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Ischnura hastata – a new species for Graciosa Island , Azores , Portu gal ( Odonata : Coenagrionidae )
| Content Provider | Semantic Scholar |
|---|---|
| Author | Vieira, Virgílio Emanuel Cordero-Rivera, Adolfo |
| Copyright Year | 2017 |
| Abstract | A small population of Ischnura hastata (Say, 1839) was observed on 20-viiand 21-vii-2016 at the freshwater pond ‘Charco da Caldeira’ in the Caldeira of Graciosa island, Portugal. It constitutes both the first record in this island and the presence in all major islands of the Azores archipelago. Further key words. Dragonfly, damselfly, Zygoptera, Anisoptera, parthenogenesis, eutrophication, dispersal Introduction The Azores is a volcanic archipelago situated in the North Atlantic Ocean (38°30’N, 28°0’W), composed of nine islands. They belong to the Macaronesia biogeographical region, the archipelagos of which share similar evergreen forest (Borges et al. 2010; Rego et al. 2015). Graciosa (39°2’38’’N, 27°59’1’’W) is the second smallest (61 km2), and the lowest island of the archipelago with the maximum altitude of 402 m a.s.l.. Because of its outermost position within the central group of islands, the odonate fauna of Graciosa is less explored than that of the other islands of the Azores (Vieira & Cordero-Rive ra 2013). Four Odonate species have been considered resident in the Azores islands (cf. Weihrauch 2011; Vieira & Cordero-Rive ra 2013, 2015a, 2015b), namely: Ischnura hastata (Say, 1839), I. pumilio (Charpentier, 1825), Anax imperator Leach, 1815, and Sympetrum fonscolombii (Selys, 1840). Further a migrant species, Pantala flavescens (Fabricius, 1798), was recently recorded for São Miguel Island (Vieira & Cordero Rive ra 2015a). Ischnura hastata is native to the Americas (Belle & van Tol 1990; Westfall & May 2006) and its populations found in the Azores archipelago represent the only known example of parthenogenesis in the order Odonata (Cordero-Rivera et al. 2005; Loren zo-Carballa et al. 2009). All four species were known from all islands except Graciosa, from which only A. imperator and S. fonscolombii had been reliably recorded (CorderoRivera et al. 2005; Vieira & Cordero-Rive ra 2013, 2015b). Very few records of odonates have been published for this island. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.odonatologica.com/wp-content/uploads/2017/07/Vieira_Cordero-Rivera.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
