Nesoryzomys narboroughi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Rodentia Cricetidae

Scientific Name: Nesoryzomys narboroughi Heller, 1904
Taxonomic Notes: Previously this species was considered synonymous with Nesoryzomys indefessus (see Musser and Carleton 1993). Recent evidence suggests that the two should be treated as separate species (Dowler et al. 2000). More research is needed to confirm that these are really two different species (M. Weksler pers. comm).

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2018
Date Assessed: 2017-01-16
Assessor(s): Dowler, R. & Weksler, M.
Reviewer(s): Amori, G.
Contributor(s): Tirira, D.G. & Boada, C.
This species is assessed as Vulnerable under criterion D2 because it has a very restricted population which is potentially threatened by the possible introduction of exotic species (rats, mice, and cats) to the island. The species has an extent of occurrence (EOO) of approximately 640 km², an area of occupancy (AOO) that is likely less than 20 km², and is found in just one location (Fernandina Island). Efforts are needed to monitor this species and eradicate invasive species.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to Galápagos Islands. It occurs in Fernandina (= Narborough) Island (Dowler et al. 2000).
Countries occurrence:
Ecuador (Galápagos)
Additional data:
Upper elevation limit (metres):1300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This rat is locally common (Dowler et al. 2000).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:It is terrestrial and nocturnal. There is no information about its diet. This species co-occurs with Nesoryzomys fernandinae. It has been captured in lowland and highland areas into the Fernandina Island; at high-elevation (about 1,300 m) along the volcano rim the vegetation is primarily Scalesia spp. and was most dense (Dowler et al. 2000).

Threats [top]

Major Threat(s): The main potential threat to this species is the possible introduction of exotic species, in particular Rattus rattus and Mus musculus.

Conservation Actions [top]

Conservation Actions: Control exotic species and access to the island, and enact a program to prevent the introduction of common rats.

Citation: Dowler, R. & Weksler, M. 2018. Nesoryzomys narboroughi. The IUCN Red List of Threatened Species 2018: e.T40765A22390714. . Downloaded on 26 September 2018.
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