Parallel Evolution of Allometric Trajectories of Trophic Morphology between Sympatric Morphs of Mesoamerican Astyanax (Characidae)
Por:
Garita-Alvarado, Carlos A., Patricia Ornelas-Garcia, Claudia
Publicada:
1 sep 2021
Resumen:
Parallel evolution of the body shape and trophic-related traits has been
detected between sympatric pairs of lake-dwelling characin fishes in
Mesoamerica. Here, we evaluated the variation in and the ontogenetic
allometric trajectories of trophic morphology between sympatric Astyanax
morphs (elongate and deep-body) in two geographic systems, Lake Catemaco
(Mexico) and San Juan River basin (Nicaragua and Costa Rica). Using
geometric morphometrics, we determined the shape variation and disparity
in the premaxillary bone, and the patterns of allometric trajectories
between morphs in each system. We found a higher differentiation and
disparity in the premaxilla shape between morphs from San Juan River
basin than between the Lake Catemaco ones. We found shared (parallel
evolution) patterns of divergence between systems, which included
allometric trajectories showing a positive correlation between the
premaxilla shape and log centroid size, as well as trajectories being
extended in the elongated-body morph (truncated in the deep-body morph).
Regarding the unique patterns of divergence, we recovered parallel
allometric trajectories between morphs from Lake Catemaco, while the San
Juan River basin morphs showed divergent trajectories. Our results are
congruent with the hypothesis that divergence in trophic morphology can
be considered a triggering factor in the divergence in the genus
Astyanax from Mesoamerica.
Filiaciones:
Patricia Ornelas-Garcia, Claudia:
Ornelas-Garcia, CP (Corresponding Author), Univ Nacl Autonoma Mexico, Inst Biol, Dept Zool, Tercer Circuito Exterior S-N, Ciudad De Mexico 04510, Mexico. Garita-Alvarado, Carlos A
Gold
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