Annual Report 1998-1999
 

"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
User’s Affiliations
University Courses
Current Research
Publications
Research Reports

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Stunt Ranch Santa Monica Mountains Reserve
University of California
Los Angeles

Annual Report
1998-1999

milkweed.gif (12991 bytes)

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 Nonac’s 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 reserve’s 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 Stunt’s (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 Ethel’s 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 Reserve’s 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 reserve’s 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 Evolution’s 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 Society’s "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 Health’s 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. Phil’s 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 Felixson’s 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 Carol’s Corner, a column devoted to docent and garden activities, for the MEMBG’s 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 Instructor’s 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)

bullet_or.gif (886 bytes) Philip W. Rundel and Rasoul Sharifi
UCLA
Long term gas exchange and water relations study of a chaparral plant community
1998-2000

bullet_or.gif (886 bytes) Richard F. Ambrose, Antony R. Orme, and others *
UCLA
Lower Malibu Creek and Malibu Lagoon resource enhancement and management project
August 1997 – June 2000

bullet_or.gif (886 bytes) Jeff Thomas (Advisor – Peter Nonacs)
UCLA
Signal variation and categorization by wrentits (chamaea fasciata)
January, 1998 – June 2000

bullet_or.gif (886 bytes) 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

bullet_or.gif (886 bytes) Maria Diuk (Advisor – Peter Nonacs)
UCLA
Social behavior and learning in the California scrub jay
June 1998- December 1998

bullet_or.gif (886 bytes) Craig M. Fiehler (Advisor – Peter Nonacs)
UCLA
The effects of resource density on territorial behavior in wintering wrentits (chamaea fasciata)
October 1998- March 1999

bullet_or.gif (886 bytes) Stewart B. Peck
Carleton University, Ottawa, Ontario, Canada
Diversity of winter-active leiodid beetles in southern California
January 1- Jauary 15 1999

bullet_or.gif (886 bytes) Charles A. Knight (Advisor – David Ackerly)
Stanford University
Comparative ecophysiology of heat shock protein expression in plants
July 1998-July 2000
Stanford University Grant

bullet_or.gif (886 bytes) 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.

  1. Group size and nest survivorship of Polistes fuscatus and Polistes apachus colonies.
  2. 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 colony’s 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: Ambrose’s 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. Rundel’s responsibilities included mapping the vegetation of the lower Malibu Creek (including invasive species).

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