Subfossil shell margins and tail spines of Daphnia in Finnish lake sediments - is Daphnia underrepresented in cladocera analysis?

• Autorzy: Sarmaja-Korjonen K.
• Języki publikacji: EN

Abstrakty

EN

One of the shortcomings of the analysis of subfossil Cladocera (water flee) remains is that preservation of remains is selective. Of Daphnia spp. which are very common in zooplankton assemblages of lakes, usually only postabdominal claws and ephippia are found. In the present paper I describe Daphnia shell margins and some tail spines from the Holocene sediments of a lake in southern Finland where the margins were much more abundant than the postabdominal claws, indicating that postabdominal claws may be underrepresented. Daphnia claws, shell margins and tail spines were found also in surface samples of 17 Finnish lakes and thus the abundance of tail spines could be compared with that of postabdominal claws. The results showed that in most cases the tail spines are more abundant than postabdominal claws and may give a closer estimate of the true abundance of Daphnia. However, in some lakes claws were clearly more frequent than tail spines. Apparently, there are differences in preservation of different types of Daphnia remains between lakes, possibly connected with water chemistry. Overall, the results indicate that probably Daphnia remains are always underrepresented in lake sediments.

Słowa kluczowe

EN

subfossial Dalphina remains; tail spines; shell margines; lake sediments; Finland

• Wydawca: Institute of Geological Science Polish Academy of Science
• Czasopismo: Studia Quaternaria
• Rocznik: 2007
• Tom: Vol. 24
• Strony: 61--64
• Opis fizyczny: Bibliogr. 9 poz.

Twórcy

autor

Sarmaja-Korjonen K.

• Department of Geology, P.O. Box 64, FIN-00014 University of Helsinki, Finland,,

Bibliografia

• Frey D.G. 1986. Cladocera analysis. In Berglund B.E. (ed) Handbook of palaeoecology and palaeohydrology, 667-692, J. Wiley & Sons Chichester.
• Frey D.G. 1991. First subfossil records of Daphnia headshields and shells (Anomopoda, Daphnidae) about 10,000 years old from northernmost Greenland, plus Alona guttata (Chydoridae). Journal of Paleolimnology 6, 193-197.
• Korhola A. 1999. Distribution patterns of Cladocera in subarctic Fennoscandian lakes and their potential in environmental reconstruction. Ecography 22, 357-373.
• Korhola A., Rautio M. 2001. Cladocera and other branchiopod crustaceans. In Smol J.P., Birks H.J.B., Last W.M. (eds) Tracking Environmental Change Using Lake Sediments, Volume 4: Zoological Indicators, 5-41, Kluwer Academic Publishers, Dordrecht.
• Manca M., Comoli P. 2004. Reconstructing long-term changes in Daphnia's body size from subfossil remains in sediments ofa small lake in the Himatayas. Journal of Paleolimnology 32, 1-13.
• Manca M., Comoli P., Margaritora F.G. 1999. An unusual type of Daph nia head shields from plankton and sediments of Himalayan lakes. Journal of Limnology 58, 29-32.
• Nevalainen L. 2004. The palaeolimnological development of Lake Arapisto, southern Finland, reflected by subfossil Cladocera and diatoms (original: Karkkilan Aapisto-jarvenpaleolimno-loginen kehitys vesikirppujen ja piilevien kuvastamana). MSc thesis, Department of Geography, University of Helsinki (in Finnish).
• Sarmaja-Korjonen K., Seppa H. subm. Contistent retponse of aquatic and terrestrial ecosystems to the 8200 cal yr cold event - a lacustrine record from Lake Arapisto, Finland. (Submitted to The Holocene).
• Szeroczyńska K., Zawisza E. 2005. Daphnia remains from the sediment of Lake Somaslampi (NW Finnish Lap land) and Lake Wigry (NE Poland). Studia Quaternaria 22, 55-57