Abstract
Nubensia nubens (Edwards 1929) is reported for the first time in Bulgaria from two lowland rivers, tributaries of the Danube (eastern Europe). Larvae of the species were found incidentally in samples collected for an ichthyological study, in the gut contents of Neogobius melanostomus (Pallas 1814) (Actinopterygii: Gobiidae), and in a benthic sample. The habitat conditions at the corresponding sites differed from those of previous records. Our finding underlines the potential of non-standard supporting methods, such as analyzing fish gut contents for discovering rare species that are hard to record by standard hydrobiological methods.
Highlights
The larvae and adult female of Nubensia nubens (Edwards 1929) were described and placement of the species in a separate genus was suggested (Spies and Dettinger-Klemm 2015)
The present study focuses on two Bulgarian tributaries flowing into the Bulgarian-Romanian sector of the Danube River (Eastern Europe)
A single individual was found intact in the gut of a Neogobius melanostomus from the Iskar River (Fig. 1), where other invertebrates contributed to the overall gut content
Summary
The larvae and adult female of Nubensia nubens (Edwards 1929) were described and placement of the species in a separate genus was suggested (Spies and Dettinger-Klemm 2015). Hydrobiological studies have produced taxonomic lists of the Chironomidae from standing water bodies in the same region (Trichkova et al 2013); no synonyms of N. nubens are mentioned. The study area includes the Iskar and Vit rivers, which flow in northern Bulgaria (Table 1).
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