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Marine mammals of the world : a comprehensive guide to their identification
With coverage on all the marine mammals of the world, authors Jefferson, Webber, and Pitman have created a user-friendly guide to identify marine mammals alive in nature (at sea or on the beach), dead specimens \"in hand\", and also to identify marine mammals based on features of the skull. This handy guide provides marine biologists and interested lay people with detailed descriptions of diagnostic features, illustrations of external appearance, beautiful photographs, dichotomous keys, and more. Full color illustrations and vivid photographs of every living marine mammal species are incorporated, as well as comprehendible maps showing a range of information. For readers who desire further consultation, authors have included a list of literature references at the end of each species account. For an enhanced understanding of habitation, this guide also includes recognizable geographic forms described separately with colorful paintings and photographs. All of these essential tools provided make Marine Mammals of the World the most detailed and authoritative guide available! * Contains superb photographs of every species of marine mammal for accurate identification * Authors' collective experience adds up to 80 years, and have seen nearly all of the species and distinctive geographic forms described in the guide * Provides the most detailed and anatomically accurate illustrations currently available * Special emphasis is placed on the identification of species in \"problem groups,\" such as the beaked whales, long-beaked oceanic dolphin, and southern fur seals * Includes a detailed list of sources for more information at the back of the book.
eBook
Estimating the stock size of harbor seals (Phoca vitulina richardii) in the inland waters of Washington State using line-transect methods
Harbor seals ( Phoca vitulina richardii ) in the inland waters of Washington were reduced by predator control programs in the twentieth century, but stocks have rebounded since being protected in the 1970s. Three management stocks are recognized, but there is little information on their current abundance. We conducted 38,431 km of aerial line-transect surveys throughout the range of these stocks in 2013–2016, sighting a total of 4,678 groups of harbor seals. Line-transect analysis with Beaufort sea state as a covariate provided estimates of the number of seals in the water. We then incorporated tagging data from 15 instrumented seals to develop correction factors, both for seals missed in the water while diving, and those that were on shore. Tagging data were modeled with generalized linear mixed models to provide estimates of the proportions diving and hauled out. After applying these correction factors, we estimated that the Hood Canal stock contained 1,368 seals (CV = 16.8%), the Southern Puget Sound stock contained 1,976 seals (CV = 20.5%), and the Washington Northern Inland Waters stock contained 7,513 seals (CV = 11.5%). This study presents a non-traditional approach to estimating the size of Washington inland waters harbor seal stocks, which may also be applicable to other species for which survey and tagging data are available.
Journal Article
الديمقراطية الثورية : كيف بنيت أميركا جمهورية الحرية
يتحدث هذا الكتاب عن الديمقراطية الثورية كيف بنيت أميركا جمهورية الحرية تأليف توماس جيفرسن حيث أي أسس قامت عليها أميركا؟ وأي رؤى زرعت بذور التقدم الحضاري والمدني وقدمت صيغة متطورة لإنسان المدينة الجديدة؟ وفي كتاب توماس جيفرسن \"الديموقراطية الثورية\" أطروحات رجل دولة نصوص ومسودات ورسائل كتبها لقياديين أوروبيين وشركاء في تحقيق استقلال الولايات المتحدة من الاحتلال البريطاني طارحا أفكارا في السياسة والاقتصاد والتشريع وآراء في الحريات والأخلاق تبقى على مدى أكثرمن قرنين من الزمن شيئا جديدا تحت الشمس.
BOOK
The Papers of Thomas Jefferson, Retirement Series, Volume 19
A definitive new volume of the retirement papers of
Thomas Jefferson This volume's 601 documents show
Jefferson dealing with various challenges. He is injured in a fall
at Monticello, and his arm is still in a sling months later when he
narrowly escapes drowning during a solitary horseback ride.
Jefferson obtains temporary financial relief by transferring a
$20,000 debt from the Bank of the United States to the College of
William and Mary. Aided by a review of expenditures by the
University of Virginia that uncovers no serious discrepancies,
Jefferson and the Board of Visitors obtain a further $60,000 loan
that permits construction to begin on the Rotunda. Jefferson drafts
but apparently does not send John Adams a revealing letter on
religion. He exchanges long letters discussing the Supreme Court
with Justice William Johnson, and he writes to friends about
France's 1823 invasion of Spain. Jefferson also helps prepare a
list of recommended books for the Albemarle Library Society. In
November 1822, Jefferson's grandson Francis Eppes marries Mary
Elizabeth Randolph. He gives the newlyweds his mansion at Poplar
Forest and visits it for the last time the following May. In a
letter to James Monroe, Jefferson writes and then cancels \"my race
is near it's term, and not nearer, I assure you, than I wish.\"
eBook
Afghanistan : a cultural and political history
Traces the political history of Afghanistan from the sixteenth century to the present, looking at what has united the people as well as the regional, cultural, and political differences that divide them.
Book
Revised taxonomy of eastern North Pacific killer whales ( Orcinus orca ): Bigg’s and resident ecotypes deserve species status
Killer whales ( Orcinus orca ) are currently recognized as a single ecologically and morphologically diverse, globally distributed species. Multiple morphotypes or ecotypes have been described, often associated with feeding specialization, and several studies have suggested taxonomic revision to include multiple subspecies or species in the genus. We review the ecological, morphological and genetic data for the well-studied ‘resident’ and Bigg’s (aka ‘transient’) ecotypes in the eastern North Pacific and use quantitative taxonomic guidelines and standards to determine whether the taxonomic status of these killer whale ecotypes should be revised. Our review and new analyses indicate that species-level status is justified in both cases, and we conclude that eastern North Pacific Bigg’s killer whales should be recognized as Orcinus rectipinnus (Cope in Scammon, 1869) and resident killer whales should be recognized as Orcinus ater (Cope in Scammon, 1869).
Journal Article
Effects of Coastal Construction on Indo-Pacific Humpback Dolphin (Sousa chinensis) Behavior and Habitat-Use Off Hong Kong
Construction-related loss of habitat, degradation of existing habitat, noise pollution, and vessel activity are growing issues for Indo-Pacific humpback dolphins ( Sousa chinensis ) that occur in the shallow, near-shore, highly industrialized waters off Lantau Island, Hong Kong. We studied the occurrence of dolphins in discrete locations, fine-scale movement patterns, and dolphin behavioral activity states. Potential explanatory variables varied and included year, season, time of day, dolphin group size and behavioral activity state, proximity to construction activity, and vessel type and number. Land-based observations and theodolite tracking of dolphins and vessels were conducted from seven locations to the north of Lantau Island, Hong Kong, and marine construction activities near survey sites were identified. A total of 636 groups of dolphins were recorded, totaling 150.91 h of tracking, from 405 days of observation effort. Hurdle models were used to analyze dolphin occurrence, multivariate generalized additive models were used to analyze fine-scale movement patterns, and log-likelihood ratio and binomial z score post hoc tests were used to analyze behavioral activity states. Dolphin occurrence was lower in historically important areas near long-term, low-intensity construction activity, and dolphin swimming speed was higher in response to vessel presence. Overall, foraging and traveling were the most frequently observed behavioral activity states and resting behavior was observed off only one location that was not in proximity to construction activities. Temporal overlap in adjacent marine construction areas may displace animals for extended periods and nearby ecologically similar habitats should be identified and designated as marine protected areas to mitigate effects of such disturbance.
Journal Article