a result
opposite of that predicted by the time/energy saving hypothesis,
but consistent with the nest site shortage hypothesis’ prediction
that nest reuse should be more common in years of reduced nest
site availability. Most females at the Bridge Creek site in 2011 used
an artificial nest when it was available (71.4%; 5 of 7 females). Nest
success was low in 2010 (see below), and only three of seven ringed
females from Buena Vista were detected in 2011. These three females
bred successfully in natural nests in 2010 but switched to
artificial nests in 2011. Of females with access to artificial nests,
the probability that one would be used was lower later in the
season than it was early in the season (logistic regression:
b¼0.110 0.043, P ¼ 0.010), a result again opposite of that predicted
by the time/energy saving hypothesis.