Outline of Quino Recovery Plan - The Xerces Society

ovata), fiddleneck (Amsinckia spp.), and phacelia (Phacelia spp.) has also been
observed. Dwarf plantain (Plantago erecta) is the primary hostplant in this
region.
Northwest Riverside Recovery Unit:
The Recovery Unit is located south of Lake Mathews, East of Interstate 15, and
west of Interstate 215 as mapped (Figure 4). It contains one habitat complex,
Gavilan Hills, distributed from the south margin of Lake Mathews into the
Gavilan Hills (Figure 2). The closest other Recovery Units are the adjacent
Southwest Riverside Recovery Unit to the south, and the proposed North Orange
Recovery Unit to the north west. Landscape connectivity may be restorable
from the Gavilan Hills to the Southwest Riverside Recovery Unit border,
although dispersal is currently constrained by Interstate 215.
Threats: High; primarily habitat destruction and fragmentation due to
development, and habitat degradation due to nonnative plant invasion.
Southwest Riverside Recovery Unit:
This Recovery Unit is located in southwestern Riverside County east of
Interstate 15 and Interstate 215, north of the east-west oriented section of State
Route 79, south of the Santa Fe Railroad line and Scott road (south of State
Route 74), and west of Sage Road and Oak Mountain areas as mapped (Figure
5). It contains two habitat complexes, Warm Springs Creek and
Skinner/Johnson, divided by State Route 79 (Figure 2). State Route 79 is
probably a significant mortality sink, but not currently an impassable barrier
between remaining habitat patches on either side. This Recovery Unit is
generally contiguous with the South Riverside Recovery Unit to the east.
Potential landscape and ecological connections with the Northwest Riverside
Recovery Unit are constrained primarily by Interstate 215 and associated
development.
Threats: High; primarily habitat destruction, degradation, and fragmentation
associated with development outside of Southwest Riverside County Multiple
Species Reserve. Within Southwest Riverside County Multiple Species Reserve,
nonnative plant species invasion poses the greatest threat.
52