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New perspectives on the evolution of exaggerated traits
Author(s) -
Shingleton Alexander W.,
Frankino W. Anthony
Publication year - 2013
Publication title -
bioessays
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.175
H-Index - 184
eISSN - 1521-1878
pISSN - 0265-9247
DOI - 10.1002/bies.201200139
Subject(s) - trait , evolutionary biology , scaling , selection (genetic algorithm) , biology , morphology (biology) , sexual selection , biological evolution , scale (ratio) , natural selection , genetics , computer science , artificial intelligence , geography , geometry , mathematics , cartography , programming language
The scaling of body parts is central to the evolution of morphology and shape. Most traits scale proportionally with each other and body size such that larger adults are essentially magnified versions of smaller ones. This pattern is so ubiquitous that departures from it – disproportionate scaling between trait and body size – pique interest because it can generate dramatically exaggerated traits. These extreme morphologies are frequently hypothesized to result from sexual selection and their study has a long history, with several hypotheses seeking to explain their evolution. Despite this effort, surprisingly little progress has been made in demonstrating the forms of selection that produce different scaling patterns or in identifying the mechanisms that underlie the expression and evolution of scaling relationships. Here we review recent insights regarding the proximate mechanisms that regulate and integrate trait growth and that offer a new framework for studying the evolution of morphological scaling.