Early spring sex differences in luteinizing hormone response to gonadotropin releasing hormone in co-occurring resident and migrant dark-eyed juncos (Junco hyemalis)

Timothy J. Greives,Adam M. Fudickar,J. Atwell,S. Meddle,E. Ketterson

Published 2016 in General and Comparative Endocrinology

ABSTRACT

Highlights • In early spring female juncos vary in LH following repeated stimulation with GnRH.• Resident and migrant males do not vary in LH.• Suggests the pituitary as a critical point of control for reproductive timing.• Sex difference suggests selection shaped responsiveness at critical time points.

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