Does Height Off the Ground Affect Bird Visitation and Fruit Set in the Pollen-Limited Mistletoe Peraxilla tetrapetala (Loranthaceae)?
Article first published online: 2 JUN 2007
Volume 40, Issue 1, pages 122–126, January 2008
How to Cite
Robertson, A. W., Ladley, J. J. and Kelly, D. (2008), Does Height Off the Ground Affect Bird Visitation and Fruit Set in the Pollen-Limited Mistletoe Peraxilla tetrapetala (Loranthaceae)?. Biotropica, 40: 122–126. doi: 10.1111/j.1744-7429.2007.00329.x
- Issue published online: 2 JUN 2007
- Article first published online: 2 JUN 2007
- Received 12 October 2006; revision accepted 6 February 2007.
- Anthornis melanura;
- height effects;
- New Zealand;
- pollen limitation;
- sampling bias;
- vertical stratification
For pollination studies of forest species it is sometimes only possible to work on those flowers nearest to the ground. We test whether using low flowers introduces bias, by measuring height effects on bird visitation and fruit set in one mistletoe species pollinated by bellbirds in New Zealand. At this site, previous studies have shown fruit set near the ground to be pollen limited. We measured fruit set on 32 mistletoes at different heights in 11 host trees. Mistletoe fruit set varied significantly among host trees but did not vary with height. Although bellbirds generally forage preferentially in the upper part of the forest, mistletoe flowers appear to be attractive enough to ensure adequate visitation and fruit set at all heights.