Download or read book Status of the Grey Seal Population in the Northwest Atlantic written by and published by . This book was released on 1983 with total page 0 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 Northwest Atlantic Grey Seal Population Trends 1960 2012 written by Michael O. Hammill and published by . This book was released on 2014 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimated Size of the Northwest Atlantic Grey Seal Population 1977 2010 written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Population Consequences of Harvest Strategies for the Northwest Atlantic Grey Seal Population written by Len Thomas and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimated Size of the Northwest Atlantic Grey Seal Population 1977 2007 written by L. Thomas and published by . This book was released on 2008 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Assessment of the Northwest Atlantic Grey Seal Halichoerus Grypus Population for 1983 written by Kees Cornelis Tieleman Zwanenburg and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This document outlines an assessment of the Northwest Atlantic grey seal (Halichoerus grypus) population. The primary data source was a long-term, large-scale and recapture experiment which was initiated in 1977. Each year since 1977 all pups whelped on Sable Island (Nova Scotia) have been marked. Returns of these marks, via a bounty system, have allowed for estimates of total population pup production since 1977"--Abstract, page 2.
Download or read book Evaluating Ecosystem Responses to Grey Seal Abundance Changes in the Southern Gulf of St Lawrence written by Steven Rossi and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Northwest Atlantic ecosystems have been dramatically altered in recent decades; groundfish were overfished to low abundance and have largely failed to recover, while marine mammals, particularly pinnipeds, have increased rapidly in abundance and have emerged as top predators. These large-scale ecosystem changes have created considerable uncertainties in the assessment of wildlife populations and the development of sustainable management strategies, which typically assume that populations are driven by stationary processes. Pinniped culls have been proposed in some ecosystems, such as the southern Gulf of St. Lawrence, to improve groundfish survival. However, the response of groundfish to reduced pinniped abundance is difficult to predict because, in some ecosystems, the effect of pinnipeds on groundfish survival is unknown, whereas, in other ecosystems, groundfish productivity may be indirectly impaired by reduced pinniped abundance due to improved survival for pelagic species that compete with and/or consume young groundfish. Over three research chapters, I investigate nonstationarity in NW Atlantic ecosystems, particularly considering the effect of grey seal abundance reductions on prospects for groundfish recovery. First, I use age-structured models with time-varying parameters to demonstrate that the recovery of two groundfish populations on Georges Bank is impaired by high rates of adult natural mortality. Next, I develop an integrated assessment model for Northwest Atlantic grey seals (Halichoerus grypus) and demonstrate that the growth of this population has slowed in recent decades due to density-dependent reductions in juvenile survival. Finally, I develop a multispecies model of pinniped/groundfish/pelagic dynamics in the southern Gulf of St. Lawrence and demonstrate that the recovery of Atlantic cod (Gadus morhua) in this ecosystem is unlikely in the absence of strong and rapid reductions to the grey seal population. I did not find evidence of strong indirect effects on cod survival via pelagics, as seal predation only accounted for a minor portion of pelagic mortality. Taken together, these chapters highlight the difficulties in evaluating responses to pinniped culls and suggest that actions aimed at recovering groundfish may need to be taken before the effects are thoroughly understood.
Download or read book Interactions in the Marine Benthos written by Stephen J. Hawkins and published by Cambridge University Press. This book was released on 2019-08-29 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive account of how abiotic and biotic interactions shape patterns of coastal marine biodiversity and ecosystem processes globally.
Download or read book Seals and Man written by William Nigel Bonner and published by University of Washington Press. This book was released on 1982 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the long and varied relationship of man and seals, including the effect of seals on fisheries and the impact of commercial fishing on seals. Also includes a chapter on seal biology, social structure, breeding and diet.
Download or read book Stock Assessment of Northwest Atlantic Grey Seals Halichoerus Grypus written by Canadian Science Advisory Secretariat and published by . This book was released on with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Historical Grey Seal Abundance and Changes in the Abundance of Grey Seal Predators in the Northwest Atlantic written by W. D. Bowen and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment of Northwest Atlantic Grey Seals Halichoerus Grypus written by Michael O. Hammill and published by . This book was released on 2008 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment of Northwest Atlantic Grey Seals Halichoerus Grypus written by and published by . This book was released on 2011 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Pup Production of Northwest Atlantic Grey Seals in the Gulf of St Lawrence written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Atlantic and Gulf of Mexico Marine Mammal Stock Assessments 2002 written by and published by . This book was released on 2002 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
