K. A. Rosvall

This study shows that female dark-eyed juncos breed earlier in response to warmer springs, with plasticity in timing playing a key role in phenological shifts due to climate change.

This study compares territorial aggression and testosterone levels between cavity-nesting and non-cavity-nesting birds, finding increased aggression but no difference in testosterone.

This study examines testosterone secretion in Northern Jacanas, finding similar levels in females and incubating males but higher in copulating males, suggesting physiological regulation of competitive traits differs between sexes and parental roles.