EXPERIMENTALLY REDUCING NEIGHBOR DENSITY AFFECTS REPRODUCTION AND BEHAVIOR OF A MIGRATORY SONGBIRD

By Scott Sillett, Nicholas, Rodenhouse, Richard, Holmes. 2004

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MEASURING HABITAT QUALITY: A REVIEW (2007, background): “Over most population densities, intraspecific competition diminishes the fitness conferred upon a habitat’s occupants (Rodenhouse et al. 2003, Sillett et al. 2004).”
Adaptive phenotypic plasticity in an island songbird exposed to a novel predation risk (2008, unknown): “We mapped all warbler territories on the plots (see Sillett et al. 2004), banded adults, and found and monitored nests.”
Sequential settlement and site dependence in a migratory raptor (2007, background): “These are the exact conditions under which crowding is most expected (Sillett et al. 2004).”
Dynamic occupancy models reveal within-breeding season movement up a habitat quality gradient by a migratory songbird (2008, background): “…reproduction and survival of black-throated blue warblers is greatest a) at higher elevation sites where food becomes more abundant during the breeding season (Rodenhouse et al. 2003) and b) at sites with an abundant shrub layer (Holmes et al. 1996, Rodenhouse et al. 2003, Sillett et al. 2004).”
Recent advances in understanding migration systems of New World land birds (2010, background): “Experimental reductions in density of Black-throated Blue Warblers resulted in higher reproductive output (Sillett et al. 2004), illustrating the mechanism for this density dependence.”