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Harlequin Duck Population Dynamics
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Book Synopsis Harlequin Duck Population Dynamics by : Daniel H. Rosenberg
Download or read book Harlequin Duck Population Dynamics written by Daniel H. Rosenberg and published by . This book was released on 2001 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: "We compared numbers of breeding pairs, age and sex composition, and population trends to determine whether harlequin duck (Histrionicus histrionicus) populations in oiled areas of western Prince William Sound (WPWS) and unoiled areas of eastern Prince William Sound (EPWS), Alaska exhibited similar demographic characteristics."--Page i.
Book Synopsis Harlequin Duck Population Dynamics by :
Download or read book Harlequin Duck Population Dynamics written by and published by . This book was released on 2005 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sex and age composition and population trends of harlequin ducks (Histrionicus histrionicus) were compared between, and within, oiled and unoiled areas in Prince William Sound during six winters from 1997-2005.
Book Synopsis Harlequin Duck Demography During Winter in Prince William Sound, Alaska by : Daniel Esler
Download or read book Harlequin Duck Demography During Winter in Prince William Sound, Alaska written by Daniel Esler and published by . This book was released on 2000 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1989 Exxon Valdez oil spill was a major perturbation of nearshore habitats of Prince William Sound, a wintering area for harlequin ducks (Histrionicus histrionicus). This research was designed to evaluate harlequin duck population recovery from the oil spill from 1995 to 1998, using a demographic approach to assess both the "product" of population changes (e.g., density differences; Chapter 4) and the demographic "processes" affecting population dynamics (e.g., survival; Chapter 3). Wintering aggregations of harlequin ducks are core population units from a population structure perspective and are largely demographically independent, due to high rates of winter site fidelity, pair formation during winter, and evidence that juveniles follow hens to wintering areas. Therefore, evaluation of population-level effects of the oil spill is appropriately directed at these wintering aggregations. We selected adult female survival as a primary demographic attribute to measure, as population dynamics of animals with life history characteristics like harlequin ducks are particularly sensitive to variation in adult female survival rates. Also, we speculated that oil spill effects during winter would be manifested as survival reductions. We found that winter densities of harlequin ducks were lower on oiled study areas than unoiled areas, after accounting for effects of habitat (Chapter 4), indicating that population recovery had not occurred. Also, we determined that adult female survival was lower on oiled areas than unoiled areas (Chapter 3), and speculated that this was related to documented oil exposure of harlequin duck populations in oiled areas coincident with our study. We also confirmed that our survival estimates were not biased by assumptions about effects of radio transmitters or fate of missing radios (Chapter 2). In Chapter 5, we reviewed all data relevant to harlequin duck recovery from the oil spill, including our demographic data, and concluded that population recovery had not occurred by 1998, deleterious effects persisted, and continued oil exposure likely was the primary constraint to full recovery. Although populations of many species may have recovered quickly from the Exxon Valdez spill, characteristics of harlequin ducks make their winter populations particularly susceptible, including their habitat associations, diet, life history. and energetics
Book Synopsis Harlequin Duck (Histrionicus Histrionicus) Conservation Assessment and Strategy for the United States Rocky Mountains by : Frances Cassirer
Download or read book Harlequin Duck (Histrionicus Histrionicus) Conservation Assessment and Strategy for the United States Rocky Mountains written by Frances Cassirer and published by . This book was released on 1996 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harlequin ducks (Histrionicus histrionicus) are sea ducks that migrate to mountain streams to breed. The species is classified as a U.S. forest Service sensitive species in the Northern, Rocky Mountain, and Pacific Northwest Regions, a state sensitive species in Oregon, a priority habitat species in Washington, and a species of special concern in Idaho, Montana, and Wyoming. Harlequin ducks are also classified as migratory waterfowl covered under general waterfowl or sea duck regulations throughout their range. This Conservation Assessment and Strategy addresses the status and conservation of harlequin ducks in the Rocky Mountains of Idaho, Montana, and Wyoming. The Conservation Assessment summarizes available information on the ecology and population status of the harlequin duck in Idaho, Montana, and Wyoming, and identifies potential threats to the species' viability in this region. The Conservation Strategy identifies management actions and information needed in order to maintain viable populations and protect and maintain critical habitats to ensure that listing is not warranted, in accordance with the Endangered Species Act (ESA) of 1973, as amended. The Conservation Assessment is based on inventory, monitoring, and research data collected in the U.S. Rocky Mountains since 1974. Approximately 300 pairs of harlequin ducks are estimated to breed in 57 breeding or probable breeding occurrences in the U.S. Rocky Mountains. A breeding occurrence is considered a single "breeding area", but may contain portions of several streams not separated by more than 10 km of unsuitable habitat, or 20 km of unoccupied, suitable habitat. Data gathered from marked individuals indicates a high degree of fidelity to these breeding occurrences. The harlequin duck breeding occurrences identified in the U.S. Rocky Mountains are comprised of reaches on 128 streams. Over 90% of the harlequin duck breeding occurrences in the U.S. Rocky Mountains occur on federal lands, primarily managed by the U.S. Forest Service and National Park Service. However, approximately 25% of these do cross some privately-owned land. The remaining 7% (4 breeding occurrences) are located predominately on state and privately-owned land. Not all Rocky Mountain breeding occurrences have been located. Potential breeding habitat is identified as 2nd-order or larger streams containing reaches with a average gradient of 1% - 7%, riffle habitat, clear water, gravel to boulder-sized substrate, and forested bank vegetation. Additional characteristics that may increase likelihood of use by harlequin ducks include: proximity to occupied habitat, overhanging bank vegetation, woody debris, loafing sites, absence of human activity, and inaccessibility. Potential threats to harlequin ducks in the U.S. Rocky Mountains include activities that affect riparian habitats, water yield, water quality, and increase disturbance during the breeding season. Habitat conditions in migratory and coastal areas are also critical to conservation of harlequin ducks. Harlequin ducks breeding in the Rocky Mountains have been located off the coasts of Oregon, Washington, and British Columbia. Harvest in coastal areas, while apparently low, could also potentially affect harlequin ducks in the Rocky Mountains. The Conservation Strategy emphasizes and adaptive approach for maintaining riparian and instream harlequin duck habitat. Guidelines are designed to maintain habitat quality by avoiding degradation form timber harvest, road construction and maintenance, mining, livestock grazing, water developments, and recreation. Guidelines include establishing stream buffers, maintaining instream flows and water quality, and reducing or not increasing human disturbance. Inventory and monitoring protocols are included for assessing the U.S. Rocky Mountain harlequin duck population size and trend and for individual project inventory and monitoring. Finally, areas where additional information is needed regarding basic ecology and management and methods to increase knowledge of management personnel and the public about harlequin duck and their conservation are identified.
Book Synopsis Population Genetic Structure, Kinship, and Social Associations in Three Harlequin Duck (Histrionicus Histrionicus) Breeding Subpopulations by : Margaret Elizabeth Brown (M.S. in ecology)
Download or read book Population Genetic Structure, Kinship, and Social Associations in Three Harlequin Duck (Histrionicus Histrionicus) Breeding Subpopulations written by Margaret Elizabeth Brown (M.S. in ecology) and published by . This book was released on 1998 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :RENEW (Canada). Harlequin Duck (eastern North American population) Recovery Team Publisher : ISBN 13 :9780662209621 Total Pages :30 pages Book Rating :4.2/5 (96 download)
Book Synopsis National Recovery Plan for the Harlequin Duck in Eastern North America by : RENEW (Canada). Harlequin Duck (eastern North American population) Recovery Team
Download or read book National Recovery Plan for the Harlequin Duck in Eastern North America written by RENEW (Canada). Harlequin Duck (eastern North American population) Recovery Team and published by . This book was released on 1995 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecology of Harlequin Ducks in Northern Idaho by : E. Frances Cassirer
Download or read book Ecology of Harlequin Ducks in Northern Idaho written by E. Frances Cassirer and published by . This book was released on 1994 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :André M. Breault Publisher :Delta, B.C.: Canadian Wildlife Service ISBN 13 :9780662183051 Total Pages :108 pages Book Rating :4.1/5 (83 download)
Book Synopsis Status Report on the Distribution and Ecology of Harlequin Ducks in British Columbia by : André M. Breault
Download or read book Status Report on the Distribution and Ecology of Harlequin Ducks in British Columbia written by André M. Breault and published by Delta, B.C.: Canadian Wildlife Service. This book was released on 1991 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecology and Conservation of North American Sea Ducks by : Jean-Pierre L. Savard
Download or read book Ecology and Conservation of North American Sea Ducks written by Jean-Pierre L. Savard and published by CRC Press. This book was released on 2015-04-13 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past decade has seen a huge increase in the interest and attention directed toward sea ducks, the Mergini tribe. This has been inspired, in large part, by the conservation concerns associated with numerical declines in several sea duck species and populations, as well as a growing appreciation for their interesting ecological attributes. Reflec
Book Synopsis Movement Patterns and Population Structure of Harlequin Ducks Wintering in the Strait of Georgia, British Columbia by : Heidi M. Regehr
Download or read book Movement Patterns and Population Structure of Harlequin Ducks Wintering in the Strait of Georgia, British Columbia written by Heidi M. Regehr and published by . This book was released on 2003 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: I investigated winter movement patterns and population structure of Harlequin Ducks (Histrionicus histrioniczrs) in the Strait of Georgia, British Colunlbia, Canada. Because of winter pairing, delayed maturation, and long-term pair bonds, movement patterns at wintering areas, particularly those of young birds that have not yet paired, are important to population structure. I used nasal- and radio-marking to determine movement distances, and multi-stratum models In capture-mark-recapture analysis to estimate movement rates among locations. I provide evidence that Harlequin Duck broods accompany their mothers from breeding streams to coastal wintering areas. Behavioural observations of family-like groups at the coast, and genetic analysis of blood samples from putative family members, suggested that observed groups were true families. Family migration in combination with philopatry, in the absence of dispersal, would lead to juvenile recruitment into the wintering populations of their relatives, and potentially to genetic and demographically isolated populations. Winter movement distances and rates did not differ by sex, likely due to extreme philopatry of paired males, slightly reduced philopatry of unpaired males, and intermediate philopatry of previously paired females. However, they did differ by age, with young birds in their first and second winters dispersing greater distances and at higher rates than older individuals. Isolation by distance and stepping stone gene flow models generated estimates for the among population component of genetic variance of less than 1% for the Strait of Georgia. Thus, due to dispersal of young individuals, which counteracts the isolating effects of philopatry and family migration, groups of Harlequin Ducks are unlikely to be genetically distinct at this scale. However, estimates from the stepping stone model for an increased number of colonies did suggest that, due to their linear coastal distribution, genetic differences could develop at the scale of their entire west coast of North America wintering range. Low movement rates between the northern and southern Strait of Georgia suggested that groups of wintering birds may be demographically distinct at this scale, and dispersal by both sexes indicated that recolonization or rescue of extinct or reduced groups is likely.
Book Synopsis Breeding Ecology of Harlequin Ducks (Histrionicus Histrionicus) on the Kaniksu National Forest, Idaho by : E. Frances Cassirer
Download or read book Breeding Ecology of Harlequin Ducks (Histrionicus Histrionicus) on the Kaniksu National Forest, Idaho written by E. Frances Cassirer and published by . This book was released on 1989 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluating Harlequin Duck Population Recovery by : Daniel Esler
Download or read book Evaluating Harlequin Duck Population Recovery written by Daniel Esler and published by . This book was released on 2010 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The North American Sea Ducks by : Paul Johnsgard
Download or read book The North American Sea Ducks written by Paul Johnsgard and published by Lulu.com. This book was released on 2016-11-09 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 21 species of sea ducks are one of the larger subgroups (Tribe Mergini) of the waterfowl family Anatidae, and the 16 species (one historically extinct) that are native to North America represent the largest number to be found on any continent, and also the largest number of endemic sea duck species native to any continent. Although generally not important as game birds, the sea ducks include some economically important birds such as the eiders, the basis for the Arctic eiderdown industry and a historically important food source for some Native American cultures. They also include what is probably the most northerly breeding species of all waterfowl and an icon of Arctic bird life, the long-tailed duck. The sea ducks also include species having some of the most complex and diverse pair-forming postural and acoustic displays of all waterfowl (goldeneyes and bufflehead), and some of the deepest diving species of all waterfowl (scoters and long-tailed duck). Sea ducks are highly prone to population disasters caused by oil spills and other water contaminants and, like other seabirds, are among the first bird groups that are being affected by current global warming trends in polar regions. This book is an effort to summarize succinctly our current knowledge of sea duck biology and to provide a convenient survey of the vast technical literature on the group, with over 900 literature references. It also includes 90,000 words of text (more than 40 percent of which is new), 15 updated range maps, 11 black & white and 20 color photographs, over 30 ink drawings, and nearly 150 sketches. Lastly, the North American sea ducks include the now extinct Labrador duck, the only northern hemisphere waterfowl species to have gone extinct in modern times. I have gratefully reprinted a Labrador duck watercolor by Sir Peter Scott. Considering recent population crashes in other sea ducks, such as the Steller's eider and spectacled eider, it should also offer a sobering reminder of the fragility of our natural world and its inhabitants, including us.
Book Synopsis Some Aspects of the Behavior and Ecology of Harlequin Ducks Breeding in Glacier National Park, Montana by : Craig Russell Kuchel
Download or read book Some Aspects of the Behavior and Ecology of Harlequin Ducks Breeding in Glacier National Park, Montana written by Craig Russell Kuchel and published by . This book was released on 1977 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior and ecology of harlequin ducks (Histrionicus histrionicus)on McDonald Creek in Glacier National Park, Montana, were studied during the 1973-1976 breeding seasons. Pairs were formed prior to arrival on the breeding grounds in early May. Harlequins confined nearly all activities to swiftly running waters, but also used stretches of abandoned stream-channel. Pairs were not territorial; home ranges were linear and consisted of approximately 1 to 2 km of stream habitat. Considerable overlap of home ranges occurred, especially at favored feeding sites. Density was approximately one pair per favored feeding sites. Density was approximately one pair per 1.1 to 1.5 km of stream. Males comprised 64 percent of the breeding population.
Author :Michael S. Rodway Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 : Total Pages :214 pages Book Rating :4.E/5 ( download)
Book Synopsis Timing of Pairing in Harlequin Ducks by : Michael S. Rodway
Download or read book Timing of Pairing in Harlequin Ducks written by Michael S. Rodway and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2003 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Literature Review and Summary of Research Priorities for Harlequin Duck by : James D. Reichel
Download or read book Literature Review and Summary of Research Priorities for Harlequin Duck written by James D. Reichel and published by . This book was released on 1996 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Harlequin Duck (Histrionicus histrionicus) is a small sea duck, which travels inland to breed on fresh water streams. Harlequins breed in western North America from Alaska and the Yukon south through western Montana to California (Harlequin Duck Working Group 1993); in eastern North America, they breed from Baffin Island south to eastern Quebec and Labrador (Goudie 1993). In the Palaearctic, they breed in Iceland, Greenland and Siberia (A.O.U. 1983). Approximately 110-150 pairs of Harlequins currently breed in Montana (Reichel and Genter 1994), with most located in the following areas: 1) tributaries of the lower Clark Fork River; 2) tributaries of the North, Middle, and South forks of the Flathead river; 3) streams coming off the east front of the Rocky Mountains; and 4) the boulder River (Miller 1988, 1989, Kerr 1989, Carlson 1990, Fairman And Miller 1990, Diamond and Finnegan 1992,1993). During the breeding season, Harlequins are found along fast mountain streams (Bengston 1966). In many areas, harlequins use streams with dense timber or shrubs on the banks (Cassirer and Groves 1990), but they are also found in relatively open streams along the east slope of the Rocky Mountains, Montana (Markum and Genter 1990, Diamond and Finnegan 1992), and the arctic tundra (Bengston 1972). In Idaho, 90% of observations occurred near old growth or mature timber stands (Cassirer and Groves 1990). Mid-stream rocks, logs, islands, or stream-side gravel bars serve as safe loafing sites and appear to be important habitat components. Most of the ducks arrive on their inland breeding areas in mid-April to early May; unmated males typically arrive before pairs (Kuchel 1977). The females and young remain on the streams until August or early September. This chronology is influenced by elevation and by the timing of spring runoff, it may vary up to several weeks between years. The U.S. Forest Service, Region 1, lists the Harlequin Duck as Sensitive (Reel et al 1989). The species is listed as a Species of Concern by the Montana (Montana Natural Heritage Program 1994) and Idaho (Idaho Conservation Data Center 1994) Natural Heritage Programs. The eastern and western populations are both listed under Category 2 as candidates for protection under the Endangered Species Act by the U.S. Fish and Wildlife Service (U.S. Department of Interior 1991). The Montana Natural Heritage Program began surveying Harlequin Ducks in 1988. The survey data gave rise to questions involving site fidelity, productivity and mortality. We began individually marking Harlequins to a limited extent in 1991; through 1995, a total of 249 Harlequins were marked on 9 streams, representing the largest population of marked Harlequins from breeding streams. Birds marked in Montana have subsequently been captured and observed on the coasts of Oregon, Washington and British Columbia, with most reports coming from Vancouver Island. During that time, we observed 20 previously marked adults returning to Montana streams.
Book Synopsis The Ecology and Distribution of the Harlequin Duck (Histrionicus Histrionicus) Wintering Off Isle Au Haut, Maine by : Glen Howard Mittelhauser
Download or read book The Ecology and Distribution of the Harlequin Duck (Histrionicus Histrionicus) Wintering Off Isle Au Haut, Maine written by Glen Howard Mittelhauser and published by . This book was released on 1989 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
