Using Motion-Activated Trail Cameras to Study Diet and Productivity of Cliff-Nesting Golden Eagles

Harrison, Jordan T.; Kochert, Michael N.; Pauli, Benjamin P.; Heath, Julie A.

doi:10.3356/jrr-18-26

Cited by 16 publications

(11 citation statements)

References 31 publications

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“…Such easy acceptance of cameras may be related to these suburban birds' tolerance of disturbance (Dykstra et al 2018) however, and is not necessarily expected of other raptor species, particularly those nesting in more remote environments. Post-installation monitoring of nests with cameras is always appropriate to minimize researcher disturbance (Harrison et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Partial Incubation and Hatching Asynchrony in the Red-Shouldered Hawk (Buteo lineatus)1

Miller

Dykstra²,

Hays³

et al. 2020

Journal of Raptor Research

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Section: Discussionmentioning

confidence: 99%

Partial Incubation and Hatching Asynchrony in the Red-Shouldered Hawk (Buteo lineatus)1

Miller

Dykstra²,

Hays³

et al. 2020

Journal of Raptor Research

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“…However, this approach requires repeated visits to nesting sites, and even sporadic disturbances early in nesting can influence prey delivery rates and cause nest failure in some species (Harrison et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Robinson et al., 2015). However, this approach requires repeated visits to nesting sites, and even sporadic disturbances early in nesting can influence prey delivery rates and cause nest failure in some species (Harrison et al., 2019). Although nest camera analysis can provide highly accurate estimates of nestling diet at a limited scale, it can underrepresent the contribution of small prey and is often limited in scope due to small sample size; technical failure (e.g.…”

Section: Introductionmentioning

confidence: 99%

Bayesian stable isotope mixing models effectively characterize the diet of an Arctic raptor

Johnson

Henderson

Anderson

et al. 2020

Journal of Animal Ecology

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1. Bayesian stable isotope mixing models (BSIMMs) for δ 13 C and δ 15 N can be a useful tool to reconstruct diets, characterize trophic relationships, and assess spatiotemporal variation in food webs. However, use of this approach typically requires a priori knowledge on the level of enrichment occurring between the diet and tissue of the consumer being sampled (i.e. a trophic discrimination factor or TDF). 2. Trophic discrimination factors derived from captive feeding studies are highly variable, and it is challenging to select the appropriate TDF for diet estimation in wild populations. We introduce a novel method for estimating TDFs in a wild population-a proportionally balanced equation that uses high-precision diet estimates from nest cameras installed on a subset of nests in lieu of a controlled feeding study (TDF CAM). 3. We tested the ability of BSIMMs to characterize diet in a free-living population of gyrfalcon Falco rusticolus nestlings by comparing model output to high-precision nest camera diet estimates. We analysed the performance of models formulated with a TDF CAM against other relevant TDFs and assessed model sensitivity to an informative prior. We applied the most parsimonious model inputs to a larger sample to analyse broad-scale temporal dietary trends. 4. Bayesian stable isotope mixing models fitted with a TDF CAM and uninformative prior had the best agreement with nest camera data, outperforming TDFs derived from captive feeding studies. BSIMMs produced with a TDF CAM produced reliable diet estimates at the nest level and accurately identified significant temporal shifts in gyrfalcon diet within and between years. 5. Our method of TDF estimation produced more accurate estimates of TDFs in a wild population than traditional approaches, consequently improving BSIMM diet estimates. We demonstrate how BSIMMs can complement a high-precision diet study by expanding its spatiotemporal scope of inference and recommend this integrative methodology as a powerful tool for future trophic studies.

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“…2016, Harrison et al . 2019). The majority of these approaches collect diet data from the nest‐site and tend to focus on identifying prey delivered during the breeding season.…”

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confidence: 99%

Sex and age differences in the diet of the Eurasian Sparrowhawk (Accipiter nisus) using web‐sourced photographs: exploring the feasibility of a new citizen science approach

Panter

Amar

2021

Ibis

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Diet differences between the sexes and ages have often been recorded for bird species. Many raptor species show extreme sexual size dimorphism, with females often considerably larger than the males and these differences may be reflected in their diets. Diet studies in raptors most frequently focus on analysing prey remains or pellets collected at nest‐sites. These methods are subsequently limited to breeding birds in the breeding season and are also restricted by their inability to distinguish prey items between the sexes. The use of web‐sourced photographs to examine raptor diet has the potential to overcome some limitations of more traditional methods used to assess diet. We used this approach for the Eurasian Sparrowhawk Accipiter nisus in the United Kingdom, exploring diet between the sexes and ages throughout the entire year. In total, we obtained 843 web‐sourced photographs of Sparrowhawks with their prey items. There were 12 key prey items that had a frequency ≥ 10 in the Sparrowhawk diet: Common Wood Pigeon Columba palumbus, Common Starling Sturnus vulgaris, Eurasian Collared Dove Streptopelia decaocto, Rock Dove Columba livia, Common Blackbird Turdus merula, House Sparrow Passer domesticus, unidentified ‘small’ and ‘medium’ birds, European Goldfinch Carduelis carduelis, European Greenfinch Chloris chloris, Eurasian Blue Tit Cyanistes caeruleus and Stock Dove Columba oenas. Several prey species were more often seen in the diet of one sex or age group. Overall, average prey weights of adult females were two and a half times heavier than for adult males and one and a half times heavier for juvenile females. However, this method may be slightly biased towards larger prey items, which should be considered in future studies. Despite this limitation, our method enabled dietary differences between the sexes and ages of this highly sexual size dimorphic raptor species to be explored throughout the year.

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Using Motion-Activated Trail Cameras to Study Diet and Productivity of Cliff-Nesting Golden Eagles

Cited by 16 publications

References 31 publications

Partial Incubation and Hatching Asynchrony in the Red-Shouldered Hawk (Buteo lineatus)1

Partial Incubation and Hatching Asynchrony in the Red-Shouldered Hawk (Buteo lineatus)1

Bayesian stable isotope mixing models effectively characterize the diet of an Arctic raptor

Sex and age differences in the diet of the Eurasian Sparrowhawk (Accipiter nisus) using web‐sourced photographs: exploring the feasibility of a new citizen science approach

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