Article
Environmental Sciences
David E. Cade, Shirel R. Kahane-Rapport, Ben Wallis, Jeremy A. Goldbogen, Ari S. Friedlaender
Summary: Animals are attracted to resource hotspots, but determining what makes one resource more appealing than another is challenging. A study conducted in Antarctica found that Charlotte Bay had over 5 times more humpback whales than neighboring Wilhelmina Bay, despite the latter being known for large aggregations of whales and Antarctic krill. The study revealed that factors such as patch size and krill length were more likely to predict whale foraging efforts, rather than the overall biomass of prey. Additionally, humpback whales in Charlotte Bay spent a significantly longer time foraging compared to those in Wilhelmina Bay, utilizing both deep dives and surface feeding strategies.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Ross C. Nichols, David E. Cade, Shirel Kahane-Rapport, Jeremy Goldbogen, Alison Stimpert, Douglas Nowacek, Andrew J. Read, David W. Johnston, Ari Friedlaender
Summary: This study used animal movement modelling and biologging tags to investigate the seasonal foraging behavior of Antarctic humpback whales. The results showed that humpback whales have high feeding rates at the beginning of the feeding season, but the feeding rates decrease and foraging primarily occurs at night as the season progresses.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Multidisciplinary Sciences
Ted Cheeseman, Ken Southerland, Jo Marie Acebes, Katherina Audley, Jay Barlow, Lars Bejder, Caitlin Birdsall, Amanda L. Bradford, Josie K. Byington, John Calambokidis, Rachel Cartwright, Jen Cedarleaf, Andrea Jacqueline Garcia Chavez, Jens J. Currie, Joelle De Weerdt, Nicole Doe, Thomas Doniol-Valcroze, Karina Dracott, Olga Filatova, Rachel Finn, Kiirsten Flynn, John K. B. Ford, Astrid Frisch-Jordan, Christine M. Gabriele, Beth Goodwin, Craig Hayslip, Jackie Hildering, Marie C. Hill, Jeff K. Jacobsen, M. Esther Jimenez-Lopez, Meagan Jones, Nozomi Kobayashi, Edward Lyman, Mark Malleson, Evgeny Mamaev, Pamela Martinez Loustalot, Annie Masterman, Craig Matkin, Christie J. McMillan, Jeff E. Moore, John R. Moran, Janet L. Neilson, Hayley Newell, Haruna Okabe, Marilia Olio, Adam A. Pack, Daniel M. Palacios, Heidi C. Pearson, Ester Quintana-Rizzo, Raul Fernando Ramirez Barragan, Nicola Ransome, Hiram Rosales-Nanduca, Fred Sharpe, Tasli Shaw, Stephanie H. Stack, Iain Staniland, Jan Straley, Andrew Szabo, Suzie Teerlink, Olga Titova, Urban R. Jorge, Martin van Aswegen, Marcel Vinicius de Morais, Olga von Ziegesar, Briana Witteveen, Janie Wray, Kymberly M. Yano, Denny Zwiefelhofer, Phil Clapham
Summary: We provide an extensive dataset of humpback whales in the North Pacific Ocean, including photo identification records and encounter data. The dataset was created through collaboration and combines curated photo-ID catalogs with community science data. An image recognition algorithm based on machine learning was used to quickly and accurately match individuals with a 97-99% accuracy rate. Over the study period of 2001-2021, 27,956 unique individuals were documented in 157,350 encounters, with each individual encountered in an average of 5.6 sampling periods.
SCIENTIFIC REPORTS
(2023)
Article
Fisheries
S. McCulloch, J. -O. Meynecke, T. Franklin, W. Franklin, A. L. M. Chauvenet
Summary: This study investigated the behaviors and habitat usage of humpback whales in two aggregation sites on the east coast of Australia, finding Hervey Bay mainly used for surface travel and non-aggressive social behavior, while Gold Coast Bay provided habitat for a wide range of critical humpback whale activities. Both regions are critical habitats for humpback whales during their annual migration, but for different essential activities.
MARINE AND FRESHWATER RESEARCH
(2021)
Article
Marine & Freshwater Biology
Mikala Epp, Michelle E. H. Fournet, Gail K. Davoren
Summary: Humpback whales in coastal Newfoundland have a diverse range of call types, with 13 distinct types identified, some of which are similar to those found in other regions.
MARINE MAMMAL SCIENCE
(2022)
Article
Ecology
Alexandra Mayette, Marianne Marcoux, John Iacozza, Megan Ferguson, Amelia Brower, Lisa Loseto
Summary: Group composition in social animals can influence individuals' responses to habitat trade-offs. This study focuses on the habitat preference of three social group types of Eastern Beaufort Sea beluga whales and identifies water temperature and bathymetric features as key factors influencing their distribution. The research found that the preferences of beluga groups often corresponded to the distributions of their main prey species, suggesting a strong influence of foraging opportunities and energy requirements on habitat use.
Article
Multidisciplinary Sciences
Koki Tsujii, Tomonari Akamatsu, Ryosuke Okamoto, Kyoichi Mori, Yoko Mitani
Summary: Research indicates that humpback whales breed in shallow and warm coastal waters, with males singing complex songs during the breeding season. The singing behavior of humpback whales is influenced by diel and tidal cycles, with singers peaking before sunrise and in the evening.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Ryan R. Reisinger, Ari S. Friedlaender, Alexandre N. Zerbini, Daniel M. Palacios, Virginia Andrews-Goff, Luciano Dalla Rosa, Mike Double, Ken Findlay, Claire Garrigue, Jason How, Curt Jenner, Micheline-Nicole Jenner, Bruce Mate, Howard C. Rosenbaum, S. Mduduzi Seakamela, Rochelle Constantine
Summary: A new method of combining regional models to fit predictive models of animal habitat selection across large ranges was proposed, resulting in higher predictive performance than a circumpolar naive model when tested on satellite telemetry data of humpback whales in the Southern Ocean's five geographic regions.
Article
Engineering, Marine
Lining Zhu, Erhu Hou, Qingwei Zhou, He Wu
Summary: In this study, numerical models are established to investigate the hydrodynamic performance of a self-starting H-Darrius vertical axis tidal turbine array. The study explores the self-starting performance, power coefficients, flow fields, and blade forces of the array, as well as the wake development and feasibility of practical applications. The results show that the power coefficients of the three turbines in the array are improved compared to a stand-alone turbine. The front turbines have a significant impact on energy utilization and turbine vibration. The wake of the rear turbine in the array has a larger influence area, but the velocity deficit recovers quickly.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Menghao Fan, Zhaocheng Sun, Ran Yu, Xiangwei Dong, Zengliang Li, Yiqi Bai
Summary: This paper investigates the effect of leading-edge tubercles on turbine hydrodynamic characteristics and wake development characteristics. Experimental and numerical (LES) methods are used to test the performance and turbulence of a modified turbine called Bio-turbine. The findings show that the leading-edge tubercles have a significant impact on turbine performance and wake instability at different tip speed ratios (TSRs), and highlight the need for greater consideration of turbines with leading-edge tubercles in design.
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Zhaocheng Sun, Long Feng, Yufeng Mao, Dong Li, Yue Zhang, Chengfei Gao, Chao Liu, Menghao Fan
Summary: In this study, the hydrodynamic performance and near wake of tidal current turbines were investigated through numerical simulation and experimental methods. The results showed that the increase of TSR led to a decrease in the pitch of the helix formed by tip vortex and also a decrease in the axial velocity deficit. The experimental results verified the simulation results, but there were quantitative differences.
Article
Engineering, Marine
Yong Ma, Chao Hu, Lei Li
Summary: By simulating the operation of a twin-rotor turbine in a moving state, the study found that the twin-rotor turbine can improve power output efficiency, while surge frequency and surge amplitude have little impact on average power output. The fluctuation amplitudes of thrust and lateral forces of the twin-rotor turbine are larger and increase with surge amplitude and frequency.
Review
Fisheries
K. A. Sorochan, S. Plourde, M. F. Baumgartner, C. L. Johnson
Summary: The study reviews the factors that promote suitable foraging habitat for the North Atlantic right whale, emphasizing the importance of prey depth, supply, and aggregation for facilitating suitable foraging habitat. It also highlights information gaps that hinder rapid and dynamic prediction of suitable foraging habitat.
ICES JOURNAL OF MARINE SCIENCE
(2021)
Article
Engineering, Marine
Ilan Robin, Anne-Claire Bennis, Jean-Claude Dauvin
Summary: This study proposed a numerical approach to assess the impact of biofouling on tidal turbines and found that the pressure coefficient and power coefficient are significantly affected in motionless blade and complete rotor cases, respectively. The study also revealed that biofouling behavior is not accurately represented in motionless blade cases due to the settlement of sessile species in less impactful areas of the chord and the reduction of biofouling impact caused by surrounding turbulence in rotor cases.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Marine
Muyu Zhao, Ying Chen, Jin Jiang
Summary: This study investigates the effect of roll motion on the performance of a floating double-rotor horizontal axis tidal current turbine using Computational Fluid Dynamics (CFD) method. The results show that roll motion leads to a maximum decrease of 30.76% in the average power coefficient and introduces fluctuations in the instantaneous load. Additionally, roll motion significantly accelerates the recovery of wake velocity, with different combinations of roll periods and tip speed ratios resulting in varying degrees of wake velocity recovery.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
