The Role of Phaeodarian Radiolarians in Antarctic BiologicalOceanic Processes
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{'SignBlockName': 'Polly A. Penhale', 'PO_EMAI': 'ppenhale@nsf.gov', 'PO_PHON': '7032927420'}
Phaeodarian radiolarians are planktonic protozoans that play a role in          oceanic carbon and silica cycles.  Phaeodarians have been largely               ignored in Antarctic waters because their distributions are so                  different from those of other protozoans.  They have several                    characteristics that make them unique among protozoans and potentially          important in the Southern Ocean.  Phaeodarians consume a wide variety           of foods from bacteria to small metazoans, especially siliceous cells           and particles.  When phaeodarians die, their siliceous skeletons are            more susceptible to dissolution than polycystine skeletons.  In                 Antarctic waters where large phaeodarians can be more abundant than in          other oceans, a large phaeodarian below the euphotic zone represents a          substantial amount of silica.  Phaeodarians are also potential links            between nanoplankton populations and macrozooplankton.  Gowing will             determine the abundance and distribution of phaeodarians and                    polycystines, and investigate the feeding biology of phaeodarians by            vacule content analysis and measurement of feeding rates.  These                investigations will be the first steps in determining the importance of         phaeodarians in Antarctic carbon and silica cycles and in food webs.
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