Download or read book Distribution and Counts of Harbour Phoca Vitulina and Grey Seals Halichoerus Grypus on the Atlantic Coast of Nova Scotia and Bay of Fundy from Aerial and Land Surveys 2019 2021 written by Damian Lidgard and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Our knowledge of the summer abundance and distribution of harbour and grey seals in eastern Canada is limited due to lack of surveys. Between 2019 and 2021, land and aerial surveys were conducted to determine the size and distribution of harbour and grey seal haulouts along the Atlantic coast of Nova Scotia (NS) and Bay of Fundy and in the Bras D'Or Lake, NS"--Abstract.
Download or read book Counts and Spatial Distribution of Harbour Seals Phoca Vitulina and Grey Seals Halichoerus Grypus from an Aerial Survey of the Coast of the Newfoundland Shelf and Sandwich Bay Labrador During the Summer of 2021 written by Charmain D. Hamilton and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Harbour seals reside throughout the year around Newfoundland and Labrador (NL) at unknown abundance levels. The first systematic survey for harbour seals occurred along the NL Shelf during July and August 2021 to obtain haul-out counts and assess distribution. Grey seals were also recorded as these two species can share haul-out locations. Photographic surveys were flown along the coastline with a Bell 429 helicopter. 3,341 seals were seen hauled out and identified as harbour, grey or unknown seals. After the unknown seals were assigned to species, 2,961 harbour and 380 grey seals were estimated to be seen. The largest numbers of harbour seals were found in the Grey Islands, Saint Pierre and Miquelon (France) and along the southern coast of Newfoundland east of Bay d'Espoir. Grey seals were only observed hauled out in southern Newfoundland, primarily west of Placentia Bay. No seals were seen hauled out in Sandwich Bay, Labrador. Despite differences in methodology compared to previous work, the results indicate that harbour seals have disappeared from previously occupied areas. Although increases have probably occurred in some areas, this species has likely not regained the abundance levels present before the bounty hunt (1952-1976). Future surveys are needed to understand regional population trends and gain a better understanding of counts and distribution in Labrador"--Abstract, page iv.
Download or read book Harbour Seal Phoca Vitulina and Grey Seal Halichoerus Grypus Abundance in the St Lawrence Estuary written by V. Lesage and published by Mont-Joli, Québec : Fisheries and Oceans, Canada. This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harbour Seal Phoca Vitulina and Grey Seal Halichoerus Grypus Abundance in the St Lawrence Estuary written by Maurice Lamontagne Institute and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: An aerial survey and several boat surveys were conducted during April-September 1994 to obtain information on harbour and grey seal abundance and distribution in the Saint-Lawrence Estuary. A total of 389 harbour seals and 111 grey seals were counted on or near haul-out sites during the aerial survey flown in August.
Download or read book Gray Seals in Nantucket Sound Massachusetts Winter and Spring 1994 written by Valerie Rough and published by . This book was released on 1995 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Aerial Survey Estimate of 1989 Grey Seal halichoerus Grypus Pup Production in St George s Bay Nova Scotia written by M.O. Hammill and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pup Production at Scotian Shelf Grey Seal Halichoerus Grypus Colonies in 2016 written by C. E. den Heyer and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment of Canadian Northwest Atlantic Grey Seals Halichoerus Grypus written by and published by . This book was released on 2017 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Distribution and Abundance of Harbor Seals Phoca Vitulina Concolor and Gray Seals Halichoerus Grypus in Southern New England Winter 1998 summer 1999 written by Margaret E. Barlas and published by . This book was released on 1999 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gray Halichoerus Grypus and Harbor Seal Phoca Vitulina Bycatch and Depredation in New England Sink gillnet Fisheries written by Laura N. Sirak and published by . This book was released on 2015 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine mammals interact with commercial fisheries via competition for resources, depredation (feeding on fish caught in gear), entanglement, and bycatch in fishing gear. In New England, gray seals (Halichoerus grypus) and harbor seals (Phoca vitulina) are often taken as bycatch in sink-gillnet fisheries and are believed to depredate fish in gillnets. As seal populations increase, interactions with fisheries are also likely to increase, affecting both seal stocks and the New England fishing industry. This study aims to understand seal bycatch in the New England sink-gillnet fisheries by identifying the spatial and temporal trends in bycatch as well as the characteristics of seals that are taken most frequently as bycatch. Depredation is also a concern in the commercial fishing industry, however, there is some controversy among fishermen and scientists concerning the identification of the species responsible for depredation (e.g. seal vs. spiny dogfish (Squalus acanthias)). Therefore, a protocol for identifying seal and spiny dogfish depredation was developed and used to identify depredation in a small-scale study of the sink-gillnet fishery targeting skate. Data from the Northeast Fisheries Observer Program (NEFOP) from 2005-2013 were analyzed to assess seal bycatch in the Northeast sink-gillnet fishery. Male seals were taken significantly more frequently than females, with young of the year most commonly occurring as bycatch. Areas where seals were taken in New England shifted seasonally, generally following the annual life history of each seal species. Gray seal bycatch showed an increasing trend over the years of study, with highest bycatch occurring in the spring in areas closest to haul out sites: Muskeget and Monomy Island, MA, USA. Harbor seal bycatch was much more variable between years, with highest bycatch occurring in the winter near major harbor seals haul out sites along the southern Maine coast and southeastern Massachusetts. This study was a crucial step to understanding the complexities of seal-fishery interactions in New England. In order to mitigate damage from depredation, it is important to know the source of the damage. Characteristics of seal and spiny dogfish bites were identified using foam imprints from jaws and bites by captive animals in the soft tissue of fish. Measurements from bite imprints and damaged fish were used to develop a protocol for identifying damage in the field. In general, dogfish bites were clean (flesh completely removed), circular in shape, and wider than long (bite ratio (bite length/bite width) 0.6), whereas seal bites were ragged (flesh not completely removed, but partially torn from the bite), retangular or trapezoidal in shape, and usually longer than wide or equal in length and width (bite ratio 0.7). This protocol was used to identify damaged catch observed on a commercial gill-net fishing vessel targeting skate in New England waters June - August 2014. In this small-scale study, dogfish bites were identified as the damage source significantly more frequently than seal bites (Multifactor ANOVA: F [subscript, degree of freedom]=2,66 = 9.306, p=0.0003; Tukey HSD: p
Download or read book Feeding Ecology of the Northwest Atlantic Grey Seal Halichoerus Grypus microform written by Donald Benoit and published by National Library of Canada. This book was released on 1989 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grey Seal Halichoerus Grypus Distribution During 1983 84 in the Gulf of St Lawrence as Observed by Aerial Survey written by Canada. Department of Fisheries and Oceans and published by . This book was released on 1985 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Second World Ocean Assessment written by United Nations Publications and published by UN. This book was released on 2021-09-22 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In its resolutions 57/141 and 58/240, the General Assembly decided to establish a regular process under the United Nations for global reporting and assessment of the state of the marine environment, including socioeconomic aspects, both current and foreseeable, building on existing regional assessments. In its resolution 71/257, the Assembly recalled that the scope of the first cycle of the Regular Process focused on establishing a baseline and decided that the scope of the second cycle would extend to evaluating trends and identifying gaps. The programme of work for the period 2017-2020 of the second cycle of the Regular Process includes the preparation by the Group of Experts of the Regular Process for Global Reporting and Assessment of the State of the Marine Environment, including Socioeconomic Aspects, of the second World Ocean Assessment, building on the baselines established by the First Global Integrated Marine Assessment (first World Ocean Assessment). In its resolution 72/73, the Assembly decided that the Group of Experts should proceed on the basis of a single comprehensive assessment. The present document was prepared by the Group of Experts in accordance with those decisions"--Summary.
Download or read book Biosonar written by Annemarie Surlykke and published by Springer. This book was released on 2014-07-19 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two groups of animals, bats and odontocetes (toothed whales), have independently developed the ability to orient and detect prey by biosonar (echolocation). This active mechanism of orientation allows these animals to operate under low light conditions. Biosonar is a conceptual overview of what is known about biosonar in bats and odontocetes. Chapters are written by bat and odontocetes experts, resulting in collaborations that not only examine data on both animals, but also compare and contrast mechanisms. This book provides a unique insight that will help improve our understanding of biosonar in both animal groups.
Download or read book Pinnipeds and El Ni o written by Fritz Trillmich and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Niño is a meteorological and oceanographic phenomenon, which occurs at irregular intervals in the eastern tropical Pacific. Its most obvious characteristic is the warming of surface waters, which causes enormous disturbances of the marine environment. A severe Niño may also affect continental systems worldwide. This book gathers in a comprehensive way the information available on the effects of the exceptionally strong 1982-83 Niño on a group of marine mammals, the pinnipeds. It presents an analysis of the effects of environmental stress on the populations of top predators. Data and interpretations are based on a most unusual collection of long-term studies of pinniped population dynamics, behavior and ecology which spanned the El Niño event. The responses of pinniped populations to the El Niño disturbance of the marine ecosystem also has important implications for the management and conservation of marine mammal populations.
Download or read book Draft Eis written by United States Environmental Protection Agency (EPA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-15 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Draft Eis
Download or read book The Migration Ecology of Birds written by Ian Newton and published by Elsevier. This book was released on 2023-12-02 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Migration Ecology of Birds, Second Edition covers all aspects of this absorbing subject, including migratory processes, problems of navigation and vagrancy, timing and physiological control of migration, large-scale movement patterns, the effects of recent climate change, the problems that migrants face, and the factors that limit their populations. This book provides a thorough and in-depth review of the state of the science, with the text supplemented by abundant tables, maps and diagrams. Written by a world-renowned avian ecology and migration researcher, this book reveals the extraordinary adaptability of birds to the variable and changing conditions across the globe. This book represents the most updated and detailed review of bird migration, its evolution, ecology and bird physiology. Written in a clear and readable style, it will appeal not only to migration researchers in the field and ornithologists, but to anyone with an interest in this fascinating subject. - Features updated and trending ecological aspects, including various types of bird movements, dispersal and nomadism, and how they relate to food supplies and other external conditions - Contains numerous tables, maps, diagrams, a glossary, and a bibliography of more than 3,000 up-to-date references - Written by an active researcher with a distinguished career in avian ecology, including migration research
