ABUNDANCE AND DISTRIBUTION OF SHOREBIRDS IN THE SAN FRANCISCO BAY AREA

Abstract

On 13 comprehensive censuses of the San Francisco–San Pablo Bay estuary and associated wetlands, we counted 325,000–396,000 shorebirds (Charadrii) from mid-August to mid-September (fall) and in November (early winter); 225,000 from late January to February (late winter); and 589,000–932,000 in late April (spring). Twenty-three of the 38 species occurred on all fall, early-winter, and spring counts.