A review of the distribution of the Crested Eagle, Morphnus guianensis (Daudin, 1800) (Accipitridae: Harpiinae), including range extensions

Gomes, Felipe Bittioli R.; Sanaiotti, Tânia Margarete

doi:10.1007/bf03544289

Cited by 4 publications

(11 citation statements)

References 21 publications

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“…2009). Three additional occurrence datasets for both the crested eagle (Gomes & Sanaiotti 2015) and harpy eagle range (Vargas González & Vargas 2011; Miranda et al . 2019) were also incorporated into our dataset.…”

Section: Methodsmentioning

confidence: 99%

“…We sourced crested and harpy eagle occurrences from the Global Raptor Impact Network (GRIN, McClure et al 2021) consisting of occurrence data from the Global Biodiversity Information Facility (GBIF 2019a,b), which are mostly eBird records (crested eagle = 75 %, harpy eagle = 79 %, Sullivan et al 2009). Three additional occurrence datasets for both the crested eagle (Gomes & Sanaiotti 2015) and harpy eagle range (Vargas González & Vargas 2011;Miranda et al 2019) were also incorporated into our dataset. We cleaned occurrences by removing duplicate records, and those with no geo-referenced location.…”

Section: Eagle Occurrence Datamentioning

confidence: 99%

“…Compared to temperate regions, current knowledge on the environmental drivers of distribution for many Neotropical raptors is limited (Buechley et al 2019), despite the Neotropics being a raptor diversity hotspot (McClure et al 2018). Among Neotropical forest raptors, the crested eagle (Morphnus guianensis) and harpy eagle (Harpia harpyja) have almost identical geographical ranges across Central and South America, occurring widely across lowland broadleaf rainforests (Ferguson-Lees & Christie 2005;Gomes & Sanaiotti 2015;Miranda et al 2019;Sutton et al 2021a,b). Both species are uncommon with low population densities, with the harpy eagle being on average ~1.3 times larger than the crested eagle (Ferguson-Lees & Christie 2005).…”

Section: Introductionmentioning

confidence: 99%

“…2018). Among Neotropical forest raptors, the crested eagle ( Morphnus guianensis ) and harpy eagle ( Harpia harpyja ) have almost identical geographical ranges across Central and South America, occurring widely across lowland broadleaf rainforests (Ferguson-Lees & Christie 2005; Gomes & Sanaiotti 2015; Miranda et al . 2019; Sutton et al .…”

Section: Introductionmentioning

confidence: 99%

“…Future research should thus focus on habitat use at finer scales, for example testing for differences in nesting elevation. Harpy eagles generally nest below 350 m/asl(Vargas González & Vargas 2011;Vargas González et al 2020) but crested eagles are known to breed at higher elevations(Gomes & Sanaiotti 2015).…”

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confidence: 99%

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Habitat resource overlap in two broad-ranged sympatric Neotropical forest eagles

Sutton

Anderson

Franco

et al. 2022

Preprint

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Quantifying resource partitioning between co-occurring species has important ecological and evolutionary implications. Yet, few studies compare resource overlap in both geographic and environmental space. We test whether the habitat requirements of two closely related Neotropical forest eagles, the crested eagle (Morphnus guianensis) and harpy eagle (Harpia harpyja), differ at fine and coarse resolutions across their shared geographic range. Using landcover and topographic covariates, we quantified resource overlap first using higher resolution (30 arc-sec data) generalized linear models (GLMs), and second using coarser-grain (2.5 arc-min data) environmental ordination. The distribution of both eagles was largely explained by canopy species richness and structural complexity with evergreen forest, but with differing responses to landcover and topography, particularly with the harpy eagle more likely in areas of dense evergreen forest. Both eagles were negatively associated with mosaic forest, with this relationship stronger for the crested eagle. Harpy eagle distribution was restricted by higher elevation and terrain roughness, compared to the crested eagle, whose distribution was more restricted by canopy species richness and structure. From the GLMs, resource overlap was > 92 % in geographical space but reduced to 64 % in environmental space. From ordination, resource overlap was 76 % in environmental space, with randomization tests supporting equivalent environmental space for both eagles. Our results suggest that at the biogeographical scale, crested and harpy eagles share environmental space, but there may be subtle differences in fine-scale habitat preference. We recommend habitat resource overlap be assessed in both geographical and environmental space at multiple resolutions to capture the inherent variability in environmental conditions available to co-occurring species.

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Section: Methodsmentioning

confidence: 99%

Section: Eagle Occurrence Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Habitat resource overlap in two broad-ranged sympatric Neotropical forest eagles

Sutton

Anderson

Franco

et al. 2022

Preprint

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The rediscovery of the Crested Eagle (Morphnus guianensis) in Rio Grande do Sul state, Brazil

et al. 2021

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Multi‐scale habitat overlap in two broad‐ranged sympatric Neotropical forest eagles reveals shared environmental space and habitat use

Sutton

Anderson

Franco

et al. 2023

Ibis

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Quantifying resource partitioning between co‐occurring species can provide insight into processes facilitating coexistence by closely related species, a fundamental question in ecology. We tested whether the habitat requirements of two closely related Neotropical forest eagles, the Crested Eagle Morphnus guianensis and Harpy Eagle Harpia harpyja, differ at fine and coarse resolutions across their shared geographical range. Using landcover and topographical covariates, we quantified potential resource overlap first using higher resolution (30 arc‐s, ~ 1‐km2 data) generalized linear models (GLMs), and secondly using coarser‐grain (2.5 arc‐min, ~ 4.5‐km2 data) environmental ordination to capture the potential effect of scale on habitat overlap. The distribution of both eagles was largely explained by canopy tree species richness and canopy structural complexity, with peak suitability of 60–80% evergreen forest cover. Both eagles were negatively associated with mosaic forest and cultivated areas. From the GLMs, habitat overlap was >93% in geographical space but was reduced to 73% when considering environmental space, a proxy for resource overlap. From ordination (principal component analysis), resource overlap was 67% in environmental space, with randomization tests supporting equivalent environmental space for both eagles. Our results suggest that at the continental scale, Crested and Harpy Eagles share identical environmental space when quantified at fine and broad scales, with little difference in distribution and habitat use. At the continental scale used here, both eagles can coexist, presumably with sufficient habitat heterogeneity for coexistence when they occur in close proximity. Therefore, further research is required at the local level to capture fully where coexistence at the local scale is facilitated more by fine‐scale habitat selection, or difference in diet between two species with indistinguishable habitat use.

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A review of the distribution of the Crested Eagle, Morphnus guianensis (Daudin, 1800) (Accipitridae: Harpiinae), including range extensions

Cited by 4 publications

References 21 publications

Habitat resource overlap in two broad-ranged sympatric Neotropical forest eagles

Habitat resource overlap in two broad-ranged sympatric Neotropical forest eagles

The rediscovery of the Crested Eagle (Morphnus guianensis) in Rio Grande do Sul state, Brazil

Multi‐scale habitat overlap in two broad‐ranged sympatric Neotropical forest eagles reveals shared environmental space and habitat use

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