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 1. HOME
 2. Reserves
 3. Elliott Chaparral Reserve


ELLIOTT CHAPARRAL RESERVE

The Elliott Chaparral Reserve, formerly part of the Camp Elliott Military
Reservation, is located adjacent to the Marine Corps Air Station Miramar near
Scripps Ranch, California. It includes a mixture of both coastal and desert
habitats with a wide variety of coastal chaparral and coastal sage scrub.

Expand All


OVERVIEW



 * Administering Campus: University of California, San Diego
 * Established: 1969
 * Location: San Diego County, 16 km (10 mi) northeast of San Diego campus;
   adjacent to Marine Corps Air Station Miramar.
 * Size: 74 ha (183 acres)
 * Elevation Range: 61 to 305 m (200 to 1,000 ft)
 * Latitude: 32° 52' 30" N
 * Longitude: 117° 15' 15" W
 * Average Precipitation: 26 cm (10 in) per year
 * Average Temperatures: Annual high: 22°C (71°F); Annual low: 12°C (53°F);
   Annual mean: 17°C (63°F)
 * Facilities: Field station includes storage container (8 ft x 20 ft.); Weather
   station with real-time data via web.
 * Resources: Reserve-based publications since 1995; herbarium (on campus);
   species lists for birds, herptiles, small mammals, vascular plants.
 * Personnel: Academic coordinator on campus; roaming steward; no personnel on
   site.


HISTORY AND ECOLOGY OF THE ELLIOTT CHAPARRAL RESERVE

Elliott Chaparral Reserve occupies the slopes of an inland mesa and its adjacent
ridge ten miles east of the University of California, San Diego. Bounded north
and south by broad, flat-bottomed valleys and associated arroyos, the reserve is
supports a remarkably diverse mixture of natural coastal and desert habitats.
Together with its neighbors, the University of California Elliott Field Station
and a military base, the reserve provides broad expanse of largely undeveloped,
contiguous land that is becoming rare with rapid suburban growth in the San
Diego region.

The lands that make up Elliott Chaparral Reserve once belonged to Mission San
Diego de Alcalá. When mission lands were confiscated by the Mexican government
in 1846, Rancho Ex-Mission San Diego was granted to Santiago Arguello,
commandante of the San Diego Presidio. The property stretched 20 miles north to
the San Dieguito Valley, 50 miles east to Santa Ysabel, and south to El Rosario
in Baja California. Like the rest of Alta California, the rancho became part of
the United States after the Mexican-American War of 1846-1848.

In the 1890s, newspaper publisher Edward Willis Scripps and his half-sister,
Ellen Browning Scripps, bought a portion of the rancho and named it the Scripps
Miramar Ranch. The Scripps siblings went on to become the founding donors of
Scripps Institution of Oceanography.

In the buildup to World War II, the U.S. Marine Corps commandeered 32,000 acres
of land in the vicinity of Scripps Miramar Ranch. These were designated Camp
Elliott in honor of Major General George F. Elliott, tenth commandant of the
Marine Corps. In 1960, Camp Elliott was decommissioned and divided between Naval
Air Station Miramar and an Atlas Missile test facility.

The University of California acquired approximately 500 acres of former Camp
Elliott land from the military in 1965. UCLA professor and NRS cofounder Mildred
E. Mathias urged the Kearny Mesa site be incorporated into the NRS for its
unique biological resources. Elliott Chaparral Reserve was created from a
portion of this property in 1969. The adjacent military lands, now called Marine
Corps Air Station Miramar, are still used for military training and operational
exercises, but also include rare vernal pools on clay hardpan soils. These are
available for research use through a license agreement with the NRS.

The rolling topography of the Elliott Chaparral Reserve is covered with an
unusual mixture of south coastal chaparral. Stands of nearly pure chamise
(Adenostema fasciculatum) are intermixed with elements of coastal sage scrub and
narrow riparian corridors. Chaparral stands at the reserve are more stunted and
open than in most other southern California locations because the soils are
thin, drain rapidly, and have been leached of nutrients. Such demanding
conditions have helped retain the integrity of the site’s plant communities;
some 83 percent of the vascular plant species recorded at the reserve are
native. Several plant species with restricted distributions, such as inland
scrub oak (Quercus berberidifolia), Whipple’s yucca (Hesperoyucca whipplei),
ashy spikemoss (Selaginella bigelovii), and chaparral lilac (Ceonothus spp.),
plus many fire-following native annuals also can be found here. Approximately
one-third of the reserve supports stands of the non-native Tasmanian blue-gum
(Eucalyptus globulus). Located primarily along the ridgeline, these trees were
planted in the late nineteenth and early twentieth centuries for railroad ties
and other commercial uses.

Large mammals such as mountain lion (Puma concolor), bobcat (Lynx rufus), and
deer (Odocoileus hemionus) remain part of the Elliott Chaparral ecosystem thanks
to the open military lands to the south. Native birds found at the reserve
include the greater roadrunner (Geococcyx californianus) and rufous-crowned
sparrow (Aimophila ruficeps), which are sensitive to habitat fragmentation. The
reserve appears to have a particularly rich native ant fauna, including five
species of harvester ants, and one ant genus yet to be described.

The dense population and aridity of San Diego County makes the reserve
especially vulnerable to fire, as became all too evident in 2003. That October,
during the driest part of the year, a man lost in the nearby Cleveland National
Forest set a fire to signal for help. His blaze ignited a massive firestorm.
Fueled by Santa Ana winds, the Cedar Fire burned for ten days before it was
contained. The largest wildfire recorded in California, the Cedar Fire consumed
280,278 acres, destroyed 2,820 buildings, and killed fifteen people.

Burned areas included ninety-five percent of the Elliott Chaparral Reserve.
Within that the charred and smoking landscape, scientists saw a chance to learn
how the ecosystem responds to fire. Among their discoveries was the fact that
different plant species burn with varying intensity. The blaze killed few
blue-gum eucalyptus; instead, their trunk sprouted shoots with extra vigor.
Native woody species re-established themselves rapidly, spreading from 45
percent surface cover in the first year to 75 percent in the fifth year. Nearly
all of the coastal sage scrub oak (Quercus dumosa) and mission manzanita
(Xylococcus bicolor), whose seeds tend to be killed by fire, simply resprouted.
Plant species that produce abundant dormant seeds, such as Ceanothus, rock rose
(Helianthemum scoparium), and deerweed (Lotus scoparius), reappeared in large
numbers. Chamise shrubs not only re-sprouted from root crowns, but also produced
abundant seedlings. And wildflowers bloomed with spectacular intensity in the
first few years afterward. Native annuals such as California poppies
(Eschscholzia californica) and royal goldfields (Lasthenia coronaria), but also
perennial plants with underground storage organs such as mariposa lilies
(Calochortus spp.) and goldenstars (Bloomeria crocea) flourished in the ashes.
Today, Elliott Chaparral appears much as it did before the burn, a testament to
the resilience of nature.


DESCRIPTION/FACILITIES

The Elliott Chaparral Reserve, formerly part of the Camp Elliott Military
Reservation, is located adjacent to the Marine Corps Air Station Miramar near
Scripps Ranch, California. It includes a mixture of both coastal and desert
habitats with a wide variety of coastal chaparral and coastal sage scrub. To
visit the reserve, an application and reservation(s) must be submitted to the
UCSD Natural Reserve System at least a month in advance. 

More information about visiting the Elliott reserve

The Elliott Reserve is located across several ridges and valleys.  Vehicle
access is served by a paved (but somewhat degraded) road, unpaved roads, and
dirt trails.  If bringing a vehicle, you will need to obtain a dashboard permit
(to identify yourself as a legitimate user, in case the military personnel in
the adjacent area – which is not defined by a fence – become inquisitive.)  When
visiting the Elliott reserve, please keep in mind that these areas are Formerly
Used Defense Sites (FUDS) [PDF] and may contain debris left from military
activity. If any debris is found, please refer to the Environment, Health and
Safety site on how to report objects, and notify the NRS steward.

 

There is a weather station located at the western edge of the reserve for which
data are available at http://www.wrcc.dri.edu/weather/ucel.html. Please let us
know if you cannot access the website or if there appears to be a problem with
the data.

If you wish to make a one-time visit to the reserve to determine its suitability
for your proposed use, please contact the manager to arrange short term access.

Access to the Elliott Reserve is restricted by locked gates, including one
controlled by a finger-print scanning device. After your application is
approved, it will be forwarded for review to the Animal Care Program, who
control the finger-scan access.  

Access is controlled by the UCSD Animal Care Facility.  Therefore, if you are
planning to conduct research on animals that will be captured, please allow time
to process an IACUC review.


WEATHER STATION

Current and historical weather data are available for a point at the western
boundary of the Elliott Chaparral Reserve, in the UCSD Research Reserve: 

https://dendra.science/orgs/ucnrs/status/elliott

 

Climate data are also available for a nearby point to the SW of the Elliott
Chaparral Reserve, in Camp Elliot [sic].

http://www.raws.dri.edu/cgi-bin/rawMAIN.pl?caCCAE


CURRENT RESEARCH


CURRENT RESEARCH

Noa Pinter-Wollman: The effect of nest structure on the behavior of harvester
ant (Messor andrei) colonies (drawer description)

The behavior of an ant colony is self-organized and emerges from the actions of
the workers that comprise it. The interactions among workers regulate colony
activity. Colonies of the harvester ant Messor andrei change their behavior in
response to weather and nest site (Pinter-Wollman et al 2012). This suggests
that nest architecture affects the behavior of the colony through influencing
worker interactions. To test the hypothesis that nest architecture determines
colony behavior i will examine the behavior of Messor andrei ant colonies on
Elliot reserve. Messor andrei ants often move among nest sites. I will examine
colony behavior over time before and after it relocates to a new nest site to
determine whether colony behavior changed immediately before or after the move.
Furthermore, after a colony vacates a nest site i will use plaster to create a
cast of the top part of the nest. Tunnel width and depth may affect how ants
interact with one another. I will measure the number, depth, and width of nest
tunnels to determine whether colony behavior is related to these architectural
features.  Relevant work: Pinter-Wollman N. Gordon D.M. & Holmes S. 2012. Nest
site and weather affect the “personality” of harvester ant colonies. Behavioural
Ecology. doi: 10.1093/beheco/ars066.

Markers: I will use flags or bamboo sticks to mark the location of ant colonies

Soil disturbance: I will use plaster to create castes of vacated ant nests after
the colony has moved from the nest site so that no animals are sacrificed. the
casts will be

Elsa Cleland, Rainfall manipulation experiment

As anthropogenic activities continue to alter environmental conditions,
ecologists are challenged to predict how natural systems will respond. Species
vary in their tolerances to environmental constraints such as drought, as well
as their capacity to compete for limiting nutrients with other species (Tilman
1982). Functional traits integrate these ecological tolerances and strategies
for obtaining resources (Lavoral et al. 1999). This provides a framework for
predicting how species composition is likely to respond to shifting
environmental conditions and resource supplies (Suding et al 2008). In areas
where the range of potentially successful ecological strategies are restricted
by environmental conditions, species are likely to converge on a common set of
functional traits associated with environmental tolerance (e.g. habitat
filtering, Weiher & Keddy). In areas where resources are abundant, competition
among species may become a more important predictor of community composition
than environmental tolerance, hence permitting a broader array of strategies to
co-exist. Further, the concept of limiting similarity predicts that species will
be more likely to co-exist if they use different resources or use limiting
resources at different times, such that the community may diverge in functional
traits. In Southern California, precipitation levels are expected to decline
overall and also become more variable in the coming decades. The proposed
research seeks to better understand the role of precipitation as a habitat
filter, influencing patterns of trait divergence and convergence in a chaparral
community. I hypothesize that with lower levels of precipitation, highly adapted
native chaparral species, will display a convergence in the following traits:
high water use efficiency, low specific leaf area, similar flowering time and
length of flowering and will outperform divergent alien species. I further
expect that as levels of rainfall increase, native species will be unable to
take advantage of the surplus resource (rainfall). As a result, divergent
species with novel traits, such as invasive annual grasses, will be able to
outcompete native species and establish within the community.
Methods

We collect rainfall from slanted acrylic roof tops over plots of intact
chaparral vegetation, and redistribute the rainfall to plots from low to high
quantities. Once per year small biomass harvests will remove above-ground plant
material in each plot (0.25 m2). Each year shallow soil cores will be collected
in each plot to evaluate soil nutrient status. No introductions will be made,
nor will any animals be collected. We have instrumentation in the plots,
including soil moisture sensors.

James Hung: Patterns and Consequences of Native Bee Species Loss in
Mediterranean-Type Ecosystems of Southern California 

Observed pollinator declines worldwide have been shown to correlate with a
decline in the population of associated native plants. The immediate
consequences of pollinator species loss on the reproduction of associated
flowering plants, however, have thus far received little examination.
Preliminary native bee surveys in large natural reserves and small ?Open Space?
fragments have demonstrated that large reserves consistently harbor more native
bee species than do small fragments. Thus, I propose a temporary native plant
introduction experiment in large reserves and small fragments to examine how
differences in native bee species richness affects floral visitation and
subsequent fruit and seed set of focal native plant species. Data collected in
this project will also contribute to ongoing projects to elucidate patterns of
native bee response to habitat fragmentation and to inventory bee species
richness in San Diego County.

Methods
I will temporarily bring in native plants, in their pots, to examine pollinator
visitation. Upon senescence of the flowers, all plants will be transported back
to the laboratory (thus no seeds or other plant parts will be left in the
reserves).

USGS – Fisher/Clark group: Effects of fire on ground-dwelling vertebrate and
invertebrate communities in San Diego County


DIRECTIONS

From Interstate 5-S:

 

 1. Head east on Highway 56
 2. Go south on I-15 and follow directions below

From Interstate 5-N:

 1. Head east on Highway 52
 2. Go north on I-15 and follow directions below.

Detailed Directions:

From Interstate 15, exit east on Pomerado Road. Take the second right, where a
gate and UC San Diego Elliott Field Station sign are visible. The first locked
gate at the reserve entrance is a Palm Scan Gate. With the manager's approval
(via online application) you must have your hand scanned for access on the UCSD
campus prior to arriving. At the middle gate, the NRS combination lock and chain
should be carefully replaced in the sequence where found. Do NOT tighten the
chain more than necessary to lock it. To leave the main paved road, a high
clearance, four-wheel drive is necessary.


VIDEOS

  

 


MAPS

 

Elliot Chaparral Reserve Contour Map

Elliot Chaparral Reserve Zone Map


USEFUL LINKS

 * Desert Research Institute at the Western Regional Climate Center:
   http://www.wrcc.dri.edu 
   * Information on their extensive programs. The NRS reserves supported by DRI
     can be found on the list at http://www.wrcc.dri.edu/weather/ 
 * Marine Corps Air Station Miramar: http://www.miramar.usmc.mil/index.html 

Expand All


RESERVES

 * Visit a Reserve
 * Dawson Los Monos Canyon Reserve
 * Elliott Chaparral Reserve
 * Kendall Frost Reserve
 * Scripps Coastal Reserve

Resources

 * Get Involved
 * Publications
 * Report a problem at Elliott Chaparral Reserve
 * Species List
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