Model selection to estimate first-year apparent survival for Prothonotary Warblers, Protonotaria citrea, in southern Illinois, USA, fledging during 2004–2009.

, apparent survival; QAICC, quasi-likelihood Akaike's information criterion corrected for small sample size; wi, Akaike's model weights; K, number of parameters; date, ordinal fledging date; BHCO, reared with cowbird nestmate; noBHCO, absence of cowbird nestmate; cond, nestling body condition; host#, number of warbler nestmates within brood; = , indicates no interaction between terms; ≠, indicates an interaction between terms; year, annual variation; (.), indicates a constant for parameter.