Ephemera vulgata
In 3 days ~10% in a week ~30%
Ephemera vulgata is a species of mayfly in the genus Ephemera. This mayfly breeds in stationary water in slow rivers and in ponds, the nymphs developing in the mud. Ephemera vulgata can be told in both adult and subimago stages from the rather similar green drake (Ephemera danica) by its duller colour and slightly smaller size. The wings are more heavily veined and the upper side of the abdomen has pairs of dark lateral markings on each segment.
Ephemera vulgata is found throughout most of Europe. It mostly breeds in sluggish rivers and still waters such as ponds. This species is in decline, probably because of pollution of waterways by pesticides and heavy metals, and because the adult insects are disorientated by light pollution.
The nymphs of E. vulgata burrow into the sediment at the bottom of ponds. Most burrowing mayfly nymphs use the gills on their abdomens to create a current of water through their burrows, thereby ensuring sufficient oxygen is available to absorb through the tracheae in their skin. The motile, filamentous gills of E. vulgata seem to act as secondary respiratory surfaces and their presence is necessary... Wikipedia →
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More parks will be added in future updates.
No species of the same family or order lives in Stockholm, so these are its closest relatives here: other insects.
With luck
About 10% of wildlife watchers report a Drake Mackerel sighting in Stockholm on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 123rd most-seen of the 202 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 June
In those months about 10% of wildlife watchers report a Drake Mackerel in Stockholm on a given day, against under 5% in July to April, the lowest months.
Yes
Of the 6 cities where we can rate Drake Mackerel sightings, Stockholm has the highest daily chance: about 10%. Next come London (United Kingdom, under 5%) and Munich (Germany, under 5%).
GBIF citizen-science records
It is estimated from how often the Drake Mackerel is recorded against all the insects logged in Stockholm (7 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.
