Butterfly Sampling: Pollard Walk 2025

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The minimum criteria are either 13-17C with at least 60% sunshine, or if there is no sunshine the temperature must be 17C or above. Windspeed (Beaufort scale) should be no more than 5 unless the transect route is sheltered from the wind.
- Transect Counts - Pollard Walks. A transect is a fixed route (walk) established at a site where butterflies are recorded, ideally weekly, over a number of years following some basic rules.
Butterfly species composition and relative abundances are sampled using transect counts, modified from Pollard (1977). Transect routes are established as appropriate for each site, typically including distinct segments near the base of a sloped habitat, mid-slope, and along ridgetops.
The Butterfly Transect is a walk along a set route that is divided into separate sections. In each of these sections the number of butterflies are counted along with the climatic conditions. Using this method comparisons can be made year-on-year and between transects.
Timing of visits Warm sunny weather between mid-morning and mid-afternoon is ideal, although some species may fly earlier and later in hot conditions; in cool overcast conditions you are unlikely to see butterflies in flight, but they may be found resting.
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Linear transect (a): 20 photo-quadrats are taken at a given isobath, located by permanent marks. Random patch transect (b): 3 groups of 9 photo-quadrats are taken, following the indicated numbers scheme from 1 to 9, several times at a same depth.

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