Navigating uncertain waters: a critical review of inferring foraging behaviour from location and dive data in pinnipeds

In the last thirty years, the emergence and progression of biologging technology has led to great advances in marine predator ecology. Large databases of location and dive observations from biologging devices have been compiled for an increasing number of diving predator species (such as pinnipeds, sea turtles, seabirds and cetaceans), enabling complex questions about animal activity budgets and habitat use to be addressed. Central to answering these questions is our ability to correctly identify and quantify the frequency of essential behaviours, such as foraging. Despite technological advances that have increased the quality and resolution of location and dive data, accurately interpreting behaviour from such data remains a challenge, and analytical methods are only beginning to unlock the full potential of existing datasets. This review evaluates both traditional and emerging methods and presents a starting platform of options for future studies of marine predator foraging ecology, particularly from location and two-dimensional (time-depth) dive data. We outline the different devices and data types available, discuss the limitations and advantages of commonly-used analytical techniques, and highlight key areas for future research. We focus our review on pinnipeds - one of the most studied taxa of marine predators - but offer insights that will be applicable to other air-breathing marine predator tracking studies. We highlight that traditionally-used methods for inferring foraging from location and dive data, such as first-passage time and dive shape analysis, have important caveats and limitations depending on the nature of the data and the research question. We suggest that more holistic statistical techniques, such as state-space models, which can synthesise multiple track, dive and environmental metrics whilst simultaneously accounting for measurement error, offer more robust alternatives. Finally, we identify a need for more research to elucidate the role of physical oceanography, device effects, study animal selection, and developmental stages in predator behaviour and data interpretation.

Homesick for the unheimlich: back to the uncanny future in Alien: Isolation

In 2014 Sega released Creative Assembly’s Alien: Isolation, a video game sequel to the 1979 film Alien. As an attempt to create both an authentic homage to the Alien franchise and a credible successor to Ridley Scott’s original film, Alien: Isolation was received as both a work of remediated nostalgia and as a deeply uncanny survival horror. This article discusses Alien: Isolation framed by theories of the uncanny (the unhomely) and of nostalgia (the homely), with the aim of revealing how the production design of the game reconciled these seemingly contradictory but nonetheless overlapping aesthetic qualities. By drawing on examples from Alien: Isolation’s visual and level design, this article discusses how the integration of nostalgic and uncanny qualities could be of value to horror and sci-fi game design, in particular to the development of sequels within existing franchises, and to remediations, remakes and reboots.