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Subject Item

n2:376893

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schema:CreativeWork bibo:Document

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Lohr (2021)

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schema:datePublished

2021-01-01

dct:title

Lohr (2021)

foaf:page

n4:351195929_Selysiothemis_nigra_new_for_continental_France_Odonata_Libellulidae

dct:abstract

On 24-vii-2020 one adult male and two exuviae of Selysiothemis nigra were found in the middle Durance Valley, southern France, in the North of the Var department, not far from the village of Vinon-sur-Verdon. These observations are the first records of the species in continental France. The exuviae were found on the shore of a former gravel pit, while the imago was photographed perching on a stem at a river bank near the Durance. The findings are discussed regarding the hitherto known range of the species, and possible immigration routes are described. The nearest sites where the species occurs are situated in northwestern Italy, northeastern Corsica and northeastern Spain, between 250 and 330 km from the Durance Valley. Most probably there is a migration of S. nigra along the shore of the Mediterranean Sea, either from the Southwest (Spain) or the Southeast (Corsica and Italy), before entering continental France and following the Durance Valley. The causes of an increase of records of S. nigra in an almost constant range, as well as the obvious spreading of other species like Trithemis annulata and T kirbyi, are discussed. Climate change has clearly favoured the expansion of at least T annulata and T kirbyi during the last decades and years, respectively, and these species entered continental France coming from Spain. However, the increase of anthropogenic water bodies like man-made dams, irrigation basins, impoundments or gravel pits have also favoured this trend as recently stated for the highly ubiquitous T kirbyi, for which both climate and habitat changes act in synergy. In the case of S. nigra, the increasing availability of such artificial, suitable habitats might be the main reason for the expansion as the species has been demonstrated to have recently established in areas where temperatures have decreased and rainfall increased since the turn of the millenium. Whether climatic factors also have a significant influence on the increase of observations and the small range expansions of this species might be made clearer by future research.

bibo:abstract

On 24-vii-2020 one adult male and two exuviae of Selysiothemis nigra were found in the middle Durance Valley, southern France, in the North of the Var department, not far from the village of Vinon-sur-Verdon. These observations are the first records of the species in continental France. The exuviae were found on the shore of a former gravel pit, while the imago was photographed perching on a stem at a river bank near the Durance. The findings are discussed regarding the hitherto known range of the species, and possible immigration routes are described. The nearest sites where the species occurs are situated in northwestern Italy, northeastern Corsica and northeastern Spain, between 250 and 330 km from the Durance Valley. Most probably there is a migration of S. nigra along the shore of the Mediterranean Sea, either from the Southwest (Spain) or the Southeast (Corsica and Italy), before entering continental France and following the Durance Valley. The causes of an increase of records of S. nigra in an almost constant range, as well as the obvious spreading of other species like Trithemis annulata and T kirbyi, are discussed. Climate change has clearly favoured the expansion of at least T annulata and T kirbyi during the last decades and years, respectively, and these species entered continental France coming from Spain. However, the increase of anthropogenic water bodies like man-made dams, irrigation basins, impoundments or gravel pits have also favoured this trend as recently stated for the highly ubiquitous T kirbyi, for which both climate and habitat changes act in synergy. In the case of S. nigra, the increasing availability of such artificial, suitable habitats might be the main reason for the expansion as the species has been demonstrated to have recently established in areas where temperatures have decreased and rainfall increased since the turn of the millenium. Whether climatic factors also have a significant influence on the increase of observations and the small range expansions of this species might be made clearer by future research.

dct:issued

2021-01-01

dct:bibliographicCitation

Lohr, M. 2021 <em>Selysiothemis nigra </em>new for continental France (Odonata: Libellulidae).&nbsp;Libellula Supplement 16: 177–188

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n4:351195929_Selysiothemis_nigra_new_for_continental_France_Odonata_Libellulidae