Table 2.

Standardized selection gradients (β′) from stepwise multiple regression of six male traits and territory characteristics against nectar standing crop for 12 territorial male purple-throated caribs. Only variables with p < 0.05 are shown.

male character	β′± s.e.	statistic	p
heterospecific thefts per hour	−0.58 ± 0.17	t1 = −3.35	0.008
tarsus length	0.42 ± 0.17	t1 = 2.45	0.037