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VARIATION IN DEVELOPMENTAL CONSTRAINTS IN SIGMODON.

Miriam Leah Zelditch1,2, Donald O Straney1,2, Donald L Swiderski

  • 1Department of Zoology, Michigan State University, E. Lansing, MI, 48824, USA.

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This summary is machine-generated.

Developmental constraints influence covariation in cotton rat measurements. Differences in these factors across Sigmodon taxa allow for evolutionary divergence, despite shared underlying developmental patterns.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Comparative anatomy

Background:

  • Developmental constraints are factors influencing trait covariation, potentially impacting evolution.
  • Hypotheses link developmental constraints to evolutionary trajectories.
  • Cotton rats (genus Sigmodon) provide a model for studying these relationships.

Purpose of the Study:

  • To compare developmental factors underlying morphological variation across Sigmodon taxa.
  • To investigate how differences in developmental constraints affect evolutionary potential.

Main Methods:

  • Confirmatory factor analysis was employed to analyze orofacial and neurocranial measurements.
  • Covariation patterns and factor variances were compared among selected Sigmodon species.

Main Results:

  • Three primary factors explain orofacial covariation: body size, tooth complex growth, and musculoskeletal interactions.
  • Sigmodon taxa share these orofacial factors but differ in their variances and covariances.
  • Neurocranial covariation is weakly constrained, primarily reflecting body size and fetal brain growth responses, with no significant inter-taxa differences.

Conclusions:

  • Despite shared developmental factors, variations in their expression (variances and covariances) and unique trait variances offer distinct avenues for natural selection.
  • These differences in developmental constraints do not preclude evolutionary divergence within the Sigmodon genus.