Environmental drivers of Liparis loeselii decline in Denmark

Vegetation and environmental properties from extant, potential, and historical occurrence sites of Liparis loeselii (Orchidaceae) in Denmark, collected in order to develop habitat suitability models from Ellenberg Indicator Values and field-measured environmental properties, and in order to identify the primary reasons for the observed decline of L. loeselii in Denmark and beyond., The data were combined from existing nature surveillance data and targeted collection of from Liparis loeselii populations using identical methods. We extracted data from all 285 sites (i.e. protected areas, variable in size, but typically several to tens of hectares) in The Danish National Monitoring Programme, NOVANA (https://novana.au.dk/) 2004-2012, which included plots (i.e. circular quadrats of 78.5 m2) classified as fen in a broad sense (i.e. rich fen, alkaline spring, floating fen, wet meadow, humid dune slack and alkaline fen with Cladium mariscus (L.) Pohl. In a first step, we pruned the data so that for repeatedly monitored plots, only the latest recording was kept, and monitoring sites with less than four survey plots were excluded. This procedure resulted in a data set of 17,436 vegetation quadrats. In a second step, individual plots of non-fen vegetation, which had been included due to the random placement of recording plots at monitoring stations, were excluded. This was ..., , # Data from: Environmental drivers of Liparis loeselii decline in Denmark

[https://doi.org/10.5061/dryad.8pk0p2nxd](https://doi.org/10.5061/dryad.8pk0p2nxd)

## Description of the data and file structure

Environmental conditions, measured directly or via bioindication, of extant, potential, and historical occurrence sites of the fen orchid, Liparis loeselii, in Denmark

### Files and variables

#### File: Liparis-data.csv

**Description:** 

##### Variables

* Plot.ID: NOVANA surveillance plot identity or - for field data - our plot designation
* Place.name: Site topynym
* Data.collection.year: Year (CE) of collection of vegetation and environmental data
* NOVANA.station.ID: NOVANA surveillance station identity
* Habitat.type.code: EU Habitats Directive habitat type code (four digits)
* Liparis.present: 1 = presence of a Liparis loeselii population, 0 = absence
* Longitude: Geographical coordinate in decimal degrees
* Latitude: Geographical coordinate in decimal degrees
* EIV.light: C...