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The loggerhead turtle (Caretta caretta) is a circumglobal species and is listed as vulnerable globally. The North Pacific population nests in Japan and migrates to the Central North Pacific and Pacific coast of North America to feed. In the Mexican Pacific, records of loggerhead presence are largely restricted to the Gulf of Ulloa along the Baja California Peninsula, where very high fisheries by-catch mortality has been reported. Records of loggerhead turtles within the Sea of Cortez also known as the Gulf of California (GC) exist; however, their ecology in this region is poorly understood. We used satellite tracking and an environmental variable analysis (chlorophyll-a (Chl-a) and sea surface temperature (SST)) to determine movements and habitat use of five juvenile loggerhead turtles ranging in straight carapace length from 62.7–68.3 cm (mean: 66.7 ± 2.3 cm). Satellite tracking durations ranged from 73–293 days (mean: 149 ± 62.5 days), transmissions per turtle from 14–1006 (mean: 462 ± 379.5 transmissions) and total travel distance from 1237–5222 km (mean: 3118 ± 1490.7 km). We used travel rate analyses to identify five foraging areas in the GC, which occurred mainly in waters from 10–80 m deep, with mean Chl-a concentrations ranging from 0.28–13.14 mg m−3 and SST ranging from 27.8–34.4°C. This is the first study to describe loggerhead movements in the Gulf of California and our data suggest that loggerhead foraging movements are performed in areas with eutrophic levels of Chl-a.
Professor Jay Spencer Birnbrauer peacefully passed away on November 1, 2017, aged 83, in Perth, Western Australia. Known to his friends and colleagues in Australia as ‘Birny’, he was a pioneer of applied behaviour analysis on both the Australian and world stage. He contributed to the development of behaviour-analytic technology for children with intellectual and developmental disabilities in the 1960s and played a central part in the formation of the Australian Behaviour Modification Association (known today as the Australian Association for Cognitive and Behaviour Therapy) in the 1970s. He was a purist in the field of applied behaviour analysis (ABA) and was relentless in his efforts to see ABA being provided to children with a developmental disability and their families. Birny's influence in Australia, and particularly Western Australia, was mainly imparted through his role with the Master of Applied Psychology program at Murdoch University. His most widely known piece of work, the Murdoch Early Intervention Program, was an early and important replication of Lovaas's evaluation of early intensive behavioural intervention for children with autism. Birny contributed significantly to our field and to many people's lives. He is remembered often and fondly by his many friends and colleagues.
The magnetotelluric method is a technique for imaging the electrical conductivity and structure of the Earth, from the near surface down to the 410 km transition zone and beyond. This book forms the first comprehensive overview of magnetotellurics, from the salient physics and its mathematical representation to practical implementation in the field, data processing, modeling and geological interpretation. Electromagnetic induction in 1-D, 2-D and 3-D media is explored, building from first principles, and with thorough coverage of the practical techniques of time series processing, distortion, numerical modeling and inversion. The fundamental principles are illustrated with a series of case histories describing geological applications. Technical issues, instrumentation and field practices are described for both land and marine surveys. This book provides a rigorous introduction to magnetotellurics for academic researchers and advanced students, and will be of interest to industrial practitioners and geoscientists wanting to incorporate rock conductivity into their interpretations.