ORCID Profile
0000-0002-2839-1301
Current Organisations
University of the Philippines Mindanao
,
Philippine Eagle Foundation
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Publisher: The Raptor Research Foundation, Inc.
Date: 12-2015
Publisher: Wilson Ornithological Society
Date: 09-2003
DOI: 10.1676/01-054
Publisher: Wildlife Information Liaison Development Society
Date: 26-04-2023
DOI: 10.11609/JOTT.8213.15.4.22927-22939
Abstract: Wildlife, such as non-volant mammals and birds, play a vital role in the maintenance of ecosystem health. They are considered ecological engineers that influence forest vegetation. However, due to deforestation, habitat loss, and human persecution, its population status has declined over the years. This study aimed to conduct a species inventory and assess the relative abundance of non-volant mammals and birds in the unprotected regions of the Mt. Apo Range, Philippines, through camera trapping methods. Furthermore, the anthropogenic threats observed in the study areas were also documented. A total of 1,106 camera trap days were carried out in 2016 and another 500 days in 2020. Based on 260 independent sequences for both the 2016 and 2020 surveys, 12 species were identified, consisting of eight non-volant mammals and four birds. Among the identified species are the Endangered Philippine Brown Deer Rusa marianna & Philippine Long-tailed Macaque Macaca fascicularis philippensis and the Vulnerable Giant Scops-owl Otus gurneyi & the Philippine Warty Pig Sus philippensis. Video evidence of the Philippine Warty Pig Sus philippensis performing an important ecological role as an ecological engineer in the Philippine tropical forests were also captured for the first time. Another 61 independent sequences of unidentified rodents were detected in the camera traps, requiring further species monitoring techniques. Conservation must be strengthened beyond the protected landscapes of the Mt. Apo Range through community-based forest governance. This will ensure that the forest vertebrates are protected and conserved from further anthropogenic pressures.
Publisher: International Association for Multidisciplinary Research (IAMURE)
Date: 26-10-2013
Abstract: Earthworms play an important role in the ecosystem as keystone species on soilformation. They loosen and aerate the soil as they tunnel the ground affecting thehydrology cycle. Earthworms in their natural habitats improve soil structure, fertility,and the rate that organic matter gets broken down. Yet, they are less known inthe Philippines. Here, inventory of earthworms in the mossy and montane forests of Mt. Hilong-hilong, Diwata Range, Agusan del Norte was conducted in 15 daysto provide information on species composition and richness using digging, handsorting and counting methods. Twenty six species were identified and six were undetermined.Twenty species were disconcordant in the mossy and 17 species in themontane forest. Species ersity was higher in the mossy forest H’ = 2.788 comparedwith montane forest H’ = 2.674. Similarity of species composition showedlow Si=25.33% between the mossy and montane forests which implies that mossyand montane forests are two unique habitats for earthworms in Mt. Hilong-hilong.It is recommended that cast formation and biology of these earthworms be studiedas future source of vermicast organic fertilizer production rather than using exoticstocks.
Publisher: Wildlife Information Liaison Development Society
Date: 26-11-2016
DOI: 10.11609/JOTT.2301.8.13.9505-9511
Abstract: Two pieces of information are minimally required to conserve endangered raptor species — (i) an estimate of its remaining global population, and (ii) the main factors responsible for its decline. Data suggest that no more than 400 adult pairs of the Critically Endangered Philippine Eagle could remain in the wild. As to what is causing population decline, shooting and hunting continue to be the primary factor while forest habitat loss is another. This paper reflects on the growing incident of human-caused deaths in Philippine Eagles, prominently on Mindanao Island where estimates suggest more than half of the eagle’s wild population exists. By analyzing data from eagle rescues, surveys, and field monitoring through radio and satellite tracking techniques, this paper shows that shooting and trapping is a “clear and present” danger which may potentially drive the population to extinction even when suitable forest habitats still exist. Cases of death within the last decade show that the nature and/or extent of law enforcement, conservation education, and population and habitat monitoring fall short of being effective deterrents to eagle persecution in the wild. We review emerging theories on wildlife crime and cases of community-based species conservation to justify a holistic and grounded approach to preventing eagle poaching as an alternative to the conservation status quo.
Publisher: Wiley
Date: 18-10-2010
Publisher: Cold Spring Harbor Laboratory
Date: 30-11-2021
DOI: 10.1101/2021.11.29.470363
Abstract: Many range-restricted taxa are currently experiencing population declines yet lack fundamental information regarding distribution and population size. Establishing baseline estimates for both these key biological parameters is however critical for directing conservation planning for at-risk range-restricted species. The International Union for the Conservation of Nature (IUCN) Red List uses three range metrics that define species distributions and inform extinction risk assessments: extent of occurrence (EOO), area of occupancy (AOO) and area of habitat (AOH). However, calculating all three metrics using standard IUCN approaches relies on a geographically representative s le of locations, which for rare species is often spatially biased. Here, we apply model-based interpolation using Species Distribution Models (SDMs), correlating occurrences with remote-sensing covariates, to calculate IUCN range metrics, protected area coverage and a global population estimate for the Critically Endangered Philippine Eagle ( Pithecophaga jefferyi ). Our final range wide continuous SDM had high predictive accuracy (Continuous Boyce Index = 0.927) and when converted to a binary model estimated an AOH = 23,185 km 2 , a maximum EOO = 605,759 km 2 , a minimum EOO = 272,272 km 2 , with an AOO = 53,867 km 2 . Based on inferred habitat from the AOH metric, we estimate a global population of 318 breeding pairs (range: 258-362 pairs), or 636 mature in iduals, across the Philippine Eagle global range. Protected areas covered 34 % of AOH, 15 % less than the target representation, with the continuous model identifying key habitat as priority conservation areas. We demonstrate that even when occurrences are geographically biased, robust habitat models can be built that enable quantification of baseline IUCN range metrics, protected area coverage, and a population size estimate. In the absence of adequate location data for many rare and threatened taxa, our method is a promising spatial modelling tool with widespread applications, in particular for island endemics facing high extinction risk.
Publisher: Institute for Biodiversity and Ecology
Date: 12-10-2023
Publisher: Liceo de Cagayan University
Date: 02-12-2010
Publisher: Cold Spring Harbor Laboratory
Date: 20-05-2022
DOI: 10.1101/2022.05.19.492630
Abstract: Quantifying home range size and habitat resource selection are important elements in wildlife ecology and are useful for informing conservation action. Many home range estimators and resource selection functions are currently in use. However, both methods are fraught with analytical issues inherent within autocorrelated movement data from irregular s ling and interpretation of resource selection model parameters to inform conservation management. Here, we apply satellite telemetry and remote sensing technologies to provide first estimates of home range size and resource selection for six adult Philippine Eagles ( Pithecophaga jefferyi ), using five home range estimators and non-parametric resource selection functions. From all home range estimators, the median 95 % home range size was between 39-68 km 2 (range: 22-161 km 2 ), with the 50 % core range size between 6-13 km 2 (range: 5-33 km 2 ). The space-time autocorrelated kernel density estimate (AKDE) had the largest median 95 % home range size = 68 km 2 and a 50 % core range = 13 km 2 . Local convex hulls (LoCoH) estimated the smallest median 95 % home range = 39 km 2 and a 50 % core range = 6 km 2 . From the resource selection functions, all adults used areas high in photosynthetic leaf and canopy structure but avoided areas of old growth biomass and denser areas of vegetation, possibly due to foraging forays into fragmented areas away from nesting sites. For the first time, we determine two important spatial processes for this Critically Endangered raptor that can help in directing conservation management. Rather than employing a single home range estimator, we recommend that analysts consider multiple approaches to animal movement data to fully explore space-time and resource use.
Start Date: 2015
End Date: 2016
Funder: Whitley Fund for Nature
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