TY  - RPRT
TI  - Does increasing daylength control seasonal changes in clutch sizes of Northern Pintails ( Anas acuta )?
AU  - Gary L. Krapu
AU  - G.A. Sargeant
AU  - A.E.H. Perkins
PY  - 2002
DO  - 10.1642/0004-8038(2002)119[0498:didcsc]2.0.co;2
UR  - https://pubs.usgs.gov/publication/70024995
ID  - 70024995
ER  -