Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms
14 pages, 3 figures, 3 tables The species composition of spring blooms varies over open marine regions, displaying both spatial and inter-annual differences. We used semi-continuous cultures to promote species-specific blooms and investigate associated microbial food-web dynamics and inorganic nutri...
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Online Access: | http://hdl.handle.net/10261/135005 https://doi.org/10.3354/ame034079 |
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ftcsic:oai:digital.csic.es:10261/135005 2024-02-11T10:01:40+01:00 Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms Lovejoy, Connie Price, N.M. Legendre, L. 2004-01 http://hdl.handle.net/10261/135005 https://doi.org/10.3354/ame034079 unknown Inter Research Publisher's version https://doi.org/10.3354/ame034079 Sí doi:10.3354/ame034079 issn: 0948-3055 e-issn: 1616-1564 Aquatic Microbial Ecology 34(1): 79-92 (2004) http://hdl.handle.net/10261/135005 open Nutrient supply Protist species Spring-bloom initiation Succession Phytoplankton Marine Arctic artículo http://purl.org/coar/resource_type/c_6501 2004 ftcsic https://doi.org/10.3354/ame034079 2024-01-16T10:16:35Z 14 pages, 3 figures, 3 tables The species composition of spring blooms varies over open marine regions, displaying both spatial and inter-annual differences. We used semi-continuous cultures to promote species-specific blooms and investigate associated microbial food-web dynamics and inorganic nutrient utilization. Beginning with high-nutrient, low-biomass water from 13 in depth, we compared the changes that took place over 9 d in 2 treatments: (1) NEW, a 'new-nutrient' treatment that simulated horizontal or vertical advection; every 2 d, both particles and dissolved organic matter were removed and ca. 25 % of the volume of the container was replaced with nutrient-rich seawater from 200 m depth. (2) REC, a recycling treatment simulating grazing and sinking losses without nutrient replacement, i.e. conditions mimicking sharply stratified water columns; in this treatment the same volume of water was removed, but was then returned to the container following filtration through a 2.0 μm filter. In the NEW treatment, diatoms consumed the added nutrients and dominated the production and biomass of the protist community. Total protist community production in the REC treatment was significantly lower than in the NEW treatment, with either a late or no diatom bloom and prymnesiophytes such as Phaeocystis spp. attaining higher proportional biomass. Total production rates for heterotrophic protists, bacteria and viruses did not differ significantly between treatments. Nutrient consumption by the ensuing communities differed between the 2 treatments, with a significantly greater proportion of total inorganic nutrients consumed in the NEW than in the REC treatment. The results demonstrate that the character of nutrient supply and loss influences protist community structure and subsequent bulk nutrient utilization The Natural Sciences and Research Council of Canada (NSERC) and the Department of Fisheries and Oceans Canada funded the International North Water Polynya Study led by Dr. L. Fortier. NSERC and the fonds of FCAR ... Article in Journal/Newspaper Arctic Phytoplankton Digital.CSIC (Spanish National Research Council) Arctic Canada Aquatic Microbial Ecology 34 79 92 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Nutrient supply Protist species Spring-bloom initiation Succession Phytoplankton Marine Arctic |
spellingShingle |
Nutrient supply Protist species Spring-bloom initiation Succession Phytoplankton Marine Arctic Lovejoy, Connie Price, N.M. Legendre, L. Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms |
topic_facet |
Nutrient supply Protist species Spring-bloom initiation Succession Phytoplankton Marine Arctic |
description |
14 pages, 3 figures, 3 tables The species composition of spring blooms varies over open marine regions, displaying both spatial and inter-annual differences. We used semi-continuous cultures to promote species-specific blooms and investigate associated microbial food-web dynamics and inorganic nutrient utilization. Beginning with high-nutrient, low-biomass water from 13 in depth, we compared the changes that took place over 9 d in 2 treatments: (1) NEW, a 'new-nutrient' treatment that simulated horizontal or vertical advection; every 2 d, both particles and dissolved organic matter were removed and ca. 25 % of the volume of the container was replaced with nutrient-rich seawater from 200 m depth. (2) REC, a recycling treatment simulating grazing and sinking losses without nutrient replacement, i.e. conditions mimicking sharply stratified water columns; in this treatment the same volume of water was removed, but was then returned to the container following filtration through a 2.0 μm filter. In the NEW treatment, diatoms consumed the added nutrients and dominated the production and biomass of the protist community. Total protist community production in the REC treatment was significantly lower than in the NEW treatment, with either a late or no diatom bloom and prymnesiophytes such as Phaeocystis spp. attaining higher proportional biomass. Total production rates for heterotrophic protists, bacteria and viruses did not differ significantly between treatments. Nutrient consumption by the ensuing communities differed between the 2 treatments, with a significantly greater proportion of total inorganic nutrients consumed in the NEW than in the REC treatment. The results demonstrate that the character of nutrient supply and loss influences protist community structure and subsequent bulk nutrient utilization The Natural Sciences and Research Council of Canada (NSERC) and the Department of Fisheries and Oceans Canada funded the International North Water Polynya Study led by Dr. L. Fortier. NSERC and the fonds of FCAR ... |
format |
Article in Journal/Newspaper |
author |
Lovejoy, Connie Price, N.M. Legendre, L. |
author_facet |
Lovejoy, Connie Price, N.M. Legendre, L. |
author_sort |
Lovejoy, Connie |
title |
Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms |
title_short |
Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms |
title_full |
Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms |
title_fullStr |
Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms |
title_full_unstemmed |
Role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms |
title_sort |
role of nutrient supply and loss in controlling protist species dominance and microbial food-webs during spring blooms |
publisher |
Inter Research |
publishDate |
2004 |
url |
http://hdl.handle.net/10261/135005 https://doi.org/10.3354/ame034079 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Phytoplankton |
genre_facet |
Arctic Phytoplankton |
op_relation |
Publisher's version https://doi.org/10.3354/ame034079 Sí doi:10.3354/ame034079 issn: 0948-3055 e-issn: 1616-1564 Aquatic Microbial Ecology 34(1): 79-92 (2004) http://hdl.handle.net/10261/135005 |
op_rights |
open |
op_doi |
https://doi.org/10.3354/ame034079 |
container_title |
Aquatic Microbial Ecology |
container_volume |
34 |
container_start_page |
79 |
op_container_end_page |
92 |
_version_ |
1790597476927930368 |