Article
Fisheries
Isabella Maria Friederike Kratzer, Daniel Stepputtis, Juan Santos, Frauke Luetkefedder, Arne Stoltenberg, Lea Hartkens, Matthias Schaber, Lotte Kindt-Larsen, Finn Larsen
Summary: This study investigates the use of small acrylic glass spheres attached to gillnets to increase their acoustic reflectivity and reduce incidental capture of small cetaceans. The results show that gillnets equipped with these spheres have higher acoustic backscattering strength, with the best performance observed when the sphere-sphere distance is 20 cm. The findings suggest that modifying gillnets with reflective spheres can be an effective way to reduce bycatch of small cetaceans.
FISHERIES RESEARCH
(2022)
Article
Ecology
Jamie Macaulay, Al Kingston, Alex Coram, Michael Oswald, Rene Swift, Doug Gillespie, Simon Northridge
Summary: A passive acoustic monitoring system was developed to track the behavior of harbour porpoises around fishing nets. By localizing their acoustic clicks, highly detailed 3D movement data can be obtained. The study revealed various behaviors of harbour porpoises in proximity to nets, including active foraging.
METHODS IN ECOLOGY AND EVOLUTION
(2022)
Article
Multidisciplinary Sciences
Kaitlin E. Frasier, Lance P. Garrison, Melissa S. Soldevilla, Sean M. Wiggins, John A. Hildebrand
Summary: The study demonstrates that combining various data types can improve the understanding of temporal and spatial distribution trends of cetacean populations in the Gulf of Mexico, with the use of stationary passive acoustic monitoring data significantly enhancing predictive capabilities.
SCIENTIFIC REPORTS
(2021)
Article
Ecology
Oliver Boisseau, Tessa McGarry, Simon Stephenson, Ross Compton, Anna-Christina Cucknell, Conor Ryan, Richard McLanaghan, Anna Moscrop
Summary: The study demonstrates that minke whales react clearly to signals at the upper limit of their hearing sensitivity, with the acoustic deterrent device causing whales to move away immediately and exhibit sustained movement away after deactivation.
MARINE ECOLOGY PROGRESS SERIES
(2021)
Article
Environmental Sciences
Christopher D. Lowe, Nicolas J. C. Tregenza, Claudia J. Allen, Georgina E. Blow, Hanna Nuuttila, Chiara M. Bertelli, Anouska F. Mendzil, Thomas Stamp, Emma Sheehan, Peter Davies, Jonathan C. D. Gordon, Jonathan D. Bolland, J. Robert Britton, Robert Main, Randolph Velterop, Charles Crundwell, Andrew Schofield, David R. K. Clarke
Summary: Aquatic biotelemetry relies on acoustic transmitters for passive detection of tagged animals. However, decoding these detections is currently not possible, leading to potential loss of valuable information on animal movements. This study presents a simple hybrid method for obtaining information from unused data sources.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Ecology
Mats Amundin, Julia Carlstrom, Len Thomas, Ida Carlen, Jonas Teilmann, Jakob Tougaard, Olli Loisa, Line A. Kyhn, Signe Sveegaard, M. Louise Burt, Iwona Pawliczka, Radomil Koza, Bartlomiej Arciszewski, Anders Galatius, Jussi Laaksonlaita, Jamie MacAuley, Andrew J. Wright, Anja Gallus, Michael Dahne, Alejandro Acevedo-Gutierrez, Harald Benke, Jens Koblitz, Nick Tregenza, Daniel Wennerberg, Katharina Brundiers, Monika Kosecka, Cinthia Tiberi Ljungqvist, Ivar Jussi, Martin Jabbusch, Sami Lyytinen, Aleksej Saskov, Penina Blankett
Summary: Knowing the abundance of a population is crucial for assessing its conservation status and developing effective conservation plans. This study estimated the abundance of the Baltic Proper harbour porpoise for the first time through passive acoustic monitoring and found that it is critically endangered. Immediate and efficient conservation actions through international cooperation are urgently needed.
ECOLOGY AND EVOLUTION
(2022)
Article
Ecology
Alli N. Cramer, Steve Katz, Clark Kogan, James Lindholm
Summary: Passive acoustic telemetry is a useful tool for tracking aquatic animals, but data interpretation has limitations. Researchers found that real-world telemetry observations cannot be distinguished from random walks during initial sampling, and they must consider study duration and organismal step size relative to detection radius.
MARINE ECOLOGY PROGRESS SERIES
(2021)
Article
Marine & Freshwater Biology
Marian Howe, Marc O. Lammers
Summary: The distribution of odontocetes on a daily scale is influenced by bottom-up processes which impact foraging opportunities. Environmental variables such as bathymetry can help indicate productive foraging regions. Study results from the MauiNui region show that smaller species have stronger acoustic activity at night, particularly closer to shelf waters, while larger species do not have a clear diel pattern except near shelf waters.
Article
Ecology
Rebecca V. Van Hoeck, Avery B. Paxton, DelWayne R. Bohnenstiehl, J. Christopher Taylor, F. Joel Fodrie, Charles H. Peterson
Summary: By comparing the soundscape and community development of two artificial reefs, passive acoustic monitoring was shown to be an effective complement to traditional monitoring methods, providing a more comprehensive view of community development.
Article
Biodiversity Conservation
Candice K. Emmons, M. Bradley Hanson, Marc O. Lammers
Summary: The study found that in the coastal waters of Washington State, northern resident populations of fish-eating killer whales mainly resided in locations near the strait, while southern resident populations were primarily distributed in nearshore locations. This research provides further insight into the habitat use of these resident killer whale populations with implications for their management and conservation.
ENDANGERED SPECIES RESEARCH
(2021)
Article
Acoustics
Athena M. Rycyk, Cora Berchem, Tiago A. Marques
Summary: This study evaluated the effectiveness of using vocal detections to estimate manatee abundance and found that vocalization counts can serve as strong predictors of manatee numbers, particularly in areas with clear water.
JASA EXPRESS LETTERS
(2022)
Article
Fisheries
Valentina Corrias, Giuseppe Andrea de Lucia, Francesco Filiciotto
Summary: This study investigated the soundscape of the Gulf of Oristano on the western coast of Sardinia, showing diurnal and seasonal variations. The main components of the soundscape were identified as biophony (dolphins' clicks and crustaceans' snapping) and anthropophony (vessel passages). The marine soundscape is an important tool for evaluating ecosystem management plans, habitat quality, and the impact of human activities.
MEDITERRANEAN MARINE SCIENCE
(2023)
Article
Ecology
Elisabeth Bru, Bethany R. Smith, Hannah Butkiewicz, Amy C. Fontaine, Angela Dassow, Jessica L. Owens, Holly Root-Gutteridge, Loretta Schindler, Arik Kershenbaum
Summary: This study demonstrates the use of acoustic localization and high-resolution land cover classification to study the ecology of vocalizing animals in the wild. The results show differences in vocal behavior between coyotes and wolves, with coyotes vocalizing closer to human features and wolves vocalizing further away. This method can be used for monitoring vocally active animals at larger scales.
Article
Marine & Freshwater Biology
Sara Konigson, Rahmat Naddafi, Maria Hedgarde, Alice Pettersson, Orjan Ostman, Emilia Benavente Norrman, Mats Amundin
Summary: Acoustic deterrents such as pingers have been successful in mitigating harbor porpoise bycatch, however, they may have negative consequences on seals. An experimental pinger emitting sounds with low frequency components potentially audible to seals only at close distances effectively deterred harbor porpoises without impacting seals. The study found that the porpoise response to the pinger was distance-dependent, with a significant decrease in activity at close distances.
MARINE MAMMAL SCIENCE
(2022)
Article
Ecology
Renan L. Paitach, Guilherme A. Bortolotto, Mats Amundin, Marta J. Cremer
Summary: Babitonga Bay is home to the only fully estuarine population of critically endangered Franciscana dolphins, but it also has a population of Guiana dolphins. Human activities and potential impacts in the area may pose threats to the dolphins. This study used acoustic data to investigate their habitat use and distribution, providing insights into critical habitats and behavioral patterns.
MARINE ECOLOGY PROGRESS SERIES
(2023)
Article
Marine & Freshwater Biology
Peter A. Thompson, Jacob Carstensen
Summary: Environmental changes caused by humans are pressuring the biosphere, particularly with limited monitoring and understanding of ocean ecosystems. This ignorance hampers reliable conclusions about the global ecological status and delays responses. These changes also disrupt the harvest of food resources and other ecosystem services vital to human well-being. Despite progress in designing a global monitoring program, there are significant gaps, hurdles, and challenges to overcome.
JOURNAL OF PLANKTON RESEARCH
(2023)
Article
Ecology
Mats Amundin, Julia Carlstrom, Len Thomas, Ida Carlen, Jonas Teilmann, Jakob Tougaard, Olli Loisa, Line A. Kyhn, Signe Sveegaard, M. Louise Burt, Iwona Pawliczka, Radomil Koza, Bartlomiej Arciszewski, Anders Galatius, Jussi Laaksonlaita, Jamie MacAuley, Andrew J. Wright, Anja Gallus, Michael Dahne, Alejandro Acevedo-Gutierrez, Harald Benke, Jens Koblitz, Nick Tregenza, Daniel Wennerberg, Katharina Brundiers, Monika Kosecka, Cinthia Tiberi Ljungqvist, Ivar Jussi, Martin Jabbusch, Sami Lyytinen, Aleksej Saskov, Penina Blankett
Summary: Knowing the abundance of a population is crucial for assessing its conservation status and developing effective conservation plans. This study estimated the abundance of the Baltic Proper harbour porpoise for the first time through passive acoustic monitoring and found that it is critically endangered. Immediate and efficient conservation actions through international cooperation are urgently needed.
ECOLOGY AND EVOLUTION
(2022)
Article
Biodiversity Conservation
Charmain D. Hamilton, Christian Lydersen, Jon Aars, Mario Acquarone, Todd Atwood, Alastair Baylis, Martin Biuw, Andrei N. Boltunov, Erik W. Born, Peter Boveng, Tanya M. Brown, Michael Cameron, John Citta, Justin Crawford, Rune Dietz, Jim Elias, Steven H. Ferguson, Aaron Fisk, Lars P. Folkow, Kathryn J. Frost, Dmitri M. Glazov, Sandra M. Granquist, Rowenna Gryba, Lois Harwood, Tore Haug, Mads Peter Heide-Jorgensen, Nigel E. Hussey, Jimmy Kalinek, Kristin L. Laidre, Dennis I. Litovka, Josh M. London, Lisa L. Loseto, Shannon MacPhee, Marianne Marcoux, Cory J. D. Matthews, Kjell Nilssen, Erling S. Nordoy, Greg O'Corry-Crowe, Nils oien, Morten Tange Olsen, Lori Quakenbush, Aqqalu Rosing-Asvid, Varvara Semenova, Kim E. W. Shelden, Olga V. Shpak, Garry Stenson, Luke Storrie, Signe Sveegaard, Jonas Teilmann, Fernando Ugarte, Andrew L. Von Duyke, Cortney Watt, Oystein Wiig, Ryan R. Wilson, David J. Yurkowski, Kit M. Kovacs
Summary: This study identified hotspots and areas of high species richness for Arctic marine mammals using biotelemetry data. The results can serve as a benchmark for measuring future distributional shifts and highlight differences in habitat features among species and regions. Gap analysis also revealed species and regions that require further research.
DIVERSITY AND DISTRIBUTIONS
(2022)
Review
Biodiversity Conservation
Dianne L. McLean, Luciana C. Ferreira, Jessica A. Benthuysen, Karen J. Miller, Marie-Lise Schlappy, Matthew J. Ajemian, Oliver Berry, Silvana N. R. Birchenough, Todd Bond, Fabio Boschetti, Ann S. Bull, Jeremy T. Claisse, Scott A. Condie, Pierpaolo Consoli, Joop W. P. Coolen, Michael Elliott, Irene S. Fortune, Ashley M. Fowler, Bronwyn M. Gillanders, Hugo B. Harrison, Kristen M. Hart, Lea-Anne Henry, Chad L. Hewitt, Natalie Hicks, Karlo Hock, Kieran Hyder, Milton Love, Peter I. Macreadie, Robert J. Miller, William A. Montevecchi, Mary M. Nishimoto, Henry M. Page, David M. Paterson, Charitha B. Pattiaratchi, Gretta T. Pecl, Joanne S. Porter, David B. Reeves, Cynthia Riginos, Sally Rouse, Debbie J. F. Russell, Craig D. H. Sherman, Jonas Teilmann, Victoria L. G. Todd, Eric A. Treml, David H. Williamson, Michele Thums
Summary: Offshore oil and gas infrastructure has an impact on ecological connectivity in marine habitats, particularly for larvae and mobile animals. However, there is still a lack of knowledge on the specific effects of oil and gas structures on ecological connectivity, which requires further research. When decommissioning oil and gas infrastructure, it is important to consider the impact on species survival, movement, and distribution.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Ecology
Floris M. van Beest, Rune Dietz, Anders Galatius, Line Anker Kyhn, Signe Sveegaard, Jonas Teilmann
Summary: Understanding how environmental and climate change can affect habitat overlap of marine predators is crucial for managing and conserving marine ecosystems. A study in the southwestern Baltic Sea found that habitat suitability for Baltic gray seals will decline, while harbor seals will be mildly affected, and harbor porpoises will experience a slight increase in suitability over time and space. Inter-specific overlap in highly suitable habitats is expected to change as well.
ECOLOGY AND EVOLUTION
(2022)
Article
Multidisciplinary Sciences
Philippine Chambault, Kit M. Kovacs, Christian Lydersen, Olga Shpak, Jonas Teilmann, Christoffer M. Albertsen, Mads Peter Heide-Jorgensen
Summary: Ocean warming has led to shifts in the distribution of Arctic cetaceans, with whales expected to move farther north in response to climate change. Summer habitats are projected to decline, while some expansion in winter areas may occur. However, concerns arise regarding the ability of these polar species to adapt to the disappearance of traditional colder habitats.
Article
Oceanography
Jenny A. Huggett, Margaux Noyon, Jacob Carstensen, David R. Walker
Summary: Copepods dominate the zooplankton community on the Agulhas Bank and provide an important food resource for pelagic fish. Previous studies have focused on one dominant copepod species, Calanus agulhensis, but little is known about other copepod taxa on the bank. In this study, the spatio-temporal variability of copepod biomass and species composition on the Agulhas Bank over a 24-year period was analyzed. Results showed that the copepod community has changed over time, with a significant decline in copepod biomass. The decline is likely influenced by top-down predation pressure from pelagic fish.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2023)
Article
Multidisciplinary Sciences
Charlotte R. Findlay, Laia Rojano-Donate, Jakob Tougaard, Mark P. Johnson, Peter Teglberg Madsen
Summary: Global reductions in underwater radiated noise levels from cargo vessels are necessary to mitigate the accumulative impacts on marine wildlife. By utilizing a vessel exposure simulation model, we demonstrate that reducing vessel source levels through slowdowns and technological modifications can significantly decrease the area exposed to ship noise. Furthermore, despite the longer duration it takes for a slower vessel to pass an animal, slowdowns effectively mitigate all impacts to marine mammals. Hence, we suggest implementing speed reductions as an immediate solution to reduce cumulative noise impacts, which can be scalable from local areas to global ocean basins. Additionally, routing vessels away from critical habitats and employing technological modifications to minimize vessel noise can further supplement these efforts.
Article
Microbiology
Iben Stokholm, Christine Baechlein, Sara Persson, Anna Roos, Anders Galatius, Line Anker Kyhn, Signe Sveegaard, Charlotte Bie Thostesen, Morten Tange Olsen, Paul Becher, Ursula Siebert
Summary: The seals and harbour porpoises of the Baltic Sea and North Sea have faced various threats in the past, leading to population fluctuations. Limited information is available on viral pathogens in these marine mammals. A study conducted between 2002-2019 found only a few cases of influenza A virus and phocine distemper virus, suggesting introductions of these pathogens during the sampling period. Standardized and continuous sample collection is recommended for future monitoring efforts.
Article
Engineering, Environmental
Jesper H. Andersen, Zyad Al-Hamdani, Jacob Carstensen, Karen Edelvang, Josefine Egekvist, Berit C. Kaae, Kathrine J. Hammer, Eva Therese Harvey, Jorgen O. Leth, Will Mcclintock, Ciaran Murray, Anton S. Olafsson, Jeppe Olsen, Signe Sveegaard, Jakob Tougaard
Summary: This study reports the potential consequences of implementing the EU Maritime Spatial Planning Directive (MSPD) in Danish waters. A comprehensive framework was used to analyze the effects on ecosystem components, including human stressors and the distribution of various ecosystem entities. The results show that increased human stressors are likely to worsen the environmental and ecological status, conflicting with the objectives of the Marine Strategy Framework Directive (MSFD) and the Water Framework Directive (WFD). The implementation of the MSPD may not promote Blue Growth in Danish marine waters as claimed.
Article
Marine & Freshwater Biology
Signe Hogslund, Henrik Fossing, Jacob Carstensen
Summary: Microphytobenthos (MPB) play a significant role in controlling nutrient fluxes in shallow coastal systems. They can intercept fluxes of ammonium, nitrate, and dissolved silica, both under light and dark conditions. However, phosphate fluxes are only intercepted in light. The impact of MPB on nutrient fluxes varies seasonally, with a larger impact in spring. The relative impact depends on the magnitude of the base fluxes, and it increases with light availability at the seafloor.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Environmental Sciences
Jacob Carstensen, Ciaran Murray, Mats Lindegarth
Summary: Ecosystem responses to human pressures are complex, prompting the development of a method that integrates information from multiple indicators for environmental management. This method utilizes a standardized scale and a hierarchical integration scheme to assess ecological status and identify specific pressures. An online tool has been developed to ensure consistency and transparency in the calculations. The approach is versatile and applicable to different countries and policies that require integrated assessment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Acoustics
Jamie Donald John Macaulay, Laia Rojano-Donate, Michael Ladegaard, Jakob Tougaard, Jonas Teilmann, Tiago A. Marques, Ursula Siebert, Peter Teglberg Madsen
Summary: This study investigates the impact of behavioral changes on the interpretation of acoustic monitoring data. The results show that the behavioral state of harbour porpoises has a significant effect on the probability of detecting clicks, highlighting the importance of considering animal behavior in the analysis of animal abundance.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Siri L. Elmegaard, Jonas Teilmann, Laia Rojano-Donate, Dennis Brennecke, Lonnie Mikkelsen, Jeppe D. Balle, Ulrich Gosewinkel, Line A. Kyhn, Pernille Tonnesen, Magnus Wahlberg, Andreas Ruser, Ursula Siebert, Peter Teglberg Madsen
Summary: This study investigates the physiological and behavioral responses of harbor porpoises to a commercial acoustic harassment device (AHD). The results show that AHD exposure can trigger startled responses, flight responses, and cardiac responses in porpoises, potentially impacting their blood-gas management, breath-hold capability, energy balance, stress levels, and risk of by-catch.
SCIENTIFIC REPORTS
(2023)