Download or read book Movements of Beluga Tagged at the Nastapoka River written by D. W. Doidge and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Beluga whales (Delphinapterus leucas) occupy Hudson Bay in summer where they are an important source of country-food for the Inuit. Two stocks have been identified; the western stock is estimated to contain at least 23,000 animals, approximately 15 times larger than the eastern stock (Richard et al 1990). The two stocks are genetically distinct (Brown et al 1997). The eastern stock has been designated by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) as threatened and a quota system has been applied to the Inuit subsistence harvest on the northern Quebec coast. The western stock has no quota since harvest levels are lower than the estimated sustainable yield. Aerial surveys in 1985 (Smith and Hammill 1986) and 1993 (DFO unpublished) indicate the summer distribution of beluga whales extends between the Quebec coast (Nunavik) and Sanikiluaq (Belcher Islands). Also, satellite tags, which transmitted for a short time in 1993, showed one whale, tagged at the Little Whale River on the Quebec coast, frequented areas offshore as far as the Belchers. These data would indicate a common stock between Nunavik and Sanikiluaq. However, genetic analysis indicates whales harvested in Sanikiluaq are more similar genetically to western Hudson beluga than those caught along the eastern Hudson Bay coast, just 100 km distant. The conflicting scientific information (genetic make-up vs distribution data) has led some Nunavik Inuit to question the scientific validity of the existing co-management regime and quota system. The number of satellite tags deployed in 1993 (DFO unpublished data) has not been sufficient to clearly resolve the movements of whales that frequent the Quebec coast. The hunters' association of the Nunavik Inuit (HFTA) requested that the issue of stock identity be resolved. A resolution supporting the satellite tagging project was passed at the HFTA's annual general meeting in 1998. With support from World Wildlife Fund Canada, Fisheries and Oceans and Makivik Corporation, three satellite tags were deployed on belugas at the Nastapoka River in 1999. ... In August, the tagged animals frequented the offshore between the mainland coast and the Belcher Islands, an area indicated to be the summer distribution of belugas previously by aerial surveys. While the single, gray animal ventured to the Belcher Islands, the time spent in that vicinity accounted for a small proportion of the time it was tracked (ca. 8%). The two adults with calves did not venture as far to the west. The sample size of tagged animals is too small to estimate the probability of animals that occupy the Nastapoka being caught at the Belchers. However, analysis of the DNA of belugas harvested at the Belchers indicates that the number having the eastern Hudson Bay haplotype is low. The degree of site-tenacity and estuarine use appears to be variable. Other studies demonstrate that belugas will return to the locality of tagging (Orr et al 1998, DFO unpublished data). However, the three whales tagged by us, did not appear to re-enter Nastapoka Estuary. Radio transmitters are becoming more dependable enabling data to be gathered over a longer period of time. Two tags transmitted long enough to indicate that whales remain in the Hudson Bay Area until early October. The start of a northward migration, presumably to over-wintering grounds in Hudson Strait, was documented for one whale until its transmitter sopped signaling near Puvirnituq in late October. A large quantity of data has been received from these satellite tags. The inshore areas of beluga habitat, such as estuaries, are well documented from traditional knowledge and scientific studies. The data from satellite tagged whales show areas, offshore of the Nastapoka Islands, where the whales have remained for several days. The bathymetry of these locations will be examined in relation to the whales' diving activities to better understand habitat-use of beluga whales in eastern Hudson Bay. This analysis is scheduled for Winter 2000-01. The method of using surgical pins to attach the transmitter to the whale's back remains invasive, but no alternative has yet been found. The number of whales tagged has been kept to a minimum. A thorough review of the dive data will determine if a realistic correction factor to account for submerged whales, not counted during aerial surveys can be estimated, or whether further tagging is needed"--ASTIS [online] database.
Download or read book Distribution and Movements of Beluga Whales from the Eastern Chukchi Sea Stock During Summer and Early Autumn written by Robert Suydam and published by CreateSpace. This book was released on 2015-06-26 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report includes data from two efforts to satellite tag beluga whales. The first was conducted by the Alaska Beluga Whale Committee (ABWC) through NOAA grant NA67FX0197, the Alaska Department of Fish and Game (ADF&G), the National Marine Fisheries Service (NMFS), the North Slope Borough (NSB), and the Village of Point Lay. This was the first time belugas in Alaska were instrumented with satellite tags. Ten belugas were tagged in 1998-1999. The second took place in 2000-2002. It was initiated by the ABWC and further supported by Minerals Management Service (MMS) through the Coastal Marine Institute. Other cooperators included NMFS, ADF&G, the NSB, the Village of Point Lay, and Alaska Marine Ecosystems Research.
Download or read book Study of Summer and Fall Movements and Dive Behaviour of Beaufort Sea Belugas Using Satellite Telemetry 1992 1995 written by P. R. Richard and published by Environmental Studies Research Funds. This book was released on 1997 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Summer and Fall Movements and Dive Behaviour of Beaufort Sea Belugas Using Satellite Telemetry 1992 95 written by and published by . This book was released on 1997 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes project methods and presents highlights of results from a study of Beaufort Sea belugas, involving the tracking and recording of dive behaviour using satellite-linked time-depth recorders. Over four years of field and laboratory work and analysis, 14 males and six female belugas were live-captured and tagged in the Mackenzie River delta with satellite transmitters that were used to obtain detailed behavioural data to study migration routes to summer and winter concentration areas, to understand the effect of beluga movements and diving on population estimates based on aerial surveys, and to study habitat preferences and habitat use. Results showed unexpected behaviour on the part of Beaufort Sea belugas.
Download or read book Advances in Research on the Beluga Whale Delphinapterus Leucas written by Thomas G. Smith and published by . This book was released on 1990 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collection of 14 articles representing a cross-section of current research on beluga whales, Delphinapterus leucas, in North American waters.
Download or read book Use of the Nastapoka Estuary by Humans and Belugas Summer 2000 written by D. W. Doidge and published by . This book was released on 2000 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: ... The number of whales in the Nastapoka estuary and their reaction to disturbance was recorded during July and August of 1983-4. (Caron 1987, Caron and Smith 1990). Observations, spanning a shorter time, were made in 1993 (Doidge 1994) and 2000 (present work). The purpose of the study in 2000 was to document the current use of the estuary by humans and beluga whales. In this paper, I discuss the new data in the context of the previous studies and re-examine the data from 1984. ... Summary and conclusions: The extent to which estuaries are important to beluga is not clear. Apart from aerial surveys, and to some extent satellite tagging, most other studies of belugas generate data that is specific to belugas in estuaries. Estuaries are the sampling sites. This can introduce a land-based bias when assessing what habitat is critical for the species. The number of belugas that can be observed, at any one time, during August at the Nastapoka River, has sharply decreased from the number seen in the 1980s. Several disturbance factors have likely caused the decline: boat traffic in the area is now almost daily; beluga hunting is now concentrated in the first week of August which may cause greater disturbance than harvesting in the past which occurred from June to September. A reduction in numbers at the Nastapoka is not direct evidence that the eastern Hudson Bay population has declined because to the concomitant increase in disturbance makes the situation difficult to interpret. However, the decrease in the overall mean age of the population does indicate a reduction in population size. Belugas in estuaries are highly susceptible to hunting pressure as they are easier to catch there, than in coastal or offshore waters. This susceptibility is not necessarily a management problem if the population size permits harvesting. It can be a problem, though if estuarine groups are considered management units (the whales that hunters want access to kill) or if the whales are considered special genetic units. In both of these cases, a large "estuarine" population becomes a management goal. A comparative study is planned for 2001 at Little Whale River, an estuary that has a different pattern and history of disturbance. (Au)--ASTIS online database.
Download or read book Fall Movements of Beluga Whales Captured in the Nushagak River in September 2006 written by Lori Trent Quakenbush and published by . This book was released on 2006 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summer Movements of Beluga Whales Captured in the Kvichak River in May 2002 and 2003 written by Lori Trent Quakenbush and published by . This book was released on 2002 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summer Movements of Beluga Whales Captured in the Kvichak River in May 2002 and 2003 written by Lori Trent Quakenbush and published by . This book was released on 2003 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summer Fall and Early Winter Behavior of Beluga Whales Delphinapterus Leucas Satellite tagged in Cook Inlet Alaska in 1999 and 2000 written by Kristin L. Laidre and published by . This book was released on 2017 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The following report contains detailed information on the movement patterns of beluga whales that were satellite-tagged in 1999 and 2000 in Cook Inlet, Alaska. The seasonal movements and dive patterns of three whales CI-9901, CI-0001, and CI-0002 were analyzed, and movement data from the whales tagged in 2000 were referenced to in a subsequent paper by Hobbs et al. (2005). However, the detailed analyses of diving behavior and movement patterns of these individual whales were never made available until now. The seasonal movements and dive patterns of three belugas in Cook Inlet, Alaska, were monitored between June and January 1999-2000 using satellite telemetry. One adult male whale was tagged on 30 May 1999 and tracked until 16 September 1999 (109 days), and one juvenile female and one adult male were tagged on 13 September 2000 and tracked until 2 (115 days) and 18 January 2001 (124 days), respectively. Whales remained in the inlet the entire time they were tracked. Mean dive depths across the entire tracking period ranged from 2.6 m (SD = 5.2) to 5.2 m (SD = 8.8). Mean dive durations ranged from 1.4 minutes (SD = 2.0) to 3.1 minutes (SD = 4.1). Overall mean time at surface (between 0 and 1 m) ranged from 23% to 70% and appeared to be related to season and location. Behavioral periods were identified for each whale (4-60 days) based on stationary movements in a particular part of the inlet and unique diving behavior during that time. Significant differences were found between diving behavior and tidal rate of change and direction, as well as whale location and average sea-ice concentration. Belugas in Cook Inlet display seasonal variation in dive behavior and movement patterns, both of which have implications for sightings rates, correction factors, and abundance estimates obtained for the population. [doi:10.7289/V5AFSC-PR-2017-08 (https://doi.org/10.7289/V5/AFSC-PR-2017-08)].
Download or read book Canadian Bulletin of Fisheries and Aquatic Sciences written by and published by . This book was released on 1979 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Honoring Our Elders written by William W. Fitzhugh and published by Washington, D.C. : Arctic Studies Center, National Museum of Natural History, Smithsonian Institution. This book was released on 2002 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of the International Whaling Commission written by International Whaling Commission and published by . This book was released on 1984 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sexual Segregation in Vertebrates written by Kathreen Ruckstuhl and published by Cambridge University Press. This book was released on 2005 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Males and females of many species can, and do, live separately for long periods of time. This sexual segregation is widespread and can be on social, spatial or habitat scales. An understanding of sexual segregation is important in the explanation of life history and social preference, population dynamics and the conservation of rare species. Sexual Segregation in Vertebrates explores the reasons why this behaviour has evolved and what factors contribute to it.
Download or read book Aquatic Sciences and Fisheries Abstracts written by and published by . This book was released on 1991-10 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction To Environmental Impact Assessment written by John Glasson and published by Routledge. This book was released on 2005-09-30 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Published in 1994. Routledge is an imprint of Taylor & Francis, an informa company.
Download or read book Gillnets and Cetaceans written by William F. Perrin and published by . This book was released on 1994 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
