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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Status of Lestes macrostigma in Bulgaria (2025)
Auteurs :	Philippe Lambret, Auteur ; Stanimira Deleva, Auteur ; Spas Uzunov, Auteur ; Dimitar Popov, Auteur
Type de document :	Article
Dans :	Odonatologica (54(1/2) 2025)
Article en page(s) :	53-84
Langues:	Anglais
Mots-clés :	TdV ; Lestes macrostigma ; Bulgarie ; Zone humide ; Dynamique population ; Conservation nature
Résumé :	Measuring population trends of freshwater insects helps to assess their conservation status and to design management protocols for wetlands. Lestes macrostigma is restricted to temporary brackish waters, a limited and fragmented habitat. Throughout its range this species is threatened at different levels, and, in Bulgaria, it has been assessed as “Critically Endangered”. In the past, along the Black Sea coast, it was known to be abundant and reproducing at two sites: Shablenska Tuzla Lake and Poda Protected Area. At a third site, Pomorie Lake, only a few individuals were recorded without clear evidence of reproduction. We aimed at updating its distribution along the Bulgarian Black Sea coast and determining the conservation status of its populations by conducting surveys from 2021 to 2024 at 53 localities, mainly within coastal lagoons and estuaries. We recorded all Odonata species along with their various life stages and reproductive behaviour. Other resident species recorded in association with L. macrostigma were Lestes barbarus, L. dryas, Ischnura elegans, Aeshna affinis, Sympetrum fonscolombii, S. meridionale, and S. striolatum. We counted L. macrostigma adults along walks and extrapolated abundance over the entire sites and season. Lestes macrostigma population size reached hundreds of thousands of adults at Shablenska tuzla and Pomorie Lake. At Nanevska tuzla and Atanasovsko Lake, two new sites for the species, thousands of adults were present. However, we found that L. macrostigma had disappeared from at least a part of Poda Protected Area, most likely because of a change in water management practices. As the timing of the flooding period is a key feature of the species’ habitat, we found that its presence in the temperate Bulgarian estuaries was unlikely. As conservation management plans are still lacking for Shablenska tuzla and Pomorie Lake, the future of the two largest L. macrostigma populations of Bulgaria of international importance seems tenuous and uncertain. Therefore, key actions for the conservation of L. macrostigma are the proper management of its existing reproductive sites and restoring or recreating temporary wetlands.

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