Ice-brine and planktonic microheterotrophs from Saroma-ko Lagoon, Hokkaido (Japan): quantitative importance and trophodynamics
Identifieur interne : 002160 ( Istex/Corpus ); précédent : 002159; suivant : 002161Ice-brine and planktonic microheterotrophs from Saroma-ko Lagoon, Hokkaido (Japan): quantitative importance and trophodynamics
Auteurs : Télesphore Sime-Ngando ; S. Kim Juniper ; Serge DemersSource :
- Journal of Marine Systems [ 0924-7963 ] ; 1997.
Abstract
Biologists have rarely had the opportunity to investigate the community characteristics and dynamics of heterotrophic microorganisms in highly productive first-year sea ice. In this study, sterile seawater was used as a salinity buffer to extract the ice-brine microheterotroph communities (bacteria, flagellates and ciliates) from a coastal lagoon in Japan (Saroma-ko, Hokkaido; 44°N, 144°E) during the late winter (February—March) of 1992. This procedure reduced osmotic shock during the melting of ice cores and allowed the recovery of up to 323% more cells than the traditional melting method. Most of the organisms were concentrated in the bottom 3–4 cm of the ice, where abundances were up to 33 times higher than in the plankton. In ice and plankton samples, heterotrophic flagellates were dominated by small species (< 8 μm, mainly choanoflagellates) and cryothecomonad-type cells while ciliates were dominated by a photosynthetic species, Mesodinium rubrum. In contrast to higher latitudes, increased snow cover appeared to favor the development of protozoa beneath the relatively thin 30–40 cm ice cover of Saroma-ko Lagoon. Temporally, a successional sequence was observed between protozoa and the bacterial compartment. Bacteria decreased in abundance throughout the sampling period while protozoa increased or attained their maximum number in late winter, toward the end of the sampling period. These observations support previous suggestions of the existence of a functional microbial food web within the sea-ice community. Heterotrophic flagellate biomass greatly exceeded bacterial biomass in the sea ice (30–60 x). Coupled with similar potential growth rates, this suggests the utilization of additional (non-bacterial) food items by ice-brine flagellates. Finally, the effects of salinity variations (ranging between 15 and 120 psu) on potential microheterotroph growth rates are discussed.
Url:
DOI: 10.1016/S0924-7963(96)00035-8
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Kim" last="Juniper">S. Kim Juniper</name><affiliation><mods:affiliation>GEOTOP and Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succ. “Centre-Ville”, Montréal, Qué. H3C 3P8, Canada</mods:affiliation></affiliation></author><author><name sortKey="Demers, Serge" sort="Demers, Serge" uniqKey="Demers S" first="Serge" last="Demers">Serge Demers</name><affiliation><mods:affiliation>INRS-Océanologie, 310 allée des Ursulines, Rimouski, Qué. G5L 3A1, Canada</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Marine Systems</title><title level="j" type="abbrev">MARSYS</title><idno type="ISSN">0924-7963</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997">1997</date><biblScope unit="volume">11</biblScope><biblScope unit="issue">1–2</biblScope><biblScope unit="page" from="149">149</biblScope><biblScope unit="page" to="161">161</biblScope></imprint><idno type="ISSN">0924-7963</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0924-7963</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Biologists have rarely had the opportunity to investigate the community characteristics and dynamics of heterotrophic microorganisms in highly productive first-year sea ice. In this study, sterile seawater was used as a salinity buffer to extract the ice-brine microheterotroph communities (bacteria, flagellates and ciliates) from a coastal lagoon in Japan (Saroma-ko, Hokkaido; 44°N, 144°E) during the late winter (February—March) of 1992. This procedure reduced osmotic shock during the melting of ice cores and allowed the recovery of up to 323% more cells than the traditional melting method. Most of the organisms were concentrated in the bottom 3–4 cm of the ice, where abundances were up to 33 times higher than in the plankton. In ice and plankton samples, heterotrophic flagellates were dominated by small species (< 8 μm, mainly choanoflagellates) and cryothecomonad-type cells while ciliates were dominated by a photosynthetic species, Mesodinium rubrum. In contrast to higher latitudes, increased snow cover appeared to favor the development of protozoa beneath the relatively thin 30–40 cm ice cover of Saroma-ko Lagoon. Temporally, a successional sequence was observed between protozoa and the bacterial compartment. Bacteria decreased in abundance throughout the sampling period while protozoa increased or attained their maximum number in late winter, toward the end of the sampling period. These observations support previous suggestions of the existence of a functional microbial food web within the sea-ice community. Heterotrophic flagellate biomass greatly exceeded bacterial biomass in the sea ice (30–60 x). Coupled with similar potential growth rates, this suggests the utilization of additional (non-bacterial) food items by ice-brine flagellates. Finally, the effects of salinity variations (ranging between 15 and 120 psu) on potential microheterotroph growth rates are discussed.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>Télesphore Sime-Ngando</name><affiliations><json:string>E-mail: simengando@cicsun.univ-bpclermont.fr</json:string><json:string>CNRS-URA 1944, Biologie Comparée des Protistes, Université Blaise Pascal (Clermont-Ferrand II), les Cézeaux, F-63177 Aubière, Cedex, France</json:string></affiliations></json:item><json:item><name>S.Kim Juniper</name><affiliations><json:string>GEOTOP and Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succ. “Centre-Ville”, Montréal, Qué. H3C 3P8, Canada</json:string></affiliations></json:item><json:item><name>Serge Demers</name><affiliations><json:string>INRS-Océanologie, 310 allée des Ursulines, Rimouski, Qué. 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In this study, sterile seawater was used as a salinity buffer to extract the ice-brine microheterotroph communities (bacteria, flagellates and ciliates) from a coastal lagoon in Japan (Saroma-ko, Hokkaido; 44°N, 144°E) during the late winter (February—March) of 1992. This procedure reduced osmotic shock during the melting of ice cores and allowed the recovery of up to 323% more cells than the traditional melting method. Most of the organisms were concentrated in the bottom 3–4 cm of the ice, where abundances were up to 33 times higher than in the plankton. In ice and plankton samples, heterotrophic flagellates were dominated by small species (> 8 μm, mainly choanoflagellates) and cryothecomonad-type cells while ciliates were dominated by a photosynthetic species, Mesodinium rubrum. In contrast to higher latitudes, increased snow cover appeared to favor the development of protozoa beneath the relatively thin 30–40 cm ice cover of Saroma-ko Lagoon. Temporally, a successional sequence was observed between protozoa and the bacterial compartment. Bacteria decreased in abundance throughout the sampling period while protozoa increased or attained their maximum number in late winter, toward the end of the sampling period. These observations support previous suggestions of the existence of a functional microbial food web within the sea-ice community. Heterotrophic flagellate biomass greatly exceeded bacterial biomass in the sea ice (30–60 x). Coupled with similar potential growth rates, this suggests the utilization of additional (non-bacterial) food items by ice-brine flagellates. 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Phone: 33 73 40 78 36. Fax: 33 73 40 76 70</p></note><affiliation>CNRS-URA 1944, Biologie Comparée des Protistes, Université Blaise Pascal (Clermont-Ferrand II), les Cézeaux, F-63177 Aubière, Cedex, France</affiliation></author><author xml:id="author-0001"><persName><forename type="first">S.Kim</forename><surname>Juniper</surname></persName><affiliation>GEOTOP and Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succ. “Centre-Ville”, Montréal, Qué. H3C 3P8, Canada</affiliation></author><author xml:id="author-0002"><persName><forename type="first">Serge</forename><surname>Demers</surname></persName><affiliation>INRS-Océanologie, 310 allée des Ursulines, Rimouski, Qué. G5L 3A1, Canada</affiliation></author><idno type="istex">0C92FF445F6D7EFF5F04ABB4E2DE630C50F14E94</idno><idno type="DOI">10.1016/S0924-7963(96)00035-8</idno><idno type="PII">S0924-7963(96)00035-8</idno></analytic><monogr><title level="j">Journal of Marine Systems</title><title level="j" type="abbrev">MARSYS</title><idno type="pISSN">0924-7963</idno><idno type="PII">S0924-7963(00)X0012-7</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997"></date><biblScope unit="volume">11</biblScope><biblScope unit="issue">1–2</biblScope><biblScope unit="page" from="149">149</biblScope><biblScope unit="page" to="161">161</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1997</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Biologists have rarely had the opportunity to investigate the community characteristics and dynamics of heterotrophic microorganisms in highly productive first-year sea ice. In this study, sterile seawater was used as a salinity buffer to extract the ice-brine microheterotroph communities (bacteria, flagellates and ciliates) from a coastal lagoon in Japan (Saroma-ko, Hokkaido; 44°N, 144°E) during the late winter (February—March) of 1992. This procedure reduced osmotic shock during the melting of ice cores and allowed the recovery of up to 323% more cells than the traditional melting method. Most of the organisms were concentrated in the bottom 3–4 cm of the ice, where abundances were up to 33 times higher than in the plankton. In ice and plankton samples, heterotrophic flagellates were dominated by small species (< 8 μm, mainly choanoflagellates) and cryothecomonad-type cells while ciliates were dominated by a photosynthetic species, Mesodinium rubrum. In contrast to higher latitudes, increased snow cover appeared to favor the development of protozoa beneath the relatively thin 30–40 cm ice cover of Saroma-ko Lagoon. Temporally, a successional sequence was observed between protozoa and the bacterial compartment. Bacteria decreased in abundance throughout the sampling period while protozoa increased or attained their maximum number in late winter, toward the end of the sampling period. These observations support previous suggestions of the existence of a functional microbial food web within the sea-ice community. Heterotrophic flagellate biomass greatly exceeded bacterial biomass in the sea ice (30–60 x). Coupled with similar potential growth rates, this suggests the utilization of additional (non-bacterial) food items by ice-brine flagellates. Finally, the effects of salinity variations (ranging between 15 and 120 psu) on potential microheterotroph growth rates are discussed.</p></abstract><textClass><keywords scheme="keyword"><list><head>Keywords</head><item><term>Arctic ice biota</term></item><item><term>salinity</term></item><item><term>bacteria</term></item><item><term>heterotrophic flagellates</term></item><item><term>ciliates</term></item><item><term>growth</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1997">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api-v5.istex.fr/document/0C92FF445F6D7EFF5F04ABB4E2DE630C50F14E94/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>MARSYS</jid><aid>96000358</aid><ce:pii>S0924-7963(96)00035-8</ce:pii><ce:doi>10.1016/S0924-7963(96)00035-8</ce:doi><ce:copyright type="unknown" year="1997"></ce:copyright></item-info><head><ce:title>Ice-brine and planktonic microheterotrophs from Saroma-ko Lagoon, Hokkaido (Japan): quantitative importance and trophodynamics</ce:title><ce:author-group><ce:author><ce:given-name>Télesphore</ce:given-name><ce:surname>Sime-Ngando</ce:surname><ce:cross-ref refid="COR1"><ce:sup>∗</ce:sup></ce:cross-ref><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref><ce:e-address>simengando@cicsun.univ-bpclermont.fr</ce:e-address></ce:author><ce:author><ce:given-name>S.Kim</ce:given-name><ce:surname>Juniper</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Serge</ce:given-name><ce:surname>Demers</ce:surname><ce:cross-ref refid="AFF3"><ce:sup>c</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>a</ce:label><ce:textfn>CNRS-URA 1944, Biologie Comparée des Protistes, Université Blaise Pascal (Clermont-Ferrand II), les Cézeaux, F-63177 Aubière, Cedex, France</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>b</ce:label><ce:textfn>GEOTOP and Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succ. “Centre-Ville”, Montréal, Qué. H3C 3P8, Canada</ce:textfn></ce:affiliation><ce:affiliation id="AFF3"><ce:label>c</ce:label><ce:textfn>INRS-Océanologie, 310 allée des Ursulines, Rimouski, Qué. G5L 3A1, Canada</ce:textfn></ce:affiliation><ce:correspondence id="COR1"><ce:label>∗</ce:label><ce:text>Corresponding author. Phone: 33 73 40 78 36. Fax: 33 73 40 76 70</ce:text></ce:correspondence></ce:author-group><ce:date-received day="11" month="8" year="1994"></ce:date-received><ce:date-accepted day="12" month="12" year="1994"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Biologists have rarely had the opportunity to investigate the community characteristics and dynamics of heterotrophic microorganisms in highly productive first-year sea ice. In this study, sterile seawater was used as a salinity buffer to extract the ice-brine microheterotroph communities (bacteria, flagellates and ciliates) from a coastal lagoon in Japan (Saroma-ko, Hokkaido; 44°N, 144°E) during the late winter (February—March) of 1992. This procedure reduced osmotic shock during the melting of ice cores and allowed the recovery of up to 323% more cells than the traditional melting method. Most of the organisms were concentrated in the bottom 3–4 cm of the ice, where abundances were up to 33 times higher than in the plankton. In ice and plankton samples, heterotrophic flagellates were dominated by small species (< 8 μm, mainly choanoflagellates) and cryothecomonad-type cells while ciliates were dominated by a photosynthetic species, <ce:italic>Mesodinium rubrum</ce:italic>. In contrast to higher latitudes, increased snow cover appeared to favor the development of protozoa beneath the relatively thin 30–40 cm ice cover of Saroma-ko Lagoon. Temporally, a successional sequence was observed between protozoa and the bacterial compartment. Bacteria decreased in abundance throughout the sampling period while protozoa increased or attained their maximum number in late winter, toward the end of the sampling period. These observations support previous suggestions of the existence of a functional microbial food web within the sea-ice community. Heterotrophic flagellate biomass greatly exceeded bacterial biomass in the sea ice (30–60 x). Coupled with similar potential growth rates, this suggests the utilization of additional (non-bacterial) food items by ice-brine flagellates. Finally, the effects of salinity variations (ranging between 15 and 120 psu) on potential microheterotroph growth rates are discussed.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:keywords><ce:section-title>Keywords</ce:section-title><ce:keyword><ce:text>Arctic ice biota</ce:text></ce:keyword><ce:keyword><ce:text>salinity</ce:text></ce:keyword><ce:keyword><ce:text>bacteria</ce:text></ce:keyword><ce:keyword><ce:text>heterotrophic flagellates</ce:text></ce:keyword><ce:keyword><ce:text>ciliates</ce:text></ce:keyword><ce:keyword><ce:text>growth</ce:text></ce:keyword></ce:keywords></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Ice-brine and planktonic microheterotrophs from Saroma-ko Lagoon, Hokkaido (Japan): quantitative importance and trophodynamics</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Ice-brine and planktonic microheterotrophs from Saroma-ko Lagoon, Hokkaido (Japan): quantitative importance and trophodynamics</title></titleInfo><name type="personal"><namePart type="given">Télesphore</namePart><namePart type="family">Sime-Ngando</namePart><affiliation>E-mail: simengando@cicsun.univ-bpclermont.fr</affiliation><affiliation>CNRS-URA 1944, Biologie Comparée des Protistes, Université Blaise Pascal (Clermont-Ferrand II), les Cézeaux, F-63177 Aubière, Cedex, France</affiliation><description>Corresponding author. Phone: 33 73 40 78 36. Fax: 33 73 40 76 70</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.Kim</namePart><namePart type="family">Juniper</namePart><affiliation>GEOTOP and Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succ. “Centre-Ville”, Montréal, Qué. H3C 3P8, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Serge</namePart><namePart type="family">Demers</namePart><affiliation>INRS-Océanologie, 310 allée des Ursulines, Rimouski, Qué. G5L 3A1, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1997</dateIssued><copyrightDate encoding="w3cdtf">1997</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Biologists have rarely had the opportunity to investigate the community characteristics and dynamics of heterotrophic microorganisms in highly productive first-year sea ice. In this study, sterile seawater was used as a salinity buffer to extract the ice-brine microheterotroph communities (bacteria, flagellates and ciliates) from a coastal lagoon in Japan (Saroma-ko, Hokkaido; 44°N, 144°E) during the late winter (February—March) of 1992. This procedure reduced osmotic shock during the melting of ice cores and allowed the recovery of up to 323% more cells than the traditional melting method. Most of the organisms were concentrated in the bottom 3–4 cm of the ice, where abundances were up to 33 times higher than in the plankton. In ice and plankton samples, heterotrophic flagellates were dominated by small species (< 8 μm, mainly choanoflagellates) and cryothecomonad-type cells while ciliates were dominated by a photosynthetic species, Mesodinium rubrum. In contrast to higher latitudes, increased snow cover appeared to favor the development of protozoa beneath the relatively thin 30–40 cm ice cover of Saroma-ko Lagoon. Temporally, a successional sequence was observed between protozoa and the bacterial compartment. Bacteria decreased in abundance throughout the sampling period while protozoa increased or attained their maximum number in late winter, toward the end of the sampling period. These observations support previous suggestions of the existence of a functional microbial food web within the sea-ice community. Heterotrophic flagellate biomass greatly exceeded bacterial biomass in the sea ice (30–60 x). Coupled with similar potential growth rates, this suggests the utilization of additional (non-bacterial) food items by ice-brine flagellates. Finally, the effects of salinity variations (ranging between 15 and 120 psu) on potential microheterotroph growth rates are discussed.</abstract><subject><genre>Keywords</genre><topic>Arctic ice biota</topic><topic>salinity</topic><topic>bacteria</topic><topic>heterotrophic flagellates</topic><topic>ciliates</topic><topic>growth</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Marine Systems</title></titleInfo><titleInfo type="abbreviated"><title>MARSYS</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199702</dateIssued></originInfo><identifier type="ISSN">0924-7963</identifier><identifier type="PII">S0924-7963(00)X0012-7</identifier><part><date>199702</date><detail type="issue"><title>Canada-Japan SARES Project on First-Year Sea Ice</title></detail><detail type="volume"><number>11</number><caption>vol.</caption></detail><detail type="issue"><number>1–2</number><caption>no.</caption></detail><extent unit="issue pages"><start>1</start><end>234</end></extent><extent unit="pages"><start>149</start><end>161</end></extent></part></relatedItem><identifier type="istex">0C92FF445F6D7EFF5F04ABB4E2DE630C50F14E94</identifier><identifier type="DOI">10.1016/S0924-7963(96)00035-8</identifier><identifier type="PII">S0924-7963(96)00035-8</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
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