Using Aerial Photogrammetry to Assess Stock-Wide Marine Turtle Nesting Distribution, Abundance and Cumulative Exposure to Industrial Activity
نویسندگان
چکیده
The lack of accurate distribution maps and reliable abundance estimates for marine species can limit the ability managers to design scale-appropriate management measures a stock or population. Here, we tested utility aerial photogrammetry conducting large-scale surveys nesting turtles at remote locations, with focus on flatback turtle (Natator depressus) in Pilbara region Western Australia. Aerial were conducted between 29 November 6 December 2016 overlap peak season collected imagery was used examine distribution, abundance, cumulative exposure industrial activity relative protected areas. Two observers independently reviewed georeferenced photographs 644 beaches recorded tracks other evidence activity. A total 375 showed signs by either flatback, green (Chelonia mydas) hawksbill (Eretmochelys imbricata) turtles. Most these (85.3%) located islands, rest (14.7%) mainland. Half (n = 174) active fresh (0–36 h. old) activity, track varying from 1.0 222.0 tracks·night−1. Six rookeries accounted 62% stock. Remarkably, 77% identified occurred within However, one-third (34%) those also 5 km major site, including eight highest (50–250 tracks·night−1). Several key as being relatively unexposed industry-related pressures but currently unprotected, highlighting need impact assessment be completed this Finally, our tallies multiple ground-survey highly correlated together low intra- inter-observer errors suggested that data via Such digitized therefore assess pressures, reveal new conservation opportunities.
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ژورنال
عنوان ژورنال: Remote Sensing
سال: 2021
ISSN: ['2315-4632', '2315-4675']
DOI: https://doi.org/10.3390/rs13061116