Download or read book The Effects of Acoustic Detterent Devices on Harbour Porpoise Phocoena Phocoena and Seals in the Vicinity of Fish Farms in the Orkneys Scotland written by Frances Charlotte Robertson and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Sounds Generated by an Acoustic Deterrent Device on the Abundance and Distribution of Harbour Porpoise Phocoena Phocoena in Retreat Passage British Columbia written by Peter F. Olesiuk and published by . This book was released on 1996 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment was conducted to assess the effect of sounds generated by an acoustic deterrent device on harbor porpoises in Retreat Passage, B.C. Abundance declined precipitously when the device was activated. The mean number of porpoise resightings while tracking their movements also declined. The urgency of this experiment lies in the widespread use of acoustic deterrent devices by the aquaculture industry. In British Columbia these devices are used to control seals, which prey on salmon at salmon farms. The new generation of these devices emit frequencies to which cetacean hearing is most sensitive. The potential adverse effects has received attention, particularly in light of observations suggesting the harbor porpoise is not as abundant on the British Columbia coast as it once was.
Download or read book Reducing incidental catch in fisheries written by A. Alexa Kershaw and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of the Impacts and Utility of Acoustic Deterrent Devices written by Simon P. Northridge and published by . This book was released on 2010 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Use of Acoustic Methods for the Protection of Harbour Porpoises Phocoena Phocoena in German Waters written by Michael Dähne and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detecting and Assessing Trends in Harbour Porpoise Phocoena Phocoena Presence in and Near the Force Test Site written by Peter H. J. Porskamp and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Current tidal energy development activities at a test facility, Fundy Ocean Research Centre for Energy (FORCE), in Minas Passage, a high flow site in the upper Bay of Fundy, include examination of potential effects of tidal turbines on commonly occurring harbour porpoises, Phocoena phocoena (Linnaeus, 1758). Prior visual observations and passive acoustic monitoring (using C-PODs) of harbour porpoise were conducted over multiple years in spring, summer and fall. The present study focused on filling the winter and early spring seasonal gap in baseline data. Harbour porpoise presence (detected via echolocation clicks) was assessed at established monitoring sites in and near the FORCE test area during December 2013 - June 2014. Descriptive results indicated that harbour porpoise use Minas Passage year-round but with low presence during the winter months. The full multi-year dataset was used to develop a new statistical model (GAM/GEE) of spatio-temporal trends in harbour porpoise use of the FORCE area. It showed two seasonal peaks in harbour porpoise presence with the largest peak in late spring (June) and a second in the fall (October). It also showed trends with diel cycle (greater activity at night), tidal height (greater presence near high tide), tidal velocity and flow direction. Instrument performance tests were also conducted and included assessments of hydrophone performance using tethered buoys and a stationary instrument platform, tests of hydrophone shrouding, and assessments of hydrophone detection range at FORCE. These studies have implications for both tidal energy development and conservation of harbour porpoises. They will inform best practices in monitoring harbour porpoises at high flow sites and will enhance our ability to detect potential effects on harbour porpoises of turbine installation and operation at FORCE.
Download or read book Analysis of the Effects on Harbour Porpoises from the Underwater Sound During Thec Onstruction of the Borssele and Gemini Offshore Wind Farms written by C.A.F. de Jong and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of underwater noise on marine mammals during the piling of foundations for offshore wind farms (platforms and wind turbines) are currently estimated on the basis of exceeding threshold values for the exposure of the animals to underwater noise. This is done through the Ecology and Cumulation Framework (KEC).This study, commissioned by the Wozep program of Rijkswaterstaat, provides more insight into the response of harbour porpoises to pile-driving noise and into the relationship between pile-driving noise and the behavioural response. Based on the data from acoustic monitoring during the construction of the Borssele wind farms in 2019 and 2020 and during the construction of the Gemini wind farms in 2015, it was investigated which acoustic metric (weighted or not weighted for the various species-specific frequency-dependent hearing sensitivity) best explains behavioural changes in the harbour porpoise. Statistical analysis of the detection of porpoise echolocation sounds (porpoise positive minutes measured by CPOD equipment) as a function of the distance from the pile, shows that porpoises are detected less often during pile driving at distances of at least 7 km near Borssele, where the pile-driving noise had to remain within a noise limit, and up to at least 15 km at Gemini, where no noise limit was yet applicable. These distances are considerably smaller than calculated (50% probabilityof disturbance at a distance of approximately 30 km) based on the current KEC methodology.The analysis of the detection of harbour porpoise echolocation sounds as a functionof unweighted and weighted single strike sound exposure level of the piling hits (SELSS) shows various threshold values above which harbour porpoises are detected less often. Due to the applied mitigation measures and masking by ambient noise, it was not possible to determine the SELSS values at Borssele over the same frequency bandwidth as at Gemini. Therefore, the dose-effect relationships are not comparable. The logical assumption that a measure weighted for the hearing sensitivity of animals gives a better prediction for the behavioural response than an unweighted measure is not immediately confirmed by the analysis of the measurement data from the Borssele and Gemini projects.The study also shows that there are problems with the practical implementation of frequency-weighted SELSS, due to the uncertainty in both modelling and measurement of the high-frequency components of pile-driving noise, where ambient noise masks high-frequency pile-driving noise.The measurements at Borssele, where pile-driving noise has been mitigated and where busy shipping results in a high level of background noise, show that it is not always clear whether pile-driving noise is the main source of disturbance.The analysis of the detection of harbor porpoise echolocation sounds as a function ofthe unweighted and weighted sound level (SPL) of the underwater sound at Borssele and Gemini shows a clear shows a clear decrease in detections with increasing SPL values. That suggests that SPL may be a more complete measure for predicting behavioral response than SELSS. However, predicting the total SPL as a result ofall sources requires more information and models than are available, which means that this measure is not yet directly applicable for effect studies.
Download or read book Variability in Reactions of Harbour Porpoises Phocoena Phocoena and Atlantic Grey Seals Halichoerus Grypus to Boat Disturbance Around Ramsey Island South West Wales written by Neda I. Trifonova and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Baseline Data on the Harbour Porpoise Phocoena Phocoena in Relation to the Intended Wind Farm Site NSW in the Netherlands written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To evaluate the possible impact of the planned Near Shore Wind farm on harbour porpoises, a baseline study has been carried out to provide a thorough description of the ecological reference situation. Three methods were used to collect baseline data on harbour porpoise in the intended wind farm area as well as reference areas. Firstly, during a whole year echolocation sounds of the animals were collected via fixed hydrophones, so-called T-PODs. This will provide information on relative density of porpoises. Secondly, bi-monthly ship-surveys were conducted to obtain an estimate for density. Finally, hydrophones were towed behind the survey ship to corroborate the visual data. These studies proved that porpoises frequently occurred in the target area and also in the control sites. Intensity of the porpoise activity was clearly higher in winter months. Observations surpass the expectations with respect to the amount of animals and recording
Download or read book Salmon Ranching written by John E. Thorpe and published by . This book was released on 1980 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effectiveness of a Sealscarer in Deterring Harbour Porpoises Phocoena Phocoena and Its Application as a Mitigation Measure During Offshore Pile Driving written by and published by . This book was released on 2012 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook on Marine Environment Protection written by Markus Salomon and published by Springer. This book was released on 2018-01-31 with total page 1001 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is the first of its kind to provide a clear, accessible, and comprehensive introduction to the most important scientific and management topics in marine environmental protection. Leading experts discuss the latest perspectives and best practices in the field with a particular focus on the functioning of marine ecosystems, natural processes, and anthropogenic pressures. The book familiarizes readers with the intricacies and challenges of managing coasts and oceans more sustainably, and guides them through the maze of concepts and strategies, laws and policies, and the various actors that define our ability to manage marine activities. Providing valuable thematic insights into marine management to inspire thoughtful application and further study, it is essential reading for marine environmental scientists, policy-makers, lawyers, practitioners and anyone interested in the field.
Download or read book Marine Renewable Energy written by Zhaoqing Yang and published by Springer. This book was released on 2017-04-24 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This complete reference to marine renewable energy covers aspects of resource characterization and physical effects of harvesting the ocean’s vast and powerful resources—from wave and tidal stream to ocean current energy. Experts in each of these areas contribute their insights to provide a cohesive overview of the marine renewable energy spectrum based on theoretical, numerical modeling, and field-measurement approaches. They provide clear explanations of the underlying physics and mechanics, and give close consideration to practical implementation aspects, including impacts on the physical system. Engineers, researchers, and students alike will find invaluable tools and studies that will aid them in realizing significant sustainable energy production from near-shore and ocean environments.
Download or read book Energy for Sustainable Development written by Md Hasanuzzaman and published by Academic Press. This book was released on 2019-06-15 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy for Sustainable Development: Demand, Supply, Conversion and Management presents a comprehensive look at recent developments and provides guidance on energy demand, supply, analysis and forecasting of modern energy technologies for sustainable energy conversion. The book analyzes energy management techniques and the economic and environmental impact of energy usage and storage. Including modern theories and the latest technologies used in the conversion of energy for traditional fossil fuels and renewable energy sources, this book provides a valuable reference on recent innovations. Researchers, engineers and policymakers will find this book to be a comprehensive guide on modern theories and technologies for sustainable development. Uniquely covers Energy Demand, Supply, Conversion and Management in one complete reference Offers relevant information for both undergraduate and postgraduate programs on energy conversion, making it a key reference for study Includes extensive coverage that links energy conversion with efficiency and management through storage, savings, economics and environmental impact
Download or read book Maritime Spatial Planning written by Jacek Zaucha and published by Springer. This book was released on 2018-01-01 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is open access under a CC BY 4.0 license Maritime or marine spatial planning has gained increasing prominence as an integrated, common-sense approach to promoting sustainable maritime development. A growing number of countries are engaged in preparing and implementing maritime spatial plans: however, questions are emerging from the growing body of MSP experience. How can maritime spatial planning deal with a complex and dynamic environment such as the sea? How can MSP be embedded in multiple levels of governance across regional and national borders – and how far does the environment benefit from this new approach? This open access book is the first comprehensive overview of maritime spatial planning. Situated at the intersection between theory and practice, the volume draws together several strands of interdisciplinary research, reflecting on the history of MSP as well as examining current practice and looking towards the future. The authors and contributors examine MSP from disciplines as diverse as geography, urban planning, political science, natural science, sociology and education; reflecting the growing critical engagement with MSP in many academic fields. This innovative and pioneering volume will be of interest and value to students and scholars of maritime spatial planning, as well as planners and practitioners. Jacek Zaucha is Professor of Economics at Gdánsk University, Poland. He is long experienced in maritime spatial planning, and is currently leading the team preparing the first plan for Polish waters. Kira Gee is Research Associate at the Centre for Materials and Coastal Research (Helmholtz-Zentrum Geesthacht), Germany. She has been involved in MSP research and practice for over 20 years, and has participated in numerous national and transnational European MSP projects.
Download or read book Applied Underwater Acoustics written by Thomas Neighbors and published by Elsevier. This book was released on 2017-01-19 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Underwater Acoustics meets the needs of scientists and engineers working in underwater acoustics and graduate students solving problems in, and preparing theses on, topics in underwater acoustics. The book is structured to provide the basis for rapidly assimilating the essential underwater acoustic knowledge base for practical application to daily research and analysis. Each chapter of the book is self-supporting and focuses on a single topic and its relation to underwater acoustics. The chapters start with a brief description of the topic's physical background, necessary definitions, and a short description of the applications, along with a roadmap to the chapter. The subtopics covered within individual subchapters include most frequently used equations that describe the topic. Equations are not derived, rather, assumptions behind equations and limitations on the applications of each equation are emphasized. Figures, tables, and illustrations related to the sub-topic are presented in an easy-to-use manner, and examples on the use of the equations, including appropriate figures and tables are also included. - Provides a complete and up-to-date treatment of all major subjects of underwater acoustics - Presents chapters written by recognized experts in their individual field - Covers the fundamental knowledge scientists and engineers need to solve problems in underwater acoustics - Illuminates, in shorter sub-chapters, the modern applications of underwater acoustics that are described in worked examples - Demands no prior knowledge of underwater acoustics, and the physical principles and mathematics are designed to be readily understood by scientists, engineers, and graduate students of underwater acoustics - Includes a comprehensive list of literature references for each chapter
Download or read book Dolphin Societies written by Karen Pryor and published by Univ of California Press. This book was released on 1991 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey of current dolphin research.
