1. Environmental drivers of the decline of the fen orchid Liparis loeselii.
- Author
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Andersen, Dagmar Kappel, Ejrnæs, Rasmus, Minter, Martine, Riis, Tenna, Vinther, Erik, and Bruun, Hans Henrik Kehlet
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HABITAT destruction , *AGRICULTURAL intensification , *HYDROLOGIC models , *PLANT species , *FENS - Abstract
Liparis loeselii is a rare and declining orchid species restricted to rich fens in the Northern Hemisphere. Habitat destruction, eutrophication, drainage and scrub encroachment have been suggested as reasons for the decline. However, which factors are most important is not well understood. Based on vegetation and environmental properties from extant, potential and historicalL. loeselii sites, we 1) developed habitat suitability models from either Ellenberg Indicator Values, which were derived from known habitat preferences of co‐occurring plant species, or field‐measured environmental properties, and 2) identified the primary reasons for the observed decline ofL. loeselii . We found nutrient status to be the most important predictor forL. loeselii occurrence, followed by hydrology proxies (Ellenberg reaction and Ellenberg moisture). Vegetation height and Ellenberg light were of minor importance. Effect partitioning based on sites, from whichL. loeselii has gone locally extinct, pinpointed eutrophication and drainage to be the most likely primary drivers of the species' demise. Phosphorus limitation induced by discharge of calcium‐rich groundwater seems to be crucial forL. loeselii to sustain populations in landscapes dominated by intensive agriculture. [ABSTRACT FROM AUTHOR]- Published
- 2024
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