Paleoreconstruction of ecological changes in filled up lake using subfossil chironomids - preliminary results from the Vihorlat Mts, Slovakia
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| Year of publication | 2013 |
| Type | Conference abstract |
| MU Faculty or unit | |
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| Description | This study brings the preliminary results of paleorecostruction of ecological changes in history of paleolake based on subfossil chironomid head capsules. The study site, small filled up lake (area of 2.3 ha) in altitude of 820 m a. s. l., is located in the Vihorlat Mountains, 20 km westwards from Ukraine boundary in the East of Slovakia (48 g. 54' 46" N, 22 g. 09' 52" E). The catchment of palaeolake (45 ha) is placed on SE slope of the Motrogon hill and covered dominantly by broad-leaved forest. The uppermost 3.2 m thick layer of the lake is filled by peat and macroremnants at present, bud lower limnic layer, which goes to the total depth of 11,3 m, consisting of different types of gyttja. For the pilot analysis we use the lowermost 7.9 m of limnic sediment, which was separated into 5 cm thick layers. In this part of core we select ten pilot chironomid samples in different layers (340-45, 530-35, 540-45, 705-10, 720-25, 920-25, 955-60, 1015-20, 1040-45, 1085-90 cm) according macroscopically distinguishable changes in gyttja colour. In total we found 695 specimens of 40 chironomid taxa. The preliminary results indicate depiction of transition between Late Glacial and Holocene on relatively very long core with evidence of human impact in the uppermost zone only (pers. comm. Libor Petr). The first insight into chironomid assemblages promises very valuable material for analyses of detailed record of ecological changes in history of the paleolake, however much higher number of treated layers is needed to get more reliable results. Study was supported by research projects of the Grant agency of the Czech Republic (GAP504/11/0429). |
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