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Abundance of thraustochytrids and ciliated protozoans in a Mediterranean sandy shore determined by an improved, direct method Santangelo, G.; Bongiorni, L.; Pignataro, L. (2000). Abundance of thraustochytrids and ciliated protozoans in a Mediterranean sandy shore determined by an improved, direct method. Aquat. Microb. Ecol. 23(1): 55-61 In: Aquatic Microbial Ecology. Inter-Research: Oldendorf/Luhe. ISSN 0948-3055; e-ISSN 1616-1564

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Beschikbaar in	Auteurs
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Trefwoorden

Analysis > Sediment analysis Analytical techniques Coastal environments Coastal zone Distribution > Geographical distribution Distribution > Quantitative distribution Environments > Aquatic environment > Interstitial environment Environments > Aquatic environment > Marine environment MED, Ligurian Sea Methodology Microorganisms Population characteristics > Population density Sediments Sediments > Clastics > Sand Topographic features > Landforms > Coastal landforms > Beaches Ciliophora [WoRMS]; Thraustochytriaceae Sparrow, 1960 [WoRMS] Ligurian Sea [Marine Regions] Marien/Kust

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Auteurs		Top
Santangelo, G., correspondent Bongiorni, L. Pignataro, L.

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Abstract

Thraustochytrids (fungoid protoctists) and ciliated protozoans are major components of marine sandy shore microcommunities. However they are rarely enumerated together. This report describes the results obtained through application of an improved method for directly enumerating both of these microorganisms from sandy sediments. Thraustochytrids and ciliates were extracted by repeated washing with glutaraldehyde-seawater solution. To separate both microorganisms from non-living material the supernatant was centrifuged in a non-linear silica gel gradient, and then stained with 3 different fluorochromes. Sampling was carried out on a sheltered, medium-grain-sized sandy shore in the Ligurian Sea (NW Mediterranean). Ninety-six 1 ml replicated sand samples were collected. They were arranged following a nested ANOVA design in which factors were 3 successively smaller spatial scales (sampling units of different size, ranging between meters and centimeters). Sampling was repeated 3 times during the autumn-winter period. Average ciliate abundance was 44 ± 26 ml-1, showing a significant decrease with time (from autumn to winter). The average abundance of thraustochytrids was 42.4 ± 35.2 ml-1, with no significant decrease over time. Neither group of protists showed a spatial structure at the scales explored. Variability among replicated 1 ml samples was the main variance source for both microorganisms. The findings presented here are the first to address the distribution of thraustochytrids in marine sediments as determined by direct enumeration.

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