Download or read book Migration Corridors of the California Gray Whale Eschrichtius Robustus and Assessment of Annual Calf Production and Mortality written by M. Michael Poole and published by . This book was released on 1984 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Gray Whale Eschrichtius Robustus written by Mary Lou Jones and published by Academic Press. This book was released on 2012-12-02 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Gray Whale: Eschrichtius robustus provides an introduction to the understanding of Eschrichtius robustus or the gray whale. This book explores the life processes, reproduction, and growth of large cetacean populations. Organized into four parts encompassing 25 chapters, this book begins with an overview of the gray whale evolution, fossils, and subfossil remains, range, and systematics in historical times. This text then presents the historical of gray whale exploitation and the economic importance of these whales to humans. Other chapters consider the gray whale migration, abundance, and seasonal distribution in the wake of the California population's recovery from depletion. This book discusses as well the methods used in shore-based censuses during migration and in aerial surveys of gray whales taken on their winter grounds. The final chapter deals with some innovative approaches to the study of free-ranging cetaceans. This book is a valuable resource for anthropologists, paleontologists, biologists, and naturalists.
Download or read book DRAFT ENVIRONMENTAL ASSESSMENT on ISSUING A QUOTA TO THE MAKAH INDIAN TRIBE FOR A SUBSISTENCE HUNT ON GRAY WHALES FOR THE YEARS 2001 AND 2002 written by and published by DIANE Publishing. This book was released on with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of the Commission International Whaling Commission written by International Whaling Commission and published by . This book was released on 1983 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Assessment and Population Dynamics of the California Gray Whale Eschrichtius Robustus written by Stephen Blake Reilly and published by . This book was released on 1982 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gray Whale Monitoring Study written by and published by . This book was released on 1989 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reproduction in Whales Dolphins and Porpoises written by William F. Perrin and published by . This book was released on 1984 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 40 papers arranged under the headings:-
Download or read book Latitudinal Distribution Calf Growth and Metabolsim and Reproductive Energetics of Gray Whales Eschrichtius Robustus written by James L. Sumich and published by . This book was released on 1986 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gray whales accomplish an annual migration which spans as much as 50° of latitude in the northeast Pacific Ocean. This migration links their summer high latitude feeding grounds with winter calving and breeding areas. The purpose of this study was to determine how adult females apportion their stored lipid reserves while away from their principal feeding areas to accommodate their own maintenance and locomotory needs while developing a fetus and transferring energy through lactation to support growth and maintenance of their calves. Major components of this study included examinations of migratory swimming speeds and costs of transport, of calf growth and mortality rates, of metabolic and heat loss rates, of summer distribution patterns, and of the magnitudes and utilization rates of maternal lipid reserves. The results of this study support the conclusions of other investigations that calf heat losses are similar to minimum observed metabolic rates, and that maintenance and lactation costs can be accommodated without winter feeding by all but the small adult females. It is suggested that present oceanographic conditions in the North Pacific Ocean support a larger gray whale population and allow very different gray whale feeding and migrating patterns than existed during the last glacial maximum.
Download or read book A Census of the California Gray Whale written by Raymond Maurice Gilmore and published by . This book was released on 1960 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Demography Migrations and Behavior of Gray Whales written by Steven Lindsay Swartz and published by . This book was released on 1986 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Oceanic Society Field Guide to the Gray Whale written by Ben Bennett and published by . This book was released on 1983 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Mammals Ashore written by Joseph R. Geraci and published by National Aquarium in Baltimore. This book was released on 2005 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive manual for understanding and carrying out marine mammal rescue activities for stranded seals, manatees, dolphins, whales, or sea otters.
Download or read book Distribution Numbers and Behavior of Gray Whales in the Channel Islands National Marine Sanctuary During the Southward Migration January 1987 written by Mary Lou Jones and published by . This book was released on 1988 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migrating Eastern North Pacific Gray Whale Behavior Compared Over Multiple Timescales written by Regina Anne Guazzo and published by . This book was released on 2018 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mysticetes (baleen whales) often make long, annual migrations from high latitude summer feeding areas to low latitude wintering areas. Eastern North Pacific gray whales (Eschrichtius robustus) migrate within a few kilometers from shore for most of their route from summer feeding areas in the Bering, Chukchi, and Beaufort Seas to wintering areas in the lagoons along the south-western coast of the Baja California Peninsula in Mexico. This dissertation combines passive acoustic recordings, infrared camera video, and visual sightings to investigate gray whale behavior and how it changes across different timescales. I use a four-element hydrophone array in central California to present the first published full-season acoustic monitoring and tracking of migrating gray whales. I describe the characteristics of calls produced by migrating gray whales and analyze how these characteristics change due to propagation. I show that gray whale behavior changes on diel and seasonal timescales. Notably, gray whales increase their vocalizations at night but their mean swimming behavior does not change, contrary to previous assumptions used in population size estimates. Over seasonal timescales, vocalizing gray whale swimming behavior aligns with previous observations. I explore how passive acoustic and infrared camera monitoring can help quantify whales by calculating cue rates or call and blow rates for migrating gray whales. Acoustic calling rates indicate that the gray whale population size is greater than estimated using visual sightings alone and that calling rate increases over the southbound migration. Infrared camera blow rates are less affected by whale behavior and are useful for daytime and nighttime monitoring, but are limited by visibility and distance. To understand gray whale behavior over seven migration seasons, I use visual daily counts at two sites and single-hydrophone call detections which indicate that migratory behavior seems to be driven more by intrinsic than the tested environmental factors. I find that the proportion of the population using a coastal route through the Southern California Bight, especially past Los Angeles, increased over these years. Understanding the behavior of migrating gray whales will help improve abundance estimates and determine how these whales may be impacted by nearshore anthropogenic activities and climate change.
Download or read book Day and Night Migration Rates of Radio Tagged Gray Whales Eschrichtius Robustus Along the Central California Coast written by Steven L. Swartz and published by . This book was released on 1987 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Re analysis of Gray Whale Southbound Migration Surveys 1967 2006 written by Jeffrey Lee Laake and published by . This book was released on 2009 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Between 1967 and 2007, 23 seasons of shore-based counts of the Eastern North Pacific (ENP) stock of gray whales (Eschrichtius robustus) were conducted throughout all or most of the southbound migration near Carmel, California. Population estimates have been derived from these surveys using a variety of techniques that were adapted as the data collection protocol evolved. The subsequent time series of estimates was used to evaluate trend and population status, resulting in the conclusion that the population was no longer endangered and had achieved its optimum sustainable population (OSP) level. We re-evaluated the data from all of the surveys using a common estimation procedure and an improved method for treatment of error in pod size and detection probability estimation. The newly derived abundance estimates between 1967 and 1987 were generally larger (-2.5% to 21%) than previous abundance estimates. However, the opposite was the case for survey years 1992 to 2006, with estimates declining from -4.9% to -29%. This pattern is largely explained by the differences in the correction for pod size bias which occurred because the pod sizes in the calibration data overrepresented pods of two or more whales and underrepresented single whales relative to the estimated true pod size distribution.
Download or read book Latitudinal Distribution Calf Growth and Metabolism and Reproductive Energetics of Gray Whales Eschrichtius Robustus written by James L. Sumich and published by . This book was released on 1995 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
