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The dragonfly and damselfly monitoring carried out in ten [[Suisse|Swiss]] paddy fields in 2019 and 2020 revealed 42 species. Of these, 14 species developed in the fields, of which ten are bivoltine (''[[Ischnura elegans]], [[Ischnura pumilio]], [[Anax ephippiger]], [[Anax imperator]], [[Anax parthenope]], [[Crocothemis erythraea]], [[Orthetrum albistylum]], [[Orthetrum brunneum]], [[Orthetrum cancellatum]], [[Sympetrum fonscolombii]]) and four univoltine (''[[Sympecma fusca]], [[Sympetrum depressiusculum]], [[Sympetrum striolatum]], [[Sympetrum vulgatum]]''). The discovery of exuviae of ''[[Sympetrum depressiusculum]], [[Sympetrum striolatum]]'', and ''[[Sympetrum vulgatum]]'' in July 2020 documented their development and the survival of the eggs during the harvest in October and the preparation of the plots for sowing and planting in May. A mass emergence of a second generation of ''[[Anax ephippiger]]'' and ''[[Sympetrum fonscolombii]]'' was observed in 2019. Population estimates for the Brugg site amounted to thousands or even tens of thousands of individuals, confirming the attractiveness of this habitat for the development of both migratory species in Central Europe. For ''[[Anax ephippiger]]'', the year 2019 corresponds to one of the largest known influxes in [[Suisse|Switzerland]] and Europe over the last thirty years. The proven development of ''[[Sympetrum depressiusculum]]'' in the rice field of Ins suggests that rice fields have a conservatory significance for this threatened species. | The dragonfly and damselfly monitoring carried out in ten [[Suisse|Swiss]] paddy fields in 2019 and 2020 revealed 42 species. Of these, 14 species developed in the fields, of which ten are bivoltine (''[[Ischnura elegans]], [[Ischnura pumilio]], [[Anax ephippiger]], [[Anax imperator]], [[Anax parthenope]], [[Crocothemis erythraea]], [[Orthetrum albistylum]], [[Orthetrum brunneum]], [[Orthetrum cancellatum]], [[Sympetrum fonscolombii]]'') and four univoltine (''[[Sympecma fusca]], [[Sympetrum depressiusculum]], [[Sympetrum striolatum]], [[Sympetrum vulgatum]]''). The discovery of exuviae of ''[[Sympetrum depressiusculum]], [[Sympetrum striolatum]]'', and ''[[Sympetrum vulgatum]]'' in July 2020 documented their development and the survival of the eggs during the harvest in October and the preparation of the plots for sowing and planting in May. A mass emergence of a second generation of ''[[Anax ephippiger]]'' and ''[[Sympetrum fonscolombii]]'' was observed in 2019. Population estimates for the Brugg site amounted to thousands or even tens of thousands of individuals, confirming the attractiveness of this habitat for the development of both migratory species in Central Europe. For ''[[Anax ephippiger]]'', the year 2019 corresponds to one of the largest known influxes in [[Suisse|Switzerland]] and Europe over the last thirty years. The proven development of ''[[Sympetrum depressiusculum]]'' in the rice field of Ins suggests that rice fields have a conservatory significance for this threatened species. | ||
Version du 7 octobre 2023 à 04:58
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Demoiselles et Libellules du Monde entier
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 15 642 articles
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Monnerat C. & al. 2021 - The dragonfly community in paddy fields in Switzerland (Odonata). - Libellula, suppl., 16 : 201-228.
Résumé (traduction libre)
Abstract
The dragonfly and damselfly monitoring carried out in ten Swiss paddy fields in 2019 and 2020 revealed 42 species. Of these, 14 species developed in the fields, of which ten are bivoltine (Ischnura elegans, Ischnura pumilio, Anax ephippiger, Anax imperator, Anax parthenope, Crocothemis erythraea, Orthetrum albistylum, Orthetrum brunneum, Orthetrum cancellatum, Sympetrum fonscolombii) and four univoltine (Sympecma fusca, Sympetrum depressiusculum, Sympetrum striolatum, Sympetrum vulgatum). The discovery of exuviae of Sympetrum depressiusculum, Sympetrum striolatum, and Sympetrum vulgatum in July 2020 documented their development and the survival of the eggs during the harvest in October and the preparation of the plots for sowing and planting in May. A mass emergence of a second generation of Anax ephippiger and Sympetrum fonscolombii was observed in 2019. Population estimates for the Brugg site amounted to thousands or even tens of thousands of individuals, confirming the attractiveness of this habitat for the development of both migratory species in Central Europe. For Anax ephippiger, the year 2019 corresponds to one of the largest known influxes in Switzerland and Europe over the last thirty years. The proven development of Sympetrum depressiusculum in the rice field of Ins suggests that rice fields have a conservatory significance for this threatened species.
