Proischnura polychromatica 

Scope: Global, Pan-Africa & Southern Africa
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Coenagrionidae

Scientific Name: Proischnura polychromatica (Barnard, 1937)
Common Name(s):
English Mauve Bluet
Enallagma polychromaticum Barnard, 1937
Proischnura polychromaticum (Barnard, 1937)

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv) ver 3.1
Year Published: 2018
Date Assessed: 2017-10-26
Assessor(s): Samways, M.J.
Reviewer(s): Dijkstra, K.-D.B. & Clausnitzer, V.
The species was not recorded between 1962 and 2003, despite intensive searches, even at its type locality. It has apparently been lost from the only two sites it was previously known from. In December 2003 and in January 2015 it was discovered at two new localities within the Dutoitsriveier system. Even though some localities are within the Threewaters Nature Reserve, the majority is outside the reserve and the habitats are threatened from cattle farming, forestry plantations, alien invasive vegetation and possibly canalisation of streams. One of the known localities, where the species currently occurs has had alien invasive trees removed
Its extent of occurrence is 16.4 km² within the Critically Endangered threshold, but the area of occupancy is with 24 km² larger than the extent of occurrence, and hence the category EN applies. The species appears to be genially rare and is threatened by farming and habitat destruction. It is listed as Endangered.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Previously this species was known only from the type locality (Sevenweeks Port, Western Cape, South Africa), where it was collected between 1932 and 1936; and from one female, which was taken at Franschhoek in 1962 (Pinhey 1984b). Between 1962 and 2003, the species was not rediscovered despite intensive searches throughout the Western Cape between 1993 and 2000 (see reference in reference list). A suggestion that it occurred in the Hermans area was not confirmed, and indeed streams in this area have undergone major disturbance in recent years. In November 2003, the species was rediscovered at a new site (on the Dutoitsriveier near Villiersdorp) where invasive alien trees have been removed.
Countries occurrence:
South Africa (Western Cape)
Additional data:
Estimated area of occupancy (AOO) - km2:24
Number of Locations:1
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Few individuals have been recorded (Pinhey 1984b). The only known extant population has fewer than 50 individuals (Samways et al. 2005).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Pools in braids of streams with abundance of sedges.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): This species faces multiple threats, including loss of habitat due to cattle farming and plantation forestry, overgrowth of riverbanks by alien invasive trees (Samways and Taylor 2004), groundwater abstraction and possibly canalisation of streams and predation from an alien trout species.

Conservation Actions [top]

Conservation Actions: Further searches are urgently required, but the chances of relocating it appear to be ever slimmer. The removal of alien invasive trees is very beneficial for this species and should continue. Research into habitat status, population numbers and range, and trends/monitoring of the species would be valuable. Habitat and site-based actions are also required.

Citation: Samways, M.J. 2018. Proischnura polychromatica. The IUCN Red List of Threatened Species 2018: e.T63219A90238127. . Downloaded on 22 September 2018.
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