Postglacial succession of caddisfly (Trichoptera) assemblages in a central European montane lake

Vodrak, D and Schafstall, N B and Chvojka, P and Chiverrell, R C and Kuosmanen, N and Tatosova, J and Clear, J L (2019) Postglacial succession of caddisfly (Trichoptera) assemblages in a central European montane lake. Biologia. ISSN 0006-3088

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Abstract

The Bohemian Forest lakes, situated along the Czech-German-Austrian border, were strongly affected by atmospheric acidifi- cation between the 1950s and the late 1980s. The subsequent chemical recovery of the lake water should precede and enable a biological recovery, including changes in caddisfly (Insecta: Trichoptera) assemblages. Nevertheless, local pre-acidification data and detailed knowledge of the lake district history are missing, making evaluation of lake recovery difficult. We performed high-resolution analysis of caddisfly remains in a 2.2 m long sediment profile from Prášilské Lake covering the complete history of the lake-catchment evolution. Caddisfly larvae are good indicators of environmental conditions and their subfossil remains are well preserved in unconsolidated waterlaid sediments. A total of 10 caddisfly morpho-taxa were found providing a record from 11,400 cal. yr. BP to the present. With the exception of Athripsodes aterrimus, all identified species are currently present in the Bohemian Forest glacial lakes or their inflow streams but not all of them are documented in Prášilské Lake. The caddisfly fauna consisted of acid-resistant, acid-tolerant and eurytopic species since the Early Holocene. Based on our results, the acid, dystrophic state of Prášilské Lake has been occurring since the lake formation. We conclude that the first signs of natural acidification appeared not later than during the Holocene onset in the Bohemian Forest region. Furthermore, we did not detect any abrupt changes in the species composition connected to the period of anthropogenic acidification during the twentieth century. This study provides for the first time a record of postglacial succession of caddisfly assemblages in a central European mountain lake.

Item Type: Article
Additional Information and Comments: This is the author's version of an article that was accepted for publication in Biologia, published by Springer. The final, published version is available from https://link.springer.com/article/10.2478/s11756-019-00249-4
Faculty / Department: Faculty of Science > Geography and Environmental Science
Depositing User: Jennifer Clear
Date Deposited: 04 Jul 2019 12:48
Last Modified: 04 Jul 2019 12:48
URI: http://hira.hope.ac.uk/id/eprint/2897

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