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Taxon-specific d 13 C analysis of chitinous invertebrate remains in sediments from Strandsjön , Sweden
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hardenbroek, Maarten Van Bastviken, David Andersen, Thorbjørn Joest Heiri, Oliver |
| Copyright Year | 2014 |
| Abstract | Taxon-specific stable carbon isotope (dC) analysis of chitinous remains of invertebrates can provide valuable information about the carbon sources used by invertebrates living in specific habitats of lake ecosystems (for example, sediments, water column, or aquatic vegetation). This is complementary to dC of sedimentary organic matter (SOM), which provides an integrated signal of organic matter produced in a lake and its catchment, and of diagenetic processes within sediments. In a sediment record from Strandsjön (Sweden) covering the past circa 140 years, we analyzed SOM geochemistry (dC, C:Natomic, organic carbon content) and d C of chitinous invertebrate remains in order to examine whether taxon-specific dC records could be developed for different invertebrate groups and whether these analyses provide insights into past changes of organic carbon sources for lacustrine invertebrates available in benthic and planktonic compartments of the lake. Invertebrate taxa included benthic chironomids (Chironomus, Chironomini excluding Chironomus, Tanytarsini, and Tanypodinae), filter-feeders on suspended particulate organic matter (Daphnia, Plumatella and Cristatella mucedo), and Rhabdocoela. dC of chironomid remains indicated periodic availability of C-depleted carbon sources in the benthic environment of the lake as dC values of the different chironomid taxa fluctuated simultaneously between -34.7 and -30.5 % (VPDB). Daphnia and Bryozoa showed parallel changes in their dC values which did not coincide with variations in dC of chironomids, though, and a 2–3 % decrease since circa AD 1960. The decrease in dC of Daphnia and Bryozoa could indicate a decrease in phytoplankton dC as a result of lower lake productivity, which is in accordance with historical information about the lake that suggests a shift to less eutrophic conditions after AD 1960. In contrast, Rhabdocoela cocoons were characterized by relatively high dC values (-30.4 to -28.2 %) that did not show a strong temporal trend, which could be related to the predatory feeding mode and wide prey Electronic supplementary material The online version of this article (doi:10.1007/s10933-014-9780-8) contains supplementary material, which is available to authorized users. M. van Hardenbroek (&) ! O. Heiri Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland e-mail: vanhardenbroek@soton.ac.uk M. van Hardenbroek ! A. F. Lotter Palaeoecology, Laboratory of Palaeobotany and Palynology, Department of Physical Geography, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands D. Bastviken Department of Thematic Studies Water and Environmental Studies, Linköping University, 58183 Linköping, Sweden T. J. Andersen Department of Geography and Geology, University of Copenhagen, 1350 Copenhagen K, Denmark 123 J Paleolimnol (2014) 52:95–105 DOI 10.1007/s10933-014-9780-8 Author's personal copy |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://eprints.soton.ac.uk/378298/1/van%2520Hardenbroek%2520et%2520al%25202014%2520Strandsjon.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Invertebrates |
| Content Type | Text |
| Resource Type | Article |
