Download or read book Age and Stage Based Analysis of the Population Dynamics of Beluga Whales Delphinapterus Leucas with Particular Reference to the Northern Quebec Population written by David William Doidge and published by . This book was released on 1990 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The age-length data used to evaluate errors associated with stage classification indicate that belugas in Hudson Bay are smaller than those elsewhere, but not to the large degree previously reported. Beluga in estuaries are represented by all size classes. Examination of the integumentary heat loss show beluga and narwhal, Monodon monoceros, to be equally insulated, but only belugas frequent warmer estuarine waters." --
Download or read book Studies of White Whales Delphinapterus Leucas and Narwhals Monodon Monoceros in Greenland and Adjacent Waters written by and published by Museum Tusculanum Press. This book was released on 1994 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fishery Bulletin written by and published by . This book was released on 2000 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1994 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Aquatic Toxicity Workshop written by and published by . This book was released on 1993 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Belugas in the North Atlantic and the Russian Arctic written by Mads-Peter Heide-Jørgensen and published by . This book was released on 2002 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forty third Report of the International Whaling Commission written by Commission baleinière internationale and published by . This book was released on 1993 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of the International Whaling Commission written by International Whaling Commission and published by . This book was released on 1991 with total page 584 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 1993 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detecting Changes in Population Trends for Cook Inlet Beluga Whales Delphinapterus Leucas Using Alternative Schedules for Aerial Surveys written by Roderick C. Hobbs and published by . This book was released on 2013 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Measuring population trends, and detecting a change in the trend, of Cook Inlet beluga whales (CIB), Delphinapterus leucas, has a specific role in the co-management agreement that determines harvest levels, and a more general application in the management of the population. Currently, an annual aerial survey schedule has provided abundance estimates from which growth trends for this population are determined. Under the harvest co-management agreement, the measured trend over a 10-year period is used to classify the population into one of three growth categories ('high', 'intermediate', or 'low'; Appendix). The growth category, along with the average abundance over the last 5-year period, is used to determine the number of takes allowed over the next 5-year hunting period (Appendix). For a more general application, we would like to be able to detect a change in the growth rate of the population that results from a change in the underlying life history parameters such as birth interval and rates of survival and identify the year that the change occurred"--Introduction.
Download or read book Approaches to Understanding the Cumulative Effects of Stressors on Marine Mammals written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-05-04 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine mammals face a large array of stressors, including loss of habitat, chemical and noise pollution, and bycatch in fishing, which alone kills hundreds of thousands of marine mammals per year globally. To discern the factors contributing to population trends, scientists must consider the full complement of threats faced by marine mammals. Once populations or ecosystems are found to be at risk of adverse impacts, it is critical to decide which combination of stressors to reduce to bring the population or ecosystem into a more favorable state. Assessing all stressors facing a marine mammal population also provides the environmental context for evaluating whether an additional activity could threaten it. Approaches to Understanding the Cumulative Effects of Stressors on Marine Mammals builds upon previous reports to assess current methodologies used for evaluating cumulative effects and identify new approaches that could improve these assessments. This review focuses on ways to quantify exposure-related changes in the behavior, health, or body condition of individual marine mammals and makes recommendations for future research initiatives.
Download or read book Population Genetics of Hudson Bay Beluga Whales Delphinapterus Leucas written by Samuel John Mancuso and published by . This book was released on 1995 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Beluga Whales written by Anthony R. Martin and published by . This book was released on 2002 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dr Anthony Martin is a biologist and in this book he explores what we know about the beluga or white whale, and relates to the reader what research is currently being carried out on this species.
Download or read book Age Growth Reproduction and Movements of Beluga Whales Delphinapterus Leucas from the Eastern Chukchi Sea written by Robert Scott Suydam and published by . This book was released on 2009 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Epidemiological Tools to the Conservation of an Endangered Species written by Stephanie A. Norman and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cook Inlet, Alaska belugas (CIB) (Delphinapterus leucas) are a genetically and geographically isolated wild stock, residing in the upper Inlet's waters year-round. This small, declining population was listed as endangered in 2008. Relatively little research has been conducted on diseases and environmental threats to this stock that may play a role in their decline and long-term viability. To date, impacts of disease, anthropogenic drivers, and environmental factors on population dynamics have not been well characterized. Four studies were conducted to help evaluate CIB health and survival threats: 1) characterization of hematology and serum chemistry values in Bristol Bay belugas (BBB), a healthy growing population, for comparison to CIB, 2) characterization of hematology and serum chemistry variation patterns from captive belugas over 22 years, to provide methods applicable to wild populations such as CIB, 3) development of a model using anthropogenic and environmental factors to demonstrate CIB population trajectories based on survival and fecundity rates in a simulated population, and 4) evaluation of fecal pathogens and contributing fecal host sources to surface waters and sediment in areas of upper CI that overlap critical beluga habitat. Results from the first study showed that mean hematocrit, chloride, creatinine, total protein (TP), albumin, and alkaline phosphatase were significantly lower in May than they were in September, whereas mean corpuscular hemoglobin concentration, monocytes, phosphorous, magnesium, blood urea nitrogen, alanine transaminase, aspartate aminotransferase, gamma glutamyl transferase, and creatinine kinase were significantly higher. Mean TP, white blood cell count, neutrophils, and lymphocytes were significantly higher early in the capture period than they were later. No significant differences in blood analyte values were noted between males and females. Usingoverall body length as a proxy for age, larger (older) belugas had lower white blood cell, lymphocyte, and eosinophil counts as well as lower sodium, potassium, and calcium levels but higher creatinine levels than smaller belugas. In this study, the most striking differences in analyte values for BBB were seasonal, and the analyte value variability noted for age and sex was similar to that seen in other studied wild beluga populations. Based on bloodwork values, BBB appeared to adapt to capture and handling. The BBB bloodwork established useful baselines for further monitoring of this population and future comparisons to BBB. Results from the second study, in which blood analyte variation was evaluated in a captive beluga population, demonstrated that many blood analytes differed based on whale sex and age. For many blood analytes, similar circannual variation patterns were observed across facility location, and seasonal variation was also observed. These findings from a long-term assessment of individual analyte variation in healthy cetaceans agree with previous reports that many blood analytes differ significantly between partitioning factors such as age groups and seasons. Age, seasonality, and sex were important determinants for a majority of the blood analytes, therefore, the variability of these variables should be accounted for when investigating health trends over time. The use of an age-structured population model to assess the impact of stressors on CIB fecundity and survival demonstrated that decreases in fecundity probability had a smaller effect on population growth compared to decreases in survival probability, for the same magnitude of modification. Results furthermore suggested that supplementing census data with age-structured modeling can improve the detection and projection of changes in survivorship and fecundity of endangered populations. The results from study three demonstrated an efficient and non-invasive method to help determine the magnitude of a stressor that would likely result in the observed decline of the CIB population that could also be applied to other populations. In addition, the results can identify hypothetical causes of the decline and what stressors justify additional resources for study. In the last study, determining fecal pathogen pollution patterns and sources, the most common host source fecal marker was human source, followed by the livestock marker that may also represent large wildlife hosts such as moose and deer. The prevalence of Giardia was greater than that for Cryptosporidium, overall and by matrix type. Salmonella was not detected. Vibrio was more prevalent in sediment than in water for both months. Norovirus was detected in water samples but not in sediment. The most prevalent fecal host source marker detected overall was human, followed by livestock. Human-host Bacteroidales marker prevalence was greatest in water both months, followed by livestock in water and canine and avian in sediment. Fecal coliform counts in surface waters were within Alaska water quality standards, and were 10-100x greater in sediment. In unadjusted regression analyses, water was found more likely to be positive for either protozoal organism compared to sediment. In the final study, the greatest contribution of tested fecal host-specific markers appeared to be from human sources. Exposure of belugas to pathogens in waters where they most often congregate and socialize should be a consideration. In addition, exposure of marine life and humans to potential fecal pathogens may be influenced by climatic and anthropogenic factors and should be considered when evaluating fecal monitoring programs. Findings from these studies will contribute to current knowledge of CIB health and aid conservation policy in terms of: management of endangered species; the integration of wildlife conservation with population health interventions; and applicability to other endangered or threatened marine life.
Download or read book Detecting Changes in Population Trends for Cook Inlet Beluga Whales Delphinapterus Leucas Using Alternative Schedules for Aerial Surveys written by Roderick C. Hobbs and published by . This book was released on 2013 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Measuring population trends, and detecting a change in the trend, of Cook Inlet beluga whales (CIB), Delphinapterus leucas, has a specific role in the co-management agreement that determines harvest levels, and a more general application in the management of the population. Currently, an annual aerial survey schedule has provided abundance estimates from which growth trends for this population are determined. Under the harvest co-management agreement, the measured trend over a 10-year period is used to classify the population into one of three growth categories ('high', 'intermediate', or 'low'; Appendix). The growth category, along with the average abundance over the last 5-year period, is used to determine the number of takes allowed over the next 5-year hunting period (Appendix). For a more general application, we would like to be able to detect a change in the growth rate of the population that results from a change in the underlying life history parameters such as birth interval and rates of survival and identify the year that the change occurred"--Introduction.
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.
