Based on an September 2020 extract of the California Plant Rescue Database, Santa Barbara Botanic Garden holds 30 accessions of Malacothamnus fasciculatus var. nesioticus in orthodox seed collection. There are as many as 2122 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.
Based on an August 2020 extract of the California Plant Rescue Database, Santa Barbara Botanic Garden has collected 30 seed accessions of Malacothamnus fasciculatus var. nesioticus from 8 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 142 maternal plants
Known from 2 small populations on Santa Cruz Island off the coast of southern California. One consists of only 10 clones (50 individuals); the other of only 3 clones (19 individuals). Threatened by feral pig rooting. Non-native sheep, which drastically altered the island's ecosystems over the course of 150 years, have now been removed from the area. All the northern Channel Islands have suffered profound loss and degradation of their soils and changes in their plant communities due to large numbers of non-native mammals introduced to the islands starting in the early 1800's.
The introduction of alien herbivores more than a century ago has had dramatic negative effects on plant community composition on all of the Channel Islands. These effects include the reduction of native plant cover, density and biomass (USFWS 2000). Inten
Three remaining sites, supporting about 120 individuals, are known from Santa Cruz Island (USFWS 2000).
The genetics of this taxon were studied in 1995 (Swensen et al. 1995)
Morphological variation in the species Malacothamnus fasciculatus was studied by D.L. Benesh, a graduate student at the University of Oklahoma. (Benesh 1999a, 1999b)
Long-term management goals include restoring distribution and range of species for all communities on the Channel Islands by increasing plant cover and frequency while simultaneously reducing nonnative species (USFWS 2000). The Nature Conservancy and the National Park Service have removed sheep from Santa Cruz and are exploring options for removing feral pigs (USFWS 2000).
Recovery criteria set forth by the U.S. Fish and Wildlife Service (2000) include stabilizing existing populations and establishing new ones. Research that would aid in conserving plants from these islands includes understanding reproductive ecology and species interactions as well as determining germination and seedling recruitment requirements.
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