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Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila

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Published on: October 1, 2011

On the relationship between ontogenetic and static allometry.

Christophe Pélabon¹, Geir H Bolstad, Camilla K Egset

¹Centre for Conservation Biology, Department of Biology, University of Science and Technology NTNU, 7491 Trondheim, Norway. christophe.pelabon@ntnu.no

The American Naturalist

|January 26, 2013

Summary

This summary is machine-generated.

Static and ontogenetic allometry describe size changes during development and among individuals. Our study reveals how ontogenetic allometry influences static allometry, suggesting selection, not development, shapes evolutionary stasis.

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Area of Science:

Evolutionary biology
Developmental biology
Quantitative genetics

Background:

Ontogenetic allometry tracks size changes during organism development.
Static allometry examines size variation among individuals at a fixed developmental stage.
The interplay between these allometries is key to understanding shape evolution, but remains understudied.

Purpose of the Study:

To analytically investigate how individual variation in ontogenetic allometry and body size impact static allometry.
To empirically estimate the contribution of ontogenetic allometry parameters to static allometric slopes using longitudinal data.
To elucidate the drivers of evolutionary stasis in allometric relationships.

Main Methods:

Analytical modeling of static allometry influenced by ontogenetic allometry variations.
Estimation of variances and covariances for ontogenetic allometry parameters from two longitudinal datasets.
Assessment of parameter contributions to the static allometric slope.

Main Results:

The mean ontogenetic allometry primarily dictates the static allometric slope.
Covariance between ontogenetic allometric slope and body size explains discrepancies between static and ontogenetic allometry.
Individual variation in ontogenetic allometry significantly affects static allometry.

Conclusions:

Evolutionary stasis in static allometric slopes likely arises from external selective pressures, not internal developmental constraints.
Understanding the relationship between ontogenetic and static allometry is crucial for evolutionary studies of shape.
Individual variation in developmental trajectories plays a significant role in shaping adult form variation.