Publication details
První nálezy a fenologie netopýra Saviova (Hypsugo savii) na Děčínsku (Chiroptera: Vespertilionidae)
| Title in English | First findings and phenology of Hypsugo savii in the Děčín District, Czech Republic (Chiroptera: Vespertilionidae) |
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| Authors | |
| Year of publication | 2018 |
| Type | Article in Periodical |
| Magazine / Source | Lynx, n. s. (Praha) |
| MU Faculty or unit | |
| Citation | |
| Keywords | Automatic detectors semi-automatic software phenology of migration bats |
| Description | As part of the bat research in Děčín district, two automatic detectors were installed in two locations between April and September 2016, i.e. in the canyon of the Elbe River near Hřensko and the small pond Pavlínka near Jetřichovice. The acoustic recordings were further analysed using the semi-automatic software SonoChiro, which is capable of evaluating a large number of bat signals in a relatively short time. Altogether 942k echolocation signals and 18 bat species were determined. The highest values of the identification reliability index had recordings of the echolocation signals of the bat genera Pipistrellus, Nyctalus and Vespertilio. Conversely, the species of the genus Myotis, especially those with peak frequencies above 35 kHz, have been identified with little precision. Hypsugo savii, mediterranean species has been spreading over the past decade, has been identified in the both studied localities. This is the northernmost finding of species in central Europe so far. Significantly higher flight activity of H. savii was detected in the Elbe canyon. The recordings were from three periods: 1) spring migration from mid-April to late May, 2) dispersion of individuals after the disintegration of the nursery colonies during the second half of July and 3) autumn migration from late August and early September, when the highest numbers of signals were detected. In spring migration and summer dispersion, most of the signals came from bats heading north, downstream of the Elbe river. On the contrary, during the autumn migration, most of the signals were recorded from the bats heading south, upstream of the river. H. savii is a species its echolocation signals can be easily identified and thus an acoustic approach in the study of migration phenology would be an appropriate and very effective method. |