Extreme overlap between first and second nestings in the Rose-breasted Grosbeak

TitleExtreme overlap between first and second nestings in the Rose-breasted Grosbeak
Publication TypeJournal Article
Year of Publication1973
AuthorsRothstein SI
JournalThe Wilson Bulletin
Volume85
Pagination242-243
KeywordsPHEUCTICUS
Abstract

The adaptive value of raising more than one brood per year is obvious and one might expect broods to be closely spaced or even to overlap so as to maximize reproductive output. But countering this is the fact that it may be impossible to meet successfully the demands of two broods at the same time. ...Although the Rose-breasted Grosbeak (Pheucticus ludovicianus) is generally thought to be single brooded, I have noted one instance in which two nestings overlapped to a greater extent than is apparently known for any other North American passerine.