Browsing by Author "Fischer C"

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    Measuring driving fear: Development and validation of the Instrument for Fear of Driving (IFD)
    (Hogrefe Publishing, 2021-11-24) Fischer C; Schröder A; Taylor JE; Heider J
    Presently, there is no instrument to support the diagnosis of driving fear and its severity. To enable a reliable and valid diagnosis, the 5-item German-language Instrument for Fear of Driving (IFD) was developed. The items, by DSM-5 criteria for a specific phobia, measure the emotional, cognitive, and physiological components of driving fear as well as the degree of avoidance and impairment. The present paper comprises two studies that describe the development of the IFD and its psychometric properties. In Study 1, the IFD was administered to 810 non-clinical participants in an online survey and demonstrated good reliability and construct validity. In Study 2, fifty-four people with a clinical diagnosis, including clinically relevant driving fear, completed the IFD and a clinical interview. The IFD demonstrated good sensitivity and specificity, and a cut-off score resulted in 95% sensitivity and 97% specificity. While the findings are preliminary and further studies with larger samples are needed, the IFD is a promising screening instrument for driving fear and its severity.
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    Residency and movement patterns of an apex predatory shark (Galeocerdo cuvier) at the Galapagos Marine Reserve.
    (2017) Acuña-Marrero D; Smith ANH; Hammerschlag N; Hearn A; Anderson MJ; Calich H; Pawley MDM; Fischer C; Salinas-de-León P
    The potential effectiveness of marine protected areas (MPAs) as a conservation tool for large sharks has been questioned due to the limited spatial extent of most MPAs in contrast to the complex life history and high mobility of many sharks. Here we evaluated the movement dynamics of a highly migratory apex predatory shark (tiger shark Galeocerdo cuvier) at the Galapagos Marine Reserve (GMR). Using data from satellite tracking passive acoustic telemetry, and stereo baited remote underwater video, we estimated residency, activity spaces, site fidelity, distributional abundances and migration patterns from the GMR and in relation to nesting beaches of green sea turtles (Chelonia mydas), a seasonally abundant and predictable prey source for large tiger sharks. Tiger sharks exhibited a high degree of philopatry, with 93% of the total satellite-tracked time across all individuals occurring within the GMR. Large sharks (> 200 cm TL) concentrated their movements in front of the two most important green sea turtle-nesting beaches in the GMR, visiting them on a daily basis during nocturnal hours. In contrast, small sharks (< 200 cm TL) rarely visited turtle-nesting areas and displayed diurnal presence at a third location where only immature sharks were found. Small and some large individuals remained in the three study areas even outside of the turtle-nesting season. Only two sharks were satellite-tracked outside of the GMR, and following long-distance migrations, both individuals returned to turtle-nesting beaches at the subsequent turtle-nesting season. The spatial patterns of residency and site fidelity of tiger sharks suggest that the presence of a predictable source of prey and suitable habitats might reduce the spatial extent of this large shark that is highly migratory in other parts of its range. This highly philopatric behaviour enhances the potential effectiveness of the GMR for their protection.