
"How
can anyone begin to understand the dynamics of an ecosystem without having crawled through
it, or watched the flush of new growth following fire, or listened to the hum of insects
and the songs of birds? It is an intricately woven web of life to be seen, heard, and
smelled."
Mildred E. Mathias (1906-1995)
Long time chair of the UC NRS university-wide advisory committee
1998-1999 STUNT
RESERVE ANNUAL REPORT
Highlights
Users Affiliations
University Courses
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Stunt Ranch Santa Monica
Mountains Reserve
University of California
Los Angeles
Annual Report
1998-1999

Milkweed
Asclepias fascicularis
by Lisa Pompelli
Chumash Indians had numerous uses for Milkweed. The
stems provided cordage and basket weaving material, and the sap was made into chewing gum.

Highlights
Change, as the saying goes, is the only constant in the life
of the UCLA Stunt Ranch Santa Monica Mountains Reserve. This last year was a patchwork of
activity that is on-going with many events and projects expected to come to fruition as
the next century begins. Somehow this all seems very fitting and exciting.
Besides our on-going research and educational
activities
.
While we are still working on finalizing designs for the
soon-to-be constructed facilities in our residential and educational zones, we did buy
(with the assistance of the Nonacs lab at UCLA) a spacious new storage shed. For a
reserve with as yet no buildings, this is a great help to our researchers and us.
In this interim facilities design period at Stunt Ranch, Lisa
Pompelli, the reserves nature center design consultant, has taken the lead in
researching and drafting several models of exhibits and displays for our proposed
indoor/outdoor nature center. Even in the model stage, the displays are eye-catching. A
majority of the finished products will be interactive (both technologically and hands-on)
and all will relate important environmental information in ways that are intended to
stimulate and educate community visitors as well as K-12, and university faculty/students.
The Santa Maria Trails and Parks Association has pledged
$50,000 to fund a major portion of exhibits in the reserve nature center. The award, to be
distributed over five years, will help provide the exhibit materials and supplies for the
Stunt Ranch Nature Center.
Thanks to the magic of the internet and the web surfing by Ed
Hall which led him to the Stunt Ranch site, the reserve will be able to display in its
nature center many of Ethel Stunts (the matriarch of the family for which Stunt
Ranch was named) treasured photos, correspondence, and Stunt Ranch surveys among other
items. Ed, now living in Montana, was a Stunt Ranch neighbor as a young lad and his family
was happy to donate these items to the reserve. Perhaps the most special of all the items
are two of Ethels walking sticks
dog hair attached and all. The UCLA Special
Collections Primary Sources Institute has helped in the archival process of protecting
these items using sealed mylar folders, acid free paper, envelopes, file folders, and
storage box. As an adjunct to the preservation of the articles mentioned above, the
reserve, under the guidance of the Oral History Department on campus is in the process of
developing an oral history program. Our intention is to collect stories from those who
knew the Stunt family and are familiar with the early years of the Cold Creek watershed,
to preserve these wonderful memories, and to share them with visitors to the Stunt Ranch
Reserve.
The Cold Creek Docents, an affiliate of the Mountains
Restoration Trust, continue to play an integral role at Stunt Ranch. They coordinate the
award-winning K-12 environmental education program at the reserve and are actively working
with us to develop our undergraduate field internship program. The Docents are assisting
us, along with Tim Bradley from UCI with the help of a grant from Chevron, in producing
teaching guides for the Stunt Ranch Reserve website. The Docents have also been most
generous in leading tours of the Stunt High Trail at various reserve-sponsored classes and
events held at Stunt Ranch.
The undergraduate 199I field internship program is being
coordinated with the Department of Organismic Biology, Ecology, and Evolution. We intend
to expand this program to other departments such as Geology and Anthropology sometime in
the near future. In the fall 99 quarter Phil Rundel, the Stunt Ranch Reserves
faculty director will teach a new class, California Ecosystems, which will use Stunt Ranch
for the focus of a variety of field activities. The class will be an introduction to the
structure, biodiversity, and dynamics of California ecosystems with a focus on the
Southern California coastal region and the Santa Monica Mountains in particular. There
will be weekly fieldtrips or labs. For the new internship programs (that in many cases
will follow this class) students may work on projects like alien species inventories, set
up processed plant collections, literature reviews, bird population surveys, successional
monitoring, establishing permanent photopoints, riparian habitat monitoring, climate data
analysis, etc. We eventually hope to make this data accessible on our website. An added
feature will be a special training with the Cold Creek Docents to learn to lead tours
with the Docents or for special reserve activities.
Last fall Dr. Alexander Glazer, UC NRS director, visited
UCLA. His primary purpose in coming south was to participate as a panelist in a UCLA
Institute of the Environment conference titled, "California Biodiversity Crisis: Loss
of Nature in an Urbanizing World". Dr. Glazer spoke on "What is happening
now?" Phil Rundel spoke about "What do we have now?" And Carol Felixson,
the Stunt Ranch Reserve director of education and community outreach, addressed the topic,
"Preserving biodiversity: individual and collective action". All were joined by
other fine panelists.
The Reserve took an active role, along with the
Institute of the Environment and the Mildred E. Mathias Botanical Garden, in the planning
and coordination of the "Earthday at UCLA, 1999" which took place in the Garden
on campus. A meaningful event under any circumstances, this year's Earthday at UCLA
occurred several days following the massacre at Columbine High School in Colorado. The
overflow gathering of three to 83 year olds were held in rapt attention by, among others,
Gabrielino/Tongva elder Jimmy Castillo, who poignantly and forcefully reminded us that,
"we need the children." Earthday was planned to be entertaining and educational;
it turned out to be healing in the sense of a communal gathering and healing in the sense
of being held in the embrace of nature.
The reserves presence was felt visually in other UCLA
locales. Posters of the UC NRS and the Stunt Ranch Reserve were displayed in the 2nd
annual Department of Organismic Biology, Ecology and Evolutions Research Symposium
held in the Faculty Center. The reserve was one of four exhibits in a show titled
"UCLA Off-Site
Beyond the Beaten Path" held in the Powell Library Rotunda
during the fall quarter. And the reserve has a semi-permanent display in the lobby of the
Life Science Building. The central part of that display will be changed every two months
in order to highlight different aspects of Stunt Ranch.
Articles about the Stunt Ranch Reserve appeared in the
following publications: the Transect (Natural Reserve System), UCLA Today, The
Basics: a newsletter of the Life and Physical Sciences, UCLA College of Letters and
Science. And the AlumNews (UCLA) will publish an article on the reserve in
their November 99 volume.
In late spring, the reserve hosted two memorable events. The
Department of Biology, Ecology, and Evolution (OBEE) held its annual gathering for
faculty, staff, and graduate students and their families at Stunt Ranch in late April. In
addition to Cold Creek Docent led hikes of the Stunt High Trail, the catered event
included the toe-tapping music of Trailer Park McShank, the Anglo American Ensemble
(students from the UCLA Ethnomusicology Department). Less than 10 days later, the reserve
hosted its first UCLA STUDENT DAY. Graduate and undergraduate students, faculty, staff
from OBEE, geography, and anthropology toured the reserve and listened to presentations by
reserve researchers/instructors. The purpose of the day was to serve as an introduction to
the reserve, its current and future instructional use and research projects.
An activity that was in the planning stages during
98-99 will actualize in the 99-2000 school year. In mid-September, UCLA
will sponsor and host the Ninth National Conference of the Society of Environmental
Journalists. The Stunt Ranch Reserve will be one of two sites on the Societys
"Wild Mountains, Urban Woes" tour. Carol Felixson will introduce the journalists
to the Natural Reserve System and Stunt Ranch. Following will be presentations by Dr.
Peter Nonacs, Assistant Professor in the Department of Organismic Biology, Ecology, and
Evolution, and Dr. Janet Thornber, Director of Center X in the Graduate School of
Education & Information Services. The Cold Creek Docents will then lead the visitors
on a hike of the Stunt High Trail. Later in the day, the reserve will be a participant in
a Scientists Poster Session to be held on campus.
Beginning in October 99, the Stunt Ranch Reserve, in
coordination with the Wilderness Outdoor Leadership Foundation (WOLF), will participate in
the UCLA Eco-Heroes program. Eco-Heroes is an affiliate of the Advanced Policy Institute
of the UCLA School of Public Policy and Social Research, whose purpose is to bring Los
Angeles area high school students to wilderness areas for hands-on conservation work
supplemented by on-site environmental education. The reserve will host a different group
of 35 high school students every three months. At Stunt Ranch, the students will help with
exotic species removal, culvert clean-up, trail maintenance and other needed work, and
will receive instruction from select reserve researchers and the Cold Creek Docents.
Use of the reserve remains high. UCLA - 871 user days; other
California colleges 45 user days; others, including K-12 2,750 user days.
From the experience of other reserves with facilities, use at Stunt Ranch is anticipated
to increase dramatically once buildings are re-constructed in the educational and
residential zones at the reserve. The Stunt Ranch Reserve is dedicated to a broad
community environmental education program, and the new buildings will help to facilitate
this use.
PERSONNEL NOTES:
The reserve is proud to announce that Richard Ambrose has
just begun his three-year term as the UCLA representative to the UC Natural Reserve System
system-wide advisory committee. Rich is an associate professor in the UCLA School of
Public Healths Department of Environmental Health Sciences and the director of the
Environmental Science and Engineering program. Phil Rundel held the previous three-year
term. Both Rich and Phil are active members of the UCLA Institute of the Environment.
Besides devoting hours and days of his time as the Stunt
Ranch Reserve faculty director, Phil Rundel is busy teaching classes at UCLA and
conducting his research both locally and worldwide. This year Phil taught Conservation
Biology (OBEE 116), Tropical Ecology (OBEE 154), and a graduate seminar course in plant
ecology. He studied Mediterranean type ecosystems, particularly inter-regional comparisons
between California, Chile, and the Cape Region of South Africa. He worked as a consultant
with the Metropolitan Transit Authority on environmental impacts of the subway corridor
under the Hollywood Hills, and again as a consultant for the World Wildlife Fund (WWF) in
developing conservation priorities for Laos, Cambodia, and Vietnam. Phils studies in
the Mojave Desert focused on the eco-physiology and plant species diversity of desert
plants. Much of this work took place at the Granite Mountains Reserve. He traveled to
northern Chile to study plant adaptation in the high elevation puna community in the Andes
of northern Chile. In South Africa, Phil has been working collaboratively on the ecology
of the winter rainfall succulent Karoo, and co-edited an in-press special issue of Plant
Ecology on this subject. Springer-Verlag just published a book that Phil co-edited, Landscape
Degradation and Biodiversity in Mediterranean-Type Ecosystems.
In addition to Carol Felixsons work as the Stunt Ranch
Reserve director of education and community outreach, she serves as the docent and
communications coordinator for the Mildred E. Mathias Botanical Garden (MEMBG) at UCLA. In
that capacity she writes Carols Corner, a column devoted to docent and garden
activities, for the MEMBGs quarterly newsletter. This past year was a creatively
eclectic one for Carol. She completed her 98 chapbook, To Question and To Name,
and is currently writing poetry for her 99 chapbook. In December, she
concluded an intensive one-year training to become an instructor of traditional Jewish
meditation. And along with playing the djembe (a west African drum) and other percussion
instruments, Carol began ukulele lessons. She particularly enjoys practicing strumming
techniques and cord progressions for calypso and Celtic styles of music.
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1998-1999 User's Affiliation
University of California campuses:
Los Angeles, San Diego
California State University System:
Cal State LA, Cal State Northridge
Other colleges/universities in California:
Stanford University
Other colleges/universities outside California:
Carlton University, Ontario, Canada; New Mexico State University
K-12 system:
see map and list
Federal/state/local governmental agencies:
Los Angeles Unified School District, Las Virgenes Unified School District, Santa Monica
Unified School District,
Environmental/community organizations:
Cold Creek Docents, Santa Monica Mountains Conservancy, Sierra Club, Coalition on the
Environment and Jewish Life, Wilderness Skills Group
Other:
University of California Office of the President
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1998-1999
University-level Instruction
| Course Title |
Institution |
Instructors Name |
Astro 3
General Astronomy |
UCLA |
Art Huffman |
Env M1B
Global Environment |
UCLA |
Keith Stolenbach |
Anthro 115P (undergrad); 215 (grad)
Field Archaeology |
UCLA |
Jeanne Arnold |
OBEE 136
Lab in Ecology, Behavior & Evolution |
UCLA |
Martin Cody |
OBEE C126
Field Behavioral Ecology |
UCLA |
Peter Nonacs |
OBEE 111
Vertebrate Biology |
UCLA |
Don Buth |
OBEE 111
Vertebrate Biology |
UCLA |
Fritz Hertel |
OBEE 113A
Herpetology |
UCLA |
Ken Nagy |
OBEE 199
Individual Student Project |
UCLA |
Phil Rundel |
BIO 695A
Advanced Field Research |
CSUN |
Thomas Valone |
BIO 392E
Plants & Animals of S. Calif |
CSUN |
Jeff Smallwood |
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1998-1999 Research at
Stunt
(lists Principal Investigator Name, Affiliation, Research
Title,
Project Duration, and Funding Source)
Philip W. Rundel and Rasoul Sharifi
UCLA
Long term gas exchange and water relations study of a chaparral plant community
1998-2000
Richard F. Ambrose, Antony R. Orme, and others *
UCLA
Lower Malibu Creek and Malibu Lagoon resource enhancement and management project
August 1997 June 2000
Jeff Thomas (Advisor Peter Nonacs)
UCLA
Signal variation and categorization by wrentits (chamaea fasciata)
January, 1998 June 2000
Aviva Liebert (Advisor Peter Nonacs), recipient of NRS Mildred
E. Mathias Graduate Student Grant
UCLA
Division of labor and reproductive skew among paper wasp foundresses
1998 2001
Maria Diuk (Advisor Peter Nonacs)
UCLA
Social behavior and learning in the California scrub jay
June 1998- December 1998
Craig M. Fiehler (Advisor Peter Nonacs)
UCLA
The effects of resource density on territorial behavior in wintering wrentits
(chamaea fasciata)
October 1998- March 1999
Stewart B. Peck
Carleton University, Ottawa, Ontario, Canada
Diversity of winter-active leiodid beetles in southern California
January 1- Jauary 15 1999
Charles A. Knight (Advisor David Ackerly)
Stanford University
Comparative ecophysiology of heat shock protein expression in plants
July 1998-July 2000
Stanford University Grant
John Gamon
Cal State Los Angeles
Multi-spectral remote sensing of plant productivity
Follow up to 1996 study
* Lower Malibu Creek and Malibu Lagoon resource
enhancement and management project:
Principal Investigators:
 | Richard R. Ambrose, Environmental Science & Engineering
Program |
 | Antony R. Orme, Geography |
Other Investigators:
 | Johannes Feddema, Geography |
 | Charles Gerba (University of Arizona) |
 | Philip Rundel, OBEE |
 | Mel Suffet, Environmental Science & Engineering Program |
 | M.I. Venkatesan, IGPP |
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1998-1999 Publications
Michael Kohn*, Eric C. York, Denise A. Kamradt, Gary
Haught, Raymond M. Sauvajot, Robert K. Wayne, 1999, Estimating population size by
genotyping faeces, Proc.R. Soc.Lond.B, Vol. 266, number 1420, April 1999, pp.649-757
P.W. Rundel, G. Montenegro, F. Jaksic, 1998, Landscape Degradation and
Biodiversity in Mediterranean-Type Ecosystems, Springer Verlag, 447 PP.
Gamradt*, S.C. and L.B. Kats, 1997, Impact of chaparral wildfire induced
sedimentation on oviposition of stream-breeding California newts (Taricha torosa),
Oecologia, Vol. 110, pp.546-549
Kerby*, J.L. and L.B. Kats, 1998, Modified interactions between salamander life
stages caused by wildfire induced sedimentation, Ecology, Vol. 79, pp. 740-745
Anzalone, C.B., L.B. Kats, and M. Gordon, 1998, Effects of solar uv-b on embryonic
development in three species of lower latitude and lower elevation amphibians,
Conservation Biology, Vol. 12, pp. 646-653
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1998-1999 Research
Reports
Diversity of winter-active leiodid beetles in southern
California.
Stewart B. Peck, Biology
Carleton University, Ottawa, Canada K1S5B6.
Rationale: Leiodid beetles are flight active in cool-moist temperate climatic
conditions. In southern California, these occur in the winter months. Very few collections
of leiodids have even been made in southern California. The fauna was suspected of being
much richer than the literature would suggest. As a part of a US-Canada wide review of the
taxonomy and distribution of leiodid beetles, I spent my sabbatical sampling in mountain
and forest sites in southern California. Report: From January to March four trap and
insect sample stations were operated in oak groves at Stunt Ranch. The sampling results
were better and more diverse than expected. Sorting and genus level identification will
take place in fall and winter 1999-2000. A report of the generic diversity found, and how
it relates to the some 25 other sites monitored in southern California, will be available
sometime in 2000.
Stewart B. Peck, Professor of Biology: Department of Biology, Carleton University, ll25
Colonel By Drive, Ottawa, Ontario K1S 5B6 Canada
Office (6l3) 520-2600, ext.3860; FAX (6l3) 520-4497
Division of labor and reproduction in Polistes paper wasps
Aviva Liebert, Department of Organismic Biology, Ecology, & Evolution, University
of California, Los Angeles
Advisor: Peter Nonacs
Funding: Mildred E. Mathias Graduate Student Research Grant
There are two main areas of my ongoing research at Stunt Ranch Reserve.
- Group size and nest survivorship of Polistes fuscatus and Polistes apachus colonies.
- Division of labor and reproduction in Polistes paper wasps.
Using wooden nest boxes, I have been able to monitor many Polistes wasp colonies
at Stunt Ranch, both those naturally initiated in the boxes and those that have been
transplanted from other nearby locations. During the spring of 1999, I videotaped the
wasps on each nest, and censused the nests 3-4 times a week to keep records of changing
group size and mortality, as well as nest size and brood production. Throughout the summer
1999, I will continue to census the remaining nests throughout their colony cycle. With
this data, I will be looking at the survivorship of colonies with different nest-founding
group sizes. The success rate of nests seems to be quite low, with only three of 12
initial nests surviving to produce brood. These nests have either been predated or
abandoned due to the death or disappearance of the foundress. I hope to further
investigate these specific factors which limit the success of a colony, and look at how
the size of the nest-founding group affects the colonys success.
In addition to examining success rates of Polistes nests in the field, I am also
looking at the division of reproduction on nests with more than one founding wasp. I am
interested in relating the division of labor among potential "queens" to the
share of reproduction obtained by each on the nest. On several nests, I videotaped
behavior of the wasps and then collected both the nest and all adult wasps associated with
it. In the lab, I am using microsatellite DNA analysis to determine maternity of the brood
on each nest, and to estimate relatedness among group members. The videotaped behavior
will show the dominance hierarchy on each nest and the time each wasp spent performing
different tasks. With the genetics and behavioral data, I will be able to look for
relationships between the division of reproduction and the division of labor on each nest.
Monitoring of amphibian breeding activity
Lee Kats, Professor of Biology, Natural Science Division, Pepperdine University,
Malibu, California
As we have for the last 9 years my students and I continue to monitor amphibian
breeding activity (Hyla regilla, Hyla cadaverina, Taricha torosa) at Cold Creek (including
part of Stunt Ranch). Our comparisons of Cold Creek to other streams in the Santa Monica
Mountains indicate that Cold Creek is one of the few perennial streams not disturbed by
exotic predators.Thus it is one of the few streams remaining in the mountains that is good
breeding habitat for native stream-breeding amphibians. In addition, my colleague Tom
Vandergon and a graduate student from Cal State Northridge continue to work on the effects
of ultra-violet radiation on amphibian development at Cold Creek.
Estimating population size by genotyping faeces
Michael H. Kohn (1*), Eric C. York (2), Denise A. Kamradt (2), Gar;y Haught (2),
Raymond M. Sauvajot (2), and Robert Wayne (1)
1) Dept. of Organismic Biology, Ecology, and Evolution,University of California, Los
Angeles
2)U.S. National Park Service , Santa Monica Mountains National Recreation Area.
Keywords: Canis latrans, faecal DNA, population size, microsatellite, sex
ratio, mark-racapture.
Running title: Population size estimation using faeces
Population size is a fundamental biological parameter that is difficult to estimate. By
genotyping coyote (Canis latrans) faeces systematically collected in the Santa
Monica Mountains near Los Angeles, California, we exemplify a general, non-invasive method
to census large mammals. Four steps are involved in the estimation. First, presumed coyote
faeces are collected along paths or roadways where coyotes, like most carnivores, often
defaecate and mark territorial boundaries. Second, DNA is extracted from the faeces and
species identity and sex is determined by mitochondrial DNA (mtDNA) and
Y-chromosome typing. Third, hypervariable microsatellite loci are typed from the faeces.
Lastly, rarefaction analysis is used to estimate population size from faecal genotypes.
This method readily provides a point count estimate of population size and sex ratio.
Additionally, we show that home range use, paternity and kinship can be inferred from the
distribution and relatedness patterns of faecal genotypes. Initial sampling of coyote
feces to calibrate molecular techniques was conducted in the Stunt Ranch reserve, UCLA.
However, the area was too small to conduct a population census of coyotes. Therefor, the
collaboration with the National Park Service was initiated to sample a larger area in the
15 square kilometer spanning Simi Hills area, Agoura, California.
The importance of vocal variation to instrasexual and intersexual interactions in
the wrentit (Chamaea fasciata).
Jeffrey F. Thomas, Department of Organismic Biology, Ecology, & Evolution,
University of California, Los Angeles
Advisor: Peter Nonacs
The aim of this project is to 1) evaluate the levels of variation present in the
song repertoire of individual males; and 2) to determine how that variation is used in
interactions. By individually color-banding wrentits at the Stunt Ranch Reserve, I am able
to record songs from those individuals and compare those songs to each other. This
technique can be used to determine the levels of within-song type variation present in the
repertoire of individual males. I will use this information to determine if within-type
song variation is commonly used in the wrentit or if some individuals are more likely to
produce that variation than others.
The second part of the project will examine how the variation present in song is used
in interactions. Preliminary results suggest that some types of variation may be more
important to male-female interactions than to male-male interactions. Both sexes readily
respond to song playback by approaching the playback speaker, but the time to approach and
the distance of the approach may differ from trail to trail.
Long term Gas exchange and water relations study of a chaparral plant community
Rasoul Sharifi and P. W. Rundel, Department of Organismic Biology, Ecology and
Evolution, University of California, Los Angeles
Plant species of the chaparral plant community undergo various structural and
functional adaptations under the influence of the Mediterranean type climate, which is
defined as a two season climate with cool rainy winters and warm rainless summers. Our
study site, Stunt Ranch, in the Santa Monica Mountains, is a mixed community of plant
species with different adaptive strategies, including shrubs with evergreen,
sclerophyllous leaves, soft-leaved, drought-deciduous leaves and both nitrogen-fixing and
non-fixing capabilities. The study species include woody evergreens (Quercus dumosa;
Heteromeles arbutifolia and Arctostaphylos glandulosa) woody deciduous
shrubs, (Fraxinus velutina var. coriacea; Malacothamnus fasciculatus and
Ribes speciosum); semi-woody deciduous shrubs, (Salvia leucophylla; S.
spathacea Venegasia carpesioides and Eriogonum crocatum) and nitrogen
fixing species (Ceanothus spinosus and Rhamnus ilicifolia). We measured
plant midday water potentials, midmorning assimilation and leaf stomatal conductance to
water vapor during May, August and November of 1998 and June of 1999*. The highest water
stress occurred during August of 1998. Moderate plant water potentials were observed
during May and November of 1998, with a minimum water potential of -2.9 MPa in Fraxinus
during May and -2.8 MPa in Ceanothus during November. The lowest water potentials
were reached during August of 1998 in Fraxinus, Eriogonum and Quercus at
-5.3; -5.2 and -5.1 MPa, respectively. During peak water stress in August 1998, the
deciduous species showed significantly lower water potentials than the evergreen species.
Assimilation rates for all species were highest during May and lowest during August,
which was consistent with the associated water potentials. There was a small recovery in
assimilation rates during November. During August there was a 73% decrease in the
assimilation rate of the deciduous shrubs and trees and a 33% decrease in the assimilation
rate of the evergreen species. During May, with a good soil water supply, nitrogen fixing
plants had slightly higher assimilation rates than the non-nitrogen fixing species. Leaf
stomatal conductance to water vapor followed a trend similar to photosynthesis.
* Data for 1999 not analyze
The effects of resource density on territorial behavior in wintering wrentits (Chamaea
fasciata).
Craig M. Fiehler, Department of Organismic Biology, Ecology, &
Evolution,University of California, Los Angeles
Advisor: Peter Nonacs
Testing the hypothesis that wrentits sing more when supplementary food is added to
their territories, I measured the resource densities of each territory before food
addition by taking vegetation samples and counting the numbers of insects in each sample.
Song output was also measured before and after food additions by counting the number of
songs heard in a territory in a 30 minute period. Food addition came in the form of
cracked corn. No positive relationship was found between food addition and singing
behavior of territorial wrentits. Wrentits with higher resource levels sang more than
those on territories with lower resource levels. I conclude that wrentits do adjust their
singing behavior based on resource availability, which does follow from the results of
other experiments.
Dispersal behavior of Western Scrub-Jays (Aphelocoma californica)
Maria Diuk-Wasser,Department of Organismic Biology, Ecology, & Evolution,University
of California, Los Angeles
Advisor: Peter Nonacs
My study of Western Scrub-jays (Aphelocoma californica) is related to their
dispersal behavior. Western Scrub-jays contrast with the congeneric Florida Scrub-jays in
that, in the latter, juveniles delay dispersal and help rear their siblings during one or
more years after they were born. I am interested in studying what factors trigger the
early dispersal of juveniles in the local species of Scrub-jays. To this purpose, I
started looking for nests in order to mark and radio-track the juveniles when they
disperse. I was also planning to perform a feeding experiment to determine if food is an
important factor in their decision to leave their natal territory. Unfortunately, I had to
suspend the study in Stunt Ranch due to the difficulty in finding enough pairs of birds to
study and the sometimes inaccessibility of some areas.
Lower Malibu Creek and Malibu Lagoon resource enhancement and management project
Richard Ambrose, Environmental Science and Engineering Program
Antony R. Orme, Geography
Philip W. Rundel, OBEE
Johannes Feddema, Geography
Mel Suffet, Environmental Science and Engineering Program
M. I. Venkatesan, IGPP
University of California, Los Angeles
Charles Gerba, University of Arizona
Funding: California State Coastal Conservancy
The Malibu Creek watershed is the largest watershed draining into the Santa Monica Bay.
Along with Malibu Lagoon at its terminus, this watershed provides unique and valuable
coastal resources. Not surprisingly, given its proximity to the Los Angeles urban area, it
is also subject to significant anthropogenic influences, including imported freshwater,
nutrients, and urban runoff. Building on previous studies, this project addresses the need
to (1) develop a comprehensive understanding of the physical processes occurring in lower
Malibu Creek and Lagoon, (2) assess enhancement opportunities, and (3) develop strategies
for the long-term management of the lower watershed. The study completed a historical
reconstruction of Lower Malibu Creek and Malibu Lagoon, evaluated the hydrology and
morphodynamics of these features, reviewed the physical requirements of key species in
order to define biological and water quality objectives, mapped the vegetation of the
lower Malibu Creek (including invasive species), evaluated eutrophication by estimating
nutrient inputs from various sources into the Lagoon, and conducted a survey of pathogens
in the Lower Creek and Lagoon. In addition, a wide variety of management alternatives were
evaluated to develop appropriate strategies for managing the lower watershed. Finally,
potential wetland restoration sites in the Lagoon area were identified and evaluated.
Note: Ambroses responsibilities included overall project management and (1)
reviewing the physical requirements of key species, (2) evaluating management
alternatives, and (3) evaluating potential wetland restoration sites in the Lagoon area.
Rundels responsibilities included mapping the vegetation of the lower Malibu Creek
(including invasive species).
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