UKmarbledWhite {AHMbook}

Data for UK Marbled White butterflies

Description

Data from the UK Butterfly Monitoring Scheme (UKBMS) for the Marbled White butterfly (Melanargia galathea), a fairly widespread species that flies in a single generation per year in the UK.

Most survey sites are chosen opportunistically and represent fixed transects of variable and often unknown length, which are walked between two and 26 times per year starting in early April. Butterflies are counted within an imaginary 5m x 5m 'moving box' along the transects (i.e., according to a Pollard walk protocol).

We restrict the data to sites where the marbled white was ever recorded, the years 1991–2015 and those 80 sites where counts took place in at least 20 of these 25 years.

Usage

data("UKmarbledWhite")

Format

A data frame with 9651 rows and the following columns:

C

count, the number of butterflies recorded

site

identification number for site

year

the year of the record

north

approximate northing of the site in the British National Grid, in meters

date

Julian date of the survey, 1 = 1st January

Source

UK Butterfly Monitoring Scheme (UKBMS) data © copyright and database right Butterfly Conservation, the Centre for Ecology and Hydrology, British Trust for Ornithology, and the Joint Nature Conservation Committee, 2018. The UKBMS is indebted to all volunteers who contribute data to the scheme.

https://www.ceh.ac.uk/our-science/projects/uk-butterfly-monitoring-scheme

References

Kéry, M. & Royle, J.A. (2021) Applied Hierarchical Modeling in Ecology AHM2 - 1.8.2.

See Also

SwissMarbledWhite.

Examples

data(UKmarbledWhite)
str(UKmarbledWhite)