A DECADE MONITORING ON THE POPULATION OF CRITICALLY ENDANGERED Cacatua sulphurea abbotti, ON MASAKAMBING ISLAND, INDONESIA
Cacatua sulphurea abbotti is an endemic subspecies of cockatoo that is exclusive to a single tiny Masakambing island, with Critically Endangered status. There is an urgent need to obtain data on the status and distribution of the wild populations in order to determine conservation strategy of this species. We present population data collected since 2008 by direct roost count method in sleeping tree each year. The fieldwork recorded only 10 cockatoos in 2008, but it continued increasing up to 22 birds in 2018 or 42.86%, in a decade. The distribution range cover about 63% of the size of the island, concentrated in north-western area with a density of 2.06 birds/km2 in year 2008 and rose up to 4.54 birds/km2 in 2018. Zero trapping policy enforced by local government seemed to be effective in preventing population decline, although the population is still vulnerable to decline due to nesting failure, presumably low genetic quality, and habitat destruction.
Key words: Cacatua sulphurea abbotti, critically endangered, decade monitoring, Masakambing, population
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