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Extensive protected area coverage and an updated global population estimate for the Endangered Madagascar Serpent-eagle Eutriorchis astur

Published online by Cambridge University Press:  27 February 2023

Luke J. Sutton Open the ORCID record for Luke J. Sutton [Opens in a new window] ,
Armand Benjara ,
Lily-Arison Rene de Roland ,
Russell Thorstrom  and
Christopher J. W. McClure Open the ORCID record for Christopher J. W. McClure [Opens in a new window]
Luke J. Sutton*
Affiliation:
The Peregrine Fund, 5668 West Flying Hawk Lane, Boise, ID 83709 USA
Armand Benjara
Affiliation:
The Peregrine Fund’s Madagascar Project, BP4113 Antananarivo (101), Madagascar
Lily-Arison Rene de Roland
Affiliation:
The Peregrine Fund’s Madagascar Project, BP4113 Antananarivo (101), Madagascar
Russell Thorstrom
Affiliation:
The Peregrine Fund, 5668 West Flying Hawk Lane, Boise, ID 83709 USA
Christopher J. W. McClure
Affiliation:
The Peregrine Fund, 5668 West Flying Hawk Lane, Boise, ID 83709 USA
*
*Author for correspondence: Luke J. Sutton, Email: lsutton@peregrinefund.org
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Summary

Knowledge gaps regarding distribution, habitat associations, and population size for rare and threatened range-restricted taxa lead to uncertainty in directing conservation action. Quantifying range metrics and species–habitat associations using Species Distribution Models (SDMs) with remote-sensing habitat data can overcome these setbacks by establishing baseline estimates for biological parameters critical for conservation assessments. Area of Habitat (AOH) is a new range metric recently developed by the International Union for Conservation of Nature (IUCN) Red List. AOH seeks to quantify inferred habitat within a species’ range to inform extinction risk assessments. Here, we used SDMs correlating occurrences with remote-sensing covariates to calculate a first estimate of AOH for the Endangered Madagascar Serpent-eagle Eutriorchis astur, and then updated additional IUCN range metrics and the current global population estimate. From these baselines we then conducted a gap analysis assessing protected area coverage. Our continuous SDM had robust predictive performance (Continuous Boyce Index = 0.835) and when reclassified to a binary model estimated an AOH = 30,121 km2, 13% less than the current IUCN range map. We estimated a global population of 533 mature individuals derived from the Madagascar Serpent-eagle AOH metric, which was within current IUCN population estimates. The current protected area network covered 95% of AOH, with the binary model identifying three additional key habitat areas as new protected area designations to fully protect Madagascar Serpent-eagle habitat. Our results demonstrated that correlating presence-only occurrences with remote-sensing habitat covariates can fill knowledge gaps useful for informing conservation action. Applying this spatial information to conservation planning would ensure almost full protected area coverage for this endangered raptor. For tropical forest habitat specialists, we recommend that potential predictors derived from remote sensing, such as vegetation indices and biophysical measures, are considered as covariates, along with other variables including climate and topography.

Keywords

Area of HabitatEutriorchis asturPopulation sizeProtected areasRange metricsRemote sensing
Type
Research Article
Information
Bird Conservation International , Volume 33 , 2023 , e48
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of BirdLife International

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