Drone imaging of elasmobranchs: Whale sharks and golden cownose rays co-occurrence in a zooplankton hot-spot in southwestern Sea of Cortez

Frixione, Martín G.; García, Miguel de J. Gómez; Gauger, Marco F. W.

doi:10.1016/j.fooweb.2020.e00155

Cited by 12 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Frixione et al (2020) [17] Methodology Real-time autonomous shark alerting using cloud-hosted machine learning detection algorithms Not reported Gorkin et al (2020) [29] Fine-scale movement and behaviour…”

Section: Golden Cownose Ray (Rhinoptera Steindachneri)mentioning

confidence: 99%

“…Drones can also be used for long-term monitoring of animal populations via photo identification [40], and subsequent analyses such as morphometric data can be automated [41,42]. The capabilities of drones in observing fine-scale ray movement and schooling as well as more opportunistic behaviours, such as natural feeding events, have been demonstrated [17,18,26]. Opportunities exist to innovatively utilise these capabilities in a variety of contexts within ray research.…”

Section: Drones As a Tool To Monitor Ray Behaviourmentioning

confidence: 99%

“…While costly tagging and animalborne video continue to be used to monitor the long-term migratory movements of rays along coastlines [10][11][12][13][14][15][16], drones represent an effective solution for monitoring fine-scale movement and behaviour in a cost-efficient, minimally invasive manner. While a handful of studies have incidentally documented the abundance of rays with drones (Table 1), there have only been two studies that have used drones to investigate ray behaviour specifically [17,18]. In contrast, shark behaviours have been extensively examined with drones in similar environments [19], and while drone-specific operational protocols exist Southern stingray (Dasyatis americana) Spotted eagle ray (Aetobatus narinari) Hensel et al (2018) [24] Methodology testing Assessing the effectiveness of deep learning object detectors in the surveillance and estimation of marine animals from drone footage in real time Not reported Saqib et al (2018) [25] Abundance Compared precision of real-time helicopter and drone counts, as well as post-hoc analysis of drone footage Not reported in abstract Kelaher et al (2019a) [26] Abundance Assessing variation in assemblages of large marine fauna off ocean beaches using drones…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Going Batty: The Challenges and Opportunities of Using Drones to Monitor the Behaviour and Habitat Use of Rays

Oleksyn

Tosetto

Raoult

et al. 2021

Drones

View full text Add to dashboard Cite

The way an animal behaves in its habitat provides insight into its ecological role. As such, collecting robust, accurate datasets in a time-efficient manner is an ever-present pressure for the field of behavioural ecology. Faced with the shortcomings and physical limitations of traditional ground-based data collection techniques, particularly in marine studies, drones offer a low-cost and efficient approach for collecting data in a range of coastal environments. Despite drones being widely used to monitor a range of marine animals, they currently remain underutilised in ray research. The innovative application of drones in environmental and ecological studies has presented novel opportunities in animal observation and habitat assessment, although this emerging field faces substantial challenges. As we consider the possibility to monitor rays using drones, we face challenges related to local aviation regulations, the weather and environment, as well as sensor and platform limitations. Promising solutions continue to be developed, however, growing the potential for drone-based monitoring of behaviour and habitat use of rays. While the barriers to enter this field may appear daunting for researchers with little experience with drones, the technology is becoming increasingly accessible, helping ray researchers obtain a wide range of highly useful data.

show abstract

Section: Golden Cownose Ray (Rhinoptera Steindachneri)mentioning

confidence: 99%

Section: Drones As a Tool To Monitor Ray Behaviourmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Going Batty: The Challenges and Opportunities of Using Drones to Monitor the Behaviour and Habitat Use of Rays

Oleksyn

Tosetto

Raoult

et al. 2021

Drones

View full text Add to dashboard Cite

show abstract

“…Twelve research articles related to using drones to observe natural animal behaviour, mostly from 2018 onwards. All but one of these research articles ) concerned aquatic taxa ) such as elasmobranchs Frixione et al 2020;, crocodilians (Gallagher et al 2018), turtles , and cetaceans .…”

Section: Purposes Of Drone Flightsmentioning

confidence: 99%

An examination of trends in the growing scientific literature on approaching wildlife with drones

Bonatakis

2022

Drone Syst. Appl.

View full text Add to dashboard Cite

Drones or unoccupied aerial vehicles are rapidly being used for a spectrum of applications, including replacing traditional occupied aircraft as a means of approaching wildlife from the air. Though less intrusive to wildlife than occupied aircraft, drones can still cause varying levels of disturbance. Policies and protocols to guide lowest-impact drone flights are most likely to succeed if considerations are derived from knowledge from scientific literature. This study examines trends in the scientific literature on using drones to approach wildlife between 2000 and 2020, specifically in relation to the type of publications, scientific journals works are published in, the purposes of drone flights reported, taxa studied, and locations of studies. From 223 publications, we observed a large increase in relevant scientific literature, the majority of which were peer-reviewed articles published across 87 scientific journals. The largest proportions of peer-reviewed research articles related to aquatic mammals or aquatic birds, and the use or trial of drone flights for conducting population surveys, animal detection or investigations of animal responses to drone flights. The largest proportion of articles were studies conducted in North America and Australia. Since animal responses to drone flights vary between taxa, populations, and geographic locations, we encourage further growth in the volume of relevant scientific literature needed to inform policies and protocols for specific taxa and/or locations, particularly where knowledge gaps exist.

show abstract

“…Currently no trophic information exists for R. neglecta, and their ecology has only been assumed from congenerics, for example R. bonasus, whose diet varies with ontogeny and across populations Bade et al, 2014;Collins et al, 2007), and the Pacific cownose ray (R. steindachneri Evermann & Jenkins 1891), a species that can switch diets depending on the availability of prey and has been observed feeding among planktivorous whale sharks (Rhincodon typus Smith 1828; Ehemann et al, 2019;Frixione et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Trophic niche of Australian cownose rays (Rhinoptera neglecta) and whitespotted eagle rays (Aetobatus ocellatus) along the east coast of Australia

Chan

Raoult

Jaine

et al. 2022

Journal of Fish Biology

View full text Add to dashboard Cite

Australian cownose rays (Rhinoptera neglecta) and whitespotted eagle rays (Aetobatus ocellatus) are large myliobatiform rays that co‐occur off temperate eastern Australia. Here, we performed stable‐isotope analyses (δ13C, δ15N and δ34S) on fin clips of both species to gain insights into their trophic interactions and isotopic niches, and assess the effect of preservation (ethanol‐stored versus frozen) on isotopic values of fin‐clip tissue of R. neglecta. Linear mixed models identified species as the main factor contributing to variation among δ15N and δ34S values, and disc width for δ13C. Bayesian ecological niche modelling indicated a 57.4% to 74.5% overlap of trophic niches, with the niche of R. neglecta being smaller and more constrained. Because values of δ13C were similar between species, variation in isotopic niches were due to differences in δ15N and δ34S values. Linear mixed models failed to detect differences in isotopic values of ethanol‐stored and frozen fin tissue of R. neglecta. This study provides the first examination of the trophic ecology of R. neglecta and the comparison of isotopic niche with A. ocellatus, which will facilitate future research into the trophic interactions of these species and aid better resource management.

show abstract

Drone imaging of elasmobranchs: Whale sharks and golden cownose rays co-occurrence in a zooplankton hot-spot in southwestern Sea of Cortez

Cited by 12 publications

References 18 publications

Going Batty: The Challenges and Opportunities of Using Drones to Monitor the Behaviour and Habitat Use of Rays

Going Batty: The Challenges and Opportunities of Using Drones to Monitor the Behaviour and Habitat Use of Rays

An examination of trends in the growing scientific literature on approaching wildlife with drones

Trophic niche of Australian cownose rays (Rhinoptera neglecta) and whitespotted eagle rays (Aetobatus ocellatus) along the east coast of Australia

Contact Info

Product

Resources

About