Baltic coastal meadow specialist plant abundances and habitat extent variables in the 1960s and 2024

This data consists of an inventory and a re-inventory of plant specialist abundances in Baltic coastal meadows, together with explanatory variables used to model species occurrence and abundance changes between the time steps. The original data was collected by Germund Tyler and published in Tyler (1969) as maps. This original data was collected from 76 Baltic coastal meadows, but here we only include the 65 for which we have data from the re-inventory of 2024. Four of the eleven meadows excluded from this dataset were situated on inaccessible islands, two have been converted to parking lots and five could not be located for the re-inventory. Habitat size, habitat amount, number of coastal meadows and management were calculated using a time series of aerial images. The management status was determined for all sites in each time step in the aerial image time series; all managed coastal meadows were digitized for the aerial images from the 1960s and 2023. See the belonging paper for more information on the plant inventories and the aerial image interpretation. Reference to the original dataset: Tyler, G. (1969). Studies in the ecology of Baltic sea-shore meadows. 2. Flora and vegetation. Opera Botanica a Societate Botanica Lundensi, 25.