Die Libellenfauna des Tongrubengebiets bei Gozdnica (SW Polen) mit besonderer Berücksichtigung von Leucorrhinia caudalis (Charpentier, 1840)

Gewässer anthropogenen Ursprungs haben potenziell einen hohen Wert als Lebensraum für die Libellenfauna. Im Jahr 2017 wurden alte Restgewässer im Gebiet einer Tongrube bei Gozdnica (Woiwodschaft Lubuskie, SW Polen) auf Libellen untersucht. Dabei stand im Vordergrund die Überprüfung der Gewässer hinsichtlich des potenziellen Vorkommens von Leucorrhinia caudalis (Charpentier, 1840). Weiterhin sollte untersucht werden, ob sie einen Beitrag für die regionale Libellenvielfalt leisten. Die durchgeführte Kartierung erbrachte zwei neue Fundorte von L. caudalis mit Nachweis eines bodenständigen Vorkommens an einem Gewässer und Beobachtung von geschlechtsreifen Imagines an beiden Fundorten. Bemerkenswert sind darüber hinaus bodenständige Nachweise von zwei weiteren nach nationalem und europäischen Recht geschützten Arten: Leucorrhinia pectoralis (Charpentier, 1825) und Leucorrhinia albifrons (Burmeister, 1839). Außerdem ist das gesamte Gebiet für Pionierarten, wie Ischnura pumilio (Charpentier, 1825) und Libellula depressa Linnaeus, 1758 sowie thermophile Arten, wie Orthetrum coerulescens (Fabricius, 1798) und Crocothemis erythraea (Brullé, 1832) als Lebensraum besonders geeignet. Insgesamt konnten 30 Libellenarten nachgewiesen werden. Für 16 Arten wurde der Reproduktionsnachweis erbracht. Die untersuchten Restgewässer stellen einen wichtigen Lebensraum sowohl für weit verbreitete Generalisten als auch für seltene Spezialisten dar. Damit tragen sie auch signifikant zur Erhaltung der regionalen Libellenvielfalt bei. Abstract Waters of anthropogenic origin potentially represent a high value for the dragonfly fauna. For this reason, post mining waters were examined for dragonflies in a clay pit area near Gozdnica (Lubuskie Voivodeship, SW Poland) in 2017. The main goals of this study were the verification of the potential occurrence of Leucorrhinia caudalis (Charpentier, 1840) in this area as well as the contribution of these water bodies to the regional dragonfly diversity. As a result of the investigation were two new records of L. caudalis with reproduction evidence at one water body and the observations of imagines at two sites. Additionally, two further species protected according to national and European law: Leucorrhinia pectoralis (Charpentier, 1825) and Leucorrhinia albifrons (Burmeister, 1839) were found in the area. Furthermore, the entire area is particularly suitable for pioneer colonizers such as Ischnura pumilio (Charpentier, 1825) and Libellula depressa Linnaeus, 1758, as well as for thermophilous species such as Orthetrum coerulescens (Fabricius, 1798) and Crocothemis erythraea (Brullé, 1832). A total of 30 species of dragonflies were detected. For 16 species the proof of reproduction was provided. The examined water bodies are an important habitat for widespread generalists and for rare specialists. Therefore, they significantly contribute to the regional biodiversity.

Waters of anthropogenic origin potentially represent a high value for the dragonfly fauna. For this reason, post mining waters were examined for dragonflies in a clay pit area near Gozdnica (Lubuskie Voivodeship, SW Poland) in 2017. The main goals of this study were the verification of the potential occurrence of Leucorrhinia caudalis (Charpentier, 1840) in this area as well as the contribution of these water bodies to the regional dragonfly diversity. As a result of the investigation were two new records of L. caudalis with reproduction evidence at one water body and the observations of imagines at two sites. Additionally, two further species protected according to national and European law: Leucorrhinia pectoralis (Charpentier, 1825) and Leucorrhinia albifrons (Burmeister, 1839) were found in the area. Furthermore, the entire area is particularly suitable for pioneer colonizers such as Ischnura pumilio (Charpentier, 1825) and Libellula depressa Linnaeus, 1758, as well as for thermophilous species such as Orthetrum coerulescens (Fabricius, 1798) and Crocothemis erythraea (Brullé, 1832). A total of 30 species of dragonflies were detected. For 16 species the proof of reproduction was provided. The examined water bodies are an important habitat for widespread generalists and for rare specialists. Therefore, they significantly contribute to the regional biodiversity.