What seeds tell us about birds: a multi-year analysis of acorn woodpecker foraging movements

Table 3 Sample sizes and seed source diversity parameters (α, β, γ) for all acorns sampled from granaries

Sample	Acorn	Number	Source	Foraged	α	β	γ
Year	Crop	Caches	Trees	Acorns	Diversity	Turnover	Diversity
*Quercus lobata*
2002	High	18	42	181	1.85	9.95	18.45
2004	Low	14	23	150	1.38	7.85	10.81
(2002) vs (2004)					P < 0.001		P < 0.003
*Quercus agrifolia*
2006	High	16	46	456	1.62	10.57	17.07
2007	Medium	13	23	199	1.61	6.77	10.86
(2006) vs (2007)					P > 0.500		P < 0.001

Tests of whether the α-diversity or γ-diversity differ between years for each species are based on non-parametric Bartlett’s tests of variance homogeneity (39).

ISSN: 2051-3933