Connectivity Strategic Plan: Native Bees of San Diego

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Presentation transcript:

Connectivity Strategic Plan: Native Bees of San Diego K. James Hung, Ph.D. Candidate Section of Ecology, Behavior, and Evolution; Division of Biological Sciences http://www.bentler.us/eastern-washington/animals/insects/bees/sweat-bee-halictus-farinosus.jpg

Let’s start with a campaign by whole foods and the Xerces society

© Whole Foods

Apidae © K. James Hung

Apidae © K. James Hung © K. James Hung

Megachilidae © John Ascher Wikimedia Commons http://www.naturspaziergang.de/Wildbienen/Megachilinae/Chelostoma_rapunculi.htm © John Ascher Wikimedia Commons

Halictidae © Bart Wursten

Andrenidae © Hadel Go

Colletidae © David Genoud

Bees vs. Fragmentation in SD

Diversity Loss in Fragments

Diversity Loss in Fragments – why? Loss of disturbance-intolerant taxa? Wrong configuration of resources? Lack of re-colonization following local extirpation?

Bee Foraging Ranges Figure from Greenleaf et al. 2007 Larger bees can fly farther to forage for food but even smaller bees can travel hundreds of meters Lots of “scatter” and uncertainty in the relationship Results may not reflect actual bee behavior in the field

Data Gaps Corridor?? Dispersal barrier? How do bees species move among urban scrub patches? What constitutes a “corridor” for bees? How much bee diversity is needed to conserve native plants? Corridor?? Dispersal barrier?