First Recent Record of Macronychus quadrituberculatus Müller,1806 (Elmidae: Coleoptera) in Serbia

Boris Novaković1 and Gabor Mesaroš2

 

 

 

1 Serbian Environmental Protection Agency, Ministry of Agriculture and Environmental Protection, Ruze Jovanovica 27a, 11160 Belgrade, E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

2 Lazarevačka 2, 24000 Subotica; E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

 

 

Abstract

During the Regular Water Quality Monitoring Program in Serbia conducted in 2013 by the Serbian Environmental Protection Agency (SEPA), an adult specimen of freshwater riffle beetle Macronychus quadrituberculatus Müller, 1806 (Elmidae: Coleoptera) was sampled on September 27th, 2013 in the town of Svilajnac at the Resava River (Central Serbia; N 44° 13' 40.527", E 21° 11' 52.097"). This is the first record of the species in Serbia in recent years.

Keywords: Macronychus quadrituberculatus, first recent record, Resava River, Serbia.

 

 

Riffle Beetle Macronychus quadrituberculatus Müller, 1806 (Figure 1)

Macronychys quadrituberculatus Müller, 1806 is a western European species reaching as far as Morocco, the Central Russian steppe and Hungary, absent in Denmark, Norway and Sweden, but found in Finland and the Baltic States (Foster, 2010). Considering its habitat preference and ecology, M. quadrituberculatus is a lowland species, usually found clinging to submerged tree trunks in deep, permanent water in rivers. The larva is wireworm-like and burrows into wet wood where it pupates (IBIDEM). Because of the elmid method of plastron respiration, the major perceived threat to elmids is the reduction in dissolved oxygen associated with pollution. This problem must be particularly acute in species living in deep, permanent water, but M. quadrituberculatus adults can be found on timber in oxygen-poor backwaters (IBIDEM).

The larvae and adults feed on algae and/or decaying wood, and the larvae pupate in the wood underwater. Although adults can be collected at light (Kovacs et al, 1999) many specimens have strongly reduced wings and can not be attracted to the light as they can not fly (Jaskula et al, 2011) . It is often found in somewhat polluted streams (Jaskula et al, 2005).

Boukal et al (2007) mentioned that M. quadrituberculatus known in the Czech Republic only from more or less isolated populations in epirhithral to epipotamal parts of streams and rivers, so far with four recent localities in Bohemia and eight in southern Moravia, including data from the Jihlava River published by Nemcova (2001).

It can be abundant under favourable conditions, and we expect to increase the number of localities in Serbia when more sampling is undertaken. Lokaj (1869) and Fleischer (1927-30) reported it even in the Vltava River in Praha. A xylobiont species, found only on submerged decaying wood of deciduous trees, sometimes in the same localities as Potamophilus acuminatus and/or Elmis obscura (Boukal et al, 2007).

In Poland, the species recent findings originated from seven localities in 2003 (Jaskula et al, 2005). These records suggest that it can also tolerate alpha-mesosaprobic and even polysaprobic waters (IBIDEM). M. quadrituberculatus was also recorded at many localities in Hungary (Kovacs et al, 1999; Csabai and Mora, 2003). In the opposite, there are only two records from Greece (Jaskula et al, 2011).

Jach et al. (2006) mentioned that M. quadrituberculatus is present in the Federal Republic of Yugoslavia, but without data on its findings and localities. In 2012 the species is recorded in the Sava River in Croatia (Ćuk et al, 2014).

During the Regular Water Quality Monitoring Program in Serbia conducted in 2013 by the Serbian Environmental Protection Agency (SEPA), an adult specimen of freshwater riffle beetle Macronychus quadrituberculatus Müller, 1806 (Elmidae: Coleoptera) was sampled on September 27th, 2013 in the town of Svilajnac at the Resava River (Central Serbia; the Velika Morava River Lower Basin; UTM EP 19; N 44° 13' 40.527", E 21° 11' 52.097"; at 91 meters a.s.l.). This is the first record of the species in recent years in Serbia. In the same sample, an adult specimen of the dryopid beetle Pomatinus substriatus was found as well.

 

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Figure 1: Macronychus quadrituberculatus Müller, 1806  – an adult specimen from the  Resava River (photo by G. Mesaroš)