Abstract
Diatoms have been long collected from the Southern Ocean but almost no data exist for epiphytic communities, despite their high ecological significance as an important food source in Antarctic coastal food chains. Here, we present a first growth form analysis of diatoms associated with rhodophyte hosts from Terra Nova Bay, Ross Sea, Antarctica. We performed this study to gather baseline information on the species composition of epiphytic diatom communities, determine the influence of some environmental variables on the diatom distribution patterns, and assess the caveats that must be taken into account in terms of sampling design. Macroalgal material was collected during the Italian Antarctic expeditions between 1990 and 2004. Epiphytic diatoms were studied by means of scanning electron microscopy. In terms of growth forms, there were no significant differences between the diatom communities on the different macroalgal host species. Motile (mainly small-celled Navicula perminuta and other Navicula spp.) and adnate (Cocconeis spp.) diatoms dominated the community throughout the study period. Many of the macroalgal blades examined were also covered by epiphytic animals (calcareous bryozoans, hydroids) over most of their surface, with a significant effect on the associated diatom community structure. Our findings suggest that the bio-physicochemical characteristics of each sampling site affected the epiphytic diatom communities more than the substrate type provided by the macroalgal host or the sampling depth.
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Acknowledgments
We wish to thank all colleagues who contributed to the collection of macroalgae from Terra Nova Bay during the austral summers considered in this study: Buia M.C. (collection in 1995); Nigro M. and Regoli F. (1997/1998, 1999/2000), Micaletto G. (2000/2001), Piraino S. (2001/2002), and Patti F.P. (2004). We recall here with affection Lucia Mazzella (1947–1999), who collected the samples in the austral summer of 1993/1994 and contributed initially to the study of benthic diatoms at Terra Nova Bay. This study was financially supported by the Second University of Naples as part of a PhD thesis and by Italian National Program of Research in Antarctica (PNRA) with the coordination of the National Research Council (CNR).
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Majewska, R., Gambi, M.C., Totti, C.M. et al. Growth form analysis of epiphytic diatom communities of Terra Nova Bay (Ross Sea, Antarctica). Polar Biol 36, 73–86 (2013). https://doi.org/10.1007/s00300-012-1240-1
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DOI: https://doi.org/10.1007/s00300-012-1240-1