Population assessment and habitat associations of the Visayan Hornbill(Penelopides panini)in Northwest Panay,Philippines  

作　　者：Holly Isabelle Mynott David Charles Lee Rhea Aranas Santillan Christian Jürgen Schwarz Benjamin Tacud Arcel Dryden Fernandez Daphne Kerhoas 

机构地区：[1]Bristol Zoological Society,Bristol Zoo Gardens,College Road,Clifton,Bristol BS83HA,UK [2]School of Applied Sciences,University of South Wales,Alfred Russel Wallace Building,Upper Glyntaff Campus,Pontypridd CF374BB,UK [3]PhilinCon,L.A.Dioso Memorial Public Library,Iloilo-Antique Road,5712 Pandan,Philippines [4]PhilinCon Germany,Ruhr-Universität Bochum,Universitätsstraße 150,ND 1/31,44801 Bochum,Germany

出　　处：《Avian Research》2021年第4期612-622,共11页鸟类学研究（英文版）

基　　金：funded by the Mohamed bin Zayed Species Conservation Fund(project 192514132);Bristol Zoological Society;DK was employed by Bristol Zoological Society to oversee the project,and HM,BT and AF worked as contractors for Bristol Zoological Society during the survey duration。

摘　　要：Background:Seven out of ten hornbill species in the Philippines are threatened with extinction.Among these is the endangered Visayan Hornbill(Penelopides panini),found on the islands of Panay and Negros.Threatened by habitat loss and hunting,its population size is thought to have declined from 1800 individuals 20 years ago to less than 1000.However,a recent study on Negros estimated 3564 individuals across three core forest blocks.This study aims to quantify the Visayan Hornbill population size in and around the Northwest Panay Peninsula Natural Park(NWPPNP)on Panay,the largest contiguous low-elevation forest landscape remaining across its range,and its broad habitat associations across a gradient of environmental degradation.Methods:Hornbills were surveyed using 10-min distance sampling point counts(n=367)along transects(average length 1.1 km).Environmental variables were recorded along transects,while habitat was classified into primary forest,secondary forest,plantation,or open habitat.Distance software was used to estimate population densities stratified by habitat,with the overall population estimate taken as a mean of habitat density estimates weighted by habitat area.Using generalized linear mixed models,hornbill occurrence was modelled using combinations of nine environmental variables as main and two-way fixed effects.Results:Surveys covered 204.4 km^(2) of the 374.8 km^(2) Northwest Panay Peninsula.Hornbills were not recorded in plantations or open habitats.Hornbill density was significantly higher in primary forest(17.8 individuals/km~2±26.9%CV)than in secondary forest(3.7 individuals/km^(2)±33.2%CV;z=15.212,P<0.001).The overall population estimate for the NWPPNP and environs is 2109 individuals,and 2673 individuals for the entire Northwest Panay Peninsula.Hornbill presence was best explained by a model including distance from the Park boundary alongside five interaction effects and transect as a random effect.Distance,and the interaction between distance and medium-sized trees were significant predi

关 键 词：Distance sampling Endangered species GLMM Hornbill Point count Population size Protected area 

分 类 号：Q958.1[生物学—动物学]