Download or read book The physiological consequences of breath hold diving in marine mammals the Scholander legacy written by Andreas Fahlman and published by Frontiers E-books. This book was released on with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Breath-hold diving marine mammals are able to remain submerged for prolonged periods of time and dive to phenomenal depths while foraging. A number of physiological, biochemical and behavioral traits have been suggested that enable this life style, including the diving response, lung collapse, increased O2 stores, diving induced hypometabolism, and stroke-and-glide behavior to reduce dive metabolic cost. Since the initial studies by Scholander in the 1940‘s, when most of the physiological and biochemical traits were suggested, few have received as much study as the diving response and O2 management. The calculated aerobic dive limit (cADL) was an important concept which allowed calculation of the aerobic dive duration, and was defined as the total O2 stores divided by the rate of O2 consumption (metabolic rate). The total O2 stores have been defined for several species, and studies in both forced and freely diving animals have refined the metabolic cost of diving. Currently there appears to be little consensus about whether marine mammals perform a significant proportion of dives exceeding the cADL or not and there may be large differences between species. The diving response is a conserved physiological trait believed to arise from natural selection. The response includes diving-induced bradycardia, peripheral vasoconstriction, and altered blood flow distribution. While the response results in reduced cardiac work, it is not clear whether this is required to reduce the overall metabolic rate. An alternate hypothesis is that the primary role of the diving bradycardia is to regulate the degree of hypoxia in skeletal muscle so that blood and muscle O2 stores can be used more efficiently. Scholander suggested that the respiratory anatomy of marine mammals resulted in alveolar collapse at shallow depths (lung collapse), thereby limiting gas exchange. This trait would limit uptake of N2 and thereby reduce the risk of inert gas bubble formation and decompression sickness. In his initial treatise, Scholander suggested that alveolar collapse probably made inert gas bubble formation unlikely during a single dive, but that repeated dives could result in significant accumulation that could be risky. Despite this, lung collapse has been quoted as the main adaptation by which marine mammals reduce N2 levels and inert gas bubble formation. It was surprising, therefore, when recent necropsy reports from mass stranded whales indicated DCS like symptoms. More recent studies have shown that live marine mammals appear to experience bubbles under certain circumstances. These results raise some interesting questions. For example, are marine mammals ever at risk of DCS, and if so could N2 accumulation limit dive performance? While an impressive number of studies have provided a theoretical framework that explains the mechanistic basis of the diving response, and O2 management, many questions remain, some widely-accepted ideas actually lack sufficient experimental confirmation, and a variety of marine mammal species, potentially novel models for elucidating new diving adaptations, are understudied. The aim of this Frontiers Topic is to provide a synthesis of the current knowledge about the physiological responses of marine mammals that underlie their varied dive behavior. We also include novel contributions that challenge current ideas and that probe new hypotheses, utilize new experimental approaches, and explore new model species. We show that the field has recently entered a phase of renewed discovery that is not only unraveling more secrets of the natural diving response but will drive new applications to aid human exploration of the ocean depths. We also welcome comparative analyses, especially contributions that compare marine mammals with human divers.
Download or read book Diving Physiology of Marine Mammals and Seabirds written by Paul J. Ponganis and published by Cambridge University Press. This book was released on 2015-11-26 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date synthesis of comparative diving physiology research, illustrating the features of dive performance and its biomedical and ecological relevance.
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 2017-06-04 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 The Physiology of Dolphins written by Andreas Fahlman and published by Elsevier. This book was released on 2023-11-25 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physiology of Dolphins explains complex physiological problems of dolphins that are largely driven by technological developments of biologging tools. The book provides a collection of review chapters from leaders in the field of dolphin ecophysiology, making it essential for instructors, researchers and graduate students interested in the physiological and anatomical adaptations that make life possible for this charismatic marine mammal. Sections cover the complete physiology of the mammal and include information on the current threats for dolphins and whales from environmental pressures such as climate change, overfishing, pollution and our increasing human presence in the ocean. This is an excellent reference providing easy to follow details of the latest available research methods and technologies that is expanding the field of physiology in marine mammals. Describes complex physiological themes such as the neural control of the dive response and how compression affects gas exchange Includes studies of the cardiorespiratory and sensory physiology of wild dolphins and other cetacean species Incorporates diagrams, and other visual representations to best describe these complex systems and activities
Download or read book Marine Mammal Physiology written by Michael A. Castellini and published by CRC Press. This book was released on 2015-11-18 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suppose you were designing a marine mammal. What would you need to think about to allow it to live in the ocean? How would you keep it warm? What would you design to allow it to dive for very long periods to extreme depths? Where would it find water to drink? How would you minimize the cost of swimming, and how would it find its prey in the deep and dark? These questions and more are examined in detail throughout this book. Marine Mammal Physiology: Requisites for Ocean Living is the first textbook focused on how marine mammals live in the sea from a physiological point of view. It explores the essential aspects of what makes a marine mammal different from terrestrial mammals, beyond just their environment. Unlike many publications and books that cover these species from almost all perspectives, this textbook takes a step back to focus on the physiological and biochemical characteristics that have allowed these mammals as a group to exploit effectively the marine environment that is so hostile to humans. The chapter topics are grouped into major themes: diving and locomotion, nutrition and energetics, reproduction, sensory systems, and environmental interactions. Each chapter is arranged around a common perspective and theme: the big picture challenge and summary and what is known specifically by order. To aid you even further, the authors include a "Toolbox" section in each chapter where they discuss the newest methods for understanding and working on the physiology of marine mammals.
Download or read book Diving and Asphyxia written by Robert Elsner and published by Cambridge University Press. This book was released on 1983-07-21 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book concerns the comparative physiological adaptations of vertebrate animals, especially mammals, to cessation of breathing.
Download or read book Physiology and Physiopathology of Breath Holding Activity written by Frederic Lemaitre and published by Frontiers Media SA. This book was released on 2022-03-14 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Mammals written by Randall W. Davis and published by Springer Nature. This book was released on 2019-11-14 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book provides new insights into the morphological, metabolic, thermoregulatory, locomotory, diving, sensory, feeding, and sleep adaptations of Cetacea (whales and dolphins), Pinnipedia (seals, sea lions and walrus), Sirenia (manatees and dugongs) and sea otters for an aquatic life. Each chapter reviews the discoveries from previous studies and integrates recent research using new techniques and technology. Readers will gain an understanding of the remarkable adaptations that enable marine mammals to spend all or most of their lives at sea, often while hunting prey at depth.
Download or read book Ecology and Behaviour of Free Ranging Animals Studied by Advanced Data Logging and Tracking Techniques written by Thomas Wassmer and published by Frontiers Media SA. This book was released on 2020-06-15 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physiology of Diving in Man and Other Animals written by H. V. Hempleman and published by Hodder Education. This book was released on 1978 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mammals of the Sea written by Sam H. Ridgway and published by . This book was released on 1972 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Future of Diving written by Michael A. Lang and published by . This book was released on 2009 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The symposium was convened by the Baromedical and Environmental Physiology Group of Norwegian University of Science and Technology in Trondheim, Norway, on 18-19 December 2008."-- Verso t.p.
Download or read book Pattern and Process in Macroecology written by Kevin Gaston and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues of scale have become increasingly important to ecologists. This book addresses the structure of regional (large-scale) ecological assemblages or communities, and the influence this has at a local (small-scale) level. This macroecological perspective is essential for the broader study of ecology because the structure and function of local communities cannot be properly understood without reference to the region in which they are situated. The book reviews and synthesizes the issues of current importance in macroecology, providing a balanced summary of the field that will be useful for biologists at advanced undergraduate level and above. These general issues are illustrated by frequent reference to specific well-studied local and regional assemblages -- an approach that serves to relate the macroecological perspective (which is perhaps often difficult to comprehend) to the everyday experience of local sites. Macroecology is an expanding and dynamic discipline. The broad aim of the book is to promote an understanding of why it is such an important part of the wider program of research into ecology. Summarises the current macroecological literature. Provides numerous examples of key patterns. Explicitly links local and regional scale processes. Exploits detailed knowledge of one species assemblage to explore broad issues in the structuring of biodiversity.
Download or read book The Journal of Experimental Biology written by and published by . This book was released on 2008-11 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Joy of Science written by Richard A. Lockshin and published by Springer Science & Business Media. This book was released on 2007-11-05 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reveals that scientific logic is an extension of common, everyday logic and that it can and should be understood by everyone. Written by a practicing and successful scientist, it explores why questions arise in science and looks at how questions are tackled, what constitutes a valid answer, and why. The author does not bog the reader down in technical details or lists of facts to memorize. He uses accessible examples, illustrations, and descriptions to address complex issues. The book should prove enlightening to anyone who has been perplexed by the meaning, relevance, and moral or political implications of science.
Download or read book Diving Science written by Michael B. Strauss and published by Human Kinetics. This book was released on 2004 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text blends theoretical and scientific aspects with practical and directly applicable diving physiology and medical information. It is divided into three sections - the underwater environment, physiological responses to the underwater environment, and medical problems associated with the sport.
Download or read book Diverse Divers written by Gerald L. Kooyman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is not a conventional review of diving physiology. The coverage of the literature has been selective rather than en compassing, the emphasis has been on field studies rather than laboratory investigations, and the dive responses described are often discussed from the perspective of some of the flaws or weaknesses in the conclusions. Some of these points are of more historical interest to note how our concepts have evolved as we learn more about behavior and responses to natural diving in contrast to forced submersions in the laboratory. As a result there is a degree of evaluation of some experiments on my part that may seem obvious or controversial to the specialist. I have followed this planat times in order to aid the reader, who I hope is often an untergraduate or graduate stu dent, the nonspecialist, and the layman, in appreciating to some degree the level of dissatisfaction or skepticism about certain areas of research in diving physiology. In view of historical boundaries in vertebrate biology, the subject is of broad enough importance to catch the interest of a wide audience of readers if I have done my job well. For ex ample, of the major epochal transitions or events there have been in vertebrate history, three come immediately to mind: (1) The transition from aquatic to aerial respiration which ultimately led to a broad occupation of terrestrial habitats. (2) The development of endothermy.
