Abstract
Plitvice National Park is situated in the mountainous karst area of Croatia. When conducting studies of the chironomid fauna of the park, we found that Diamesa thomasi Serra-Tosio, 1970 were abundant in the stream Bjela rijeka. The streams Bijela rijeka and Crna rijeka form the Matica River, which is the main surface-water supplier of the lakes in the park. This is the first record of D. thomasi in Croatia. The river’s source, the Bijela rijeka spring, is located at an altitude of 719 m a.s.l. at 44°50’05” N and 15°33’43” E. The Bijela rijeka spring is a rheocrene that dries out only during extremely dry years (Marusic & Curuvija 1991). Spring water emerges from substrate composed mainly of cobbles and sand with a few interspersed moss-covered boulders. Because of these characteristics, it is considered a psammorheocrene type of spring (Gerecke et al. 1998). The tree canopy is open during spring, and there is much aquatic vegetation and accumulated allochthonous organic material during autumn and winter.
Highlights
A pyramid-type emergence trap was operated at six locations from February 2007 to February 2008
In ventral view (Figs. 1E-F) the female genitalia of D. thomasi appear more similar to D. permacra
This study is important in that it expands the known distribution of D. thomasi
Summary
A pyramid-type emergence trap was operated at six locations from February 2007 to February 2008. Diamesa thomasi was recorded at three of them. We have collected 94 adult specimens of D. thomasi from these traps. Maximum number of specimens collected at one time is 48.
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