Dear all, My co-authors and I are pleased to announce the following publication 'Temporally and spatially partitioned behaviours of spinner dolphins:implications for resilience to human disturbance' Julian A. Tyne, David W. Johnston, Fredrik Christiansen and Lars Bejder in the Royal Society Open Science Abstract Selective forces shape the evolution of wildlife behavioural strategies and influence the spatial and temporal partitioning of behavioural activities to maximize individual fitness. Globally, wildlife is increasingly exposed to human activities which may affect their behavioural activities. The ability of wildlife to compensate for the effects of human activities may have implications for their resilience to disturbance. Resilience theory suggests that behavioural systems which are constrained in their repertoires are less resilient to disturbance than flexible systems. Using behavioural time-series data, we show that spinner dolphins (Stenella longirostris) spatially and temporally partition their behavioural activities on a daily basis. Specifically, spinner dolphins were never observed foraging during daytime, where resting was the predominant activity. Travelling and socialising probabilities were higher in early mornings and late afternoons when dolphins were returning from or preparing for nocturnal feeding trips, respectively. The constrained nature of spinner dolphin behaviours suggests they are less resilient to human disturbance than other cetaceans. These dolphins experience the highest exposure rates to human activities ever reported for any cetaceans. Over the last 30 years human activities have increased significantly in the Hawaii, but the spinner dolphins still inhabit these bays. Recent abundance estimates (2011 and 2012), however, are lower than all previous estimates (1979-1981, 1989-1992 and 2003), indicating a possible long-term impact. Quantification of the spatial and temporal partitioning of wildlife behavioural schedules provides critical insight for conservation measures that aim to mitigate the effects of human disturbance. A full copy of the manuscript can be downloaded from http://rsos.royalsocietypublishing.org/lookup/doi/10.1098/rsos.160626 Kind regards, Julian Tyne ______________________________________________________________ Julian Tyne PhD, Murdoch University Cetacean Research Unit (MUCRU) School of Veterinary and Life Sciences Murdoch University South Street Murdoch WA 6150 http://mucru.org/group-members/julian-tyne/ http://scholar.google.com/citations?user=WQoZ0dUAAAAJ https://www.researchgate.net/profile/Julian_Tyne?ev=hdr_xprf http://orcid.org/0000-0002-0676-5659
Dear all, My co-authors and I are pleased to announce the following publication in Marine Mammal Science: Cranial morphology and taxonomic resolution of some dolphin taxa (Delphinidae) in Australian waters, with a focus on the genus Tursiops. Abstract Phylogenetic relationships in the family Delphinidae have been widely debated. We examined 347 skulls of Tursiops, Stenella, Delphinus, Steno, Lagenodelphis, and Sousa in order to resolve the phylogenetic position of Australian species of Tursiops. Five Tursiops type specimens were included. Cranial morphology was described using 2-dimensional (2-D) and 3-dimensional geometric morphometrics (3-GM), counts and categorical data. Analyses showed a clear morphological separation of Tursiops, including type specimens, from other genera. The three Stenella species did not cluster together. Stenella attenuata clustered with Delphinus delphis, and Stenella coeruleoalba with Lagenodelphis hosei. Length and width of the skull and rostrum were important discriminators in both methods. For 3-D data, round vs. angular posterior skull shape distinguished some genera. Taxa that overlapped in the multivariate analyses had different mean tooth counts. Our study challenges genetic studies that identified Tursiops as polyphyletic, with T. aduncus closer to S. attenuata. The full citation is Jedensjö, M., Kemper, C.M. and Krützen, M., 2017. Cranial morphology and taxonomic resolution of some dolphin taxa (Delphinidae) in Australian waters, with a focus on the genus Tursiops. Marine Mammal Science, 33(1), pp.187-205. A full copy of the manuscript can be downloaded from https://www.marinemammalscience.org/journal/, or a pdf can be emailed upon request from Maria (m_jedensjo@hotmail.com). Kind regards, Maria Jedensjö (on behaf of all co-authors) [https://www.marinemammalscience.org/wp-content/uploads/2014/10/journal.jpg]<https://www.marinemammalscience.org/journal/> Journal - Society for Marine Mammalogy<https://www.marinemammalscience.org/journal/> www.marinemammalscience.org Join us Now's the time, become a member today Sign up. As a member, you'll get: Subscription to the Marine Mammal Science journal; Discounted conference rates
participants (2)
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Julian Tyne -
Maria Jedensjö