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Anthropogenic Disturbance Regimes And Coastal Sage Scrub Recovery
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Book Synopsis Anthropogenic Disturbance Regimes and Coastal Sage Scrub Recovery by : Kyra R. Engelberg
Download or read book Anthropogenic Disturbance Regimes and Coastal Sage Scrub Recovery written by Kyra R. Engelberg and published by . This book was released on 2011 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Coastal sage scrub (CSS) is a unique and highly threatened vegetation community in coastal Southern California and northern Mexico, with 90 percent lost to development, agriculture, and invasive species. Understanding CSS recovery is critical to its survival. This study looks at the long-term effects of grazing and cultivation in southern California by tracking the extent of exotic grassland in two valleys in the Santa Monica Mountains over sixty years. The rates of native shrub return in a grazed valley were compared to those in a cultivated valley. Transects compared physical differences of stable and recovering grassland-shrubland boundaries. Native shrubs returned to the grass valley that was grazed nearly one and one-half times faster than the valley that was cultivated. Cultivation may result in a type conversion of CSS to a new steady state of exotic annual grassland. The field transects showed that stable and recovering boundaries had different physical characteristics.
Book Synopsis Invasive Species Impacts on Coastal Sage Scrub Recovery by : Emily Griffoul
Download or read book Invasive Species Impacts on Coastal Sage Scrub Recovery written by Emily Griffoul and published by . This book was released on 2017 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant resources are invested in the restoration of degraded Coastal Sage Scrub in Southern California to meet conservation goals. Thus, understanding the resilience of these systems is of great importance given their high value intersection with human settlements. The presence of invasive annual species has been suggested to add complexity to ecological restoration efforts by inhibiting the growth of native species, changing fire regimes, and altering water balance. To further understand these ideas, I utilized a long-term experiment testing the effectiveness of "passive" restoration, the removal of non-native species without expensive site preparation or resource-intensive active planting / seeding of native species, which means that the approach could be designed to have widespread positive effects at potentially minimal costs. I found that passive restoration was successful at meeting restoration goals of increasing native shrub cover. Two ecological mechanisms---the establishment of new individuals on the landscape versus the expansion of plant size of existing shrubs---were likely responsible for the variation in patterns of recovery for localities with different initial native shrub cover. These patterns give insight into how to affect change in communities through management intervention. Better formulating a conceptual model of the contemporary dynamics of Coastal Sage Scrub informs decisions on expending limited resources to different intensities of restoration across a complex landscape to maximally impact conservation.
Book Synopsis Mapping the Historical Dynamics of Coastal Sage Scrub on the Palos Verdes Peninsula by : Michael H. Ferris (Jr.)
Download or read book Mapping the Historical Dynamics of Coastal Sage Scrub on the Palos Verdes Peninsula written by Michael H. Ferris (Jr.) and published by . This book was released on 2012 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: California sage scrub (CSS) and adjacent vegetation communities have experienced significant declines due to numerous anthropogenic disturbances. A number of areas have been set aside on the Palos Verdes Peninsula to preserve open spaces and protect at-risk species. An analysis of the vegetation dynamics in the Portuguese Bend area of the Peninsula was performed using historical aerial imagery and derived land-cover classifications. Image data was classified using an object-based segmentation method combined with a ground-based classification. The land-cover layers were derived for six separate time periods, covering fifty years, and the layers were compared to determine what types of changes had occurred within the study area. The changes observed in this study are discussed using four hypothesized models as recovery determinants. While challenges were encountered due the chaotic nature of disturbance in the area, the aerial photos and land-cover layers provide an invaluable record of change within the Portuguese Bend Reserve.
Book Synopsis Dynamics of Invasion and Native Species Recovery Following Fire in Coastal Sage Scrub by : Scott Charles Gressard
Download or read book Dynamics of Invasion and Native Species Recovery Following Fire in Coastal Sage Scrub written by Scott Charles Gressard and published by . This book was released on 2012 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coastal sage scrub (CSS) is an important vegetation type in Southern California, which is under threat from multiple environmental changes such as nitrogen deposition, invasion by exotic species, and accelerating fire regimes. While previous studies have found that CSS can recover pre-fire cover through a successional process, there is concern that high exotic annual grass abundance after fire could prevent native shrub recovery, creating an alternate stable state which requires an active management for restoration of native shrub cover. This study evaluated the performance of focal native and exotic species at early demographic stages (germination, first-year growth and survival) in one recently burned site, and then placed these short-term results in context by examining long-term vegetation dynamics across four CSS sites in San Diego County. Exotic species out-performed native species during all early demographic stages, especially following fire. In the long-term (20 years) cover by native CSS shrubs returned to pre-fire levels at three of the four sites monitored. These results indicate that invasion slows the rate of CSS successional recovery post-fire, and that native CSS vegetation can recover given a long-enough fire return interval. Accelerating fire frequencies, however, may be creating invaded "apparent stable states," because full native shrub recovery does not effectively occur between closely spaced fires.
Book Synopsis Terrestrial Vegetation of California, 3rd Edition by : Michael Barbour
Download or read book Terrestrial Vegetation of California, 3rd Edition written by Michael Barbour and published by Univ of California Press. This book was released on 2007-07-17 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thoroughly revised, entirely rewritten edition of what is the essential reference on California’s diverse and ever-changing vegetation now brings readers the most authoritative, state-of-the-art view of California’s plant ecosystems available. Integrating decades of research, leading community ecologists and field botanists describe and classify California’s vegetation types, identify environmental factors that determine the distribution of vegetation types, analyze the role of disturbance regimes in vegetation dynamics, chronicle change due to human activities, identify conservation issues, describe restoration strategies, and prioritize directions for new research. Several new chapters address statewide issues such as the historic appearance and impact of introduced and invasive plants, the soils of California, and more.
Book Synopsis Postfire Recovery of California Coastal Sage Scrub by : J. E. Keeley
Download or read book Postfire Recovery of California Coastal Sage Scrub written by J. E. Keeley and published by . This book was released on 1984 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecosystems of California by : Harold Mooney
Download or read book Ecosystems of California written by Harold Mooney and published by Univ of California Press. This book was released on 2016-01-19 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt: This long-anticipated reference and sourcebook for CaliforniaÕs remarkable ecological abundance provides an integrated assessment of each major ecosystem typeÑits distribution, structure, function, and management. A comprehensive synthesis of our knowledge about this biologically diverse state, Ecosystems of California covers the state from oceans to mountaintops using multiple lenses: past and present, flora and fauna, aquatic and terrestrial, natural and managed. Each chapter evaluates natural processes for a specific ecosystem, describes drivers of change, and discusses how that ecosystem may be altered in the future. This book also explores the drivers of CaliforniaÕs ecological patterns and the history of the stateÕs various ecosystems, outlining how the challenges of climate change and invasive species and opportunities for regulation and stewardship could potentially affect the stateÕs ecosystems. The text explicitly incorporates both human impacts and conservation and restoration efforts and shows how ecosystems support human well-being. Edited by two esteemed ecosystem ecologists and with overviews by leading experts on each ecosystem, this definitive work will be indispensable for natural resource management and conservation professionals as well as for undergraduate or graduate students of CaliforniaÕs environment and curious naturalists.
Book Synopsis Postfire Dynamics in Californian Coastal Sage Scrub by : Marlyce Ann Myers
Download or read book Postfire Dynamics in Californian Coastal Sage Scrub written by Marlyce Ann Myers and published by . This book was released on 1984 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Use of Terrestrial Arthropods to Evaluate Coastal Sage Scrub Restoration by : Wendy Dunbarr
Download or read book Use of Terrestrial Arthropods to Evaluate Coastal Sage Scrub Restoration written by Wendy Dunbarr and published by . This book was released on 2016 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-native invasive plants threaten native plants in ecosystems through competition for resources, alteration to ecosystem functions and disturbance regimes, and changes to food webs and mutualistic relationships. Decades of intense disturbance and fragmentation of coastal sage scrub in Southern California have led to type conversion from mixed native shrub cover to non-native annual grassland in many places. Restoration efforts have been carried out by various government and private land managers in an effort to preserve existing coastal sage scrub and create additional habitat. Ecological restoration typically focuses on vegetation for both restoration activities and assessments of project outcomes. Additional measures of ecosystem function should be considered when evaluating the progress of restoration projects. Terrestrial arthropods occupy a wide breadth of niches and provide valuable ecosystem services (seed dispersal, x decomposition, food sources for higher trophic levels). They are also sensitive to subtle, small-scale changes in the environment, which makes them more likely to be restored before larger animals. This study compared terrestrial arthropod assemblages along with vegetation characteristics among three types of sites (invaded, restored, native) to evaluate the success of two coastal sage scrub restoration projects within the Santa Monica Mountains National Recreation Area. Terrestrial arthropod assemblage compositions were successfully restored at both canyons. These results agreed with vegetation results at Cheeseboro Canyon, but contradicted vegetation results at Zuma Canyon. The results of this study indicate that restoration projects at both canyons were successful. The successful restoration of arthropod assemblage compositions despite spatial isolation and vegetative differences of the restored areas supported the Field of Dreams hypothesis that “if you build it, they will come”. The addition of terrestrial arthropod data to the standard practice of vegetation monitoring provided a more thorough evaluation of the status of these restoration projects, and should be used by land managers in the future.
Book Synopsis A Natural History of Coastal Sage Scrub in Southern California by : Robert S. Taylor
Download or read book A Natural History of Coastal Sage Scrub in Southern California written by Robert S. Taylor and published by . This book was released on 2004 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fire Regimes and Ecosystem Properties by :
Download or read book Fire Regimes and Ecosystem Properties written by and published by . This book was released on 1981 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings--Symposium on Cheatgrass Invasion, Shrub Die-off and Other Aspects of Shrub Biology and Management by :
Download or read book Proceedings--Symposium on Cheatgrass Invasion, Shrub Die-off and Other Aspects of Shrub Biology and Management written by and published by . This book was released on 1990 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Technical Report INT. written by and published by . This book was released on 1990 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Ecology of Natural Disturbance and Patch Dynamics by : Steward T.A. Pickett
Download or read book The Ecology of Natural Disturbance and Patch Dynamics written by Steward T.A. Pickett and published by Elsevier. This book was released on 2013-10-22 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecologists are aware of the importance of natural dynamics in ecosystems. Historically, the focus has been on the development in succession of equilibrium communities, which has generated an understanding of the composition and functioning of ecosystems. Recently, many have focused on the processes of disturbances and the evolutionary significance of such events. This shifted emphasis has inspired studies in diverse systems. The phrase "patch dynamics" (Thompson, 1978) describes their common focus. The Ecology of Natural Disturbance and Patch Dynamics brings together the findings and ideas of those studying varied systems, presenting a synthesis of diverse individual contributions.
Book Synopsis Biogeomorphic Responses to Wildfire in Fluvial Ecosystems by : Joan L. Florsheim
Download or read book Biogeomorphic Responses to Wildfire in Fluvial Ecosystems written by Joan L. Florsheim and published by Geological Society of America. This book was released on 2024-05-22 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Disturbance and Invasion in Coastal Sage Scrub by : Genie M. Fleming
Download or read book Disturbance and Invasion in Coastal Sage Scrub written by Genie M. Fleming and published by . This book was released on 2005 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Understanding and Managing Invasive Plants in Wilderness and Other Natural Areas by :
Download or read book Understanding and Managing Invasive Plants in Wilderness and Other Natural Areas written by and published by . This book was released on 2002 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
