GRAZING RATE AND PARTICLE SIZE SELECTION BY THE CHOANOFLAGELLATE DIAPHANOECA GRANDIS FROM THE SEA-ICE OF LAGOON SAROMA KO, HOKKAIDO (Eleventh Symposium on Polar Biology)
Diaphanoeca grandis, a loricate choanoflagellate, is an abundant microheterotroph in many localities, including Antarctica. Little is known of its feeding selectivity or ingestion rates. In order to investigate the role of choanoflagellates in ice-covered marine environments, the grazing rates and p...
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| Format: | Report |
| Language: | English |
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Proceeding
1990
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| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5082 http://id.nii.ac.jp/1291/00005082/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5082&item_no=1&attribute_id=18&file_no=1 |
| Summary: | Diaphanoeca grandis, a loricate choanoflagellate, is an abundant microheterotroph in many localities, including Antarctica. Little is known of its feeding selectivity or ingestion rates. In order to investigate the role of choanoflagellates in ice-covered marine environments, the grazing rates and particle size selection by D. grandis from the bottom-ice community of lagoon Saroma Ko were measured using fluorescent latex microspheres (FM). Maximum uptake rate was around 2FM-cell^<-1>・h^<-1> and maximum clearance rate was 0.7 nl・cell^<-1>・h^<-1>. D. grandis was not able to ingest microspheres larger than 1 μm. These data are discussed in relation to their abundance, grazing rates by other protozoa and food availability in under-ice environments. |
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