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Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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Darter fishes exhibit variable intraspecific head shape allometry and modularity.

Maris R Goodwin1, Jessica H Arbour1

  • 1Department of Biology, Middle Tennessee State University, Murfreesboro, Tennessee, USA.

Anatomical Record (Hoboken, N.J. : 2007)
|September 25, 2022
PubMed
Summary
This summary is machine-generated.

Allometry influences darter fish head shape diversity. Ontogenetic shape development and gape limitation contribute to varied adult head morphologies, impacting foraging traits and microhabitat evolution.

Keywords:
EtheostomatinaePercidaeecomorphologygeometric morphometricsontogeny

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Ichthyology

Background:

  • Allometry, the study of body size and anatomical proportion relationships, can influence morphological diversification.
  • Darter fish exhibit diverse trophic morphologies, making them an ideal model for studying allometry's impact.
  • Understanding allometry's role is crucial for explaining the evolution of species' physical traits.

Purpose of the Study:

  • To investigate variations in darter fish head allometry.
  • To determine if allometry contributes to adult head shape diversity.
  • To assess head shape modularity in relation to allometry in darters.

Main Methods:

  • Utilized geometric morphometrics to analyze head shape in 10 darter species.
  • Tested for heterogeneity in allometric slopes across species.
  • Quantified head shape modularity in preorbital and postorbital regions, with and without body size correction.

Main Results:

  • Significant species-specific differences in allometric slopes were observed, especially in the Simoperca subgenus.
  • Closely related species showed ontogenetic divergence in head shape, contributing to adult diversity.
  • Head shape modularity was present in several species but evolutionarily labile and inconsistently affected by allometry.

Conclusions:

  • Ontogenetic shape development plays a significant role in darter head shape evolution.
  • Gape limitation in juveniles may drive early-life dietary similarities and subsequent head shape divergence.
  • Allometry and modularity interact dynamically, shaping foraging traits and microhabitat adaptations in darters.