Dear colleagues, My co-authors and I are pleased to announce the publication of our article entitled « *Potential signature whistle production by Indo-Pacific humpback dolphins, Sousa chinensis, in the northern South China Sea » *in Animal Behaviour.
Abstract: Dolphin communication involves acoustic signals, including whistles, and the well-studied bottlenose dolphins produce individually distinctive whistles called signature whistles (SWs). The production of a potential SW by an injured Indo-Pacific humpback dolphin has been reported, but no study has attempted to validate this finding in this species. Using data collected during encounters with free-ranging Indo-Pacific humpback dolphins at two locations in the northern South China Sea, we investigated the production of SWs by these dolphins. Of the 3846 analysed whistles, 37% were identified as potential SWs (PSWs) using the SIGnature whistle IDentification method and categorized into 82 PSW types. Overall, PSWs were identified during 54% of encounters. Given the high production rate of stereotyped whistles (62% of all whistles in 90% of encounters) compared with the identified PSWs, we suggest that the SIGnature whistle IDentification method criteria cannot be fully adapted for the detection of SWs in Indo-Pacific humpback dolphins, and more research should be conducted to adapt the criteria to the species. In addition, the characteristics of PSWs differed slightly between locations, potentially because of the geographical separation of populations and habitat differences (e.g. noise levels). The present results confirm the production of stereotyped whistles, including PSWs, by Indo-Pacific humpback dolphins. Further research should be conducted to confirm whether these whistles are similar to bottlenose dolphins’ SWs. The article is freely accessible via this link: https://kwnsfk27.r.eu-west-1.awstrack.me/L0/https:%2F%2Fauthors.elsevier.com%2Fc%2F1k1OOmjM6G3T/1/01020192e955d2b8-b0d365e0-111f-46d9-83d2-f556d4dc4b6c-000000/4fm1TzsWKFnYCZw8fQ6CCRSdNJA=398 For any queries, please feel free to contact me at aga...@idsse.ac.cn or agathe.serre...@gmail.com Best, Agathe On Fri 1 Nov 2024 at 22:30, <marmam-requ...@lists.uvic.ca> wrote: > Send MARMAM mailing list submissions to > marmam@lists.uvic.ca > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.uvic.ca/mailman/listinfo/marmam > or, via email, send a message with subject or body 'help' to > marmam-requ...@lists.uvic.ca > > You can reach the person managing the list at > marmam-ow...@lists.uvic.ca > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of MARMAM digest..." > > > Today's Topics: > > 1. `Xcertainty` R package now available! Incorporating > uncertainty associated with drone-based photogrammetry of marine > mammals (Bierlich, Kevin C) > 2. Job Opening: Wildlife Biologist at Alaska Dept. of Fish and > Game (Pearson, Linnea E (DFG)) > 3. New publication: killer whale predation in the SW Indian > Ocean (Maeva Terrapon) > 4. New publication: Stress and Reproductive Hormones of > Free-Ranging Dolphins Across a Natural Salinity Gradient > (Guinn, Makayla) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 1 Nov 2024 02:41:09 +0000 > From: "Bierlich, Kevin C" <kevin.bierl...@oregonstate.edu> > To: "marmam@lists.uvic.ca" <marmam@lists.uvic.ca> > Subject: [MARMAM] `Xcertainty` R package now available! Incorporating > uncertainty associated with drone-based photogrammetry of marine > mammals > Message-ID: > < > co1p222mb01139f1eef034c16b2a308a78a...@co1p222mb0113.namp222.prod.outlook.com > > > > Content-Type: text/plain; charset="windows-1252" > > Hey MarMam! > > We are excited to announce that the Xcertainty R package is now available > on CRAN! > > Xcertainty is an easy-to-use R package that uses a Bayesian approach for > predicting photogrammetric uncertainty in morphometric measurements of > marine mammals derived from drones. > > The easiest way to install Xcertainty is via CRAN: > > install.packages("Xcertainty") > library(Xcertainty) > > Learn more: > GitHub: https://github.com/MMI-CODEX/Xcertainty > CODEX website: > https://mmi.oregonstate.edu/centers-excellence/codex/software-hardware/xcertainty > CRAN: https://cran.r-project.org/web/packages/Xcertainty/index.html > All morphological measurements derived using drone-based photogrammetry > are susceptible to uncertainty. This uncertainty often varies by the drone > system used. Thus, it is critical to incorporate photogrammetric > uncertainty associated with measurements collected using different drones > so that results are robust and comparable across studies and over long-term > datasets. > The Xcertainty R package makes this simple and easy by producing a > predictive posterior distribution for each measurement. This posterior > distribution can be summarized to describe the measurement (i.e., mean, > median) and its associated uncertainty (i.e., standard deviation, credible > intervals). The posterior distributions are also useful for making > probabilistic statements, such as classifying maturity or diagnosing > pregnancy if a proportion of the posterior distribution for a given > measurement is greater than a specified threshold (e.g., if greater than > 50% of posterior distribution for total body length is > 10 m, the > individual is classified as mature). > Xcertainty is based off of previously published Bayesian statistical > models. In essence, measurements of known-sized objects (?calibration > objects?) collected at various altitudes are used as training data to > predict morphological measurements (e.g., body length) and associated > uncertainty of unknown-sized objects (e.g., whales). > Xcertainty also includes functions that incorporate multiple measurements > (body length and width) to estimate different body condition metrics (i.e., > single widths, surface area, body volume, body area index) with associated > uncertainty, as well as combine body length with age information to > construct growth curves > Cheers, > KC Bierlich & Josh Hewitt > > > KC (Kevin) Bierlich, PhD, MEM > Assistant Professor Senior Research > Center of Drone Excellence (CODEX< > https://mmi.oregonstate.edu/centers-excellence/codex>) > Marine Mammal Institute, > Dept. of Fisheries, Wildlife, & Conservation Sciences, > Oregon State University > Pronouns: he, him, his > kevin.bierl...@oregonstate.edu<mailto:kevin.bierl...@oregonstate.edu> > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.uvic.ca/pipermail/marmam/attachments/20241101/e194c2a0/attachment-0001.html > > > > ------------------------------ > > Message: 2 > Date: Thu, 31 Oct 2024 17:28:15 +0000 > From: "Pearson, Linnea E (DFG)" <linnea.pear...@alaska.gov> > To: "marmam@lists.uvic.ca" <marmam@lists.uvic.ca> > Subject: [MARMAM] Job Opening: Wildlife Biologist at Alaska Dept. of > Fish and Game > Message-ID: > < > by5pr09mb5154f53dd31db1dfaed456dce4...@by5pr09mb5154.namprd09.prod.outlook.com > > > > Content-Type: text/plain; charset="iso-8859-1" > > The Alaska Dept. of Fish and Game is seeking an individual to assist with > monitoring and conservation research of marine mammal species within areas > including Southeast Alaska, Gulf of Alaska, and Bering Sea. We are seeking > someone to work Full Time, Year Round, though the listing description says > Seasonal. The position will design, plan and perform scientific research > for the Alaska Department of Fish and Game Gulf and Bering Marine Mammal > Program. The successful candidate will be an enthusiastic, thoughtful, and > self-motivated biologist able to ask insightful questions, creatively solve > problems, and work independently and as part of a group. The incumbent must > be physically able to work outdoors in harsh weather, have experience > leading field research teams, developing and implementing research > projects, and as a wildlife biologist performing field work studies on > marine mammals. Desired experience in ecology, population monitoring, > and/or cetacean biology. > The position is based in Juneau, AK. The posting is currently open to > Alaska Residents, and closes on Nov 12, 2024. The full posting can be found > here: > > https://www.governmentjobs.com/careers/alaska/jobs/newprint/4707885 > > > Linnea E. Pearson, Ph.D. (she/her) > Wildlife Biologist > Lead, Gulf and Bering Sea Marine Mammal Program > ADF&G- Division of Wildlife Conservation > > linnea.pear...@alaska.gov > Office: 907-465-4313 > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.uvic.ca/pipermail/marmam/attachments/20241031/e9feb410/attachment-0001.html > > > > ------------------------------ > > Message: 3 > Date: Wed, 30 Oct 2024 15:48:52 +0000 > From: Maeva Terrapon <maeva.terra...@gmail.com> > To: marmam@lists.uvic.ca > Subject: [MARMAM] New publication: killer whale predation in the SW > Indian Ocean > Message-ID: > <CA+w4b+6Mi4mKYKzdhOt7ExrCnrTFfnd=+-=YyqMZv= > vfa9z...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Dear colleagues, > > My co-authors and I are pleased to share our new publication, a Short > Communication in the African Journal of Ecology: > > Terrapon, M., Venables, S., Lokker, A., Bertrand, N., Hooker, S. and > Marshall, A. (2024), Killer Whale Predation on a Giant Manta Ray (*Mobula > birostris*), a Sicklefin Devil Ray (*Mobula tarapacana*) and a Tiger > Shark (*Galeocerdo > cuvier*) in the Southwest Indian Ocean. Afr J Ecol, 62: e13342. > https://doi.org/10.1111/aje.13342 > > Abstract: > Knowledge of killer whale (*Orcinus orca*) feeding ecology in tropical > waters is scarce. In the southwest Indian Ocean, opportunistic sightings > provide a valuable source of information to better understand their > behaviour, diet and distribution. Here, we compile existing records of > killer whale predation on elasmobranchs in the southwest Indian Ocean, > including sightings of three undescribed prey species regionally: a giant > manta ray (*Mobula birostris*), a sicklefin devil ray (*Mobula tarapacana*) > and a tiger shark (*Galeocerdo cuvier*). Documenting such observations is > important to increase knowledge on killer whale ecology in the tropics and > the cascading impact they might have on prey populations. > > You can download this Open Access paper here: > https://onlinelibrary.wiley.com/doi/10.1111/aje.13342 > > Do not hesitate to reach out at maeva.terra...@gmail.com if you would like > to discuss this work. > > Many thanks, > > Maeva Terrapon > PhD Candidate > SMRU, University of St Andrews > St Andrews, Fife, KY16 8LB > > Twitter: @MTerrapon > > The University of St Andrews is a charity registered in Scotland: No > SC013532 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.uvic.ca/pipermail/marmam/attachments/20241030/06283e74/attachment-0001.html > > > > ------------------------------ > > Message: 4 > Date: Thu, 31 Oct 2024 14:09:10 +0000 > From: "Guinn, Makayla" <mgui...@islander.tamucc.edu> > To: "marmam@lists.uvic.ca" <marmam@lists.uvic.ca> > Subject: [MARMAM] New publication: Stress and Reproductive Hormones of > Free-Ranging Dolphins Across a Natural Salinity Gradient > Message-ID: > < > sa0pr06mb68767fd6fb1ac18b2112c8d2ae...@sa0pr06mb6876.namprd06.prod.outlook.com > > > > Content-Type: text/plain; charset="gb2312" > > Dear MARMAM community, > > > > On behalf of all authors, we are pleased to announce our recent > publication in ACS Omega: > > > > Guinn, M. A., Elliott, J. Y., Wittmaack, C. S., Sinclair, C., Abdulla, H. > A., & Orbach, D. N. (2024). Stress and Reproductive Hormones of > Free-Ranging Dolphins Across a Natural Salinity Gradient. ACS Omega. > https://doi.org/10.1021/acsomega.4c05466 > > > > ABSTRACT: Bottlenose dolphins (Tursiops truncatus) inhabit environments > with variable natural salinities and experience physiological imbalances > from extreme salinity fluctuations. Low salinity exposure (?10) disrupts > osmoregulation and increases the production of steroid hormones aldosterone > (electrolyte balance) and cortisol (stress response). The effect(s) of high > salinity exposure (>35) on steroid hormone production in bottlenose > dolphins has not previously been assessed. We measured stress hormones > (aldosterone, corticosterone, cortisol, and cortisone) and reproductive > hormones (progesterone and testosterone) in three stocks of free-ranging > bottlenose dolphins inhabiting different natural salinities across the Gulf > of Mexico (0?30, 22?35, 36+). Hormones were extracted from the blubber of > 82 remotely biopsied dolphins and quantified using ultraperformance liquid > chromatography coupled with Orbitrap Fusion mass spectrometry. A positive > correlation was found between cortis! > ol (10.38 ? 0.8 ng/g, n = 13) and salinity (r = 0.62). Aldosterone (58.9 > ? 17.2 ng/g, n = 5) was quantified in dolphin blubber for the first time > and was detected across the salinity gradient but was not significantly > related to salinity levels. Concentrations of testosterone were seasonally > variable. This study enhances our understanding of how climate changes and > extensive anthropogenic stressors challenge homeostasis in a marine > bioindicator species. > > > > Open access to the article is available at: > https://pubs.acs.org/doi/10.1021/acsomega.4c05466 > > > > Do not hesitate to contact me if you have any questions. > > Best, > > Makayla Guinn, M.S. > Ph.D. Student > FABEMM Lab <https://jrich40.wixsite.com/tcbdolphinproject> > NRT STAGES< > https://www.tamucc.edu/science/departments/physical-sciences/coastal-marine/nsf-research-traineeship.php> > Alum > Texas A&M University-Corpus Christi > Tidal Hall 354 > > [cid:156dad38-b3cb-4571-a3c8-57919224541a] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.uvic.ca/pipermail/marmam/attachments/20241031/b6fc633e/attachment.html > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: Outlook-sea2hzbj.png > Type: image/png > Size: 308399 bytes > Desc: Outlook-sea2hzbj.png > URL: < > http://lists.uvic.ca/pipermail/marmam/attachments/20241031/b6fc633e/attachment.png > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > MARMAM mailing list > MARMAM@lists.uvic.ca > https://lists.uvic.ca/mailman/listinfo/marmam > > > ------------------------------ > > End of MARMAM Digest, Vol 232, Issue 2 > ************************************** >
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