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

hat are quite old and have been coevolving with plants for a long time," Kay said. "You might think that a new pollinator would not be a good pollinator, but in this case it's actually a better pollinator because it's not well adapted for nectar-feeding. It's exciting to get a glimpse of what the initial stages might be in the evolution of a novel feeding behavior."

Frick said she has video of a pallid bat attacking a large moth on a flower, so it's not hard to imagine how the insect-eating pallid bats might have discovered the sweet nectar hidden inside cactus flowers.

Kay noted that many animals that visit flowers are just feeding without pollinating the flowers or otherwise benefiting the plants. There are also examples of invasive pollinators that disrupt a coevolved plant-pollinator relationship and do a worse job of pollination. "In this case it's the evolutionarily newer pollinator doing a better job, and I haven't seen that before," she said.

The lesser long-nosed bats were effective pollinators of cardon cactus flowers at many of the study sites. But the study found considerable variation between sites, and because the lesser long-nosed bat is migratory, there may be variability from year to year as well, Frick said. The greater variability of the migratory lesser long-nosed bats could make the resident pallid bats especially important as pollinators of cardon cactus.

"The lesser long-nosed bat is an adequate pollinator, but there is a lot of variation in where they occur. We would like to look at that variation over several years," Frick said.


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Contact: Tim Stephens
stephens@ucsc.edu
831-459-2495
University of California - Santa Cruz
Source:Eurekalert

Page: 1 2 3

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