Download or read book Seasonal Changes in the Distribution and Abundance of Pacific Harbor Seals Phoca Vitulina Richardii in South Humboldt Bay California and Its Newly Enacted Marine Protected Area written by Wiley Hall Archibald and published by . This book was released on 2015 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harbor seals have been listed as a species likely to benefit from new Marine Protected Areas (MPAs) in California as part of the Marine Life Protection Act. Whereas seals may experience direct and indirect effects from these MPAs as a whole, the impacts of individual MPAs remains unclear. To support the analysis of the impacts of one new MPA located in South Humboldt Bay (SHB), California, I conducted two studies to measure the site fidelity of individual harbor seals within SHB and to describe the changes in distribution and abundance of hauled-out seals inside and outside the new MPA there. From June 2011 through May 2012, I used radio telemetry to assess site fidelity of 28 individually tagged seals. Most seals had high fidelity (>75%) for SHB haul-outs, indicating that these seals are present enough to potentially benefit from added protection. However, the use of radio telemetry proved difficult and costly for long-term data collection. Therefore, weekly visual surveys were implemented beginning in July 2012 to track the habitat use of all seals hauled-out in SHB. There were significant seasonal differences in seal abundance (ANOVA, F5 = 4.047, p
Download or read book Seasonal Abundance Distribution and Ecology of the Harbor Seal Phoca Vitulina Richardsi on San Miguel Island California written by Brent S Stewart and published by . This book was released on 1981 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Seasonal Movements and Abundance Dynamics of the Pacific Harbor Seal Phoca Vitulina Richardsi Along the Southern Oregon Coast written by Michael Turner Wilson and published by . This book was released on 1993 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Abundance and Distribution for Pacific Harbor Seal Phoca Vitulina Richardsi on the Coast of California written by Doyle Alan Hanan and published by . This book was released on 1996 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Predictors of Habitat Use Patterns of Pacific Harbor Seals Phoca Vitulina Richardii in an Urbanized Estuary written by Emma Kathryn Grigg and published by . This book was released on 2008 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Foraging Behavior of the Pacific Harbor Seal Phoca Vitulina Richardsi in Humboldt Bay California written by Aicha M. Ougzin and published by . This book was released on 2013 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coastal ecosystems are under intense pressure from anthropogenic and environmental factors in California. Human development, pollution and climate change continue to degrade coastal habitats. Marine predators such as marine mammals that depend on nearshore ecosystems are at risk from these anthropogenic and environmental factors. The Pacific harbor seal (Phoca vitulina richardsi) is one of the most common marine mammals along the coast of northern California and likely to be heavily impacted by changes in the coastal environment, yet little is known about their foraging behavior or habitat use. To accurately predict the response of local marine predators to changes in the coastal environment an understanding of their foraging behavior is required.
Download or read book Foraging Ecology Diving Behavior and Migration Patterns of Harbor Seals Phoca Vitulina Richardii from a Glacial Fjord in Alaska in Relation to Prey Availability and Oceanographic Features written by Jamie Neil Womble and published by . This book was released on 2012 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the movement behavior and foraging strategies of individuals across multiple spatial and temporal scales is essential not only for understanding the biological requirements of individuals but also for linking individual strategies to population level effects. Glacial fjords scattered throughout south-central and southeastern Alaska host some of the largest seasonal aggregations of harbor seals (Phoca vitulina richardii) in the world, and an estimated 15% of the harbor seal population in Alaska is found seasonally at these glacial ice sites. Over the last two decades, the number of harbor seals has declined at two of the primary glacial fjords, in Aialik Bay in south-central Alaska and in Glacier Bay in southeastern Alaska, thus raising concerns regarding the viability of seal populations in glacial fjord environments. From 2004-2009, the foraging ecology, diving behavior, and migration patterns of harbor seals from Glacier Bay National Park, Alaska were examined in relation to prey availability and oceanographic features in Glacier Bay and the surrounding regions of southeastern Alaska. Time-depth recorders, very high frequency transmitters, and satellite-linked transmitters were used to quantify the vertical and horizontal movement patterns of harbor seals in the marine environment. Specifically, (1) I characterized the diving behavior, foraging areas, and foraging strategies of female harbor seals from terrestrial and glacial ice sites relative to prey availability during the breeding season (May-June) in Glacier Bay, (2) I quantified the intra-population variation in at-sea post-breeding season (September-April) distribution and movement patterns of female harbor seals in relation to oceanographic features, (3) I quantified the post-breeding season migration patterns of female harbor seals relative to the boundaries of the marine protected area of Glacier Bay National Park, and (4) I characterized the use of the continental shelf region of the eastern Gulf of Alaska by female harbor seals from Glacier Bay, both as a foraging area and as a migratory corridor in relation to oceanographic features. During the breeding season, there was a substantial degree of intra-population variation in the diving behavior and foraging areas of juvenile and adult female seals from glacial ice and terrestrial sites in Glacier Bay. The presence of multiple diving strategies suggests that differences in the relative density and depth of prey fields in glacial ice and terrestrial habitats in addition to seal age and reproductive status may influence diving and foraging behavior of harbor seals. During the post-breeding season, juvenile and adult female harbor seals ranged extensively beyond the boundaries of the marine protected area of Glacier Bay National Park, throughout the northern inshore waters of southeastern Alaska and the continental shelf region of the eastern Gulf of Alaska between Cross Sound and Prince William Sound, Alaska (up to 900 kilometers away). Seals exhibited a relatively high degree of intra-population variation in their at-sea post-breeding season distribution patterns that may be a function of extrinsic factors such as oceanographic characteristics, which can influence prey availability as well as intrinsic factors including previous experience with foraging areas and seal condition and age. Use of the continental shelf region of the eastern Gulf of Alaska by harbor seals as a foraging area may be due to enhanced biological productivity which may be associated with ephemeral hydrographic and/or static bathymetric features. Despite extensive migrations of seals from Glacier Bay during the post-breeding season, there was a high degree of inter-annual site fidelity of seals to Glacier Bay the following breeding season after seals were captured.
Download or read book Seasonal Abundance Movements and Food Habits of Harbor Seals Phoca Vitulina Richardsi in Elkhorn Slough California written by Dion Seth Oxman and published by . This book was released on 1995 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Sea level Rise and Storm Surge on Pacific Harbor Seal Habitat written by Karen Eileen Backe and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Patterns and changes in the distribution of marine mammals can serve as indicators of environmental change. These indicators fill critical information gaps in coastal and marine environments. Coastal habitats are particularly vulnerable to the effects of near- term sea-level rise. In California, Pacific harbor seals (Phoca vitulina richardii) are a natural indicator species of coastal change due to their abundance, wide distribution, and site fidelity. Pinnipeds are marine top predators, and relatively easily observed on land at terrestrial habitats, called haul-outs, essential for resting, pupping, and molting. Increasing inundation from sea-level rise and storm driven flooding have already changed the California coastline. However, little is known about how sea-level rise and increases in storms will alter harbor seal haul-out availability and quality in California. We modeled harbor seal habitat at two typical sand bar-built estuaries under a series of likely sea-level rise and storm scenarios. The primary findings of these scenarios reveal that, over time, habitat at both estuaries decreased with increasing sea-level, and storm enhanced water levels contributed significantly to habitat flooding.
Download or read book Pacific Harbor Seal Phoca Vitulina Richardsi Monitoring at Point Reyes National Seashore and Golden Gate National Recreation Area 2008 Annual Report written by National Park Service and published by CreateSpace. This book was released on 2013-09-13 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pacific harbor seals (Phoca vitulina richardsi) are the dominant and only year-round resident pinniped in the San Francisco Bay Area, California. Long-term monitoring studies have been conducted at the largest harbor seal colonies in Point Reyes National Seashore since the mid 1970's. The objectives of monitoring each site and the population as a whole are to i) detect changes in population size, ii) detect changes in reproductive success by way of pup production, and iii) identify anthropogenic or environmental factors that may affect the condition of the population (Adams et al. In Prep).
Download or read book Status Review written by John L. Sease and published by . This book was released on 1992 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Movements and Home Ranges of Harbor Seals Phoca Vitulina in the Inland Waters of the Pacific Northwest written by Sarah E. Hardee and published by . This book was released on 2008 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal and Site Variations in Diets of Harbor Seals Phoca Vitulina Richardsi in Northern California written by Kevin Shaffer and published by . This book was released on 1989 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behavior and Ecology of Harbor Seals Phoca Vitulina Richardsi Inhabiting Glacial Ice in Aialik Bay Alaska written by Agnes Anne Hoover and published by . This book was released on 1983 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Behavior and Distribution of the Pacific Harbor Seal Phoca Vitulina Richardsi at Point San Pedro San Mateo County California written by Kurt C. Heinonen and published by . This book was released on 1985 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harbor Seal Phoca Vitulina Richardii Distribution and Abundance in the Bering Sea written by Robert D. Everitt and published by . This book was released on 1979 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Between June 1975 and July 1977 six aerial surveys were conducted along the eastern Aleutian Islands and northern Alaska Peninsula to determine the seasonal distribution and abundance of the land breeding harbor seal ... as part of the Alaska Outer Continental Shelf Environmental Assessment Program ..."--Page 389.
Download or read book Pacific Harbor Seal Phoca Vitulina Richardsi Census in California During May July 2004 written by Mark S. Lowry and published by . This book was released on 2005 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: An aerial photographic census of Pacific harbor seals (Phoca vitulina richardsi) was conducted in California 18 May-19 July 2004 to document the number of seals hauled out during the molt period. To compensate for latitudinal differences in the timing of the molt, the state of California was divided into three sections and each section was surveyed on different dates. The three sections were: (1) Channel Islands and mainland coast of southern California from the U.S./Mexico border to Pismo Beach, (2) central California from Pismo Beach to Point Reyes and San Francisco Bay estuary, and (3) northern California from Point Reyes to the California/Oregon border. Aerial photographic surveys at the Channel Islands and the mainland coast of southern California occurred during the afternoon high-low tide cycle on 18-20 May and 1-3 June at tide levels of 0.43 m to 0.88 m and 0.40 m to 0.73 m, respectively. Surveys in central California occurred during the low-low tide cycle at tide levels of -0.03 m to 0.49 m on 22-25 June. Surveys in northern California occurred during the low-low tide cycle at tide levels of -0.34 m to 0.43 m on 5-9 July and 18-19 July (except at South Humboldt Bay, Eel River, and Cape Mendocino where tide levels were 0.49 m to 0.52 m, 0.89 m, and 0.98 m, respectively). Color transparency photographs of harbor seals were taken with a 126-mm-format camera equipped with image motion compensation. The latitude and longitude of each photograph was recorded by linking the camera to a computer and Global Positioning System (GPS). Two to three observers searched for hauled-out seals. Seals were photographed as the aircraft was flown over the coastline at 213 m (700 ft). A total of 563 haulout sites within the state of California were found during complete surveys conducted at a mean tide level of 0.28 m (-0.46 m to 0.98 m). At the Channel Islands there were 4,344 seals counted onshore, along the mainland coast of California and San Francisco Bay estuary there were 21,989, and statewide there were 26,333. The mainland coast of California was stratified into nineteen 0.5-degree latitude segments with counts from the San Francisco Bay estuary making up the twentieth stratum. Stratum 37.50E to 37.99E had the most seals (n = 3,360) and the most seals at a single haulout site (n = 939). Stratum 40.50E to 40.99E had the highest median (104) and mean (178.4) number of seals per haulout. Of the eight Channel Islands in southern California, Santa Cruz Island had the most seals (n =1,102) and Santa Barbara Island the fewest (n = 12). Total 2004 counts were greater than 2002 counts at mainland sites, but counts at the Channel Islands were relatively stable.
