Thu, 30 Jun 2016 in Fragmenta Entomologica
New Records of Coenagrion Ornatum in Italy (Odonata: Coenagrionidae)
DOI: 10.4081/fe.2016.167
Abstract
Coenagrion ornatum (Sélys, 1850) is a damselfly ranging from northwestern Europe to southwestern Asia. It is highly local, and northwestern populations are experiencing a steep decline. In Europe, Coenagrion ornatum is a species of conservation interest and is listed as Near Threatened due to habitat loss; it is nearly extinct in Italy. We report the finding of 4 male C. ornatum on 3 June 2005 in Apulia, southeastern Italy. This is the only recent record for Italy, and highlights the need for further research on this species in the country.
Main Text
The Ornate Bluet (Coenagrion ornatum) is a coenagrionid dragonfly ranging from west-central Europe through eastern and southeastern Europe to southwestern Asia, with the easternmost records from Iran and south-west Turkmenistan (Boudot & Kulijer 2015). It is rare and local in western and central Europe due to major population declines in the past; additionally, these populations are highly disjunct, probably due to anthropic factors, habitat loss foremost among them (Kalkman et al. 2010; Riservato et al. 2009). Coenagrion ornatum is a specialized species confined to seepages, spring waters with a thin water film and small sunny brooks, streamlets and ditches with organic mud and dense hygrophilous herbaceous vegetation (Boudot 2014).
For these reasons, the Ornate Bluet is listed as Near Threatened in Europe and in the Mediterranean basin (Kalkman et al. 2010; Riservato et al. 2009), and is included in Annex II of the Habitats Directive. The status of C. ornatum in Italy (Fig. 1) is unknown due to the lack of any data from the 21st century (Nielsen & Conci 1951, Fiorenza et al. 2013; Riservato et al. 2014a; Riservato et al. 2014b).
Four male C. ornatum were observed by the authors on 3 June, 2015 along the Gravina stream (Gravina in Puglia, province of Bari, Apulia, 330 m), about 80 km southwest of Cerignola (province of Foggia, Apulia, 120 m), the only other known locality for this species in southern Italy (Nielsen & Conci 1951) (Fig. 1).
The site (Fig. 2) is a sunny, partly regulated stream with modest current and shallow waters (average depth less than 50 cm), an average width of 1.5 meters, and extensive riparian vegetation dominated by grasses and small shrubs, especially rushes. The stream is located on a vast karst plateau (Alta Murgia) that is also a Natura 2000 site (cod. IT9120007); nevertheless, the discovery site is located in an agricultural, suburban area poorly investigated by odonatologists.
In order to arrive at a correct identification, one specimen was collected and is held in the private collection of the senior author (F. Mastropasqua). In addition to C. ornatum, the following species of Odonata were found: Calopteryx haemorrhoidalis (Vander Linden, 1825), Calopteryx splendens (Harris, 1780), Platycnemis pennipes (Pallas, 1771), Ischnura elegans (Vander Linden, 1820), Ischnura pumilio (Charpentier, 1825), Coenagrion caerulescens (Fonscolombe, 1838), Coenagrion puella (Linnaeus, 1758), Erythromma lindenii (Sélys-Longchamps, 1840), Ceriagrion tenellum (Villers, 1789), Anax imperator Leach, 1815, Libellula depressa Linnaeus, 1758, Libellula fulva Müller, 1764, Orthetrum brunneum (Fonscolombe, 1837) and Crocothemis erythraea (Brullé, 1832). During a second survey on 8 July, 2015 we found Onychogomphus forcipatus (Linnaeus, 1758), but did not find any additional individuals of C. ornatum.
The conservation status of C. ornatum in Italy is unknown. The new record of C. ornatum confirms the continued existence of this species in Italy, 76 years after the last sighting (Conci & Nielsen 1956; Riservato et al. 2014b). The species has limited ability to disperse (Boudot 2014) and therefore it seems likely that C. ornatum has been present all along in Apulia, without ever having been observed. This might be true as well for northeastern Italy, where C. ornatum has been collected in the past, but has not been found in recent years (Riservato et al. 2014b).
In any event, this is certainly a rare and local species in Italy, where it is threatened with extinction, all the more reason to pursue additional research on this poorly known species, which is able to live in canals and man-made ditches in farmland environments (Boudot 2014).
Since the site where C. ornatum was found is part of a Site of Community Importance (SCI; cod IT9120007), it is important to update the Standard Data Form for the SCI itself, in order to make site managers aware of the presence of this rare, protected species and cognizant of the importance to improve our knowledge of its population status.
Acknowledgements
The authors would like to thank Sönke Hardersen and Ali Šalamun for valuable advice, Ottavio Janni for english text review. An anonymous referee also provided useful suggestions on a previous version of the article.
Copyright & License
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Author
Fabio MASTROPASQUA
Author
Cristiano LIUZZI