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Changes in the Abundance of Danish Orchids over the Past 30 Years

Department of Bioscience, Aarhus University, 8600 Silkeborg, Denmark
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Diversity 2020, 12(6), 244; https://doi.org/10.3390/d12060244
Received: 12 April 2020 / Revised: 8 June 2020 / Accepted: 9 June 2020 / Published: 15 June 2020
(This article belongs to the Section Plant Diversity)
Orchid abundance data collected over the past 30 years (1987–2016) from 440 sites within the National Orchid Monitoring Program were analyzed to quantify the population trends of orchids in Denmark, and the underlying reasons for the observed population trends were analyzed and discussed. Of the 45 monitored Danish orchids, 20 showed a significant decrease in abundance over the past 30 years (16, if only orchids with at least 50 observations each were selected), thus corroborating the previous observations of declining orchid abundances at the European scale. Generally, there was a significant negative effect of overgrowing with tall-growing herbs and shrubs on the abundance of Danish orchids, mainly caused by change of farming practices, as extensive management, such as grazing or mowing of light-open grassland areas, has decreased. View Full-Text
Keywords: Danish orchid species; Danish Red List; National Orchid Monitoring Program; Danish Orchid Database; citizen science; orchid monitoring; vegetation; population size; population trend; plant abundance; plant diversity; pressures on orchid sites; farming practice Danish orchid species; Danish Red List; National Orchid Monitoring Program; Danish Orchid Database; citizen science; orchid monitoring; vegetation; population size; population trend; plant abundance; plant diversity; pressures on orchid sites; farming practice
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MDPI and ACS Style

Damgaard, C.; Moeslund, J.E.; Wind, P. Changes in the Abundance of Danish Orchids over the Past 30 Years. Diversity 2020, 12, 244.

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