Developmental basis of phenotypic integration in two Lake Malawi cichlids

EvoDevo
Pierre Le PabicThomas F Schilling

Abstract

Cichlid fishes from the Rift Lakes of East Africa have undergone the most spectacular adaptive radiations in vertebrate history. Eco-morphological adaptations in lakes Victoria, Malawi and Tanganyika have resulted in a vast array of skull shapes and sizes, yet primary axes of morphological variation are conserved in all three radiations, prominently including the size of the preorbital region of the skull. This conserved pattern suggests that development may constrain the trajectories of cichlid head morphological evolution. Here, we (1) present a comparative analysis of adult head morphology in two sand-dweller cichlids from Lake Malawi with preorbital size differences representative of the main axis of variation among the three lakes and (2) analyze the ontogeny of shape and size differences by focusing on known developmental modules throughout the head. We find that (1) developmental differences between the two species correlate with known developmental modules; (2) differences in embryonic cartilage development result in phenotypically integrated changes among all bones derived from a single cartilage, while differences in dermal bone development tend to influence isolated regions within a bone; and lastly (3) species-speci...Continue Reading

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Citations

Oct 17, 2017·Genome Biology and Evolution·Pooja SinghChristian Sturmbauer
Sep 22, 2018·Evolution & Development·Denis V Prazdnikov, Fedor N Shkil
Sep 22, 2017·Zebrafish·Sarah McMenaminWiliam James Cooper
Aug 28, 2020·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Brian P HeubelPierre Le Pabic
Feb 23, 2021·Ecology and Evolution·Philippe S MunyandamutsaAustin Mtethiwa
Apr 24, 2021·BMC Ecology and Evolution·Pooja SinghChristian Sturmbauer
Jun 18, 2021·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Seyed Ehsan Mousavi, Jawahar G Patil

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Software Mentioned

Improvision
CoordGen8
ImageJ
CVAGen8
Controller
DP
Volocity
ggplot2

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