Evolutionary negative allometry of orthopteran hind femur length is a general phenomenon
1. Body size influences the way that organisms both perform their locomotor activities and perceive their environment. Allometry of insect legs with respect to body size is affected by many factors such as ontogenetic constraints and natural selection. Negative allometry, positive allometry, or isometry could result from different mechanisms influencing leg length and locomotion performance. 2. We tested three main models of hind femur length allometry (natural selection for jumping performance, ontogenetic constraint, and the size-grain model) in Orthoptera, a Polyneopteran order with large size range and high habitat and lifestyle diversification. We used a data set of 1549 species including members of both suborders, Ensifera and Caelifera, and many representative families using a Linear Mixed Model approach, and Reduced Major Axis and Ordinary Least Squares regression to explore evolutionary interspecific allometry in this order. 3. Our results showed a generalized trend of negative allometry (leg length decreases with body size increase) at the ordinal, subordinal, and familial levels, contrary to the expectations of the size-grain model and supporting our main hypothesis of a common ancestral developmental pattern regulating leg negative allometry in Orthoptera. 4. The conservation of a common hind leg allometric pattern in Orthoptera provides a basic framework to study adaptation of hind limbs to different habitats and lifestyles, and has important implications for the analysis of ecogeographic and evolutionary rules.
KeywordsJumping allometry Habitat coarseness Linear Mixed Model Ontogenetic allometry Sexual allometry Static allometry
We are grateful to Andrea Cardini and an anonymous reviewer for their expert comments and suggestions that greatly improved the first version of the manuscript. We also wish to heartily thank Talita Ferreira Amado for graciously letting us to use her drawing of Dichroplus pratensis used for Fig. 1. CJB thanks Bettina Gordo D’Amico for her hospitality in Buenos Aires during the writing of this paper.
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This article complies with the journal’s ethical standards.
Conflict of interest
The authors declare that they have no conflict of interest.
Human and animals rights
This article does not contain any studies with human participants or animals performed by any of the authors.
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