In this book, the biologist Raghavendra Gadagkar focuses on the
single species he has worked on throughout his career. Found
throughout southern India, "Ropalidia marginata" is a primitively
eusocial wasp--a species in which queens and workers do not differ
morphologically and even the latter retain the ability to
reproduce. New colonies may be founded by a single fertile female
or by several, which then share reproductive and worker duties.
"R. marginata" has provided Gadagkar with a unique opportunity
to study the evolution of eusociality; its long-lived dynasties can
continue almost indefinitely, as old or weakened queens are
replaced by young and healthy ones and new colonies are founded
throughout the year. Understanding such primitively eusocial
species is crucial, Gadagkar argues, if we are to understand the
evolution of the greater degrees of sociality found in other wasp
species and in ants, termites, and bees. His years of study have
led him to believe that ecological, physiological, and demographic
factors can be more important than genetic relatedness in the
selection for or against social traits.
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