San Francisco South Bay tidelands and waterway tributaries at low tide. The San Francisco Bay-Delta is literally threatened from all sides: rising sea levels from the ocean, disruptions to sediment supply from upstream, and within the Bay-Delta itself, development and other land use changes have left only a tiny fraction (5%) of marshland untouched. Under climate change, coastal wetlands across the world, like the Bay-Delta, are disappearing. The rivers that feed coastal wetlands sediment which provide habitat for wildlife and form the structure of the ecosystem are transporting about a third less sediment, on average. Less sediment supply contributes to increased erosion of the ecosystem. These delicate ecosystems provide several benefits to humans, such as protecting our shorelines, maintaining water quality, preventing damaging floods, and providing a peaceful place to recreate. In addition, they provide habitat for birds, fish, and other wildlife and play an important role in nutrient cycling, particularly carbon storage. American avocet (Recurvirostra americana) resting in the shallow ponds of South San Francisco Bay … [+] A recent study by scientists at the U.S. Geological Survey used historical streamflow and sediment data to calibrate models in order to predict what will happen to the Bay-Delta under […]

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