If you lookup the Arrowhead Marsh alongside the Oakland shoreline on Google Maps, the arrowhead form is placing. If you look nearer, you see that the jap half of the marsh is noticeably darker in colour than the western half; there appears to be an imaginary line bisecting the marsh, and there may as nicely be.
In the Seventies, the Army Corps of Engineers launched a species of Atlantic cordgrass from the East Coast, known as Spartina Alterniflora, to the Alameda shoreline. The East Coast Spartina interbred with the native species of Pacific cordgrass, Spartina foliosa, spawning the hybrid Spartina alterniflora x foliosa.
The hybrid species – and its additional hybridized types — reproduced at a a lot sooner price than the native Spartina foliosa and within the ensuing many years unfold throughout Bay Area marshes, together with Arrowhead. As it unfold, the non-native Spartina drastically altered tidal marshes to the detriment of the wildlife they assist. It grew throughout once-open mudflats, that are essential foraging habitat for shorebirds. It edged out Spartina foliosa and different native vegetation like pickleweed, that are essential for the endangered salt marsh harvest mouse.
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