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Author: Katherine Frances Marquez Publisher: ISBN: Category : Languages : en Pages : 104
Book Description
The total land-mass of urban areas is rapidly increasing, forcing wildlife species to respond either by reductions in their distribution and abundance or acclimation to urban and otherwise modified habitats. Coyotes (Canis latrans) are found in the heart of some major cities within their range but relegated to the fringes of others. I examined two urban coyote populations. One population, San Francisco, is relatively new, having become established in patches of habitat within the city only within the last several years, providing a window into the process of colonization. The other, Sacramento, is linear and provides a natural connection between the valley and the foothills. The goal of my research is to investigate genetic connectivity between these two urban coyote populations and surrounding rural populations and to assess the possibility of a single founder pair origin for the San Francisco population. Recent research in provides evidence for natal habitat preference in California coyotes. Using genetic assignment methods, at least four genetic subdivisions, corresponding to bioregions, were found: Great Valley, Cascades/Sierra Nevada/Modoc (hereafter referred to as Sierra Nevada), Northwestern, and Central Western. Coyote DNA from scat and some opportunistically collected blood and tissue samples from our two study sites were genotyped at 14 microsatellite loci. Those genotypes were ran in STRUCTURE along with reference genotypes from previously establish clusters in order to determine assignment. The American River Parkway results indicate both a high level of assignment to the Sierra Nevada cluster and no assignment to the Great Valley cluster. The elevational change along the American River Parkway did not appear to have an effect on the results. When the data were analyzed in STUCTURE with K = 3, most coyotes assigned to a cluster distinct from the Great Valley or Sierra Nevada, which indicates high genetic similarity among the American River Parkway coyotes relative to the surrounding populations. The San Francisco population, having allele counts of greater than four for half of our loci, does not support the single founder pair hypothesis but these counts could have been skewed due to genotyping error. The significant difference between the number of loci with allele counts greater than four in the sample population and the Northwestern reference population provides support for a small founding population. We did not see a strong clustering of the San Francisco genotypes with either the Northwestern or Central Western cluster. The single individual that did assign to the Central Western cluster was from the most southern park sampled, indicating that there is some immigration from the Central Western population. The high relatedness among San Francisco individuals does not support a hypothesis of high immigration from either/or both the Northwestern or Central Western populations. The Central Western displayed high levels of within cluster relatedness, similar to within San Francisco, but Northwestern displayed low levels of relatedness within its cluster. When assessing relatedness among populations we found some error due to probability. This error is evident in relationship levels between the Northwestern cluster and the Central Western cluster, which are geographically isolated from each other. When assessing relationships by park, high relatedness was seen within the Presidio. Among the different parks, the pairs of parks that showed the three highest number of relationships were between Glen Park and each of the other three parks. This shows both evidence of the willingness of coyotes to traverse urban landscapes and the inability of small parks to sustain many individuals. I used noninvasive genetic sampling, which has inherent limitations to for genetic analysis because it yields low quality and quantity DNA. For this reason, genotypic error due to allelic dropout is common. Lack of detection can produce null alleles that may result in false homozygotes. In addition, season/weather, age of feces at collection, and time between preservation and DNA extraction all greatly affect PCR amplification success. Both the American River Parkway and the San Francisco study sites offer insight from a wildlife management perspective. This information can be used, either for the development of corridors and wildlife areas to promote urban wildlife and/or for strategies in managing the population size of current urban coyote populations. Both strategies meet the purpose of limiting the human-wildlife interface within urban areas and thus limiting the opportunity for conflict.
Author: Katherine Frances Marquez Publisher: ISBN: Category : Languages : en Pages : 104
Book Description
The total land-mass of urban areas is rapidly increasing, forcing wildlife species to respond either by reductions in their distribution and abundance or acclimation to urban and otherwise modified habitats. Coyotes (Canis latrans) are found in the heart of some major cities within their range but relegated to the fringes of others. I examined two urban coyote populations. One population, San Francisco, is relatively new, having become established in patches of habitat within the city only within the last several years, providing a window into the process of colonization. The other, Sacramento, is linear and provides a natural connection between the valley and the foothills. The goal of my research is to investigate genetic connectivity between these two urban coyote populations and surrounding rural populations and to assess the possibility of a single founder pair origin for the San Francisco population. Recent research in provides evidence for natal habitat preference in California coyotes. Using genetic assignment methods, at least four genetic subdivisions, corresponding to bioregions, were found: Great Valley, Cascades/Sierra Nevada/Modoc (hereafter referred to as Sierra Nevada), Northwestern, and Central Western. Coyote DNA from scat and some opportunistically collected blood and tissue samples from our two study sites were genotyped at 14 microsatellite loci. Those genotypes were ran in STRUCTURE along with reference genotypes from previously establish clusters in order to determine assignment. The American River Parkway results indicate both a high level of assignment to the Sierra Nevada cluster and no assignment to the Great Valley cluster. The elevational change along the American River Parkway did not appear to have an effect on the results. When the data were analyzed in STUCTURE with K = 3, most coyotes assigned to a cluster distinct from the Great Valley or Sierra Nevada, which indicates high genetic similarity among the American River Parkway coyotes relative to the surrounding populations. The San Francisco population, having allele counts of greater than four for half of our loci, does not support the single founder pair hypothesis but these counts could have been skewed due to genotyping error. The significant difference between the number of loci with allele counts greater than four in the sample population and the Northwestern reference population provides support for a small founding population. We did not see a strong clustering of the San Francisco genotypes with either the Northwestern or Central Western cluster. The single individual that did assign to the Central Western cluster was from the most southern park sampled, indicating that there is some immigration from the Central Western population. The high relatedness among San Francisco individuals does not support a hypothesis of high immigration from either/or both the Northwestern or Central Western populations. The Central Western displayed high levels of within cluster relatedness, similar to within San Francisco, but Northwestern displayed low levels of relatedness within its cluster. When assessing relatedness among populations we found some error due to probability. This error is evident in relationship levels between the Northwestern cluster and the Central Western cluster, which are geographically isolated from each other. When assessing relationships by park, high relatedness was seen within the Presidio. Among the different parks, the pairs of parks that showed the three highest number of relationships were between Glen Park and each of the other three parks. This shows both evidence of the willingness of coyotes to traverse urban landscapes and the inability of small parks to sustain many individuals. I used noninvasive genetic sampling, which has inherent limitations to for genetic analysis because it yields low quality and quantity DNA. For this reason, genotypic error due to allelic dropout is common. Lack of detection can produce null alleles that may result in false homozygotes. In addition, season/weather, age of feces at collection, and time between preservation and DNA extraction all greatly affect PCR amplification success. Both the American River Parkway and the San Francisco study sites offer insight from a wildlife management perspective. This information can be used, either for the development of corridors and wildlife areas to promote urban wildlife and/or for strategies in managing the population size of current urban coyote populations. Both strategies meet the purpose of limiting the human-wildlife interface within urban areas and thus limiting the opportunity for conflict.
Author: Erica Spotswood Publisher: ISBN: 9781950313037 Category : Nature Languages : en Pages : 156
Book Description
Using the framework developed in this report, urban designers and local residents can work together to link local parks, greenways, green roofs, street trees, stormwater basins, commercial landscaping, and backyards to support biodiversity while making cities better places to live.
Author: Publisher: ISBN: Category : Biogeography Languages : en Pages : 92
Book Description
This volume represents a first attempt at holistically classifying and mapping ecological regions across all three countries of the North American continent. A common analytical methodology is used to examine North American ecology at multiple scales, from large continental ecosystems to subdivisions of these that correlate more detailed physical and biological settings with human activities on two levels of successively smaller units. The volume begins with an overview of North America from an ecological perspective, concepts of ecological regionalization. This is followed by descriptions of the 15 broad ecological regions, including information on physical and biological setting and human activities. The final section presents case studies in applications of the ecological characterization methodology to environmental issues. The appendix includes a list of common and scientific names of selected species characteristic of the ecological regions.
Author: Erica Spotswood Publisher: ISBN: 9780998924434 Category : Languages : en Pages :
Book Description
In this report, we investigate how re-integrating components of oak woodlands into developed landscapes -- "re-oaking" -- can provide an array of valuable functions for both wildlife and people. Re-oaking can increase the biodiversity and ecological resilience of urban ecosystems, improve critical urban forest functions such as shade and carbon storage, and enhance the capacity of cities to adapt to a changing climate. We focus on Silicon Valley, where oak woodland replacement by agriculture and urbanization tells a story that has occurred in many other cities in California. We highlight how the history and ecology of the Silicon Valley landscape can be used as a guide to plan more ecologically-resilient cities in the Bay Area, within the region and elsewhere in California. We see re-oaking as part of, and not a substitute for, the important and broader oak woodland conservation efforts taking place throughout the state.
Author: Xavier Bonnefoy Publisher: World Health Organization ISBN: 9289071885 Category : Medical Languages : en Pages : 293
Book Description
The second half of the 20th century and the beginning of the 21st century witnessed important changes in ecology, climate and human behaviour that favoured the development of urban pests. Most alarmingly, urban planners now face the dramatic expansion of urban sprawl, in which city suburbs are growing into the natural habitats of ticks, rodents and other pests. Also, many city managers now erroneously assume that pest-borne diseases are relics of the past. All these changes make timely a new analysis of the direct and indirect effects of present-day urban pests on health. Such an analysis should lead to the development of strategies to manage them and reduce the risk of exposure. To this end, WHO invited international experts in various fields - pests, pest-related diseases and pest management - to provide evidence on which to base policies. These experts identified the public health risk posed by various pests and appropriate measures to prevent and control them. This book presents their conclusions and formulates policy options for all levels of decision-making to manage pests and pest-related diseases in the future. [Ed.]
Author: Richard T. T. Forman Publisher: Cambridge University Press ISBN: 1107199131 Category : Nature Languages : en Pages : 637
Book Description
A pioneering book highlighting the dynamic environmental dimensions of towns and villages and spatial connections with surrounding land.
Author: Sean Baumgarten Publisher: ISBN: 9781950313075 Category : Science Languages : en Pages : 280
Book Description
The Peninsula Watershed has been integral to the story of San Francisco's growth ever since the Gold Rush. The rapid influx of settlers to San Francisco during the Gold Rush spurred a sudden demand for a reliable water source, which led to the formation of the Spring Valley Water Works (later purchased by the Spring Valley Water Company [SVWC]) in 1858 (Hanson 2005 ). Over the subsequent 70 years, SVWC bought up large swaths of land on the Peninsula, and constructed a complex system of dams, tunnels, and pipes to capture and transport water to San Francisco. Within the Peninsula Watershed, this system includes the Crystal Springs and San Andreas reservoirs, located in the San Andreas Creek, Laguna Creek, and Upper San Mateo Creek basins along the San Andreas Fau The City of San Francisco purchased SVWC in 1930, and today the Peninsula Watershed, managed by the San Francisco Public Utilities Commission (SFPUC), continues to be a key source of water for San Francisco and for other communities in the South and East Bay. Despite the past 150 years of reservoir construction and other hydrologic modifications, the construction of transportation and utility corridors, and the large-scale suburban development that has occurred to the east, the Peninsula Watershed has remained largely undeveloped and is managed to protect water quality, water supply, wildlife habitat, and a range of other natural and cultural resources. The watershed supports some of the largest intact remnants of contiguous habitat in the region, including extensive oak woodlands, old-growth Douglas-fir forests, serpentine grasslands, chaparral, and coastal scrub. Over the past 250 years since Spanish explorers first set foot on the watershed, however, changes in disturbance regimes and other large-scale anthropogenic modifications, including fire suppression, homesteading, livestock grazing, agriculture, tree planting, introduction of plant pathogens, spread of invasive species, and climate change, have altered vegetation dynamics and changed the distribution and structure of vegetation communities throughout the watershed. The changes have raised many questions about the historical ecology of the watershed: What was the extent, distribution, and composition of terrestrial, riparian, and wetland habitats prior to Euro-American modification? How have vegetation distributions changed over the past two centuries, and what are the implications of those changes for species support? Are there remnant patches of relatively unmodified habitat present in the watershed, or areas that are currently in a state of recovery? Where are current habitat characteristics most similar to or different from historically documented conditions? How have key natural and anthropogenic disturbance regimes and processes changed over time? The Peninsula Watershed Historical Ecology Study aims to advance understanding of landscape conditions of the Peninsula Watershed prior to major Euro-American modification, and to provide insights into the nature and drivers of vegetation change since the first Spanish explorers set foot in the watershed 250 years ago. The primary goal of the research was to examine the historical extent, distribution, and composition of terrestrial vegetation types and their trajectories of change within the watershed. To the extent possible, research also addressed historical riparian, wetland, and estuarine habitats; hydrology and sediment dynamics; wildlife support; land use history; and a range of other topics.
Author: Robert A. Long Publisher: Island Press ISBN: 1610911393 Category : Nature Languages : en Pages : 399
Book Description
The status of many carnivore populations is of growing concern to scientists and conservationists, making the need for data pertaining to carnivore distribution, abundance, and habitat use ever more pressing. Recent developments in “noninvasive” research techniques—those that minimize disturbance to the animal being studied—have resulted in a greatly expanded toolbox for the wildlife practitioner. Presented in a straightforward and readable style, Noninvasive Survey Methods for Carnivores is a comprehensive guide for wildlife researchers who seek to conduct carnivore surveys using the most up-to-date scientific approaches. Twenty-five experts from throughout North America discuss strategies for implementing surveys across a broad range of habitats, providing input on survey design, sample collection, DNA and endocrine analyses, and data analysis. Photographs from the field, line drawings, and detailed case studies further illustrate on-the-ground application of the survey methods discussed. Coupled with cutting-edge laboratory and statistical techniques, which are also described in the book, noninvasive survey methods are effi cient and effective tools for sampling carnivore populations. Noninvasive Survey Methods for Carnivores allows practitioners to carefully evaluate a diversity of detection methods and to develop protocols specific to their survey objectives, study area, and species of interest. It is an essential resource for anyone interested in the study of carnivores, from scientists engaged in primary research to agencies or organizations requiring carnivore detection data to develop management or conservation plans.
Author: Blake Gumprecht Publisher: JHU Press ISBN: 9780801866425 Category : Architecture Languages : en Pages : 390
Book Description
Winner of the J. B. Jackson Prize from the Association of American Geographers Three centuries ago, the Los Angeles River meandered through marshes and forests of willow and sycamore. Trout spawned in its waters and grizzly bears roamed its shores. The bountiful environment the river helped create supported one of the largest concentrations of Indians in North America. Today, the river is made almost entirely of concrete. Chain-link fence and barbed wire line its course. Shopping carts and trash litter its channel. Little water flows in the river most of the year, and nearly all that does is treated sewage and oily street runoff. On much of its course, the river looks more like a deserted freeway than a river. The river's contemporary image belies its former character and its importance to the development of Southern California. Los Angeles would not exist were it not for the river, and the river was crucial to its growth. Recognizing its past and future potential, a potent movement has developed to revitalize its course. The Los Angeles River offers the first comprehensive account of a river that helped give birth to one of the world's great cities, significantly shaped its history, and promises to play a key role in its future.
Author: Katherine Frances Marquez
Author: Katherine Frances Marquez
Author: Erica Spotswood
Author: Joshua Ross Ginsberg
Author: 
Author: Erica Spotswood
Author: Xavier Bonnefoy
Author: Richard T. T. Forman
Author: Sean Baumgarten
Author: Robert A. Long
Author: Blake Gumprecht