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Location Japan, Iwate
Central coordinates 141o 59.00' East  39o 40.00' North
IBA criteria A4ii
Area 8 ha
Altitude 0 - 50m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description The site is an uninhabited islet about 1 km off shore of Hinodejima fishery harbor in Miyako City, Iwate Prefecture. The shape of the islet is a tableland surrounded by cliffs, and its steep slopes are breeding sites for burrow nesting sea birds. The islet is widely covered with broadleaf trees such as Quercus crispula and Tilia japonica, and Pinus densiflora and Cyryptomeria japonica also occur in some areas. Forest floors in the center of the islet were covered with Pseudosasa japonica while the east slope in the northern area was covered with Reynoutria sachalinensis and from the west slope to southern area with Ophiopogen planiscdapus, but bare ground has become distinctive lately. Since the late of 1980s, the vegetation has been changing rapidly as the number of Streaked Shearwater is increasing.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Hydrobates castro breeding  2004  present  A4ii  Not Recognised 

IBA Monitoring

2010 low not assessed low
Poor - based on little, or potentially unreliable/unrepresentative, data

Invasive & other problematic species, genes & diseases problematic native species/diseases - unspecified species happening now majority/most of area/population (50-90%) no or imperceptible deterioration low

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Unknown  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Hinodejima National Wildlife Special Protected Area 6 is identical to site 8  
Rikuchu - Kaigan National Park 12,212 protected area contains site 8  


IUCN habitat Habitat detail Extent (% of site)
Coastline Sea cliffs and rocky shores  -
Forest   -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Hideshima islet. Downloaded from on 27/10/2016

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