Article
Acoustics
Jason Mulsow, Carolyn E. Schlundt, Madelyn G. Strahan, James. J. Finneran
Summary: Studies on marine mammal temporary threshold shift (TTS) from impulsive sources have shown small TTS magnitudes, mainly because much of the energy in tested sources lies below the subjects' range of best hearing. In this study of dolphin TTS, 10-ms impulses centered at 8 kHz were used to induce larger TTS magnitudes and assess the time course of hearing recovery.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Environmental Sciences
Betzi Perez-Ortega, Rebecca Daw, Brennan Paradee, Emma Gimbrere, Laura J. May-Collado
Summary: Bottlenose dolphins' whistles play a key role in social communication and can indicate emotional states such as danger, alertness, and stress. This study found significant differences in whistle modulation between sites with different levels of boat traffic, with dolphins showing more intense modulation in the presence of tour boats. Implementing measures to reduce disruption from boat traffic and enforcing operator guidelines could help protect the dolphins' communication and emotional states.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Agriculture, Dairy & Animal Science
Tim Huettner, Sandra Dollhaeupl, Ralph Simon, Katrin Baumgartner, Lorenzo von Fersen
Summary: The study showed that the activity budgets of dolphins are significantly affected by individual and external factors, and construction noise can alter dolphin behavior. Behavioral observations are crucial welfare indicators, especially when used in conjunction with other measures, providing important information about the welfare status of animals.
Article
Multidisciplinary Sciences
Gabriella La Manna, Nikolina Rako-Gospic, Daniela Silvia Pace, Silvia Bonizzoni, Lucia Di Iorio, Lauren Polimeno, Francesco Perretti, Fabio Ronchetti, Giancarlo Giacomini, Gianni Pavan, Giulia Pedrazzi, Helena Labach, Giulia Ceccherelli
Summary: The study examines the signature whistles of common bottlenose dolphins in the Mediterranean Sea, finding that genetic structure has minimal influence on whistle acoustic structure and geographic isolation only partially affects whistle variability. Environmental conditions and population characteristics have a significant impact on signature whistles.
SCIENTIFIC REPORTS
(2022)
Article
Acoustics
Brian K. Branstetter, Rachel Brietenstein, Gavin Goya, Megan Tormey, Teri Wu, James J. Finneran
Summary: The horizontal angular resolution of two bottlenose dolphins was measured using a target discrimination paradigm. The results suggest that horizontal auditory spatial acuity may be a common feature of the mammalian auditory system.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Multidisciplinary Sciences
A. R. Luis, L. J. May-Collado, N. Rako-Gospic, T. Gridley, E. Papale, A. Azevedo, M. A. Silva, G. Buscaino, D. Herzing, M. E. dos Santos
Summary: Acoustical geographic variation is common in widely distributed species, with intraspecific variation in cetaceans linked to ecological factors, geographic barriers, and social processes. The study on bottlenose dolphins found a rich acoustic repertoire with low divergence values, suggesting the importance of cultural transmission in geographic variation. Further research is needed to clarify boundaries between populations and understand vocal learning and cultural transmission in bottlenose dolphin societies.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Lisa K. Lauderdale, K. Alex Shorter, Ding Zhang, Joaquin Gabaldon, Jill D. Mellen, Michael T. Walsh, Douglas A. Granger, Lance J. Miller
Summary: High-resolution non-invasive cetacean tagging systems were used to investigate the influence of habitat characteristics and management factors on behavior by quantifying activity levels and distance traveled by bottlenose dolphins in accredited zoos and aquariums. The study found that enrichment programs and scheduling training times were positively associated with dolphin activity levels and energy expenditure, while habitat characteristics had a weaker relationship.
Article
Multidisciplinary Sciences
Lisa K. Lauderdale, K. Alex Shorter, Ding Zhang, Joaquin Gabaldon, Jill D. Mellen, Michael T. Walsh, Douglas A. Granger, Lance J. Miller
Summary: High-resolution non-invasive cetacean tagging systems were used to investigate the impact of habitat characteristics and management factors on the behavior of bottlenose dolphins in accredited zoos and aquariums. The study found that enrichment programs and predictable training session times were strongly associated with dolphins' energy expenditure and activity levels, while habitat characteristics had a weaker association. Management practices were shown to have a stronger influence on activity levels than habitat characteristics.
Article
Environmental Sciences
Elizabeth J. Berens McCabe, Randall S. Wells, Christina N. Toms, Aaron A. Barleycorn, Krystan A. Wilkinson, Valeriy Palubok
Summary: Red tide blooms caused by Karenia brevis have significant ecological effects on the prey fish assemblage of common bottlenose dolphins in Sarasota Bay, Florida. The impacts vary based on bloom intensity, season, and frequency, with distinct short-term shifts in prey structure during blooms. High K. brevis density is associated with changes in prey abundance and diversity, with recovery to pre-bloom levels typically occurring within one year.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Acoustics
Jason Mulsow, James J. Finneran, Dorian S. Houser, Robert F. Burkard, Madelyn G. Strahan, Ryan Jones
Summary: Studies on dolphin auditory brainstem response (ABR) have shown that the response to sound offset includes contributions from at least two distinct responses, with one possibly arising from activation of neural units shifted basally relative to stimulus frequency, and the other representing a true offset response from afferent centers further up the auditory pathway.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Biodiversity Conservation
Diana Rocha, Sarah A. Marley, Benjamin Drakeford, Jonathan Potts, Angie Gullan
Summary: Swim-with-dolphin (SWD) activities can negatively impact dolphin behavior and activity budget, despite current management measures. This study aimed to determine the effects of SWD tourism on the behavior of resident Indo-Pacific bottlenose dolphins in Mozambique. Results showed significant short-term changes in dolphin behavior, with dolphins being more likely to travel and less likely to socialize, rest, or forage after tourist swims.
BIOLOGICAL CONSERVATION
(2023)
Article
Engineering, Marine
Marie-Noel R. Matthews, Darren S. Ireland, David G. Zeddies, Robert H. Brune, Cynthia D. Pyc
Summary: Concerns about environmental impacts of air gun surveys drive research on marine vibroseis systems which produce lower acoustic pressure but longer duration signals compared to air guns. Studies show more behavioral disturbance for marine mammals with MV arrays than air gun arrays.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Physiology
Jennifer M. Meegan, Amanda J. Ardente, John R. Poindexter, Mark Baird, Brittany Novick, Celeste Parry, Eric D. Jensen, Stephanie Venn-Watson, Khashayar Sakhaee, Cynthia R. Smith
Summary: This study investigated the impact of diet on urinary physicochemical risk factors in bottlenose dolphins and found that increasing the proportion of free-ranging diet fish species and optimizing the DCAD could positively influence the risk factors associated with NH4U kidney stone development in dolphins under professional care.
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
(2021)
Article
Behavioral Sciences
Chisato Yamamoto, Toshiaki Ishibashi
Summary: The exchange of prosocial behaviors like flipper rubbing in dolphins is influenced by social structure and relationships. Dolphins maintain reciprocity in flipper rubbing over the long term by preferentially choosing partners who reciprocate, suggesting an emotional bookkeeping system.
JOURNAL OF ETHOLOGY
(2022)
Article
Ecology
Kasha Strickland, Janet Mann, Vivienne Foroughirad, Alexis L. Levengood, Celine H. Frere
Summary: This study investigated the drivers and maintenance of individual variation in the niche of bottlenose dolphins. It found that individual differences in habitat use were driven by a strong maternal effect. Furthermore, there was no relationship between habitat use and calving success, suggesting that individual variation in habitat use does not affect reproductive fitness.
JOURNAL OF ANIMAL ECOLOGY
(2021)
Article
Marine & Freshwater Biology
Ally Rice, Amanda J. Debich, Ana Sirovic, Erin M. Oleson, Jennifer S. Trickey, Leah M. Varga, Sean M. Wiggins, John A. Hildebrand, Simone Baumann-Pickering
Summary: This study investigated the spatial and temporal distributions of ten cetacean species in the waters offshore of Washington State using passive acoustic monitoring. The results show clear differences in acoustic presence of different species in different seasons and locations. Additionally, there were interannual variations in detections for most mysticete species, which may be linked to oceanographic conditions.
Article
Environmental Sciences
Edward D. Weber, Toby D. Auth, Simone Baumann-Pickering, Timothy R. Baumgartner, Eric P. Bjorkstedt, Steven J. Bograd, Brian J. Burke, Jose L. Cadena-Ramirez, Elizabeth A. Daly, Martin de la Cruz, Heidi Dewar, John C. Field, Jennifer L. Fisher, Ashlyn Giddings, Ralf Goericke, Eliana Gomez-Ocampo, Jose Gomez-Valdes, Elliot L. Hazen, John Hildebrand, Cheryl A. Horton, Kym C. Jacobson, Michael G. Jacox, Jaime Jahncke, Mati Kahru, Raphe M. Kudela, Bertha E. Lavaniegos, Andrew Leising, Sharon R. Melin, Luis Erasmo Miranda-Bojorquez, Cheryl A. Morgan, Catherine F. Nickels, Rachael A. Orben, Jessica M. Porquez, Elan J. Portner, Roxanne R. Robertson, Daniel L. Rudnick, Keith M. Sakuma, Jarrod A. Santora, Isaac D. Schroeder, Owyn E. Snodgrass, William J. Sydeman, Andrew R. Thompson, Sarah Ann Thompson, Jennifer S. Trickey, Josue Villegas-Mendoza, Pete Warzybok, William Watson, Samantha M. Zeman
Summary: The California Current System has experienced significant fluctuations in environmental conditions in recent years, impacting the biological community. The formation of a marine heatwave in 2019 and strong coastal upwelling in early 2020 created relatively productive conditions in the northern CCS, while ocean temperatures remained above average in the southern CCS. The community dynamics at different trophic levels were controlled by coastal upwelling in the north and a long-term warming trend in the south, rather than the marine heatwave itself.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Studies
Sarah G. Weiss, Danielle Cholewiak, Kaitlin E. Frasier, Jennifer S. Trickey, Simone Baumann-Pickering, John A. Hildebrand, Sofie M. Van Parijs
Summary: This study assesses the co-occurrence of cetaceans and anthropogenic activities, finding that both sources are significant contributors at the three study sites. Different cetacean species/groups were present varying proportions of days at different sites, with delphinids, sperm whales, and fin whales detected most consistently.
Article
Oceanography
Jay Barlow, Ted Cheeseman, Jennifer S. Trickey
Summary: This study utilized an autonomous towed hydrophone system to identify several cetacean species in the Southern Atlantic region, including previously undescribed echolocation pulse types, demonstrating the importance of this method in studying cetacean distribution in rough seas.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Karlina Merkens, Simone Baumann-Pickering, Morgan A. Ziegenhorn, Jennifer S. Trickey, Ann N. Allen, Erin M. Oleson
Summary: The study found that the nearshore deep-water acoustic environment off the coast of Kona, Hawai'i is heavily influenced by signals generated by humans and odontocete cetaceans, with a diel cycle of alternating sound sources of vessels and echosounders during daylight hours and odontocetes clicks dominating the soundscape at night. In addition, the presence of winter-resident humpback whales producing calls in lower frequencies was observed. Overall, seasonal variability was relatively subtle, indicative of the tropical latitude and deep-water environment. The analysis highlighted the first long-term examination of a marine soundscape in the North Pacific, emphasizing the intense presence of manmade noise in this area.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Acoustics
James J. Finneran, Jason Mulsow, Madelyn G. Strahan, Dorian S. Houser, Robert F. Burkard
Summary: Cochlear dispersion causes delays in neural responses between high and low-frequency regions, affecting farfield neural response measurements. Stack ABRs are larger than unmasked broadband ABRs, but the enhancement is smaller compared to humans. Compensation for cochlear dispersion is more beneficial for ABR measurements in species with better low-frequency hearing.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Acoustics
Alyssa W. Accomando, Jason Mulsow, Dorian S. Houser, James J. Finneran
Summary: This study found that dolphins' perception of echoes depends on the critical interval of their auditory temporal window, and there are differences in the perception of microspectra and macrospectra.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Zoology
Mario A. Onofre-Diaz, Christian D. Ortega-Ortiz, Gustavo Cardenas-Hinojosa, Rodrigo Huerta-Patino, Erin Falcone, Jennifer S. Trickey, Koen Van Waerebeek, Marie-Francoise Van Bressem
Summary: Knowledge of health threats to beaked whales in the Eastern Pacific Ocean is limited. This study examined the skin conditions and injuries of Ziphius cavirostris and Mesoplodon peruvianus in the region. The results showed various traumatic and non-traumatic skin conditions, including traumatic lesions, diatom films, cookie-cutter shark bite scars, etc. The study also documented scars possibly related to fisheries interaction and partial fin amputation in some individuals. Circular, perforating lesions of dorsal fins of unknown etiology were observed as well. These findings provide valuable insights into the health and welfare of beaked whales in the Northeast Pacific.
Article
Environmental Sciences
Andrew R. Thompson, Eric P. Bjorkstedt, Steven J. Bograd, Jennifer L. Fisher, Elliott L. Hazen, Andrew Leising, Jarrod A. Santora, Erin V. Satterthwaite, William J. Sydeman, Michaela Alksne, Toby D. Auth, Simone Baumann-Pickering, Noelle M. Bowlin, Brian J. Burke, Elizabeth A. Daly, Heidi Dewar, John C. Field, Newell T. Garfield, Ashlyn Giddings, Ralf Goericke, John Hildebrand, Cheryl A. Horton, Kym C. Jacobson, Michael G. Jacox, Jaime Jahncke, Michael Johns, Joshua Jones, Raphe M. Kudela, Sharon R. Melin, Cheryl A. Morgan, Catherine F. Nickels, Rachael A. Orben, Jessica M. Porquez, Elan J. Portner, Antonella Preti, Roxanne R. Robertson, Daniel L. Rudnick, Keith M. Sakuma, Isaac D. Schroeder, Owyn E. Snodgrass, Sarah Ann Thompson, Jennifer S. Trickey, Pete Warzybok, William Watson, Edward D. Weber
Summary: A La Nina occurred in the California Current Ecosystem in 2021, with many indicators resembling past La Ninas, but with some differences as well. Further study is needed to understand the effects of La Nina on this ecosystem.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biology
Jennifer S. Trickey, Gustavo Cardenas-Hinojosa, Lorenzo Rojas-Bracho, Gregory S. Schorr, Brenda K. Rone, Eva Hidalgo-Pla, Ally Rice, Simone Baumann-Pickering
Summary: Concerns are raised about the effects of unregulated acoustic technologies on acoustically sensitive marine fauna worldwide. This study shows that ultrasonic antifouling devices can be an acoustic disturbance to marine wildlife, resulting in reduced presence of Cuvier's beaked whales. These findings highlight the importance of identifying key noise sources and assessing their impacts to effectively manage oceanic ecosystems.
COMMUNICATIONS BIOLOGY
(2022)
Article
Biodiversity Conservation
Simone Baumann-Pickering, Jennifer S. Trickey, Alba Solsona-Berga, Ally Rice, Erin M. Oleson, John A. Hildebrand, Kaitlin E. Frasier
Summary: Understanding the distribution and population structure of cetacean species is crucial for conservation and management. In this study, acoustic recordings were used to investigate whether differences in echolocation click peak frequency could indicate population structure in Blainville's beaked whale. The results suggest a possible acoustic delineation of populations, with a correlation between signal peak frequency and latitude.
DIVERSITY AND DISTRIBUTIONS
(2023)
Article
Acoustics
James J. Finneran, Katelin Lally, Madelyn G. Strahan, Kyle Donohoe, Jason Mulsow, Dorian S. Houser
Summary: The study aimed to determine if dolphins would reduce their hearing sensitivity in response to an intense tone presented at a fixed rate but increasing level, without an otherwise explicit warning. Results showed that dolphins can learn the timing of repetitive noise and may reduce their hearing sensitivity if the sound pressure level is high enough, presumably to self-mitigate the noise effects.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
James J. Finneran, Madelyn G. Strahan, Jason Mulsow, Dorian S. Houser
Summary: The study investigated the ability of bottlenose dolphins to detect changes in echo phase using a jittered-echo paradigm. The dolphins were able to discriminate between different echo fine structures, showing sensitivity to changes in phase and delay. The results suggest that the auditory system of dolphins is sensitive to echo fine structure, similar to a coherent receiver.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
James J. Finneran, Carolyn E. Schlundt, Victoria Bowman, Keith Jenkins
Summary: The study aimed to investigate whether observed head movements of dolphins during impulse noise exposures were correlated with changes in auditory system sensitivity. The results showed that the dolphins exhibited a decline in auditory steady-state response (ASSR) amplitude between air gun impulses, followed by an elevation in ASSR amplitude after each impulse. This pattern was not observed during control trials. The findings suggest that the dolphins learned the timing of the noise sequences and adjusted their hearing sensitivity to mitigate the auditory effects of the noise. The specific mechanisms behind these effects remain unknown.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Jason Mulsow, James J. Finneran, Madelyn G. Strahan, Dorian S. Houser, Robert F. Burkard
Summary: The effect of broadband chirp sweep rate and level on auditory brainstem response (ABR) amplitude in bottlenose dolphins and California sea lions was examined. It was found that the optimal chirps, designed based on cochlear traveling wave speeds, increased ABR peak amplitudes by compensating for cochlear dispersion.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
