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- Sahlén, Göran, 1964-, et al.
(författare)
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Critical species of Odonata in Europe
- 2004
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Ingår i: International Journal of Odonatology. - Abingdon : Taylor & Francis. - 1388-7890 .- 2159-6719. ; 7:2, s. 385-398
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Tidskriftsartikel (refereegranskat)abstract
- The status of the odonate fauna of Europe is fairly well known, but the current IUCN Red List presents only six species out of ca 130, two of which are actually out of danger today. In this paper we propose a tentative list of 22 possibly declining or threatened species in the region. For the majority, reliable data of population size and possible decline is still lacking. Also 17 endemic species are listed, most occurring in the two centres of endemism in the area: the south-eastern (mountains and islands) and the western Mediterranean. These species should receive extra attention in future updates of the world Red List due to their limited distribution. The extreme variation in biomes and the human exploitation of habitats make conservation planning complicated in Europe. Within the EU, the FFH directive is a working tool aiding conservation. However, the species included do not fully correspond to those on the current Red List, nor to those discussed in this paper. We believe that future conservation efforts should focus on the most valuable and threatened habitats in each sub-region. Active conservation measures could be implemented on a European scale, provided that research will establish a solid ground for such measures. © 2004 Taylor & Francis Group, LLC.
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| 2. |
- Termaat, Tim, et al.
(författare)
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Spearhead blues : How threats to the damselfly Coenagrion hastulatum changed over time
- 2024
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Ingår i: Journal of Insect Conservation. - : Springer. - 1366-638X .- 1572-9753. ; 28, s. 211-224
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Tidskriftsartikel (refereegranskat)abstract
- Abstract: Given the rapid response of insects to environmental changes, their most prominent threats may change quickly as well. For effective insect species conservation it is therefore necessary to discriminate between former and current drivers of decline and to focus conservation efforts on the latter. We investigated how various environmental pressures, including former drivers of decline, have affected populations of the regionally endangered damselfly Coenagrion hastulatum and how their relevance has evolved over time. In our analysis, we compared water quality, vegetation properties and population trends across three distinct time spans: 1921–2000, 2001–2015 and 2016–2021. We included all known reproduction sites in the Netherlands, both current and historical, and also considered adjacent sites that were never inhabited. Ponds suitable for the species were characterised by mesotrophic conditions and high coverage of emergent and floating vegetation. Never inhabited ponds differed from inhabited ponds in being either more acidic or more eutrophic. Ponds where C. hastulatum disappeared between 2001 and 2015 had less of the mentioned vegetation structures and higher concentrations of various minerals. Ponds where the species disappeared after 2015 experienced severe droughts during 2018–2020. Most primary threats to C. hastulatum have shifted over time. In the past, changes in human use of ponds and increased sulphur and nitrogen deposition posed prominent threats. Presently, severe droughts, alongside nitrogen deposition have become the dominant concerns. Consequently, restoration of groundwater systems and rewetting measures are now first conservation priorities. Implications for insect conservation: Our study highlights how threats to insect populations can rapidly evolve. Consequently, conservation strategies need regular evaluation and adjustment.
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