Springer eBooks, Journal Year: 2023, Volume and Issue: unknown, P. 127 - 157
Published: Jan. 1, 2023
Language: Английский
Biodiversity and Conservation, Journal Year: 2022, Volume and Issue: 31(13-14), P. 3179 - 3195
Published: Oct. 22, 2022
Abstract The payload size and commercial availability of thermal infrared cameras mounted on drones has initiated a new wave in the potential for conservationists researchers to survey, count detect wildlife, even most complex habitats such as forest canopies. However, several fundamental design methodological questions remain be tested before standardized monitoring approaches can broadly adopted. We test impact both speed drone flights diel flight period tropical rainforest canopy wildlife detections. Detection identification rates differ between speeds time. Overall ~ 36% more detections were made during slower speeds, along with greater ability categorize taxonomic groups. Flights conducted at 3am resulted 67% compared 7am (the lowest detection rate). 112% could identified group – due types being assistance RGB camera. Although, this technology holds great promise carrying out surveys structurally poorly known ecosystems like canopies, there is do further testing, building automated post-processing systems. Our results suggest that studies same habitat types, animal densities, off by multiples if flown different times and/or speeds. difference an alarming 5-6x variation or depending changes these two factors alone.
Language: Английский
Citations
13
Primates, Journal Year: 2023, Volume and Issue: 64(4), P. 407 - 413
Published: May 4, 2023
Language: Английский
Citations
8
Drones, Journal Year: 2023, Volume and Issue: 7(8), P. 497 - 497
Published: July 28, 2023
Remotely piloted aircraft systems (RPAS, or ‘drones’ hereafter) have potential for surveying waterbird species and habitats, but there is a risk that the disturbance from drones could compromise count accuracy bird welfare. We examined response of 16 to repeated up-and-back overhead drone flights (n = 50 flights) at multiple flight heights (80, 60, 40 20 m) using three common platforms (DJI Matrice 300, DJI Mavic 2 Enterprise Advanced Phantom 4). A ground observer scored species’ responses flights, which ranged no (no change initial behavior), vigilance (head turning tracking), movement within site (swimming, diving, into on water) substantial resulting in departure pond (fleeing). total 280 encounters with were observed. The most across all was (70.7%), followed by (27.5%), whereas more intense comparatively rare (1.8%). higher intensity during earlier before moderating substantially later flights. Thus, our case study provides first unambiguous evidence attenuation drones.
Language: Английский
Citations
6
Sensors, Journal Year: 2024, Volume and Issue: 24(17), P. 5659 - 5659
Published: Aug. 30, 2024
Geoffroy's spider monkeys, an endangered, fast-moving arboreal primate species with a large home range and high degree of fission-fusion dynamics, are challenging to survey in their natural habitats. Our objective was evaluate how different flight parameters affect the detectability monkeys videos recorded by drone equipped thermal infrared camera examine level agreement between coders. We used generalized linear mixed models impact speed (2, 4, 6 m/s), height (40, 50 m above ground level), angle (-45°, -90°) on monkey counts closed-canopy forest Yucatan Peninsula, Mexico. results indicate that none three affected number detected monkeys. Agreement coders "substantial" (Fleiss' kappa coefficient = 0.61-0.80) most cases for thermal-contrast zones. study contributes development standardized protocols, which essential obtain accurate data presence abundance wild populations. Based our results, we recommend performing surveys other medium-sized mammals small commercial at 4 m/s speed, 15 canopy height, -90° angle. However, these recommendations may vary depending size noise produced model.
Language: Английский
Citations
2
Bioacoustics, Journal Year: 2023, Volume and Issue: 32(6), P. 660 - 678
Published: Aug. 25, 2023
Passive acoustic monitoring (PAM) has become a popular approach for terrestrial species monitoring. Studies determining detection ranges and predictors of probability are needed accurate ecological modelling based on PAM data. We conducted playback experiment to evaluate factors affecting call detectability in neotropical forest. used Geoffroy´s spider monkeys as model broadcast their contact calls at seven distances from autonomous recording units (ARUs) positioned different heights, forest patches ages, controlled climate conditions during broadcasting trials. Using GLMMs (N = 1,342 data points), we found that increased the smaller difference between ARU speaker height. further range be wider younger surveyed patch is. To test whether these effects were related structural signal characteristics, included vocalisations sympatric 9,394). peak frequency modulate effect height difference, bandwidth age detectability. Our study sheds light influencing emphasises need consider climatic habitat variables when designing programmes.
Language: Английский
Citations
2
Published: Dec. 25, 2023
This paper presents the preliminary design of a drone-based wildlife monitoring and conservation system that aims to improve enhance population detect illegal activities in national parks across globe. The proposed make use flexibility systems access remote locations hazardous environments at lower cost overcome limitations traditional methods such as ground surveys manned aircraft. will be able assist populations analyzing current efforts by providing trend analyses play very important role identifying threats detecting animal poaching trespassing. UAV is designed through study meteorological history Koyna Wildlife Reserve India Sri Lanna National Park Thailand case studies. Results from analysis indicate implementation based would approximately $7200 per system. incorporation Machine learning streamline effectives has also been this paper.
Language: Английский
Citations
2
Drones, Journal Year: 2024, Volume and Issue: 8(9), P. 500 - 500
Published: Sept. 19, 2024
Drones are increasingly used for monitoring wildlife, and it is therefore necessary to evaluate their impact on animal behavior. According the landscape of fear framework, animals assess respond perceived risks in environment by adjusting behavior space use avoid potential threats. Understanding how drones influence risk perception thus crucial generating stress altering animal’s natural Geoffroy’s spider monkeys (Ateles geoffroyi) endangered arboreal primates, but information distribution abundance scarce throughout geographical distribution. can aid rapidly obtain such information, data needed design surveys that minimize disturbance (i.e., any interference or modification caused presence operation drones). Here, we evaluated whether drone flights influenced following monkey behaviors: agonistic displays, self-scratching, whinny vocalizations, feeding, resting, social interactions, moving. We also effect three flight parameters, height (35, 50 m above ground level), speed (2, 4 m/s), distance (“close”, “medium”, “far”) examined repeated exposure resulted tolerance lack a behavioral response). found only displays resting parameter affecting behaviors was between drone. developed displays. Based our results, suggest do not perceive as major sources (such predators) short term, be viable option study this species if adequate protocols implemented.
Language: Английский
Citations
0
Springer eBooks, Journal Year: 2023, Volume and Issue: unknown, P. 127 - 157
Published: Jan. 1, 2023
Language: Английский
Citations
0