Author: Portland State University. Center for Lakes and ReservoirsPublisher:
ISBN:
Category : Freshwater plants
Languages : en
Pages : 194
Book Description
Introduction to Common Native and Potential Invasive Freshwater Plants in Alaska
Author: Portland State University. Center for Lakes and ReservoirsPublisher:
ISBN:
Category : Freshwater plants
Languages : en
Pages : 194
Book Description
Invasiveness Ranking System for Non-native Plants of Alaska
Author: Matthew Lawrence CarlsonPublisher:
ISBN:
Category : Alien plants
Languages : en
Pages : 224
Book Description
Describes a ranking system used to evaluate the potential invasiveness and impacts of 113 non-native plants to natural areas in Alaska. Species are ranked by a series of questions in four broad categories: ecosystem impacts, biological attributes, distribution, and control measures. Also included is a climate screening procedure to evaluate the potential for establishment in three ecogeographic regions of Alaska [Juneau, Fairbanks, Nome].
Invasive plants of Alaska
Author: Selected Invasive Plants of Alaska
Author: Aquatic Monocotyledons of North America
Author: Donald H. LesPublisher: CRC Press
ISBN: 1351679694
Category : Nature
Languages : en
Pages : 556
Book Description
This book brings together information on the natural history, ecology and systematics of North American aquatic monocotyledons. The book is an overview of the biology of major aquatic species by compiling information from numerous sources that lie scattered among the primary literature, herbarium databases, and other reference sources. Information on more than 300 species in 87 genera of monocotyledons will be included. Recent phylogenetic analyses will be incorporated. Although focusing specifically on North America, the cosmopolitan distribution of many aquatic plants should make this an attractive text to people working virtually anywhere outside of the region as well. Key Selling Features: The primary source of natural history information on aquatic plants Comprehensive lists of ecological associates Synthetic overview of systematic relationships of aquatic species and genera Practical information for rare and invasive plant managers Essential guide to facilitate wetland delineation
Predicting Invasive Plant Species Range Expansion in Alaska
Author: Elizabeth Michelle BellaPublisher:
ISBN:
Category : Invasive plants
Languages : en
Pages : 244
Book Description
"Alaska is vulnerable to a variety of changes causing by a warming climate. Alaska is no longer thought to be immune to wide scale invasive plant species infestations. Planning tools are needed to anticipate area of potential change and to indentify invasive species of concern. I conducted a field study to determine presence or absence of any non-native vascular plant species per 100 m of transect keyed to vegetation type, canopy cover class, aspect, visitor use level, and use intensity on all major trails on and near Forest Service lands on the Kenai Peninsula, Alaska. Trailheads are thought to be sites of non-native species introduction to trail systems. Little is known about the number of introductions needed to establish a non-native species in northern climates, or the expected distances a particular species can be expected to spread up a trail. Prediction of non-native species spread along Alaskan trails is possible by examining vegetation type and intensity of use, with greatest impacts in open types with high use. I used biogeoclimatic models to forecast potential vulnerabilities with respect to invasive species distribution in Alaska. I selected three invasive plant species of interest in Alaska with different current distribution (reed canarygrass, present and widespread; purple loosestrife, present and limited; and leafy spurge, not yet present but considered potentially invasive). Species were modeling using two different predictive models (BIOCLIM in the DIVA-GIS platform and MaxEnt), two different future climates (Hadley and CCC), two emissions scenarios (A2, high and B2, low), for current climate plus three time steps (2020, 2050, 2080). Models were assessed with 25% test data, and then trained with 75% of the data. MaxEnt models performed better than DIVA-GIS models. All models showed current potential range that exceeds their known occurrence. For each species, we compared area difference in predicted habitat suitability between scenarios and between time steps in both models as a quantified measure of potential habitat change. I applied the modeling procedure to an additional twenty-four species to create an atlas of scenario maps for Alaska. All models showed current potential range that exceeds their known occurrence"--Leaves ii-iii.
The Invasive Plant Melilotus Alba in Alaska
Author: James SowerwinePublisher:
ISBN:
Category : Invasive plants
Languages : en
Pages : 212
Book Description
Invading plants may cause biochemical changes to native plants by altering resource availability, thereby also changing the forage quality of native plants for native browsers. I measured plant growth, carbon and nitrogen content, and tannin and total phenolic production, which generally lower forage quality, in the boreal native Salix alaxensis under differing scenarios of invasion by nitrogen-fixing Melilotus alba. Additionally, I evaluated whether different populations of M. alba in Alaska suspected of having different introduction histories varied in competitive ability. I found that in this common garden experiment shading and soil nitrogen levels consistent with those found in M. alba populations did not significantly negatively affect S. alaxensis forage quality. Increase in soil nitrogen was associated with overall greater available protein levels in the willows. Last, I found no differences in competitive abilities among populations from different regions around the state, indicating all populations should be treated as equally invasive.
Freshwaters of Alaska
Author: Alexander M. MilnerPublisher: Springer Science & Business Media
ISBN: 1461206774
Category : Science
Languages : en
Pages : 382
Book Description
Alaska's great size is mirrored by the large number and diversity of its freshwater ecosystems. This volume reviews and synthesizes research on a variety of Alaskan freshwaters including lakes, rivers and wetlands. The vast range of Alaskan habitats ensures that the chapters in this book will provide valuable information for readers interested in freshwaters, particularly nutrient dynamics, biotic adaptations, recovery mechanisms of aquatic biota, stream succession and the management of human-induced changes in aquatic habitats.
Invasive Elodea Threatens Remote Ecosystem Services in Alaska
Author: Tobias SchwoererPublisher:
ISBN:
Category : Elodea
Languages : en
Pages : 384
Book Description
This dissertation links human and ecological systems research to analyze resource management decisions for elodea, Alaska's first submerged aquatic invasive plant. The plant likely made it to Alaska through the aquarium trade. It was first discovered in urban parts of the state but is being introduced to remote water bodies by floatplanes and other pathways. Once introduced, elodea changes freshwater systems in ways that can threaten salmon and make floatplane destinations inaccessible. The analysis integrates multiple social and ecological data to estimate the potential future economic loss associated with its introduction to salmon fisheries and floatplane pilots. For estimating the effects on commercial sockeye fisheries, multiple methods of expert elicitation are used to quantify and validate expert opinion about elodea's ecological effects on salmon. These effects are believed to most likely be negative, but can in some instances be positive. Combined with market-based economic valuation, the approach accounts for the full range of potential ecological and economic effects. For analyzing the lost trip values to floatplane pilots, the analysis uses contingent valuation to estimate recreation demand for landing spots. A spatially-explicit model consisting of seven regions simulates elodea's spread across Alaska and its erratic population dynamics. This simulation model accounts for the change in region-specific colonization rates as elodea populations are eradicated. The most probable economic loss to commercial fisheries and recreational floatplane pilots is $97 million per year, with a 5% chance that combined losses exceed $456 million annually. The analysis describes how loss varies among stakeholders and regions, with more than half of statewide loss accruing to commercial sockeye salmon fisheries in Bristol Bay. Upfront management of all existing invasions is found to be the optimal management strategy for minimizing long-term loss. Even though the range of future economic loss is large, the certainty of long-term damage favors investments to eradicate current invasions and prevent new arrivals. The study serves as a step toward risk management aimed at protecting productive ecosystems of national and global significance.
Invasiveness Ranking System for Non Native Plants of Alaska
Author: Publisher:
ISBN:
Category : Alien plants
Languages : en
Pages : 24
Book Description
Describes a ranking system used to evaluate the potential invasiveness and impacts of 113 non-native plants to natural areas in Alaska. Species are ranked by a series of questions in four broad categories: ecosystem impacts, biological attributes, distribution, and control measures. Also included is a climate screening procedure to evaluate the potential for establishment in three ecogeographic regions of Alaska [Juneau, Fairbanks, Nome].