Understanding the origin and elaboration of complex traits is of fundamental interest to scientists and non-scientists alike. Darwin was the first to propose a mechanistic explanation for the evolution of complex traits by suggesting that complexity can evolve by a gradual stepw…
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Lesser scaup ( Aythya affinis ; scaup) comprise 89% of the continental breeding population of scaup (greater, Aythya marila , and lesser combined) which has declined nearly 60% over the past 5 decades from an estimated 7.9 million in 1972 to a historical low of 3.2 million in 20…