Download or read book Effects of Habitat Fragmentation on Reptiles and Amphibians in Coastal Sage Scrub and Grassland Communities written by Gary Toshihiko Busteed and published by . This book was released on 2003 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Habitat Distrubances on Reptiles in Sagebrush Steppe written by Kristina Joan Parker and published by . This book was released on 2021 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Reptiles inhabiting shrub-steppe ecosystems of the Intermountain West have adapted to harsh, unpredictable desert conditions, yet recent changes in disturbance regimes may put species at risk. In southwest Idaho, cheatgrass (Bromus tectorum) has altered the fire regime resulting in a vast conversion of shrub-steppe to mostly annual grasslands that burn too frequently to allow shrublands to recover. Southwest Idaho has the highest reptile diversity in the Pacific Northwest, yet we know little about reptile community dynamics in response to the cheatgrass-fire cycle. We hypothesized that wildfires and cheatgrass negatively affect reptile communities directly (i.e., mortality during fires) and indirectly through changes in the quality of reptile habitats at multiple spatial scales. We used trapping and visual encounter survey data to quantify the effect of previous wildfires, cheatgrass, and other habitat metrics on reptile richness, diversity, occupancy, and abundance at local (i.e., trapping array) and landscape levels. We found that vegetation cover, distance to a rock outcrop, and wildfire frequency were essential predictors c reptile abundance at both spatial scales. We found that many reptile species were not affected by cheatgrass cover but were affected by wildfire frequency. Lizard richness decreased with the number of times an area immediately around a trapping array burned. Our models indicated that occupancy for many reptile species declined in areas that burned, especially in areas with repeated burns at the local level. We found that only gophersnake abundance was significantly negatively affected by wildfire at the local level. Our research contributes to the growing body of evidence that the cheatgrass-fire cycle in the western U.S. negatively impacts many species, including reptiles. However, the effect on communities is nuanced, with winners and losers depending on a combination of habitat associations, life history, and environmental sensitivities."--Boise State University ScholarWorks.

Download or read book Eastern Transportation Corridor ETC SR 231 Between SR 91 and South of I 5 at SR 133 Orange County Supplemental EIS written by and published by . This book was released on 1994 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Santa Ana River Flood Control Project Auxiliary Dike and Floodwall written by and published by . This book was released on 2010 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Complex Effects of Habitat Fragmentation on the Quantity and Quality of Pollination Services Within a Coastal Sage Scrub Plant Community written by Adrienne Lee and published by . This book was released on 2016 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Habitat fragmentation due to human activity has led to pollinator declines worldwide, yet little is known about how this diversity loss affects pollination services in natural ecosystems. In this study, we investigate the mechanistic links between habitat fragmentation, a proxy for pollinator diversity loss, and the quantity (conspecific pollen deposition) and quality (heterospecific pollen proportion) of pollination services in coastal sage scrub habitats in the San Diego region. We documented pollinator visitation and pollen deposition across ten focal plant species in six natural reserve and six scrub fragment plots. At the level of the community as a whole, habitat fragmentation per se was not a significant driver of conspecific pollen deposition nor was it a significant driver of heterospecific pollen proportion. However, habitat type (reserves vs. fragments) formed statistically significant interactions with other variables in both conspecific and heterospecific proportion models, suggesting that fragmentation can indirectly affect pollination services. The western honeybee, Apis mellifera, was the most numerically dominant floral visitor across all study plots. Due to its high abundance, A. mellifera could influence both conspecific pollen deposition and heterospecific pollen proportion among reserve and fragment plots, potentially altering pollination services within coastal sage scrub habitats. Overall, habitat fragmentation can impart complex effects within plant-pollinator networks, as habitat type was shown to affect plant species differently with regards to changing pollinator variables. These differences in responses from plant species and pollinators could potentially result in a restructuring of plant-pollinator networks.

Download or read book Tehachapi Renewable Transmission Project TRTP written by and published by . This book was released on 2010 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Habitat Fragmentation on Native and Exotic Plants in Southern California Coastal Scrub written by and published by . This book was released on 1993 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Point Arguella Field and Gaviota Processing Facility Area Study written by and published by . This book was released on 1984 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Habitat Fragmentation on Vertebrate Diversity in Southern California Grasslands written by Ruben E. Murcia and published by . This book was released on 1996 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Angeles National Forest N F Antelope Pardee 500 kV Transmission Project written by and published by . This book was released on 2007 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Habitat Fragmentation in Great Basin Sagebrush bunchgrass Communities for Small Mammals and Arthropods written by Sheryl L. Bateman and published by . This book was released on 1999 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Suburban Proximity on Arthropods and Plants in Californian Coastal Sage Scrub written by Shannon M. Kirshtner and published by . This book was released on 2007 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Habitat Fragmentation and the Structure of Community and Population Diversity written by George R. Robinson and published by . This book was released on 1989 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seasonal Priority Effects written by Claire Elizabeth Wainwright and published by . This book was released on 2011 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exotic annual grasses are invading native plant communities in many areas including the western United States, and pose a significant challenge to habitat restoration. Observations in California grasslands suggest that exotic species may become active earlier in the growing season than native species, and that this distinct phenology may contribute to invasion success. We hypothesized that flexible germination cues may allow exotic annual grasses to start annual growth early each growing season and preempt resources prior to native seedling establishment, a kind of seasonal priority effect. Flexible germination cues could incur a cost, however, if they cause seeds to germinate before the onset of favorable growing conditions. To evaluate these predictions, we compared native and exotic species performance in a coastal sage scrub community under both early (off-season) and ambient (natural) rainfall timings. Exotic annual grasses germinated substantially with off-season watering, but none of the early seedlings survived until the onset of the natural rains. Exotic annual grasses that experienced off-season watering had a depleted seedbank and lower germination following the natural rains. In contrast, native species did not germinate following the off-season watering pulse, and instead emerged with the beginning of the cold natural rains. Our results suggest that phenology is an important factor influencing invasion success and invader impact. Under some conditions, pre-growing season watering could be an important restoration strategy for native plant communities in early stages of invasion by depleting the exotic seedbank and allowing for native species to establish with reduced competition.

Download or read book Habitat Management Guidelines for Amphibians and Reptiles of the Northeastern United States written by Joseph C. Mitchell and published by . This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Habitat Fragmentation on Herpetofauna in the Central Piedmont of North and South Carolina written by Angelique Archer Rudert and published by . This book was released on 2005 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wildland Fire in Ecosystems written by and published by . This book was released on 2000 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: