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Sparrows uniquely tailored to Bay Space marshes are dropping their uniqueness

How does lack of habitat have an effect on the animals nonetheless residing there? A genetic examine of saltwater-adapted Savannah sparrows across the San Francisco Bay Space exhibits that the 90% lack of tidal marsh habitat has led to extra interbreeding with freshwater-adapted Savannah sparrows, diminishing their genetic adaptation to saltwater, reminiscent of enlarged kidneys and bigger beak. This might reduce their capability to reside in a saltwater habitat.