EN
Pohnpei Cicadabird Edolisoma insperatum



Justification

Justification of Red List Category
This species is estimated to have a small population that is inferred to be undergoing a continuing decline due to the loss of original habitat within its very restricted range. For this reason Pohnpei Cicadabird is evaluated as Endangered.

Population justification
The global population size was estimated at 2060 birds in 1983 (Engbring 1990), but since that time a large proportion of native forest has been lost from the island. Surveys in 2012 only recorded the species 8 times from 247 widely distributed survey stations (Oleiro and Kessler unpub. rep.), and generally reported decreases in forest associated species. The population is is placed in the band 1,000-2,499 individuals, equating to 667-1,666 mature individuals which is rounded here to 600-1,700 mature individuals.

Trend justification
The population is suspected to be stable in the absence of evidence for any declines or substantial threats.

Distribution and population

Edolisoma inseperatum is endemic to the island of Pohnpei in the eastern Caroline Islands, Federated States of Micronesia (Engbring et al. 1990, Taylor 2016).

Ecology

The species has been recorded in mangrove and evergreen forest habitat up to 800 m, and appears to be associated largely with primary habitats on the island (Oleiro and Kessler 2014).

Threats

Overall, there was a reduction of undisturbed upland forest on Pohnpei of over 60% from 1975 to 1995 (Buden 1996, 2000, B. Raynor in litt. 1995, 2012). The majority of the island's forests have been to various degrees converted or at least degraded to mixed forest (native species mixed with lowland secondary species), largely attributable to the cultivation of sakau (= kava) Piper methysticum as a major cash-crop (B. Raynor in litt. 2012). The fragmentation of such forest by sakau clearings also introduces and encourages the spread of invasive species in isolated areas throughout the forest. Although efforts over the past 20 years to reduce the amount of clear-cutting for sakau plantations have resulted in the slowing of native forest conversion rates, the trend remains negative (B. Raynor in litt. 2012).

Conservation actions

Conservation Actions Underway
Campaigns have been successful at reducing forest clearance for agriculture by encouraging cultivation at lower elevations, 'grow low', (Buden 2000). However, there has been resistance to the latter because sakau grows better on wet mountain slopes and crops are likely to be safer in more remote areas (Buden 2000).

Conservation Actions Proposed
Conduct surveys to obtain an up-to-date population estimate. Monitor trends in the species's population and land use patterns on Pohnpei. Increase the area of primary forest that is protected. Encourage management practices that preserve large trees with holes and cavities and large Xylocarpus mangroves (Engbring et al. 1990).

Identification

25 cm. A slender-bodied sexually-dimorphic cicadabird where the slate-grey male much resembles E. nesiotis, but the female is much different being largely a rich uniform chestnut colour,

Acknowledgements

Text account compilers
Butchart, S., Ekstrom, J. & Martin, R

Contributors
Dutson, G.


Recommended citation
BirdLife International (2019) Species factsheet: Edolisoma insperatum. Downloaded from http://www.birdlife.org on 21/03/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 21/03/2019.