Flowing through the bottom of the Dawson Los Monos Canyon Reserve is Agua Hedionda Creek, one of the few perennial streams in Southern California, as it winds its way through the San Diego county foothills to the Pacific Ocean. Along the stream banks of the canyon floor grows a lush riparian woodland, which gives way to dense chaparral spreading up the steep north- and south-facing slopes. The wide upper canyon opens out onto old pastures of introduced annual grasses, the result of a century of grazing. Other reserve habitats, some of which were once common throughout Southern California, include coast live oak woodland, inland sage scrub, and a mixed grassland of native bunchgrasses and introduced annuals.
Downstream from the reserve’s western boundary lie the coastal wetlands of the Agua Hedionda Lagoon, which are preserved through state and federal legislation. These neighboring protected lands enable the movement of species between open spaces, which in turn encourages diversity and helps keep the reserve from becoming an isolated natural island in this growing region.
The varied landscape of Los Monos Canyon supports a rich fauna featuring more than 75 species of birds, including several pairs of nesting black-shouldered kites.
Stream bank restoration
Old-growth and postburn chaparral monitored since a 1982 fire
Site visits by university courses in ecology, human biology, and natural history; facilities are expanding to enhance teaching use.
The San Diego Natural History Museum collects plant specimens.
- The effects of floral predation on the pollination biology and reproductive success of Yucca whipplei.
- Parasite diversity of small mammals in fragmented areas.
- Suitability of soils and habitat types for the federally endangered Pacific pocket mouse.
Western San Diego County within the cities of Carlsbad and Vista; 48 km (30 mi.) north of San Diego. Reserve straddles middle reach of Agua Hedionda Creek.
Field station includes a trailer for staging and research, a classroom, and short-stay accommodations for up to four; storage shed; Internet connection and wireless access. Two weather stations offer real-time data accessible over the web.
The reserve bibliography includes citations of journal articles, books, theses, art, and other works published about or based on activities conducted at the reserve.
Aerial and historic photo archive; plant-recovery records from post-fire monitoring since 1982; species lists for vascular plants and vertebrates; reserve-based publications since 1995; preliminary archaeological survey report; extensive data on stream habitat conditions; benthic macroinvertebrate collection from Agua Hedionda Creek.
Reserve manager and academic coordinator on San Diego campus; no personnel on site.
95 hectares (234 acres)
67 to 179 m (220 to 587 ft.)
40 cm (16 in.) per year
9.7 – 24 ºC (49.5 – 75 ºF)
Mean: 17 ºC (62 ºF)
August maximum: 31 ºC (88 ºF)
December minimum: 4 ºC (39 ºF)