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Insect-eating bat outperforms nectar specialist as pollinator of cactus flowers
Date:12/6/2012

open cactus flowers and uses its long tongue to extract the nectar, transferring pollen from one flower to another in the process. The pallid bat, in contrast, has to land on the flowers and plunge its head deep inside to get to the nectar, resulting in longer visits and more copious accumulations of pollen on its head. In addition, the lesser long-nosed bat relies on pollen as a source of protein and regularly grooms itself during a night of flower visits, removing some of the pollen from its fur and eating it.

Frick, a bat ecologist, had observed pallid bats visiting cardon cactus flowers during earlier research projects in the area and knew that the bats often had pollen on them. For the new study, she teamed up with Kay, an expert in pollination biology and plant evolution. They monitored cactus flowers at 14 study sites in Baja California, working with a team of student assistants from Mexico and UC Santa Cruz. The cardon cactus is a large columnar cactus and is the dominant plant species in the study area. When the researchers saw a bat visit a flower, they would identify the species, climb a ladder to the flower, remove the stigma, and count the number of pollen grains the bat had delivered. They also took data on the number of flower visits by each of the two species at each study site.

The results showed that the pallid bats not only delivered more pollen per visit on average, but in some areas were frequent enough visitors to be more effective pollinators overall than the lesser long-nosed bats.

Plants that are adapted for bat pollination have large, sturdy flowers that bloom at night. The lesser long-nosed bat belongs to a large family of nectar-feeding bats that are important pollinators, especially in tropical habitats. The pallid bat, in contrast, is the only nectar feeder known in its mostly insect-eating family, which is the largest and most widespread family of bats.

"A lot of pollinators come from lineages t
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Contact: Tim Stephens
stephens@ucsc.edu
831-459-2495
University of California - Santa Cruz
Source:Eurekalert

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