Hampshire and Isle of Wight Butterfly and Moth Society
Hampshire and Isle of Wight Butterfly and Moth Society
| Family: | Nymphalidae |
| Subfamily: | Satyrinae |
| Genus: | Melanargia |
| Species: | galathea |
| Authority: | (Linnaeus, 1758) |
Despite its name, the Marbled White is more closely related to the subfamily known as the "browns" that the "whites". This butterfly is unmistakable, its black and white markings distinguishing it from all other species found in the British Isles. This butterfly is found in distinct and often large colonies, south of a line between Glamorganshire in the west and North-east Yorkshire in the east, although it is not found in much of eastern England. It is absent from Scotland, Ireland and the Isle of Man.
| #Individuals | #Tetrads | 2022 | 2023 | Abundance Trend | 2022 | 2023 | Distribution Trend |
|---|---|---|---|---|---|
| 17402 | 21842 | +25% | 412 | 510 | +23% |
| #Records | #Individuals | Earliest Record | Latest Record | |
|---|---|---|---|---|
| All Records | 61,107 | 432,160 | 22/05/2022 | 25/09/2003 |
| 2023 | 3,497 | 21,842 | 30/5/2023 | 21/8/2023 |
| Location | Date | Quantity | |
|---|---|---|---|
| Earliest Record | Yateley Common West transect: Section 2 | 30/5/2023 | 1 |
| Latest Record | Noar Hill transect: Section 1 | 21/8/2023 | 1 |
| Highest Count | Stockbridge Down | 6/7/2023 | 304 |
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: 336
Average #Recorders: 336