comparative Biology, Journal Year: 2024, Volume and Issue: 64(3), P. 729 - 741

Published: July 3, 2024

Synopsis Functional novelties play important roles in creating new ways for organisms to access resources. In fishes, jaw protrusion has been attributed the massive diversity of suction-based feeding systems, facilitating dominant mode prey capture this group. Nearly all fishes that feed by suction use upper protrusion, achieved rotation mandible at its base, which then transmits forward motion independently mobile bones. study, contrast, we explore an unusual form lower freshwater invertivore, Nannocharax fasciatus, enabled a novel intramandibular joint (IMJ). We combine morphological, kinematic, and biomechanical data show added mobility created IMJ influences pattern movements contributes (increasing it 25%, based on modeling). Interestingly, bones are fused N. fasciatus rotate about single fixed joint, like jaws most other fishes. suggest vertical inversion mechanism ventrally directed suction-feeding benthic is likely exaptation, as used biting related taxa. This work highlights ability facilitate ecological specialization enabling functional capabilities.

Language: Английский

Citations

1
The evolution and genetic basis of a functionally critical skull bone, the parasphenoid, among Lake Malawi cichlids DOI Creative Commons
Andrew J. Conith, Stefano Pascarella,

Sylvie A. Hope

et al.

Evolutionary Journal of the Linnean Society, Journal Year: 2024, Volume and Issue: 3(1)

Published: Jan. 1, 2024

Abstract Adaptive radiation, whereby a clade pairs rapid speciation with phenotypic evolution, can result in an uneven distribution of biodiversity across the Metazoan tree. The cichlid fishes East Africa have undergone multiple adaptive radiations within major rift lakes. Cichlid are marked by divergence distinct habitat gradients producing many morphological and behavioural adaptations. Here, we characterize shape parasphenoid, bone neurocranium that dissipates forces generated during feeding. We examine Tropheops, group has transitioned between deep shallow habitats times, to habitat-specific differences parasphenoid shape. find depth length Tropheops residing each habitat, variation may impact ability cranium resist force. next use hybrid cross two species differ shape, Labeotropheus genetic basis these differences. perform mapping identify genomic regions responsible for These implicated other functional traits including oral jaws neurocranium, indicating landscape evolution be limited few loci broad effects. Repurposing same gene(s) via regulatory sufficient selection drive transitions important incipient stages radiations.

Language: Английский

Citations

0