Efficiency of different mesh sizes for isolating fossil chironomids for stable isotope and radiocarbon analyses

van Hardenbroek, Maarten and Heiri, Oliver and Lotter, André F.. (2010) Efficiency of different mesh sizes for isolating fossil chironomids for stable isotope and radiocarbon analyses. Journal of Paleolimnology, 44 (2). pp. 721-729.

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/66998/

Downloads: Statistics Overview


We examined the effects of sieving with different mesh sizes on the efficiency of processing fossil chironomids from lake sediments for isotope analyses. Results obtained for three different sediments indicate that each of the studied sieve fractions (100-150, 150-200, 200-250, 250-300, > 300 mu m) contain a similar proportion of the overall mass of chironomid fossils in a sample. However, the sorting time needed to separate chironomids from other sieve residue is disproportionately large for smaller mesh sizes. Employing sieves with a 200-mu m rather than the 100-mu m mesh commonly used for standard palaeoecological analyses of fossil chironomids decreased processing time for a given mass of fossils by 30-58% in our study. For optimizing the efficiency of chironomid sample processing for stable isotope and radiocarbon analysis we therefore recommend a 200-mu m mesh size sieve, although the sorting of all > 100-mu m fractions may be necessary in sediments with low chironomid abundances. Excluding certain small taxa from isotope analysis, may structurally bias isotope values of samples. Therefore, further studies on taxon-specific isotope analysis are required to quantify these effects.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Geoökologie (Heiri)
UniBasel Contributors:Heiri, Oliver
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Nov 2020 15:04
Deposited On:30 Nov 2020 15:04

Repository Staff Only: item control page