Download or read book Abundance Index of St Lawrence Estuary Beluga Delphinapterus Leucas from Aerial Visual Surveys Flown in August 2014 and an Update on Reported Deaths written by Jean-François Gosselin and published by . This book was released on 2017 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: “The beluga is an Arctic species, and the St. Lawrence Estuary (SLE) population is at the southernmost limit of the species distribution. Up until 2007, the population appeared to be stable. However, unusually high numbers of young of the year found dead in 2008 and 2012, and a low aerial photographic estimate of abundance in 2009, triggered a review of the population status in 2013. Based largely on this review, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) re-evaluated the status of SLE beluga in 2014, and recommended that the population be designated as ‘Endangered’ (COSEWIC 2014). Here, we present a new abundance index of SLE beluga from a series of eight visual aerial systematic line-transect surveys flown in August and September 2014. This will be used to evaluate trends in abundance along with the 36 visual surveys completed with similar methods since 2001. We also present an update on the number of beluga carcasses that have been recovered since the last assessment (DFO 2014)"--Introd., p. 1, 2.
Download or read book Assessment Approaches to Support Bycatch Management for Marine Mammals written by Tessa Francis and published by Frontiers Media SA. This book was released on 2022-06-21 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Update of Beluga Delphinapterus Leucas Abundance and Reported Deaths in the St Lawrence River Estuary written by and published by . This book was released on 2017 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The St. Lawrence Estuary (SLE) beluga population is located at the southernmost limit of the species range. It occurs primarily in the SLE and seasonally in the Gulf of St. Lawrence. A review of the population status (2007) concluded that the population over the period 1988-2007 was stable. However, in recent years there has been an increase in reported deaths of young-of-the-year and an apparent increase in perinatal mortalities. This increase as well as change in the age/sex structure of the deaths suggests that its status may have changed. A review in 2013 incorporated carcass monitoring and aerial survey data into a population model. The model results indicate that the population was slightly increasing from the 1960s to the early 2000s and has probably declined, to under 1000 animals during the last decade. The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) designated the population as ‘endangered’ in 2014, and its status is "threatened" according to the Species at Risk Act. In 2014, new aerial surveys were flown. The Species at Risk directorate requested that these surveys be reviewed and that the number of reported deaths be updated"--Context, p. [1].
Download or read book Summer Abundance Indices of St Lawrence Estuary Beluga Delphinapterus Leucas from a Photographic Survey in 2009 and 28 Line Transect Surveys from 2001 to 2009 written by Jean-François Gosselin and published by . This book was released on 2014 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimate of Cumberland Sound Beluga Delphinapterus Leucas Population Size from the 2014 Visual and Photographic Aerial Survey written by Marianne Marcoux and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimated Abundance of the Western Hudson Bay Beluga Stock from the 2015 Visual and Photographic Aerial Survey written by Cory J.D. Matthews and published by . This book was released on 2017 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book St Lawrence Estuary Beluga Delphinapterus Leucas Population Parameters Based on Photo identification Surveys 1989 2012 written by Robert Michaud and published by . This book was released on 2014 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimate of Cumberland Sound Beluga Delphinapterus Leucas Population Size from the 2014 Visual and Photographic Aerial Survey written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Anthropogenic Noise on Animals written by Hans Slabbekoorn and published by Springer. This book was released on 2018-08-20 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past several years, many investigators interested in the effects of man-made sounds on animals have come to realize that there is much to gain from studying the broader literature on hearing sound and the effects of sound as well as data from the effects on humans. It has also become clear that knowledge of the effects of sound on one group of animals (e.g., birds or frogs) can guide studies on other groups (e.g., marine mammals or fishes) and that a review of all such studies together would be very useful to get a better understanding of the general principles and underlying cochlear and cognitive mechanisms that explain damage, disturbance, and deterrence across taxa. The purpose of this volume, then, is to provide a comprehensive review of the effects of man-made sounds on animals, with the goal of fulfilling two major needs. First, it was thought to be important to bring together data on sound and bioacoustics that have implications across all taxa (including humans) so that such information is generally available to the community of scholars interested in the effects of sound. This is done in Chaps. 2-5. Second, in Chaps. 6-10, the volume brings together what is known about the effects of sound on diverse vertebrate taxa so that investigators with interests in specific groups can learn from the data and experimental approaches from other species. Put another way, having an overview of the similarities and discrepancies among various animal groups and insight into the “how and why” will benefit the overall conceptual understanding, applications in society, and all future research.
Download or read book Estimate of Cumberland Sound Beluga Delphinapterus Leucas Population Size from the 2014 Visual and Photographic Aerial Survey written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Belugas (Delphinapterus leucas) in Cumberland Sound are a genetically distinct population in the Canadian eastern Arctic. They have been designated as threatened by the Committee on the Status of Endangered Wildlife in Canada due to a possible decline in abundance. To provide an update to the 2009 population estimate an aerial survey was conducted in August 2014. The 2014 survey had two components; a photographic survey of Clearwater Fiord (a small inlet in the northwest corner of Cumberland Sound), and a visual survey of the northern and western parts of Cumberland Sound. The photographic survey completely covered Clearwater Fiord four times as this is known to be an area where belugas aggregate in the summer months. The survey of the northern part of Cumberland Sound was completed twice, whereas the survey of the western part of Cumberland Sound was completed once. Different correction factors for availability bias were calculated according to the presumed depth at which belugas could be seen from the aircraft and on photos. The corrected estimate for Clearwater Fiord was 603 [coefficient of variance (CV) = 0.076, 95% confidence interval (CI) = 519-699], while the estimate for the northern part of Cumberland Sound was 548 (CV = 0.445, 95% CI = 240-1256). No belugas were seen in the western part of Cumberland Sound. This resulted in a total population abundance of 1151 (CV = 0.214, 95% CI = 760-1744) belugas.
Download or read book Responding to Oil Spills in the U S Arctic Marine Environment written by National Research Council and published by National Academies Press. This book was released on 2014-08-01 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: U.S. Arctic waters north of the Bering Strait and west of the Canadian border encompass a vast area that is usually ice covered for much of the year, but is increasingly experiencing longer periods and larger areas of open water due to climate change. Sparsely inhabited with a wide variety of ecosystems found nowhere else, this region is vulnerable to damage from human activities. As oil and gas, shipping, and tourism activities increase, the possibilities of an oil spill also increase. How can we best prepare to respond to such an event in this challenging environment? Responding to Oil Spills in the U.S. Arctic Marine Environment reviews the current state of the science regarding oil spill response and environmental assessment in the Arctic region north of the Bering Strait, with emphasis on the potential impacts in U.S. waters. This report describes the unique ecosystems and environment of the Arctic and makes recommendations to provide an effective response effort in these challenging conditions. According to Responding to Oil Spills in the U.S. Arctic Marine Environment, a full range of proven oil spill response technologies is needed in order to minimize the impacts on people and sensitive ecosystems. This report identifies key oil spill research priorities, critical data and monitoring needs, mitigation strategies, and important operational and logistical issues. The Arctic acts as an integrating, regulating, and mediating component of the physical, atmospheric and cryospheric systems that govern life on Earth. Not only does the Arctic serve as regulator of many of the Earth's large-scale systems and processes, but it is also an area where choices made have substantial impact on life and choices everywhere on planet Earth. This report's recommendations will assist environmentalists, industry, state and local policymakers, and anyone interested in the future of this special region to preserve and protect it from damaging oil spills.
Download or read book Dolphins Whales and Porpoises written by Randall R. Reeves and published by IUCN. This book was released on 2003 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Sonar of Dolphins written by Whitlow W.L. Au and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The extraordinary ability of dolphins to echolocate has fascinated scientists and the public since its discovery in the late 1950's. This is the first book to summarize modern research in this area, and presents a broad synthesis of this very interdisciplinary subject. The author is an internationally-recognized expert on dolphin sonar and is thus in a unique position to bring together research on the physiological, mathematical and engineering aspects of the subject. Of interest to auditory researchers, electrical engineers, acoustical physicists, and mammalian physiologists.
Download or read book Marine Mammal Ecology and Conservation written by Ian L. Boyd and published by Oxford University Press. This book was released on 2010-08-12 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: Much of our knowledge about marine mammals is derived from a long-term and dedicated research effort that is evolving rapidly due to the introduction and invention of new methods.This book reflects the inventiveness of marine researchers as they try to find ways around the problems presented to them by these unusual and challenging animals.
Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.
Download or read book Planar PCB Hazards to Fish Wildlife and Invertebrates written by Ronald Eisler and published by . This book was released on 1996 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
