Tuesday, August 7, 2007 - 4:20 PM

COS 55-9: Restoring and monitoring vegetation, habitat, and bee pollinators in a lowland seasonal dry forest in northwestern Costa Rica

Gordon W. Frankie, University of California Berkeley, Terry L. Griswold, USDA, and S. B. Vinson, Texas A&M University.


One challenge for researchers working on global pollinator decline issues is the need for effective monitoring methods to detect short and long-term trends in pollinator populations that have received considerable monitoring attention during the past several years.  In a long-term study in northwestern Guanacaste Province, Costa Rica, we planted from seed replications of 60 known native bee-plant species in 2000 (mostly trees) in a 3 Ha plot at a fallowed pasture site within an active cattle ranch, which was surrounded by moderately disturbed wild land forest/wooded savanna.  One project goal was to monitor native bees and honey bees every 5 years on the host plants beginning in mid 2002.  Almost half of the known bee species from the surrounding region (~125 of ~250) were collected over a 12-month period to establish a comparative baseline of bee diversity for the site.  A second goal was to monitor when each of the tree species began their first year of flowering.  As of 2007, about 20% of the tree species have begun to flower.  Information on bee-plant relationships, bee diversity, and flowering environment are used to suggest how small constructed wild land gardens can be used to conserve pollinators.