Hampshire and Isle of Wight Butterfly and Moth Society
Hampshire and Isle of Wight Butterfly and Moth Society
| Family: | Nymphalidae |
| Subfamily: | Satyrinae |
| Genus: | Coenonympha |
| Species: | pamphilus |
| Authority: | (Linnaeus, 1758) |
Despite its name, the Small Heath is not confined to heathland and can be found in a wide variety of habitats. The main distinguishing feature of this species is that this is the smallest of our 'browns' and is closer in size to a skipper, Common Blue or Brown Argus than its relatives, such as the Meadow Brown. However, its fluttering flight is quite different from that of the skippers and blues and is relatively-easy to identify in the field. This charming little butterfly always settles with its wings closed, where the eye spot on the underside of the forewing is usually visible, acting as a decoy to any predator. The forewings are tucked behind the hindwings when roosting for long periods, or in dull weather, the butterfly looking quite inconspicuous as the browns and greys of the underside of the hindwing blend in with their surroundings.
This is a widespread butterfly and can be found over most of the British Isles, with the exception of Orkney and Shetland and mountainous regions. It lives in discrete colonies and adults rarely venture far from the colony. However, the odd adult will venture further afield and will colonise nearby habitat if it is suitable.
| #Individuals | #Tetrads | 2022 | 2023 | Abundance Trend | 2022 | 2023 | Distribution Trend |
|---|---|---|---|---|---|
| 8284 | 11196 | +35% | 269 | 301 | +11% |
| #Records | #Individuals | Earliest Record | Latest Record | |
|---|---|---|---|---|
| All Records | 63,348 | 255,314 | 08/04/1997 | 29/10/2011 |
| 2023 | 3,231 | 11,196 | 7/5/2023 | 3/10/2023 |
| Location | Date | Quantity | |
|---|---|---|---|
| Earliest Record | Broughton Down 2 transect: Section 8 | 7/5/2023 | 1 |
| Latest Record | Bury Hill transect: Section 5 | 3/10/2023 | 1 |
| Highest Count | Stockbridge Down | 22/8/2023 | 173 |
One of the issues with 'raw' trend data is that there is inherent bias based on the number of recorders. For example, the number of individuals and populated tetrads recorded are likely to increase if there is an increase in the number of recorders. In order to remove this bias, the normalised trends use data that has been recalculated using the average number of recorders over the trend period. This normalisation gives a much better picture of the true trends.
Average #Recorders: 177.56
Average #Recorders: 177.56