EFFECTS OF DIFFERENT POTENTIAL FOOD SOURCES ON UPPER-BATHYAL BENTHIC FORAMINIFERA: AN EXPERIMENT WITH PROPAGULES

Abstract

Research Article| October 01, 2014 EFFECTS OF DIFFERENT POTENTIAL FOOD SOURCES ON UPPER-BATHYAL BENTHIC FORAMINIFERA: AN EXPERIMENT WITH PROPAGULES Christopher J. Duffield; Christopher J. Duffield 4 1Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, Norway 4Correspondence author. E-mail: c.j.duffield@geo.uio.no Search for other works by this author on: GSW Google Scholar Bente Edvardsen; Bente Edvardsen 2Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, N-0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar Wenche Eikrem; Wenche Eikrem 2Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, N-0316 Oslo, Norway3Norwegian Institute for Water Research, Gaustadalléen 21, 0349 Oslo, Norway Search for other works by this author on: GSW Google Scholar Elisabeth Alve Elisabeth Alve 1Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar Journal of Foraminiferal Research (2014) 44 (4): 416–433. https://doi.org/10.2113/gsjfr.44.4.416 Article history received: 30 Aug 2013 accepted: 04 Apr 2014 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Christopher J. Duffield, Bente Edvardsen, Wenche Eikrem, Elisabeth Alve; EFFECTS OF DIFFERENT POTENTIAL FOOD SOURCES ON UPPER-BATHYAL BENTHIC FORAMINIFERA: AN EXPERIMENT WITH PROPAGULES. Journal of Foraminiferal Research 2014;; 44 (4): 416–433. doi: https://doi.org/10.2113/gsjfr.44.4.416 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract A propagule experiment was designed to investigate the effects of different food types and varying sediment depths on the survival and growth of upper-bathyal benthic foraminifera, collected from surface-sediment cores in Oslofjord, Norway. Sediment that passed through a 53-μm sieve was used in the experiment. Any foraminifera >63 μm at the end of the experiment had therefore grown, indicating at least tolerable living conditions. The experiment was arranged into four sub-experiments to test foraminiferal responses to a lack of food input, algal medium, sediment depth (1- vs. 2-cm depth), and different food types. Potential food sources included monospecific algal cultures (the green alga Dunaliella tertiolecta, the haptophyte Emiliania huxleyi, and the diatoms Chaetoceros sp. and cf. Navicula), as well as phytoplankton and zooplankton from net hauls collected at the same sampling site. After six weeks all foraminiferal assemblages showed an increase in abundance, even those which were not fed. This suggests that most species (e.g., Textularia earlandi, Bathysiphon flexilis) were feeding on microbes or detritus already in the sediment. However, the addition of certain phytodetritus increased the abundance, suggesting that some species (e.g., Epistominella vitrea) are dependent on the input of this particular fresh phytodetritus. Conversely, certain types of detritus (E. huxleyi and zooplankton) appear detrimental to most species, except Elphidium excavatum which appeared resistant to the treatments inimicable to other species. Leptohalysis catella was the only species observed to respond positively to net hauls dominated by dinoflagellates. For some species (e.g., Stainforthia fusiformis, Nonionella iridea) the availability of a greater sediment depth stimulates growth more than the input of organic matter. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.