Dasysyrphus albostriatus
In 3 days ~10% in a week ~30%
Dasysyrphus albostriatus is a Palearctic species of hoverfly. External images For terms see Morphology of Diptera Wing length 6·25–9·5 mm. Thorax dorsum with two median stripes of white dust. The thorax is otherwise shining black. Tergites with linear yellow spots which sometimes connect on tergites 3 and 4.
The larva is figured by Dusek and Laska (1962). Palaearctic. Fennoscandia South to Iberia and north Africa. Ireland eastwards through Central and Southern Europe (Italy, Yugoslavia) to Greece, Turkey and European parts of Russia (South to Crimea and the Caucasus). East into Central Asia and Japan.
Habitat coniferous and deciduous woodland and conifer plantation, up to the alpine zone, tracksides, clearings, parks, gardens. Flowers visited include yellow composites, white umbellifers, Acer pseudoplatanus, Calluna, Crataegus, Euphorbia, Lonicera xylosteum, Papaver, Ranunculus, Rubus, Salix, Sorbus, Stellaria, Succisa pratensis, and Viburnum opulus.
The flight period is from the end of April (early April in southern Europe) to September. The larva is predominantly aphid-feeding, but also predatory on a wide range of soft-bodied... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 2 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Birmingham | 🇬🇧 United Kingdom | |
| 2 | Liverpool | 🇬🇧 United Kingdom | |
| 3 | London | 🇬🇧 United Kingdom | |
| 4 | Brussels | 🇧🇪 Belgium | |
| 5 | Warsaw | 🇵🇱 Poland | |
| 6 | Manchester | 🇬🇧 United Kingdom | |
| 7 | Leeds | 🇬🇧 United Kingdom | |
| 8 | Stockholm | 🇸🇪 Sweden | |
| 9 | Paris | 🇫🇷 France | |
| 10 | Berlin | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Stripe-Backed Brusheye sighting in Copenhagen on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 260th most-seen of the 476 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
May and August
In those months about 10% of wildlife watchers report a Stripe-Backed Brusheye in Copenhagen on a given day, against under 5% in June–July and September–April, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Stripe-Backed Brusheye sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
12th of 17
Of the 17 cities where we can rate Stripe-Backed Brusheye sightings, Copenhagen ranks 12th at under 5%. The best odds are in Birmingham (United Kingdom, about 10%), Liverpool (United Kingdom, about 10%) and London (United Kingdom, about 10%).
GBIF citizen-science records
It is estimated from how often the Stripe-Backed Brusheye is recorded against all the insects logged in Copenhagen (11 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
