Diurnal song pattern in the great reed warbler Acrocephalus arundinaceus

Abstract

Great reed warbler was studied at Lake Kvismaren, Sweden. Males sing two types of song, a long song when attracting females and a short song when guarding fertile females. The decline in the rate of long song over the day seemed to be paralleled by a decline in number of unmated females, suggesting that profitability of singing is highest during early morning whereafter it levels off. -from Authors