Download or read book Seasonal Distribution and Abundance of Marine Birds Part I Shipboard Surveys written by Calvin J. Lensink and published by . This book was released on 1976 with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal Distribution and Abundance of Marine Birds written by Calvin J. Lensink and published by . This book was released on 1976 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal Distribution and Abundance of Marine Birds written by Calvin J. Lensink and published by . This book was released on 1976 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Describes activites by U.S. Fish and Wildlife Service personnel related to shipboard surveys of marine birds in Alaskan waters during the two quarters from 1 January to 30 June 1976"--Leaf 1.
Download or read book The Seasonal Distribution and Abundance of Marine Bird Populations in the Strait of Juan de Fuca and Northern Puget Sound in 1978 written by David A. Manuwal and published by . This book was released on 1979 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution and Abundance of Marine Birds and Mammals Wintering in the Kodiak Area of Alaska written by Douglas J. Forsell and published by . This book was released on 1981 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forty-four species of seabirds and ten species of marine mammals were observed during the winter 1979-80 in the Kodiak Archipelago.
Download or read book Patterns of Distribution Abundance and Change Over Time in the Marine Bird Community of Prince William Sound Alaska 1989 2012 written by Daniel Arel Cushing and published by . This book was released on 2014 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over recent decades, the marine ecosystems of Prince William Sound (PWS), Alaska have experienced the concurrent effects of a major anthropogenic disturbance, the 1989 Exxon Valdez oil spill (EVOS), and a dynamic atmospheric-oceanic environment. Studies of top marine consumers can provide insights into processes of ecosystem change. Using data collected during boat-based marine bird surveys in PWS over the period 1989-2012, I used complimentary taxon- and community-centric approaches to investigate patterns of distribution and abundance of marine birds across space and time. In doing so, I sought to provide insight into processes that may have affected both the birds themselves and the ecosystems of which they are a part. I found that the marine bird community as a whole was spatially structured along a primary onshore-offshore environmental gradient, and secondarily structured along an estuarine-marine environmental gradient. I found two patterns of community variability across time. The first temporal community-level pattern was likely related to sustained rates of change in the abundance of some genera, likely caused by demographic processes. This pattern was correlated with climate variability at time-scales of several years to a decade. The second temporal community-level pattern was characterized by fluctuations that correlated with climate variability at an annual time-scale, likely caused by movements of birds between PWS and the adjacent Gulf of Alaska. I also evaluated changes in the abundance of 18 genera of marine birds, and found that seven had declined in abundance and three had increased over the study period; all genera that declined were piscivorous or planktivorous. Furthermore, the rates of population change of genera were related to their position in the onshore-offshore gradient, with the highest rates of decline occurring in offshore-associated genera. I also investigated spatial habitat associations and temporal changes in abundance of a focal taxon, the seabird genus Brachyramphus. Two species within this piscivorous, pursuit-diving genus occur in PWS, the marbled murrelet (B. marmoratus) and the Kittlitz's murrelet (B. brevirostris). Both are species of conservation concern, and both experienced acute mortality in PWS caused by the EVOS. Using a statistical model that accounted for variables affecting observed abundance across space and time, I found that abundance decreased by more than two-thirds over the study period. I found no evidence that rates of change differed along environmental or geographic gradients. There was also no evidence that changes in seasonal patterns of abundance occurred. These results are indicative of a widespread decline in the abundance of Brachyramphus murrelets within PWS. Taken as a whole, the results of my thesis are consistent with the hypothesis that climate change has differentially affected nearshore and offshore components of PWS food webs. This in turn has likely contributed to the failure of some taxa, including Brachyramphus murrelets, to recover from population injury caused by the EVOS.
Download or read book Comprehensive Bibliography written by and published by . This book was released on 1988 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Bibliography written by Outer Continental Shelf Environmental Assessment Program and published by . This book was released on 1984 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Bird Distribution and Abundance Off Southern California written by Karl David Hyrenbach and published by . This book was released on 2001 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CENFOR written by United States. Bureau of the Census and published by . This book was released on 1971 with total page 1326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1980 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arctic Bulletin written by and published by . This book was released on 1978 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: One issue each year devoted to the annual report.
Download or read book The Distribution and Abundance of Marine Birds and Mammals in the Gulf of the Farallones and Adjacent Waters 1985 1992 written by Sarah Gardner Allen and published by . This book was released on 1996 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Monitoring of Marine Bird Abundance and Habitat Associations During Fall and Winter in Prince William Sound written by Anne Louise Schaefer and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Study on the seasonal variation in abundance of marine birds in Prince William Sound during the fall and winter seasons. The study also looks at predator-prey relationships during the non-breeding season.
Download or read book Environmental Assessment of the Alaskan Continental Shelf written by and published by . This book was released on 1977 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inventory of Federal Energy related Environment and Safety Research for written by and published by . This book was released on 1980 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inventory of Federal Energy related Environment and Safety Research for FY 1979 written by and published by . This book was released on 1980 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
