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- W2759443316 abstract "Accurate population estimates are important for monitoring the conservation status of species, but nocturnal burrow‐nesting seabirds are notoriously difficult to count. Storm petrel species (Hydrobatidae) are particularly challenging, as burrow entrances are indistinct and response rates to playback low and variable, leading to imprecise population estimates and poor ability to detect trends. Playback is also labour‐intensive, requiring several days of calibration trials to determine site‐ and year‐specific response rates. To test the viability of using infra‐red digital video technology to census storm petrels, we conducted a trial on European Storm Petrels Hydrobates pelagicus at their largest UK colony, Mousa (Shetland). Hourly activity rates recorded from infra‐red filming accurately predicted the number of Apparently Occupied Sites ( AOS ), but this relationship was stronger in natural habitats (boulder‐beach, rocks and scree) than in walls, where between‐night variation was high due to poor and variable image quality, as well as the flight behaviour of Storm Petrels around vertical structures. Few filming attempts failed completely, but image quality was poor on dark nights with rain or fog, and deteriorated during the season as night‐length increased. Playback accurately predicted AOS density in natural habitats, but overestimated total AOS in walls by 38%. Simulations suggest that for the same fieldwork sampling effort, infra‐red filming will generate slightly more precise AOS estimates compared with playback. Better illumination using infra‐red floodlights would increase detection rates on dark nights, probably resulting in greater precision, but the large amount of expensive equipment and reviewing time required currently make infra‐red filming costly and inefficient relative to playback. However, we recommend its use at sites that cannot otherwise be surveyed safely, or where disturbance is a concern." @default.
- W2759443316 created "2017-10-06" @default.
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- W2759443316 date "2017-10-23" @default.
- W2759443316 modified "2023-10-02" @default.
- W2759443316 title "Testing the use of infra-red video cameras to census a nocturnal burrow-nesting seabird, the European Storm Petrel Hydrobates pelagicus" @default.
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- W2759443316 doi "https://doi.org/10.1111/ibi.12539" @default.
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