Exploring Mitigation Options to Reduce Vehicle-Caused Mortality for the Oregon Silverspot Butterfly, Speyeria Zerene Hippolyta, Along Highway 101 at the Siuslaw National Forest PDF Download
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Category : Conservation biology
Languages : en
Pages : 85
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Book Description
The Oregon Silverspot Butterfly (OSB), Speyeria zerene hippolyta, is federally listed as "threatened." It historically inhabited coastal regions of Washington, Oregon, and California (USFWS 2001). OSB populations only remain at five sites, four of which are in Oregon. The site selected for this study was Rock Creek-Big Creek, adjacent to the Siuslaw National Forest. At this site OSB habitat is bisected by Highway 101; butterflies are observed to use both sides of the highway throughout their life cycle (P. Hammond, personal communication, June 12, 2009). It is suspected that vehicles on Highway 101, through collisions and their turbulence, present a substantial threat to OSBs at this site. This suspicion, however, has not yet been quantified and is only minimally evaluated in this paper. Effective mitigation techniques have rarely been developed and tested for small or flying organisms. Therefore, we explored whether gathering targeted ecological data would help prioritize mitigation options for a threatened species. We studied OSB ecology in order to evaluate the likely success of mitigation options before funding was pursued for implementing or directly testing any of them. In this research, we considered four potential management options that seemed most likely to be effective based on available information, including barrier installation; earthen berm removal and other actions to reduce the attractiveness of the road relative to the surrounding habitat; environmentally triggered, flashing speed-reduction-sign installation; and vegetation manipulation. Again, because these management scenarios are not yet in play, we could not directly test them. Rather, we gathered data on the behavioral ecology of OSBs and the environmental conditions of the road compared to surrounding habitat to determine which mitigation measures would have the greatest potential for effectiveness. In this research, we considered four potential management options that seemed most likely to be effective based on available information, including barrier installation; earthen berm removal and other actions to reduce the attractiveness of the road relative to the surrounding habitat; environmentally triggered, flashing speed-reduction-sign installation; and vegetation manipulation. Again, because these management scenarios are not yet in play, we could not directly test them. Rather, we gathered data on the behavioral ecology of OSBs and the environmental conditions of the road compared to surrounding habitat to determine which mitigation measures would have the greatest potential for effectiveness. To inform mitigation options we examined six questions about environmental conditions across habitats or microhabitats and how these correlated with OSB presence.
Author:
Publisher:
ISBN:
Category : Conservation biology
Languages : en
Pages : 85
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Book Description
The Oregon Silverspot Butterfly (OSB), Speyeria zerene hippolyta, is federally listed as "threatened." It historically inhabited coastal regions of Washington, Oregon, and California (USFWS 2001). OSB populations only remain at five sites, four of which are in Oregon. The site selected for this study was Rock Creek-Big Creek, adjacent to the Siuslaw National Forest. At this site OSB habitat is bisected by Highway 101; butterflies are observed to use both sides of the highway throughout their life cycle (P. Hammond, personal communication, June 12, 2009). It is suspected that vehicles on Highway 101, through collisions and their turbulence, present a substantial threat to OSBs at this site. This suspicion, however, has not yet been quantified and is only minimally evaluated in this paper. Effective mitigation techniques have rarely been developed and tested for small or flying organisms. Therefore, we explored whether gathering targeted ecological data would help prioritize mitigation options for a threatened species. We studied OSB ecology in order to evaluate the likely success of mitigation options before funding was pursued for implementing or directly testing any of them. In this research, we considered four potential management options that seemed most likely to be effective based on available information, including barrier installation; earthen berm removal and other actions to reduce the attractiveness of the road relative to the surrounding habitat; environmentally triggered, flashing speed-reduction-sign installation; and vegetation manipulation. Again, because these management scenarios are not yet in play, we could not directly test them. Rather, we gathered data on the behavioral ecology of OSBs and the environmental conditions of the road compared to surrounding habitat to determine which mitigation measures would have the greatest potential for effectiveness. In this research, we considered four potential management options that seemed most likely to be effective based on available information, including barrier installation; earthen berm removal and other actions to reduce the attractiveness of the road relative to the surrounding habitat; environmentally triggered, flashing speed-reduction-sign installation; and vegetation manipulation. Again, because these management scenarios are not yet in play, we could not directly test them. Rather, we gathered data on the behavioral ecology of OSBs and the environmental conditions of the road compared to surrounding habitat to determine which mitigation measures would have the greatest potential for effectiveness. To inform mitigation options we examined six questions about environmental conditions across habitats or microhabitats and how these correlated with OSB presence.
Author: Cassandra F. Doll
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages :
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Book Description
Herbicides are used as management tools to improve habitat for native plants and animals, but their application may also have harmful effects on the native community. The federally threatened Oregon silverspot butterfly (Speyeria zerene hippolyta) resides in remnant native grasslands along the Pacific Northwest coast. However, like many grasslands, many of these areas are overwhelmed with invasive plants, such as false dandelion (Hypochaeris radicata) and velvet grass (Holcus lanatus). These and other invasive plants severely limit the abundance of the Oregon silverspot’s larval hostplant, the early blue violet (Viola adunca). Selective herbicides, such as clopyralid and fluazifop-p-butyl, can reduce invasive plant abundance. However, non-target effects of these herbicides, and of adjuvants applied with these herbicides, on the Oregon silverspot are unknown. In our study, we applied herbicides and adjuvants to both hostplants and larvae of a subspecies closely related to the Oregon silverspot, the Zerene silverspot (S. z. zerene). Responses measured in two experiments included survival, sex ratio, development time, mass, morphology, fecundity, and behavior. Our results suggest that negative effects of herbicides, clopyralid and fluazifop-p-butyl, and adjuvants, Agri-Dex® and Nu Film® IR, are limited. However, we detected weak effects of clopyralid, clopyralid with Agri-Dex®, fluazifop-p-butyl, and fluazifop-p-butyl with Agri-Dex® on larval and pupal development time and pupal mass. Any possible negative direct effects of herbicides on Oregon silverspots must be weighed against the positive indirect effects that herbicides are likely to have on the butterfly through improvements in habitat conditions. Our findings will inform managers who are selecting among available tools with which to restore native plant communities, while minimizing adverse effects on declining species, such as the Oregon silverspot.
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Category : Endangered plants
Languages : en
Pages : 156
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Author: Edgar Kaeslin
Publisher: Fao Inter-Departmental Working Group
ISBN:
Category : Nature
Languages : en
Pages : 128
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Book Description
Major climate-induced changes -- Consequences of climate change -- Measures for adaptation to climate change -- Conclusions -- References.
Author:
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ISBN:
Category : Ecosystem management
Languages : en
Pages : 540
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Author: Mark V. Stalmaster
Publisher: Universe Publishing(NY)
ISBN:
Category : Nature
Languages : en
Pages : 256
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Book Description
A thorough study of the bald eagle with information on evolution, classification, breeding and nesting, feeding and foraging, reproduction and survival.
Author: Olof C. Wallmo
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 632
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Book Description
Developed in co-operation with U.S. Department of Agriculture, Forest Service.
Author: Richard S. Wydoski
Publisher: Amer Fisheries Society
ISBN: 9780295983387
Category : Nature
Languages : en
Pages : 322
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Book Description
This updated and greatly expanded edition of Inland Fishes of Washington describes all the known native and introduced fishes found in freshwater habitats of Washington State. The authors have created a valuable reference for anglers, biologists, teachers, students, and environmentalists in the Northwest. This wide-ranging study summarizes current knowledge on the appearance, distribution, growth, reproduction, food habits, and longevity of these fishes. The descriptions range from the ubiquitous salmon and steelhead to the Olympic mudminnow, a fish found only in the state of Washington. All are here placed within the context of the many mutually supporting species that together make up the ecological network that sustains them. An overview of Washington's topography and natural provinces clarifies the influence of geographical, historical, economic, and political forces on the existence of freshwater fishes today. The book provides instruction on the basic methods of fish identification, with keys and illustrations that bring together the traits and forms most useful in distinguishing species and subspecies. The authors are well known to fisheries professionals in the Pacific Northwest for their studies of fish, publications in professional fisheries journals, their university teaching, and first-hand experience in the field of fisheries management and research.
Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category : Birdhouses
Languages : en
Pages : 20
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Author: William E. Hammitt
Publisher: John Wiley & Sons
ISBN: 9780471194613
Category : Travel
Languages : en
Pages : 380
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Book Description
An authoritative guide to managing the ecological impacts of recreational activities on natural resources. The challenges facing today's recreation resource managers are both complex and daunting. Accommodating rapidly growing numbers of recreational visitors without sacrificing the ecological integrity of wildlands is a major challenge. Determining and planning for the limits of acceptable change and expanding services with little or no growth in natural resources or funding are major issues. Wildland Recreation, Second Edition provides solutions to these and other crucial recreational resource problems. Based upon its authors' extensive firsthand experience as well as their exhaustive review of the world literature on the subject, it provides up-to-date, detailed coverage of today's wildland recreation management issues, including: Ecological impacts of recreational activities on wildland resources Spatial and temporal patterns of recreational impacts Environmental durability, visitor use, and other key factors The limits of acceptable change, long-term monitoring, and impacts on wildlife Social and economic factors associated with managing impacts Alternative approaches to wildland recreation resource management Recent trends in satisfying increased demand for outdoor recreational opportunities International perspectives on recreational wildland management and ecotourism Like its best-selling predecessor, Wildland Recreation, Second Edition is a valuable working resource for wildland recreation management professionals and a comprehensive course text for students of forest and natural resources recreation, park management, environmental conservation, and related disciplines.
