March 2019 - MARMAM - devlists.uvic.ca

Humpback Whale Tail Identification Internship position Cabo San Lucas, Mexico
by Lisa Hofmann 13 Mar '19

13 Mar '19

Whale Watch Cabo We seek performance-driven, dedicated individuals for long-term internship based in Cabo San Lucas, Mexico. Interns must be available on a full-time basis, including weekends as needed. Program runs from December 2019 until April 2020. Tasks include: - Collecting data of Humpback Whales and other cetaceans on our 2.5 hour whale watching tours - Assisting guides and monitoring passengers - Photo-identification matching of humpback whale flukes and/or dolphin dorsal fins - Data entry and archival tasks - Participation in outreach events and other tasks as needed We are open to welcome interns with their own research proposals as well. POSITION REQUIREMENTS: - Possess a university degree or be advanced undergraduates in biology, zoology, marine biology, ecology, or related field - Available on an unpaid full-time basis for the entire internship period - Available for all field work - Have a mature attitude towards research - Proficient with computers and data entry; specifically using Macintosh - Willing to spend long periods of time in front of a computer doing repetitive tasks - Have a strong work ethic and superior organizational skills - Be independent, adaptable, and a fast-learner - Strong communication skills – comfortable speaking to guests - Able to collect and process data in a detail-oriented manner - Have boating experience - Able to speak, read, write English fluently and able to speak Spanish advanced Are you excited about the internship and you think you fulfill the above requirements... send and email with the following details. Applicants must be authorized to legally remain in Mexico, if they are not Mexican citizens. International applicants will be considered, but it is the responsibility of the applicant to acquire necessary visas and documentation. Interested candidates should submit an application with the following: - Cover letter and Resume/CV with photo, describing training experience and relevant skills - Contact details of 2 references Send the above items in PDF format as email attachments to lisa(a)whalewatchcabo.com with “Internship Application” in subject line. PLEASE NOTE: This is an internship, there is no financial compensation for this position.

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New publication: Depression chains in seafloor likely caused by deep-diving whales
by Helena Herr 13 Mar '19

13 Mar '19

Dear colleagues, on behalf of my co-authors I am pleased to announce the publication of the following paper: Purser A, Herr H, Dreutter S, Dorschel B, Glud RN, Hehemann L, Hoge U, Jamieson AJ, Linley TD, Stewart HA and Wenzhöfer F (2019) Depression chains in seafloor of contrasting morphology, Atacama Trench margin: a comment on Marsh et al. (2018), Royal Society Open Science 6(3):182053. http://dx.doi.org/10.1098/rsos.182053 <http://dx.doi.org/10.1098/rsos.182053> Abstract This comment presents acoustic and visual data showing deep seafloor depression chains similar to those reported in Marsh et al. (R. Soc. open sci. 5: 180286), though from a different deep-sea setting. Marsh et al. present data collected during cruise JC120 from polymetallic nodule rich sites within the Clarion-Clipperton Fracture Zone (CCFZ), at water depths of between 3999 and 4258 m. Within this comment, we present data collected with equivalent acoustic and imaging devices on-board the RV Sonne (SO261—March/April 2018) from the Atacama Trench, approximately 4000 m depth, which shows comparable depression chains in the seafloor. In contrast with the CCFZ observations, our study area was wholly free of polymetallic nodules, an observation therefore weakening the ‘ballast collection’ by deep-sea diving mammals formation hypothesis discussed in their paper. We support their alternate hypothesis that if these features are indeed generated by deep-diving megafauna, then they are more likely the resultant traces of infauna feeding or marks made during opportunistic capture of benthic fish/cephalopods. We observed these potential prey fauna with lander and towed camera systems during the cruise, with example images of these presented here. Both the SO261 and JC120 cruises employed high-resolution sidescan systems at deployment altitudes seldom used routinely until the last few years during scientific deep-sea surveys. Given that both cruises found these depression chains in contrasting physical regions of the East Pacific, they may have a more ubiquitous distribution than at just these sites. Thus, the impacts of cetacean foraging behaviour on deep seafloor communities, and the potential relevance of these prey sources to deep-diving species, should be considered. The open-access paper is available online at: https://royalsocietypublishing.org/doi/10.1098/rsos.182053 <https://royalsocietypublishing.org/doi/10.1098/rsos.182053> Kind regards Helena -- Dr. Helena Herr Centrum für Naturkunde – CeNak – Center of Natural History Martin-Luther-King-Platz 3 / Room 243b 20146 Hamburg - Germany phone +49 (0) 40 42838 1560 email: helena.herr(a)uni-hamburg.de www.cenak.uni-hamburg.de <http://www.cenak.uni-hamburg.de/> Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Section Polar Biological Oceanography AG Ecophysiology of Pelagic Key Species Am Handelshafen 12 / Building E, Room 2390 27570 Bremerhaven - Germany phone: +49 (0) 471 4831 2360 email: helena.herr(a)awi.de

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Marine Mammal Volunteer Position, New Zealand
by Krista Hupman 12 Mar '19

12 Mar '19

Marine Mammal Volunteer Position, New Zealand A volunteer is required to assist with an ongoing study investigating the occurrence, residency and movement of marine mammals (in particular common dolphins and leopard seals) around New Zealand. This work involves desktop research including data entry and photo-identification. This project is part of the ongoing research for the Marine Megafauna Group at the National Institute of Water and Atmospheric Research, Wellington and in collaboration with LeopardSeals.Org. DATES: April – September 2019. A minimum commitment of three months is required and priority will be given to those who can commit for longer periods. LOCATION: Wellington, New Zealand As this is a volunteer position, there is unfortunately no monetary compensation or living provisions. The successful candidate should arrange their own accommodation in Wellington, living expenses, travel costs and visa. QUALIFICATIONS: . The project is well suited to upper level undergrads, recent graduates and graduate students who have some background in biology, marine biology, ecology, zoology or related fields. . Computer proficiency in MS Office (especially Excel) is a requirement. Additionally, proficiency in photo manipulation software (such as photoshop) would be an asset. APPLICATION PROCESS: . Email your CV to krista.hupman(a)niwa.co.nz<mailto:krista.hupman@niwa.co.nz> . Outline why you would like to work on this project, the dates when you are available to assist on the project, your qualifications and relevant experience [cid:image21415e.PNG@ee1489c0.49960515]<http://www.niwa.co.nz> Dr Krista Hupman Cetacean Biologist/Ecologist T +64-4-386-0527 National Institute of Water & Atmospheric Research Ltd (NIWA) 301 Evans Bay Parade, Greta Point, Wellington Connect with NIWA: niwa.co.nz<https://www.niwa.co.nz> Facebook<https://www.facebook.com/nzniwa> Twitter<https://twitter.com/niwa_nz> LinkedIn<https://www.linkedin.com/company/niwa> Instagram<https://www.instagram.com/niwa_science> To ensure compliance with legal requirements and to maintain cyber security standards, NIWA's IT systems are subject to ongoing monitoring, activity logging and auditing. This monitoring and auditing service may be provided by third parties. Such third parties can access information transmitted to, processed by and stored on NIWA's IT systems.

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Mississippi State University, College of Veterinary Medicine - Resident
by Erin Fitzpatrick-Wacker 12 Mar '19

12 Mar '19

Mississippi State University, College of Veterinary Medicine - Resident Apply now<https://secure.dc4.pageuppeople.com/apply/773/gateway/?c=apply&lJobID=49760…> Job no:497607 Position type: Full-time 12-Month Department: 183900 - CVM Pathobiology/Population Med Dep Location:Main Campus - Starkville, MS Categories: Professional Position Open Date:Aug 6 2018 Essential Duties and Responsibilities: This 3 year post-DVM training program will prepare the candidate to successfully complete the certifying examination of the American College of Veterinary Pathologists. The resident will work closely with 4 ACVP board certified pathologists at the CVM and with the marine animal veterinarian at the Institute for Marine Mammal Studies (IMMS) in Gulfport, MS. Training includes participation in necropsy, biopsy, and cytology in cases submitted to the Diagnostic Services Laboratory at the CVM, and participation in rescue, recovery, and necropsy of dolphins and sea turtles in cooperation with IMMS and NOAA facilities in Gulfport and Pascagoula, MS. The caseload is diverse, and diagnostic investigation is strongly supported. The Resident will participate in teaching veterinary students in didactic and clinical settings. Minimum Qualifications: Qualifications include a DVM with excellent spoken and written English. The ability to attain licensure (faculty or traditional licensure) in Mississippi is required. Preferred Qualifications: Preferred experience includes one or more years of clinical veterinary practice, or laboratory experience related to veterinary pathology or animal health Restricted Clause: Position contingent upon funding availability. Instructions for Applying: All applicants must apply online. Review of applications will begin immediately and will continue until the position is filled. The position will be available starting July 1, 2019. Applicants are invited to submit a letter of application describing their interest and professional goals, curriculum vitae, and names, addresses, and telephone numbers for 3 references to Dr. Tim Morgan, morgan(a)cvm.msstate.edu<mailto:morgan@cvm.msstate.edu>, Pathobiology and Population Medicine, PO Box 6100, Mississippi State, MS 39762. Additionally, applicants must provide college transcripts. Any social numbers included on requested transcripts should be redacted prior to submitting online Equal Employment Opportunity Statement: MSU is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, ethnicity, sex (including pregnancy and gender identity), national origin, disability status, age, sexual orientation, genetic information, protected veteran status, or any other characteristic protected by law. We always welcome nominations and applications from women, members of any minority group, and others who share our passion for building a diverse community that reflects the diversity in our student population. Erin Fitzpatrick-Wacker Veterinary Technician Stranding and Rehabilitation Specialist Institute for Marine Mammal Studies Center for Marine Education and Research Ocean Adventures www.IMMS.org<http://www.imms.org/> 10801 Dolphin Lane, Gulfport, MS 39503 (228)896-9182 ext. 1764

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NEW PUBLICATION: fin whale mitogenomics
by andrea cabrera 12 Mar '19

12 Mar '19

Dear Marmam members, My co-authors and I are pleased to share with you our recent publication on fin whale mitogenomics in Molecular Phylogenetics and Evolution. Cabrera, A. A., J. P. A. Hoekendijk, A. Aguilar, S. G. Barco, S. Berrow, D. Bloch, A. Borrell, H. A. Cunha, L. Dalla Rosa, C. P. Dias, P. Gauffier, W. Hao, S. Landry, F. Larsen, V. Martín, S. Mizroch, T. Oosting, N. Øien, C. Pampoulie, S. Panigada, R. Prieto, C. Ramp, V. Rivera-Léon, J. Robbins, C. Ryan, E. Schall, R. Sears, M. A. Silva, J. Urbán, F. W. Wenzel, P. J. Palsbøll and M. Bérubé (2019). "Fin whale (Balaenoptera physalus) mitogenomics: A cautionary tale of defining sub-species from mitochondrial sequence monophyly." Molecular Phylogenetics and Evolution 135: 86-97. ABSTRACT The advent of massive parallel sequencing technologies has resulted in an increase of studies based upon complete mitochondrial genome DNA sequences that revisit the taxonomic status within and among species. Spatially distinct monophyly in such mitogenomic genealogies, i.e., the sharing of a recent common ancestor among con-specific samples collected in the same region has been viewed as evidence for subspecies. Several recent studies in cetaceans have employed this criterion to suggest subsequent intraspecific taxonomic revisions. We reason that employing intra-specific, spatially distinct monophyly at non-recombining, clonally inherited genomes is an unsatisfactory criterion for defining subspecies based upon theoretical (genetic drift) and practical (sampling effort) arguments. This point was illustrated by a re-analysis of a global mitogenomic assessment of fin whales, Balaenoptera physalus spp., published by Archer et al. (2013), which proposed to further subdivide the Northern Hemisphere fin whale subspecies, B. p. physalus. The proposed revision was based upon the detection of spatially distinct monophyly among North Atlantic and North Pacific fin whales in a genealogy based upon complete mitochondrial genome DNA sequences. The extended analysis conducted in this study (1676 mitochondrial control region, 162 complete mitochondrial genome DNA sequences and 20 microsatellite loci genotyped in 380 samples) revealed that the apparent monophyly among North Atlantic fin whales reported by Archer et al. (2013) to be due to low sample sizes. In conclusion, defining sub-species from monophyly (i.e., the absence of para- or polyphyly) can lead to erroneous conclusions due to relatively “trivial” aspects, such as sampling. Basic population genetic processes (i.e., genetic drift and migration) also affect the time to the most recent common ancestor and hence the probability that individuals in a sample are monophyletic. The paper is *Open Access* and *freely available online* from the link below: https://doi.org/10.1016/j.ympev.2019.02.003 If you have any problem with the above link please feel free to contact me directly for a PDF copy. Kind regards,Andrea Cabrera ------------------------------ Andrea Cabrera, PhD Marine Evolution and Conservation (MarECon)Genomics Research in Ecology and Evolution in Nature (GREEN) Groningen Institute for Evolutionary Life Sciences Faculty of Science and Engineering University of GroningenNijenborgh 7 9747 AGGroningen The Netherlands Office phone: +31 50 363 2226 Mail address: PO Box 11103 9700 CC Groningen The Netherlands

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New publication: Minke whale acoustic presence in the eastern North Atlantic
by Denise Risch 11 Mar '19

11 Mar '19

Dear List members, My co-authors and I are happy to share our new manuscript: "Seasonal and diel acoustic presence of North Atlantic minke whales in the North Sea", published in Scientific Reports. Risch, Denise, Samuel C. Wilson, Mathilde Hoogerwerf, Nienke CF van Geel, Ewan WJ Edwards, and Kate L. Brookes. "Seasonal and diel acoustic presence of North Atlantic minke whales in the North Sea." *Scientific Reports* 9, no. 1 (2019): 3571. Abstract: Despite frequent records from other parts of the North Atlantic, minke whales have never been acoustically recorded in the North Sea. This study investigated the detectability of pulse trains previously associated with this species in other regions, in acoustic data from ten sites along the east coast of Scotland. Since preliminary results confirmed pulse train presence, subsequently, an automated detector was applied to these data to record the seasonal and diel presence of minke whale pulse trains. Minke whales were detected from May to November, with most detections occurring in June, July and October. No acoustic detections were made in December, January or in the month of April, whilst no data were available for February and March. This pattern of acoustic presence supports available visual data and suggested an absence of minke whales from the study area during winter. Minke whale acoustic presence showed a statistically significant diel pattern, with a detection peak during night time. This study established the acoustic detectability of minke whales in the North Sea and highlights the potential of using passive acoustic monitoring to study the seasonal presence and spatial distribution of minke whales in the North Sea and wider Northeast Atlantic. I am happy to provide a pdf copy. Cheers, Denise --------------------------------------------------------------------------- Denise Risch Scottish Association for Marine Science (SAMS) Oban, Argyll Scotland, UK, PA37 1QA email: denise.risch(a)sams.ac.uk phone: +44 /(0)1631-559415 twitter: @denrisch http://www.sams.ac.uk/denise-risch

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Florida Tech summer field course (Marine Mammals of the Pacific Northwest)
by Spencer Fire 11 Mar '19

11 Mar '19

Tired of dolphins and manatees? A summer marine mammal field course on the Washington coast might be the solution. This May, Florida Tech will be taking a group of motivated students to Friday Harbor Laboratories in the San Juan Islands to observe and study marine mammals in their natural environment. The course earns you 3 credits that count toward your degree either at the undergraduate or graduate level. Course description: Students will learn the methods, equipment and concepts that many wildlife field biologists use as a daily part of their job, and will participate in an existing research program. Daytime activities will consist primarily of boat-based and land-based surveys of harbor seals, sea lions, killer whales and baleen whales common to the Salish Sea ecosystem. By the end of the course, the students will be trained in digital photography, boat handling, behavioral/spatial data collection, and other practical skills commonly required for a career in wildlife biology. Evening lectures and other activities will provide theoretical knowledge of important aspects of marine mammal behavior, physiology and anatomy, as well as lectures from local experts in the field (plus a demonstration of an animal necropsy!). During the course, students will also develop their own research project and become familiar with how raw data is translated into results that affect marine mammal conservation policy. Course title: Marine Mammal Studies in the Pacific Northwest (MAR3621/MAR5621) Institution: Florida Institute of Technology Instructor: Spencer Fire (sfire(a)fit.edu<mailto:sfire@fit.edu>) Dates: May 6-15, 2019 Location: Friday Harbor, WA and adjacent coastal waters Course cost: Enrolling in the course as a summer student at Florida Tech ($3600; 3 credits of tuition) covers all travel expenses, lodging, meals, field costs, and an occasional cookie. Must have a valid U.S. Passport (students may fly into Victoria, BC) Must be physically fit/able to swim Please contact Dr. Fire directly for more information and to sign up for the course. Check out our Instagram feed<https://www.instagram.com/thefirelab/> (www.instagram.com/thefirelab/) for photos from last year's course!

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VOLUNTEER AND INTERN RECRUITMENT FOR THE MONTENEGRO DOLPHIN RESEARCH (SOUTH ADRIATIC SEA)
by aylin akkaya 11 Mar '19

11 Mar '19

VOLUNTEER AND INTERN RECRUITMENT FOR THE MONTENEGRO DOLPHIN RESEARCH (SOUTH ADRIATIC SEA) OUR PROJECT The Montenegro Dolphin Research is a scientific project run by Marine Mammals Research Association (DMAD). Our study is the first and only long term research study of marine mammals in Montenegrin coastal waters, with recent surveys covering until to the central coastline of Albania. We aim to address questions about marine mammal abundance, distribution and behavior, define critical habitats and investigate the impact of major threats, ranging from tourism to seismic practices. Our wider attention focuses on the promotion and implementation of awareness initiatives targeted at the local community, particularly youth and women. WHO WE ARE LOOKING FOR We offer several volunteering and internship positions: this is a valuable opportunity for graduates, that wish to gain experience in the marine mammal research field, and undergraduates, that would like to obtain internship academic credits. It could be used to develop a scientific project for BSc and MSc thesis. However, we are also open to accept applications from anyone whose love for dolphins is strong and sincere. Opportunities are available starting from May 2019 until September 2019. The minimum duration of the placements is 2 MONTHS, with possible exceptions for skilled candidates. REQUIREMENTS-True interest for marine conservation, self-motivation, maturity and ability to work responsibly;-Ability to cohabit in a dynamic and multicultural environment;-Respect for the organization's rules and willingness to follow standards and procedures;-Proven experience of working effectively as part of a team;-Fluent English (both spoken and written) and good communication skills;-Willingness to learn new software applications.-Background in marine biology and previous fieldwork experience are an advantage. FIELD WORK AND RESPONSIBILITIES-Performing land-based surveys at least three times a week, including sunrise and sunset hours;-Performing boat-based surveys once a week-Collecting dolphins sighting and behavior data, as well as environmental and anthropogenic data;-Operating theodolite and managing its software Pythagoras;-Data entry and analysis;-Cataloging and matching individuals of target species for photo-ID studies via Discovery software;-Raising stakeholder awareness through conservation actions.-Promoting citizen-science activities TRAININGThe Montenegro Dolphin Research team provides lectures and field work training as well as constant mentoring.You will be given the chance to learn the most popular methodologies used in marine mammals research such as:-ArcGIS mapping-Theodolite operation and Pythagoras software;-Photo-identification;-Discovery, Darwin and Logger 2010 software;-Systematic data collection and data analysis;-Visual and acoustic behaviour of marine mammals-Scientific manuscript and technical report writing skills PROJECT PARTICIPATION FEEThe positions require a contribution fee of 700 Euros/ month which fully goes to support the project and the participation fee includes:-Accommodation and expenses-Transportation between the project sites within and between Montenegro and Albania-Training and lectures-Scientific support-Field work-Use of the equipmentApplicants are responsible for their transportation to/from Montenegro, meals, insurance (all participants should have health and/or travel insurance) and personal expenses. HOW TO APPLYEmail your CV and cover letter to akkayaaylinn(a)gmail.com (Aylin Akkaya Bas) and info(a)dmad.org.tr, explaining why you are the perfect asset for our team and which goals you hope to achieve with us! Please mention the PERIOD OF INTEREST AND DURATION OF AVAILABILITY!If you wish to have more info about our work and get to know us better follow our websites:https://www.dmad.org.tr/volunteeringwww.cetazoom.orghttps://sancet… All the best,Dr. Aylin Akkaya BasScientific Director of Marine Mammals Research AssociationHead Project Coordinator of Montenegro Dolphin ResearchDeniz Memelileri Araştırma Derneği (DMAD)+38260024363skype: aylin.akkaya3

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New paper on foraging behaviour of Weddell seals in the southern Weddell Sea
by Dominik Nachtsheim 10 Mar '19

10 Mar '19

Dear MARMAM readers, we are pleased to announce the publication of the following article in Progress in Oceanography: Nachtsheim, D.A., Ryan, S., Schröder, M., Jensen, L., Oosthuizen, W.C., Bester, M.N., Hagen, W. and Bornemann, H., 2019. Foraging behaviour of Weddell seals (Leptonychotes weddellii) in connection to oceanographic conditions in the southern Weddell Sea. Progress in Oceanography 173, 165-179. doi:10.1016/j.pocean.2019.02.013 Abstract The region of the Filchner Outflow System (FOS) in the southeastern Weddell Sea is characterized by intensive and complex interactions of different water masses. Dense Ice Shelf Water (ISW) emerging from beneath the ice shelf cavities on the continental shelf, meets Modified Warm Deep Water (MWDW) originating from the Antarctic Circumpolar Current at the sill of the Filchner Trough. These hydrographic features convert the FOS into an oceanographic key region, which may also show enhanced biological productivity and corresponding aggregations of marine top predators. In this context, six adult Weddell seals (Leptonychotes weddellii) were instrumented with CTD-combined satellite relay data loggers in austral summer 2014. By means of these long-term data loggers we aimed at investigating the influence of environmental conditions on the seals’ foraging behaviour throughout seasons, focussing on the local oceanographic features. Weddell seals performed pelagic and demersal dives, mainly on the continental shelf, where they presumably exploited the abundant bentho-pelagic fish fauna. Diurnal and seasonal variations in light availability affected foraging activities. MWDW was associated with increased foraging effort. However, we observed differences in movements and habitat use between two different groups of Weddell seals. Seals tagged in the pack ice of the FOS focussed their foraging activities to the western and, partly, eastern flank of the Filchner Trough, which coincides with inflow pathways of MWDW. In contrast, Weddell seals tagged on the coastal fast ice exhibited typical central-place foraging and utilized resources close to their colony. High foraging effort in MWDW and high utilization of areas associated with an inflow of MWDW raise questions on the underlying biological features. This emphasizes the importance of further interdisciplinary ecological investigations in the near future, as the FOS may soon be impacted by predicted climatic changes. The paper can be accessed and downloaded freely under the following link: https://www.sciencedirect.com/science/article/pii/S0079661118301216 If you have any questions or inquiries, do not hesitate to contact me directly! All the best on behalf of all authors, Dominik Nachtsheim --- Dominik A. Nachtsheim, M.Sc. University of Veterinary Medicine Hannover, Foundation Institute for Terrestrial and Aquatic Wildlife Research (ITAW) Werftstr. 6 25761 Büsum Germany Dominik.Nachtsheim(a)tiho-hannover.de Tel: +49 511 856-8159 Fax: +49 511 856-8181 ResearchGate: https://www.researchgate.net/profile/Dominik_Nachtsheim

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New publication: The functional role of Heaviside's dolphin (Cephalorhynchus heavisidii) rapidly pulsed signals
by Morgan J. Martin 10 Mar '19

10 Mar '19

Dear MARMAM Members, My co-authors and I are very pleased to announce the publication of our new manuscript "To buzz or burst-pulse? The functional role of Heaviside's dolphin, *Cephalorhynchus heavisidii,* rapidly pulsed signals" published in the Journal of Animal Behaviour. This study is the first to examine relationships between the surface and acoustic behaviours of Heaviside's dolphins. The reference and abstract are provided below. The article is available online now and will appear in the April issue of Animal Behaviour. Martin, M.J., Elwen, S.H., Kassanjee, R., Gridley, T. (2019). To buzz or burst-pulse? The functional role of Heaviside's dolphin, *Cephalorhynchus heavisidii,* rapidly pulsed signals. *Animal Behaviour*. DOI: 10.1016/j.anbehav.2019.01.007 Abstract: Four groups of toothed whales have independently evolved to produce narrowband high-frequency (NBHF) echolocation signals (i.e. clicks) with a strikingly similar waveform and centroid frequency around 125 kHz. These signals are thought to help NBHF species avoid predation by echolocating and communicating at frequencies inaudible to predators, a form of acoustic crypsis. Heaviside's dolphins produce NBHF echolocation clicks in trains and often in rapid succession in the form of buzzes. In addition, a second click type with a lower frequency and broader bandwidth was recently described, typically emitted in rapid succession in the form of burst-pulses. We investigated the relationship between buzz and burst-pulse signals and both surface behaviour (foraging, ‘interacting with the kayak’ and socializing) and group size, using a multivariable regression on the signal occurrence and signal count data. Signal occurrence and counts were not related to group size in the regression analysis. Burst-pulses were strongly linked to socializing behaviour, occurring more often and more frequently during socializing and much less during foraging. Buzz vocalizations were not strongly linked to a specific behaviour although there was some evidence of an increase in production during foraging and socializing. In addition, individual level production rates of buzzes during foraging and socializing, and burst-pulses during socializing decreased with increasing group size. Temporally patterned burst-pulse signals were also identified, often occurring within a series of burst-pulses and were directly linked to specific events such as aerial leaping, backflipping, tail slapping and potential mating. Our findings suggest Heaviside's dolphins have a more complex communication system based on pulsed vocalizations than previously understood, perhaps driven by the need to facilitate the social interactions of this species. The paper is available online at: https://doi.org/10.1016/j.anbehav.2019.01.007 A PDF is also available upon email request to: mjmartin(a)sandiego.edu Many thanks, Morgan Martin on behalf of my co-authors

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