IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackAphrosylus calcarator Frey, 1945

Aphrosylus calcarator Frey, 1945

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Insecta
  • Order: Diptera
  • Family: Dolichopodidae
LC Least Concern
IUCN Red List Status:

Countries of Occurrence:
Portugal - Azores

Archipelago(s):
Azores

Reviewer/s:
Danielczak, A.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

Aphrosylus calcarator is an endemic species of the Azores (Portugal), being present (at least historically) on all the islands of the Azorean archipelago with the exception of Santa Maria. This species was considered common and widespread through the coastal areas of the archipelago (Frey 1945). From the historical data, this species potentially has a relatively large Extent of Occurrence (27,415 km2) but a small Area of Occupancy (244 km2), although these are most likely underestimates. It is possible that this species has declined in the past as a result of human activity, but the present situation of this species needs to be further assessed, and further research is needed into its population, distribution, threats, ecology and life history; while conservation of coastal areas could potentially aid this species' conservation. Even though there is a paucity of recent data regarding this species' population, distribution, threats and ecology, this species is unlikely to warrant listing as threatened under any criterion, and so it is listed as Least Concern.

Geographic Range:

Aphrosylus calcarator is an endemic species that was described from the coastal areas of all the islands of the Azores (Portugal) with the exception of Santa Maria (Borges et al. 2010). Based on the old historical data (Frey 1945), the Extent of Occurrence (EOO) could be ca. 27,415 km² and the Area of Occupancy (AOO) could be ca. 244 km². However, there is no recent information regarding the distribution of this species. 

Regions:
Portugal - Azores
Extent of Occurrence (EOO):
27,415 (km2)
Area of Occupancy (AOO):
244 (km2)
Elevation Lower Limit:
(m)
Elevation Upper Limit:
(m)
Biogeographic Realms:
Palearctic
Presence:
Extant
Origin:
Endemic Azores
Seasonality:
Resident

Population:

No current population size estimates exist. Nevertheless, from the species description (Frey 1945) and from the samples collected in 1938, this species was considered common and widespread through the coastal areas of the Azores archipelago. Current Population Trend: Unknown.

Habitat and Ecology

The ecology and traits of this species are unknown. Adults and most larvae of other species of Dolichopodidae are predators, feeding on other arthropods, with the adults of some species being notable predators of Culicidae (McAlpine et al. 1987). The larvae occupy a wide range of habitats, living generally in moist environments such as soil, moist sand, or rotting organic matter. Many flies of the subfamily Hydrophorinae live in the intertidal zone of seashores and accordingly, Aphrosylus calcarator was collected on the seashore and intertidal areas of several Azorean islands, being considered very common and widespread (Frey 1945). Systems: Terrestrial.

Major Threat(s):

A lack of information regarding the present status of this species precludes an assessment of potential threats. Nevertheless, the apparent habitat preferences of this species suggests that it might be affected by future habitat declines as a consequence of climate change (Ferreira et al. 2016) and human disturbance of the seashore. Past human disturbance of the seashore might have also affected this species.

Conservation Actions

The species is not protected by regional law. The present situation of this species needs to be further assessed, and further research is needed into its population, distribution, threats, ecology and life history. From what is known of its habitat preferences, conservation of natural seashore areas could potentially aid this species' conservation. Historically at least, this species was present in areas that are currently included in the Natural Park of Faial.