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VII. Birds
Pages 57-60

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From page 57...
... reported that green algal mats on the intertidal flats of Drakes Estero affect foraging behavior and success of black-bellied plovers, marbled godwits, and western sandpipers. The black-bellied plovers were attracted to the algal mats and exhibited improved foraging success, probably taking advantage of the increased abundances of gammarid amphipod prey (Press, 2005)
From page 58...
... Bags also, however, act as substrate for attachment and growth of green algae. A testable hypothesis is that shorebirds that can pick surface prey may benefit from enhanced abundances of phytal prey like some amphipods on seasonal green algae associated with oyster bags, whereas pure probers like western sandpipers will not use these phytal invertebrates and suffer displacement by intertidal oyster bags.
From page 59...
... Falcons represent a natural source of disturbance, and along with kayakers and motorboat traffic, all cause roosting or feeding waterbirds and shorebirds to take flight. Studies on "flush distances" in San Francisco Bay for eight species also found in the Drakes Estero suggest an average response distance of 51.5 m (Evans, unpublished)
From page 60...
... Feeding shorebirds do not seem prone to being flushed by normal activities of culturists, but insufficient information exists to know how closely culturists can approach the birds without causing retreat by walking or flying.

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