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Age And Sex Ratios Of Sea Ducks Wintering In The Strait Of Georgia British Columbia Canada 2003 2004 2008 2014 2015
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Book Synopsis Age and Sex-ratios of Sea Ducks Wintering in the Strait of Georgia, British Columbia, Canada (2003, 2004, 2008, 2014, 2015) by : Michael S. Rodway
Download or read book Age and Sex-ratios of Sea Ducks Wintering in the Strait of Georgia, British Columbia, Canada (2003, 2004, 2008, 2014, 2015) written by Michael S. Rodway and published by . This book was released on 2020 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sex and Age-Specific Distributions of Sea Ducks Wintering in the Strait of Georgia, British Columbia by : Samuel A. Iverson
Download or read book Sex and Age-Specific Distributions of Sea Ducks Wintering in the Strait of Georgia, British Columbia written by Samuel A. Iverson and published by . This book was released on 2006-01-01 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study uses sex and age ratios calculated from direct visual counts to assess the demographic structure of the nine most common sea duck species wintering in the Strait of Georgia, British Columbia. It concludes that winter sex and age ratio surveys are a reliable, inexpensive means of gathering important demographic data.
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 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 Species of Waterfowl and Age and Sex Ratios of Ducks Harvested in Canada During the 1969-70 Season by : Denis A. Benson
Download or read book Species of Waterfowl and Age and Sex Ratios of Ducks Harvested in Canada During the 1969-70 Season written by Denis A. Benson and published by . This book was released on 1970 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents results of biometric investigations of samples of wings of ducks and tail fans of geese collected in species composition surveys, with comparison to results of earlier investigations and discussion of trends. Data are presented regarding: estimated retrieved kill of numerically important duck species (other than sea ducks) and goose species by holders of a Canada migratory game bird hunting permit, in total and by province; and age ratios (immatures per adult) and sex ratios (males per female) of the 11 most numerically important sport ducks, by province.
Book Synopsis Species of Waterfowl and Age and Sex Ratios of Ducks and Geese Harvested in Canada During the 1975 Season by : Canadian Wildlife Service
Download or read book Species of Waterfowl and Age and Sex Ratios of Ducks and Geese Harvested in Canada During the 1975 Season written by Canadian Wildlife Service and published by ottawa : canadian wildlife service. This book was released on 1977 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Age and Sex Ratios of Ducks Harvested During the 1968-69 Hunting Season by : Denis A. Benson
Download or read book Age and Sex Ratios of Ducks Harvested During the 1968-69 Hunting Season written by Denis A. Benson and published by Canadian Wildlife Service. This book was released on 1970 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Clam Predation by Scoter Ducks in the Strait of Georgia, British Columbia, Canada by : N. Bourne
Download or read book Clam Predation by Scoter Ducks in the Strait of Georgia, British Columbia, Canada written by N. Bourne and published by . This book was released on 1984 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collections were made of three species of scoter ducks, white-winged, surf and black, Melanitta deglandi, M. perspicillata andM. nigra, wintering at two clam beaches in southern BritishColumbia. Analysis of the crop and gizzard contents showed theseducks were feeding primarily on bivalves in the intertidal area. The commercially-important littleneck and minla clams, Protothacastaminea and Tapes philippinarum, comprised over half the gutcontents of scoters. It was estimated that a wintering flock of200 scoters could remove 5.3 to 15.9 tonnes of littleneck and/ormanile clams from these two beaches in a six month period.
Book Synopsis Ducks, Geese, and Swans of the World by : Paul A. Johnsgard
Download or read book Ducks, Geese, and Swans of the World written by Paul A. Johnsgard and published by . This book was released on 1978 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of this book is to provide information on each of the species of the waterfowl family in a standardized format and easily accessible manner.
Book Synopsis Final recovery plan for the steller sea lion (Eumetopias jubatus) by :
Download or read book Final recovery plan for the steller sea lion (Eumetopias jubatus) written by and published by . This book was released on 1994 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Handbook of Global Freshwater Invasive Species by : Robert A. Francis
Download or read book A Handbook of Global Freshwater Invasive Species written by Robert A. Francis and published by Routledge. This book was released on 2012-03-12 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasive non-native species are a major threat to global biodiversity. Often introduced accidentally through international travel or trade, they invade and colonize new habitats, often with devastating consequences for the local flora and fauna. Their environmental impacts can range from damage to resource production (e.g. agriculture and forestry) and infrastructure (e.g. buildings, road and water supply), to human health. They consequently can have major economic impacts. It is a priority to prevent their introduction and spread, as well as to control them. Freshwater ecosystems are particularly at risk from invasions and are landscape corridors that facilitate the spread of invasives. This book reviews the current state of knowledge of the most notable global invasive freshwater species or groups, based on their severity of economic impact, geographic distribution outside of their native range, extent of research, and recognition of the ecological severity of the impact of the species by the IUCN. As well as some of the very well-known species, the book also covers some invasives that are emerging as serious threats. Examples covered include a range of aquatic and riparian plants, insects, molluscs, crustacea, fish, amphibians, reptiles and mammals, as well as some major pathogens of aquatic organisms. The book also includes overview chapters synthesizing the ecological impact of invasive species in fresh water and summarizing practical implications for the management of rivers and other freshwater habitats.
Book Synopsis Marine Anthropogenic Litter by : Melanie Bergmann
Download or read book Marine Anthropogenic Litter written by Melanie Bergmann and published by Springer. This book was released on 2015-06-01 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes how man-made litter, primarily plastic, has spread into the remotest parts of the oceans and covers all aspects of this pollution problem from the impacts on wildlife and human health to socio-economic and political issues. Marine litter is a prime threat to marine wildlife, habitats and food webs worldwide. The book illustrates how advanced technologies from deep-sea research, microbiology and mathematic modelling as well as classic beach litter counts by volunteers contributed to the broad awareness of marine litter as a problem of global significance. The authors summarise more than five decades of marine litter research, which receives growing attention after the recent discovery of great oceanic garbage patches and the ubiquity of microscopic plastic particles in marine organisms and habitats. In 16 chapters, authors from all over the world have created a universal view on the diverse field of marine litter pollution, the biological impacts, dedicated research activities, and the various national and international legislative efforts to combat this environmental problem. They recommend future research directions necessary for a comprehensive understanding of this environmental issue and the development of efficient management strategies. This book addresses scientists, and it provides a solid knowledge base for policy makers, NGOs, and the broader public.
Book Synopsis Overview of mitigation measures to reduce the incidental catch of vulnerable species in fisheries by : Sacchi, J.
Download or read book Overview of mitigation measures to reduce the incidental catch of vulnerable species in fisheries written by Sacchi, J. and published by Food & Agriculture Org.. This book was released on 2021-06-23 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Potentially harmful contact between fisheries and marine vulnerable species represents a global conservation issue and efforts to mitigate the negative repercussions of these interactions belong in strategies for ensuring the sustainability of fisheries. This literature review offers a survey of mitigation measures and techniques that have been developed and tested around the world, aiming to address both the incidental catch of highly mobile species – specifically, cetaceans, seabirds, sharks and rays, and sea turtles – and depredation caused by dolphins. Based on research detailed in over 300 documents, including peer-reviewed publications, reports from international organizations and papers available on the internet, most of the mitigation techniques illustrated are still under development, with only a few already adopted through legislation. The selected mitigation measures are grouped by main types of fishing gear – gillnets and trammel nets, longlines and lines, trawls, purse seines, traps and pots – and further subdivided according to which of the four main groups of vulnerable species – cetaceans, seabirds, sharks and rays, or sea turtles – they are designed to protect. Preventive and curative approaches covering both technical measures (gear modifications, strategies, as well as acoustic, visual, magnetic and chemosensory deterrents) and management measures are described.
Book Synopsis Current Ornithology Volume 17 by : Charles F. Thompson
Download or read book Current Ornithology Volume 17 written by Charles F. Thompson and published by Springer Science & Business Media. This book was released on 2010-09-09 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current Ornithology publishes authoritative, up-to-date, scholarly reviews of topics selected from the full range of current research in avian biology. Topics cover the spectrum from the molecular level of organization to population biology and community ecology. The series seeks especially to review (1) fields in which an abundant recent literature will benefit from synthesis and organization, or (2) newly emerging fields that are gaining recognition as the result of recent discoveries or shifts in perspective, or (3) fields in which students of vertebrates may benefit from comparisons of birds with other classes. All chapters are invited, and authors are chosen for their leadership in the subjects under review.
Book Synopsis Birds of the Chukchi Peninsula and Wrangel Island by : Leonid Aleksandrovich Portenko
Download or read book Birds of the Chukchi Peninsula and Wrangel Island written by Leonid Aleksandrovich Portenko and published by . This book was released on 1989 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Conservation Biology for All by : Navjot S. Sodhi
Download or read book Conservation Biology for All written by Navjot S. Sodhi and published by OUP Oxford. This book was released on 2010-01-08 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conservation Biology for All provides cutting-edge but basic conservation science to a global readership. A series of authoritative chapters have been written by the top names in conservation biology with the principal aim of disseminating cutting-edge conservation knowledge as widely as possible. Important topics such as balancing conversion and human needs, climate change, conservation planning, designing and analyzing conservation research, ecosystem services, endangered species management, extinctions, fire, habitat loss, and invasive species are covered. Numerous textboxes describing additional relevant material or case studies are also included. The global biodiversity crisis is now unstoppable; what can be saved in the developing world will require an educated constituency in both the developing and developed world. Habitat loss is particularly acute in developing countries, which is of special concern because it tends to be these locations where the greatest species diversity and richest centres of endemism are to be found. Sadly, developing world conservation scientists have found it difficult to access an authoritative textbook, which is particularly ironic since it is these countries where the potential benefits of knowledge application are greatest. There is now an urgent need to educate the next generation of scientists in developing countries, so that they are in a better position to protect their natural resources.
Book Synopsis Arctic Social Indicators by : Joan Nymand Larsen
Download or read book Arctic Social Indicators written by Joan Nymand Larsen and published by Nordic Council of Ministers. This book was released on 2015-02-18 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arctic Social Indicators II (ASI-II) is a follow-up activity to ASI-I (2010) and the first Arctic Human Development Report (AHDR, 2004). The objective of ASI (2010) was to develop a small set of Arctic specific social indicators that as a collective would help facilitate the tracking and monitoring of change in human development in the Arctic. ASI indicators were developed for six domains that are considered prominent aspects of human development in the Arctic by residents in the Arctic: Health and Population; Material Wellbeing; Education; Cultural Wellbeing; Contact with Nature; and Fate Control. The objective of the present volume of ASI is to present and discuss the findings of the work on measuring the set of recommended ASI indicators; to conduct a series of regional case studies to illustrate and test the strength and applicability of these indicators; to identify and describe data challenges for the Arctic region specifically in relation to these Arctic specific indicators and to draw conclusions about the ability of ASI to track changes in human development; and to formulate policy relevant conclusions for the long-term monitoring of Arctic human development. The core content of ASI-II is a set of five carefully selected case studies, which form the basis for drawing conclusions about the applicability of the ASI indicators and for formulating policy relevant conclusions. Case studies are performed for Sakha Republic (Yakutia); the West-Nordic Region; Northwest Territories; Inuit Regions of Alaska; and the Inuit World, with the Survey of Living Conditions in the Arctic (SLiCA) used to augment ASI. Findings on the state and changes in Arctic human development and wellbeing are presented. Based on our analysis and conclusions from the five case studies the framework for an ASI monitoring system is introduced. We argue that the long-term monitoring of human development in the Arctic would be greatly facilitated by the regular and frequent collection and reporting of relevant data, including those required for the proposed small set of ASI indicators.
