Figure 1.

Mean standing crops of nectar ± s.e. (µl per flower) of Heliconia caribaea on territories of seven mated and five unmated male purple-throated caribs and five undefended sites at four different time intervals (06.30–08.30, 08.30–10.30, 10.30–12.30 and 12.30–14.30, abbreviated 06.30, 08.30, 10.30 and 12.30). Standing crops on undefended sites were not significantly different from those on male territories for 06.30–08.30, but were significantly lower than on territories of mated males for the latter three time categories and on territories of unmated males for 12.30–14.30. Standing crops also were significantly lower for unmated as opposed to mated males for 08.30–10.30, 10.30–12.30 and 12.30–14.30 (t-tests and paired t-tests with Bonferroni adjustments, p < 0.05 overall).