Pemphigus spyrothecae
In 3 days ~10% in a week ~30%
Pemphigus spyrothecae, or the poplar spiral gall aphid, is a social insect which exhibits apparent altruistic behaviors. The aphids form galls and act as colony defenders, at times sacrificing their own lives to do so. It has been shown that colony defense is more likely in habitats that are difficult to obtain and can hold a large number of individuals. These gall locations are crucial because plants have a short window in which a gall can be produced. Thus, it is important for there to be a defense system that enables the aphids to retain their galls. The need for defense arises when the gall is opened up to allow winged aphid migrants to leave and to release any waste. The process of repairing the holes can take up to 10 days; during this time, the gall is susceptible to intruding predators.
P. spyrothecae is green, red or yellow in color and smooth to the touch. The outer surface of this species develops as the edges of the petiole of Populus nigra thicken, flatten and twist. In parallel to the petiole's shape, a gall forms into a spiral shape similar to that of the inside of a snail's shell. The fundatrix, or parthenogenetic female aphid produced on the primary... Wikipedia →
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Poplar Spiral Gall Aphid sighting in Berlin on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 322nd most-seen of the 1065 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.
July to November
In those months about 10% of wildlife watchers report a Poplar Spiral Gall Aphid in Berlin on a given day, against under 5% in December to June, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Poplar Spiral Gall Aphid sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 11 cities where we can rate Poplar Spiral Gall Aphid sightings, Berlin ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Kharkiv (Ukraine, about 10%) and Liverpool (United Kingdom, about 10%).
GBIF citizen-science records
It is estimated from how often the Poplar Spiral Gall Aphid is recorded against all the insects logged in Berlin (26 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.
