Like night and day: Reversals of thermal gradients across ghost crab burrows and their implications for thermal ecology

Watson, Gregory S.; Gregory, Emily A.; Johnstone, C.W.; Berlino, M.; Green, David W.; Peterson, Nicola; Schoeman, David S.; Watson, Jolanta A.

doi:10.1016/j.ecss.2018.01.023

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…All sites were at a height between 10 and 15 m above sea level. Kangaroo populations in and around the study areas have declined in recent years [20] and kangaroo mob sizes at all three sites were low (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) during the study period, with an average group size of four.…”

Section: Introductionmentioning

confidence: 96%

Evaluating the Efficacy and Optimal Deployment of Thermal Infrared and True-Colour Imaging When Using Drones for Monitoring Kangaroos

Brunton

Leon

Burnett

2020

Drones

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Advances in drone technology have given rise to much interest in the use of drone-mounted thermal imagery in wildlife monitoring. This research tested the feasibility of monitoring large mammals in an urban environment and investigated the influence of drone flight parameters and environmental conditions on their successful detection using thermal infrared (TIR) and true-colour (RGB) imagery. We conducted 18 drone flights at different altitudes on the Sunshine Coast, Queensland, Australia. Eastern grey kangaroos (Macropus giganteus) were detected from TIR (n=39) and RGB orthomosaics (n=33) using manual image interpretation. Factors that predicted the detection of kangaroos from drone images were identified using unbiased recursive partitioning. Drone-mounted imagery achieved an overall 73.2% detection success rate using TIR imagery and 67.2% using RGB imagery when compared to on-ground counts of kangaroos. We showed that the successful detection of kangaroos using TIR images was influenced by vegetation type, whereas detection using RGB images was influenced by vegetation type, time of day that the drone was deployed, and weather conditions. Kangaroo detection was highest in grasslands, and kangaroos were not successfully detected in shrublands. Drone-mounted TIR and RGB imagery are effective at detecting large mammals in urban and peri-urban environments.

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Section: Introductionmentioning

confidence: 96%

Evaluating the Efficacy and Optimal Deployment of Thermal Infrared and True-Colour Imaging When Using Drones for Monitoring Kangaroos

Brunton

Leon

Burnett

2020

Drones

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“…raccoons and crows, Lim et al, 2011). Temperatures at burrow depth have been reported to be lower and more stable than at the surface (Chan et al, 2006;Watson et al, 2018). Additionally, larger ghost crabs are able to burrow deeper to follow the water table level of the beach, which allows them to adapt to drier conditions (Strachan et al, 1999;Tureli et al, 2009).…”

Section: Ghost Crab Density and Size Distribution Across Different Th...mentioning

confidence: 99%

“…upper thermal tolerance limits, resting metabolic rate), foraging behaviors (Weinstein, 1998), burrowing dynamics (i.e. shape, depth, Chan et al, 2006;Tureli et al, 2009;Watson et al, 2018), and patterns of sea-to-shore axis distribution at different beaches (Strachan et al, 1999;Rodrigues et al, 2016) would be an important step to understand the thermal ecology of ghost crabs, also contributing to a better understanding of their interactions with sea turtle clutches.…”

Section: Ghost Crab Density and Size Distribution Across Different Th...mentioning

confidence: 99%

“…Additionally, ghost crabs of the species O. cursor, being generally pale to yellowish, may lose their mimicry ability in darker sand colorations, becoming more vulnerable to predation or even be seen by their preys. Although there is not a clear pattern, studies suggest that both their distribution and level of predation on loggerhead clutches may vary across different thermal conditions (Watson et al, 2018;Tiralongo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Ghost crab predation of loggerhead turtle eggs across thermal habitats

Martins

Marco

Patiño-Martínez

et al. 2022

Journal of Experimental Marine Biology and Ecology

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“…Established trees supply propagules to local sites, thus accelerating forest development (McKee 1995). Additionally, trees provide habitats for crabs, which are constrained by the unvegetated salt flats where food is rare and high daytime temperatures are hostile to ectotherms (Watson et al 2018). Mangrove trees benefit in turn from faunal soil improvements.…”

Section: Introductionmentioning

confidence: 99%

Aerial surveys reveal biotic drivers of mangrove expansion along a Thai salt flat ecotone

Pranchai

Jenke

Pokavanich

et al. 2022

Restoration Ecology

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Rapid sea level rise (SLR) could overwhelm the adaptive capacity of many mangrove forests. The conservation of functional mangrove ecosystems will rely on their expansion into upper intertidal areas, including salt marshes and salt flats, in advance of SLR. The development of new mangrove habitats could be accelerated by amplifying positive biotic interactions among herbaceous plants, macrofauna, and mangrove trees, such as trapping of hydrochorous propagules or site amelioration. It was investigated how biotic and abiotic factors influenced the expansion of mixed-species mangrove stands along a mangrove-salt flat ecotone. Multi-temporal unmanned aerial vehicle (UAV) imagery (< 1 cm/pixel) was used to monitor seedlings of Avicennia alba, Bruguiera cylindrica, and Lumnitzera racemosa in three sample plots (0.7-0.9 ha) over 2 years. The aerial images were used to map mangrove crowns, sedges (Fimbristylis tetragona), substrate elevation, and microtopography. The spatial distribution of seedlings was modeled using point pattern processes; mixed-effects models were used to analyze how environmental factors influenced seedling survival and growth. The spatio-temporal patterns of mangrove regeneration revealed that sedges and macrofauna facilitated the regeneration of mangroves into higher-elevated areas of low tree density. Sedges not only trapped seeds but also increased the likelihood of survival among seedlings of all species. Large-sized propagules established in undulating microtopography created through the bioturbation of macrofauna. Herbaceous vegetation expanded the range of macrofauna in the absence of trees. Thus, the migration of mangroves into hypersaline retreat areas may be accelerated by enhancing the growth of herbaceous vegetation and promoting burrowing macrofauna.

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Like night and day: Reversals of thermal gradients across ghost crab burrows and their implications for thermal ecology

Cited by 12 publications

References 40 publications

Evaluating the Efficacy and Optimal Deployment of Thermal Infrared and True-Colour Imaging When Using Drones for Monitoring Kangaroos

Evaluating the Efficacy and Optimal Deployment of Thermal Infrared and True-Colour Imaging When Using Drones for Monitoring Kangaroos

Ghost crab predation of loggerhead turtle eggs across thermal habitats

Aerial surveys reveal biotic drivers of mangrove expansion along a Thai salt flat ecotone

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