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Biologists call for better choice of model organisms in 'evo-devo'

ation events.

"Sometimes evolution speeds up in association with speciation ?an organism can change a lot in this time.

"However, substantial evolutionary change may also occur in the absence of speciation, so basal species are not necessarily, or even likely a more conserved model of the ancestor.

"We need to make better use of the techniques that allow us to calculate how much an organism’s genome has changed over time, when making assessments about how much an animal resembles its ancestor, because this information can be helpful in estimating how much an organism’s phenotype has changed."

Dr Wills added: "Establishing criteria for choosing model organisms is important in this field, especially given the pressure on available funding sources.

"We encourage evo-devo workers to communicate with funding agents so that the limited resources available will not be disproportionately channelled to the ‘big six? which, while important, cannot illuminate all evo-devo’s central themes.

"If we want to understand how insects evolved wings or how legs developed from fins, we need to judiciously choose several models from specific parts of the phylogenetic tree.

"There is little point in blindly increasing the diversity of model systems, without some specific goals in mind.

"Our toolkit is too narrow, so as a community we need to clarify our objectives and set the agenda for future studies."
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Source:University of Bath


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