Nisaetus floris

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	AVES	FALCONIFORMES	ACCIPITRIDAE

Scientific Name:

Nisaetus floris

Species Authority:

(E. Hartert, 1898)

Common Name/s:

English

–

Flores Hawk-eagle, Flores Hawk-Eagle

Taxonomic Notes:

Spizaetus cirrhatus (Sibley and Monroe 1990, 1993) has been split into S. cirrhatus and S. floris following Gjershaug et al. (2004). Spizaetus nanus, S. lanceolatus, S. philippensis, S. pinskeri, S. nipalensis, S. alboniger and S. bartelsi (Sibley and Monroe 1990, 1993) and S. cirrhatus and S. floris (Gjershaug et al. 2004) have been transferred into the genus Nisaetus following Haring et al. (2006). S. africanus and Hieraaetus fasciatus (Sibley and Monroe 1990, 1993) have both been transferred into Aquila, also following Haring et al. (2006); and H. kienerii (Sibley and Monroe 1990, 1993) has been transferred into the resurrected genus Lophotriorchis. The BirdLife Taxonomic Working Group is aware that phylogenetic analyses have been published which have proposed moving H. pennatus into Aquila but as not all published studies are concordant we prefer not to take a decision on this until cladogenesis of the 'booted eagles' has been resolved.

Assessment Information [top]

Red List Category & Criteria:

Critically Endangered C2a(ii) ver 3.1

Year Published:

2012

Assessor/s:

BirdLife International

Reviewer/s:

Butchart, S. & Symes, A.

Contributor/s:

Butchart, S., Collaerts, P., Dutson, G., Eaton, J., Gjershaug, J., Prawiradilaga, D. & Verbelen, F.

Justification:
This species has an extremely small population that is undergoing a continuing and very rapid decline as a result of habitat clearance, and as a consequence it is listed as Critically Endangered.

History:

2009	–	Critically Endangered
2008	–	Endangered
2005	–	Endangered
2004	–	Not Recognized
2000	–	Not Recognized
1994	–	Not Recognized
1988	–	Not Recognized

Geographic Range [top]

Range Description:	Spizaetus floris is found in Indonesia, on the islands of Flores, Sumbawa and Lombok (on the borders of Rinjani National Park) as well as on two satellite islands, Satonda near Sumbawa and Rinca near Komodo (Gjershaug et al. 2004). It has recently been reported from Alor (P. Collaerts in litt. 2011, F. Verbelen in litt. 2012) and is apparently present throughout the island (F. Verbelen in litt. 2012). Records from Paloe (Verheijen 1961) and Komodo (Coates and Bishop 1997) have not been verified. Its population size has been estimated at fewer than 100 pairs, based on the extent of suitable habitat and a territory size estimate of c.40 km² (Gjershaug et al. 2004). The lack of records obtained during fieldwork within its range suggest it occurs at low densities, supporting this population estimate. Population trends are not known, but it is assumed to be declining owing to on-going forest loss in the Lesser Sundas.
Countries:	Native: Indonesia
Range Map:	Click here to open the map viewer and explore range.

Population [top]

Population:	On the basis of distances between three neighbouring territories, the species's territory size was estimated at c.40km2. Given that it is primarily dependent on forest, this implies that the total population size for the species is probably less than 100 pairs or 200 mature individuals. It is estimated at 100-200 mature individuals, rouhgly equivalent to 150-300 individuals in total.
Population Trend:	Decreasing

Habitat and Ecology [top]

Habitat and Ecology:	It is found in lowland and submontane forest up to 1,600 m, with the majority of observations being made in lowland rainforest. It has been sighted over cultivated areas, but always close to intact or semi-intact forest; these records may relate to dispersing, immature or floater individuals rather than breeding adults. These records of birds outside core habitat suggest that the species may be able to disperse across the relatively narrow straits between islands so mixing between island sub-populations is inferred. Evidence suggests that breeding takes place during the dry season. Display flight and copulation have been observed on Flores in June-July. A territory size of 40 km²per pair has been estimated (Gjershaug et al. 2004).
Systems:	Terrestrial

Habitat and Ecology:

It is found in lowland and submontane forest up to 1,600 m, with the majority of observations being made in lowland rainforest. It has been sighted over cultivated areas, but always close to intact or semi-intact forest; these records may relate to dispersing, immature or floater individuals rather than breeding adults. These records of birds outside core habitat suggest that the species may be able to disperse across the relatively narrow straits between islands so mixing between island sub-populations is inferred. Evidence suggests that breeding takes place during the dry season. Display flight and copulation have been observed on Flores in June-July. A territory size of 40 km²per pair has been estimated (Gjershaug et al. 2004).

Systems:

Terrestrial

Threats [top]

Major Threat(s):	Habitat degradation and destruction are the most important threats to S. floris; records are infrequent and it has rarely been recorded during trips to several large forest tracts suggesting extreme low density and casting some doubt on the assertion that it may be able to survive in a partly cultivated landscape. Protected areas in its range are currently too small to ensure its long-term survival. Persecution, due to its habit of stealing chickens, and capture for the cagebird trade pose additional threats.

Major Threat(s):

Habitat degradation and destruction are the most important threats to S. floris; records are infrequent and it has rarely been recorded during trips to several large forest tracts suggesting extreme low density and casting some doubt on the assertion that it may be able to survive in a partly cultivated landscape. Protected areas in its range are currently too small to ensure its long-term survival. Persecution, due to its habit of stealing chickens, and capture for the cagebird trade pose additional threats.

Conservation Actions [top]

Conservation Actions:	Conservation Actions Underway It has been recorded from Rinjani National Park on Lombok. Work is underway to inform local people of the importance of this species. Conservation Actions Proposed Ensure the survival of the species by securing further protected areas within its range. Reduce persecution and exploitation levels through local education programmes. Conduct further research on the species's population size, trends and range. Verify records from additional islands. Study movements and determine population structure.

Conservation Actions:

Conservation Actions Underway
It has been recorded from Rinjani National Park on Lombok. Work is underway to inform local people of the importance of this species.

Conservation Actions Proposed
Ensure the survival of the species by securing further protected areas within its range. Reduce persecution and exploitation levels through local education programmes. Conduct further research on the species's population size, trends and range. Verify records from additional islands. Study movements and determine population structure.

Citation:	BirdLife International 2012. Nisaetus floris. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 19 June 2013.
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