Thirteen Plant Taxa from the Northern Channel Islands Recovery Plan

摘要

Current Species Status: The plant species covered in this recovery plan arelisted as endangered except for the threatened Santa Cruz Island dudleya (Dudleya nesiotica) and island rush-rose (Helianthemum greenei). All 13 taxa are endemic to the northern Channel Islands (Anacapa, Santa Cruz, Santa Rosa, and San Miguel) and Santa Catalina Island (island rush-rose only). Habitat Requirements and Limiting Factors: These plants occur in a variety of habitats: coastal terrace, coastal bluff scrub, coastal sage scrub, and chaparral. All 13 plant species and their habitats have been or are currently threatened by one or more of the following: soil loss; historic and continuing habitat alteration by mammals alien to the Channel Islands (pigs, goats, sheep, donkeys, cattle, deer, elk, horses, bison); direct predation by these same alien mammals; habitat alteration by native seabirds; competition with alien plant taxa; and increased vulnerability to extinction due to reduced genetic viability, depressed reproductive vigor, and the chance of extinction from random naturally occurring events because of small numbers of individuals and isolated populations. Recovery Objective: The recovery objective for the endangered species is to reclassify them to threatened and then delist these species.