LAKE TAHOE, Calif. — For a species with fewer than 40 individuals remaining in the high Sierra, every patch of habitat matters. A federal court ruled Sept. 16 that the U.S. Fish and Wildlife Service violated the Endangered Species Act by declining to designate critical habitat for the Sierra Nevada red fox, a rare alpine carnivore recently documented in the Lake Tahoe Basin for the first time in decades. The court granted summary judgment in fav…