Download or read book Factors Influencing Blue Whale Aggregations Off Southern Sri Lanka written by Asha De Vos and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated] Blue whales (Balaenoptera musculus) inhabiting the Northern Indian Ocean are thought to comprise a distinct population or even potentially a different subspecies. Elsewhere, blue whales migrate long distances between lower latitude wintering grounds and higher latitude summer feeding grounds. Northern Indian Ocean blue whales, however, are thought to reside in tropical waters year-round including Sri Lankan waters. They have been documented engaging in courtship displays and as mother-calf pairs. They are also observed defaecating and in aggregations typical of feeding areas. The presence and colouration of the scats is good indication that these whales feed on euphausiids in these low latitude waters. Blue whales are found relatively close to the southern coast of Sri Lanka, an area subject to seasonally reversing monsoonal currents, and where a deep submarine canyon incises the narrow, steep continental shelf. A combination of satellite imagery, field data and numerical modelling were used to examine the physical processes and their potential influence on the distribution of blue whales. The study defined the circulation patterns around Sri Lanka in order to provide an explanation for the year-round, elevated chlorophyll levels along the southern coast. The numerical model also elucidated a previously undocumented shorter period of sporadic upwelling off southern Sri Lanka during the Northeast monsoon. The major upwelling region is located along the south coast and is shown to be due to flow convergence and divergence associated with offshore transport of water. The location of the upwelling centre was dependent on the relative strengths of wind driven flow along the east and west coasts.
Download or read book Blue Whale Ecology and Behavior in a Human impacted Marine Ecosystem written by Angela Renee Szesciorka and published by . This book was released on 2021 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: To avoid missing peak prey abundances, blue whales must detect available environmental cues and time migration by shifting arrival or departure dates to/from feeding grounds and balancing the time they spend foraging versus breeding. Blue whale feeding habitat overlaps with dense vessel traffic, making them vulnerable to vessel strikes--the leading cause of human mortality for blue whales off Southern California. Any changes to migration timing that increase residence time on the feeding grounds may increase vessel strike risk. The contextual factors influencing vessel strike risk are poorly understood and uncertainty remains about whale behavioral response to vessels. Understanding those interactions is important in preventing vessel strikes. Here, I investigated the timing and drivers of blue whale migration and blue whale-vessel interactions using seafloor- and animal-mounted acoustic devices. This allowed me to (a) examine the relationship among migration timing (inferred from blue whale "D" and "B" calls), environmental indices (e.g., sea surface temperature anomalies), and prey (spring krill biomass from annual net tow surveys) during a 10 year period (2008-2017) off Southern California and (b) assess vessel, environmental, and whale contextual variables associated with 216 close passages (2 km) between 174 vessels and 35 tagged whales and look for differences and uniqueness in dive behavior resulting from close passages. Colder sea surface temperature anomalies the previous season were correlated with greater krill biomass the following year, and earlier arrival by blue whales, demonstrating a plastic response of whales to interannual variability and the importance of krill as a driving force behind migration timing. By the end of the 10-year period, whales were arriving at the feeding grounds more than one month earlier, suggesting climate change has led to blue whales extending their overall time in Southern California. None of the contextual variables showed any relationship with close passage distance with vessels. Whales did not leave the area, even when passages were chronic (5/day), and we found no evidence of behavioral response. With no evidence of behavioral responses to close vessel passages, we need to continue managing vessel traffic under the assumption that whales do not avoid vessels.
Download or read book The Stocks of Whales written by Neil Alison Mackintosh and published by . This book was released on 1965 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dolphins Whales and Porpoises written by Randall R. Reeves and published by IUCN. This book was released on 2003 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Regional Impacts of Climate Change written by Intergovernmental Panel on Climate Change. Working Group II. and published by Cambridge University Press. This book was released on 1998 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cambridge, UK : Cambridge University Press, 1998.
Download or read book Marine Mammals written by Peter G.H. Evans and published by Springer Science & Business Media. This book was released on 2001-12-31 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of marine mammal science has made enormous strides in the last ten years as well as attracting a large amount of interest, due no doubt to the public appeal of whales, dolphins, and seals, which are never out of media attention. The purpose of this book is to review key topics through chapters on the major disciplines from invited authorities around the world. Subjects covered include evolution and genetics, life histories, ecology, physiology, behaviour, medicine (diseases, parasitology), survey methodology, and all the main conservation issues (pollution, fisheries interactions, and sound disturbance). The book has an ecological and conservation emphasis since these are subject areas calling for the most attention in the modern world, but other areas such as evolution, physiology, and medicine are also given in-depth treatment. The book is written at the level of the undergraduate or above, although its style should appeal to anyone with a serious interest in marine mammal science.
Download or read book Livestock s Long Shadow written by Henning Steinfeld and published by Food & Agriculture Org.. This book was released on 2006 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The assessment builds on the work of the Livestock, Environment and Development (LEAD) Initiative"--Pref.
Download or read book Puget Sound Notes written by and published by . This book was released on 1985 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ocean Noise and Marine Mammals written by National Research Council and published by National Academies Press. This book was released on 2003-05-22 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the 119 species of marine mammals, as well as for some other aquatic animals, sound is the primary means of learning about the environment and of communicating, navigating, and foraging. The possibility that human-generated noise could harm marine mammals or significantly interfere with their normal activities is an issue of increasing concern. Noise and its potential impacts have been regulated since the passage of the Marine Mammal Protection Act of 1972. Public awareness of the issue escalated in 1990s when researchers began using high-intensity sound to measure ocean climate changes. More recently, the stranding of beaked whales in proximity to Navy sonar use has again put the issue in the spotlight. Ocean Noise and Marine Mammals reviews sources of noise in the ocean environment, what is known of the responses of marine mammals to acoustic disturbance, and what models exist for describing ocean noise and marine mammal responses. Recommendations are made for future data gathering efforts, studies of marine mammal behavior and physiology, and modeling efforts necessary to determine what the long- and short-term impacts of ocean noise on marine mammals.
Download or read book Impacts of climate change on fisheries and aquaculture written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2019-01-06 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report indicates that climate change will significantly affect the availability and trade of fish products, especially for those countries most dependent on the sector, and calls for effective adaptation and mitigation actions encompassing food production.
Download or read book Lost from Our Landscape written by John Woinarski and published by Department of Natural Resources Environment and the Arts. This book was released on 2007 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Threatened Species in the Northern Territory- plants, invertebrates, fish, frogs, reptiles, birds, mammals.
Download or read book Local Knowledge Matters written by Nugroho, Kharisma and published by Policy Press. This book was released on 2018-07-04 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Available Open Access under CC-BY-NC licence. This book explores the critical role that local knowledge plays in public policy processes as well as its role in the co-production of policy relevant knowledge with the scientific and professional communities. The authors consider the mechanisms used by local organisations and the constraints and opportunities they face, exploring what the knowledge-to-policy process means, who is involved and how different communities can engage in the policy process. Ten diverse case studies are used from around Indonesia, addressing issues such as forest management, water resources, maritime resource management and financial services. By making extensive use of quotes from the field, the book allows the reader to ‘hear’ the perspectives and beliefs of community members around local knowledge and its effects on individual and community life.
Download or read book The 2030 Spike written by Colin Mason and published by Routledge. This book was released on 2013-06-17 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: The clock is relentlessly ticking! Our world teeters on a knife-edge between a peaceful and prosperous future for all, and a dark winter of death and destruction that threatens to smother the light of civilization. Within 30 years, in the 2030 decade, six powerful 'drivers' will converge with unprecedented force in a statistical spike that could tear humanity apart and plunge the world into a new Dark Age. Depleted fuel supplies, massive population growth, poverty, global climate change, famine, growing water shortages and international lawlessness are on a crash course with potentially catastrophic consequences. In the face of both doomsaying and denial over the state of our world, Colin Mason cuts through the rhetoric and reams of conflicting data to muster the evidence to illustrate a broad picture of the world as it is, and our possible futures. Ultimately his message is clear; we must act decisively, collectively and immediately to alter the trajectory of humanity away from catastrophe. Offering over 100 priorities for immediate action, The 2030 Spike serves as a guidebook for humanity through the treacherous minefields and wastelands ahead to a bright, peaceful and prosperous future in which all humans have the opportunity to thrive and build a better civilization. This book is powerful and essential reading for all people concerned with the future of humanity and planet earth.
Download or read book Wildlife in a Changing World written by Jean-Christophe Vié and published by IUCN. This book was released on 2009 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Wildlife in a Changing World" presents an analysis of the 2008 IUCN Red List of Threatened Species. Beginning with an explanation of the IUCN Red List as a key conservation tool, it goes on to discuss the state of the world s species and provides the latest information on the patterns of species facing extinction in some of the most important ecosystems in the world, highlighting the reasons behind their declining status. Areas of focus in the report include: freshwater biodiversity, the status of the world s marine species, species susceptibility to climate change impacts, the Mediterranean biodiversity hot spot, and broadening the coverage of biodiversity assessments."
Download or read book Odontocetes written by Boris M. Culik and published by UN. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Toothed whales occur in a wide range of marine and freshwater habitats, from the Arctic to the tropics. Some species live in large river systems such as the Amazon, Ganges, Indus and Yangtze. This encyclopedia on all 72 species of toothed whales includes the most recent scientific findings on the distribution, migration, behaviour and threats to this group of whales.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1983 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.
