Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994
Identifieur interne : 000094 ( Istex/Corpus ); précédent : 000093; suivant : 000095Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994
Auteurs : P. PorvariSource :
- Science of the Total Environment [ 0048-9697 ] ; 1998.
Abstract
Mercury (Hg) concentrations in burbot (Lota lota), perch (Perca fluviatilis), northern pike (Esox lucius), roach (Rutilus rutilus), whitefish (Coregonus lavaretus) and peled (C. peled) were monitored in 18 reservoirs situated in western and northern Finland over a period of 16 years (1979–1994). The reservoirs were impounded from 1964 to 1980. The surface areas ranged between 1 and 417 km2. Data from downstream sites and reference lakes were compared to reservoir mercury data. Generally, fish Hg concentrations in reservoirs exceeded those in natural lakes. Shortly after inundation, fish mercury concentrations clearly increased and remain 15–25 years above background concentrations. The mean Hg concentrations in standardized 1 kg pike from 1989 to 1993 was 0.45 mg/kg in natural lakes and 0.58 mg/kg in reservoirs. The 1 mg/kg fish Hg level recommended by health authorities as the upper limit for human consumption was still exceeded in two reservoirs 20 years old or more. The two largest reservoirs (24 and 27 years old in 1994) with significant commercial fishing had Hg levels below 0.5 mg/kg in all fish species studied. Statistical models for predicting the Hg concentrations in the weight standardized pike were verified with the observed data. For most of the reservoirs, predictions from models based on pH, organic matter (COD) in water, the extent of water level regulation and reservoir age agreed well with observed data. In the most southern, new (under 20 years old) and heavily regulated reservoirs, pike Hg concentration followed a logarithmic function of reservoir age. Model predictions of mercury in pike in the planned Vuotos reservoir (in northern Finland) predicted that Hg would exceed 1 mg/kg Hg for the first 12 years after the flooding.
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DOI: 10.1016/S0048-9697(98)00101-6
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Box 140, FIN-00251 Helsinki, Finland</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:99E0A1710B453F422573266908887341D86F3F62</idno><date when="1998" year="1998">1998</date><idno type="doi">10.1016/S0048-9697(98)00101-6</idno><idno type="url">https://api.istex.fr/document/99E0A1710B453F422573266908887341D86F3F62/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000094</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994</title><author><name sortKey="Porvari, P" sort="Porvari, P" uniqKey="Porvari P" first="P" last="Porvari">P. Porvari</name><affiliation><mods:affiliation>Finnish Environment Institute, Impacts Research Division, P.O. Box 140, FIN-00251 Helsinki, Finland</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Science of the Total Environment</title><title level="j" type="abbrev">STOTEN</title><idno type="ISSN">0048-9697</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1998">1998</date><biblScope unit="volume">213</biblScope><biblScope unit="issue">1–3</biblScope><biblScope unit="page" from="279">279</biblScope><biblScope unit="page" to="290">290</biblScope></imprint><idno type="ISSN">0048-9697</idno></series><idno type="istex">99E0A1710B453F422573266908887341D86F3F62</idno><idno type="DOI">10.1016/S0048-9697(98)00101-6</idno><idno type="PII">S0048-9697(98)00101-6</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0048-9697</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Mercury (Hg) concentrations in burbot (Lota lota), perch (Perca fluviatilis), northern pike (Esox lucius), roach (Rutilus rutilus), whitefish (Coregonus lavaretus) and peled (C. peled) were monitored in 18 reservoirs situated in western and northern Finland over a period of 16 years (1979–1994). The reservoirs were impounded from 1964 to 1980. The surface areas ranged between 1 and 417 km2. Data from downstream sites and reference lakes were compared to reservoir mercury data. Generally, fish Hg concentrations in reservoirs exceeded those in natural lakes. Shortly after inundation, fish mercury concentrations clearly increased and remain 15–25 years above background concentrations. The mean Hg concentrations in standardized 1 kg pike from 1989 to 1993 was 0.45 mg/kg in natural lakes and 0.58 mg/kg in reservoirs. The 1 mg/kg fish Hg level recommended by health authorities as the upper limit for human consumption was still exceeded in two reservoirs 20 years old or more. The two largest reservoirs (24 and 27 years old in 1994) with significant commercial fishing had Hg levels below 0.5 mg/kg in all fish species studied. Statistical models for predicting the Hg concentrations in the weight standardized pike were verified with the observed data. For most of the reservoirs, predictions from models based on pH, organic matter (COD) in water, the extent of water level regulation and reservoir age agreed well with observed data. In the most southern, new (under 20 years old) and heavily regulated reservoirs, pike Hg concentration followed a logarithmic function of reservoir age. Model predictions of mercury in pike in the planned Vuotos reservoir (in northern Finland) predicted that Hg would exceed 1 mg/kg Hg for the first 12 years after the flooding.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>P Porvari</name><affiliations><json:string>Finnish Environment Institute, Impacts Research Division, P.O. Box 140, FIN-00251 Helsinki, Finland</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>Mercury</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Methylmercury</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Accumulation</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Reservoir</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Fish</value></json:item></subject><language><json:string>eng</json:string></language><abstract>Mercury (Hg) concentrations in burbot (Lota lota), perch (Perca fluviatilis), northern pike (Esox lucius), roach (Rutilus rutilus), whitefish (Coregonus lavaretus) and peled (C. peled) were monitored in 18 reservoirs situated in western and northern Finland over a period of 16 years (1979–1994). The reservoirs were impounded from 1964 to 1980. The surface areas ranged between 1 and 417 km2. Data from downstream sites and reference lakes were compared to reservoir mercury data. Generally, fish Hg concentrations in reservoirs exceeded those in natural lakes. Shortly after inundation, fish mercury concentrations clearly increased and remain 15–25 years above background concentrations. The mean Hg concentrations in standardized 1 kg pike from 1989 to 1993 was 0.45 mg/kg in natural lakes and 0.58 mg/kg in reservoirs. The 1 mg/kg fish Hg level recommended by health authorities as the upper limit for human consumption was still exceeded in two reservoirs 20 years old or more. The two largest reservoirs (24 and 27 years old in 1994) with significant commercial fishing had Hg levels below 0.5 mg/kg in all fish species studied. Statistical models for predicting the Hg concentrations in the weight standardized pike were verified with the observed data. For most of the reservoirs, predictions from models based on pH, organic matter (COD) in water, the extent of water level regulation and reservoir age agreed well with observed data. In the most southern, new (under 20 years old) and heavily regulated reservoirs, pike Hg concentration followed a logarithmic function of reservoir age. Model predictions of mercury in pike in the planned Vuotos reservoir (in northern Finland) predicted that Hg would exceed 1 mg/kg Hg for the first 12 years after the flooding.</abstract><qualityIndicators><score>6.944</score><pdfVersion>1.2</pdfVersion><pdfPageSize>544 x 743 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>5</keywordCount><abstractCharCount>1773</abstractCharCount><pdfWordCount>3944</pdfWordCount><pdfCharCount>25566</pdfCharCount><pdfPageCount>12</pdfPageCount><abstractWordCount>277</abstractWordCount></qualityIndicators><title>Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994</title><pii><json:string>S0048-9697(98)00101-6</json:string></pii><genre><json:string>research-article</json:string></genre><host><volume>213</volume><pii><json:string>S0048-9697(00)X0092-7</json:string></pii><pages><last>290</last><first>279</first></pages><issn><json:string>0048-9697</json:string></issn><issue>1–3</issue><genre></genre><language><json:string>unknown</json:string></language><title>Science of the Total Environment</title><publicationDate>1998</publicationDate></host><categories><wos><json:string>ENVIRONMENTAL SCIENCES</json:string></wos></categories><publicationDate>1998</publicationDate><copyrightDate>1998</copyrightDate><doi><json:string>10.1016/S0048-9697(98)00101-6</json:string></doi><id>99E0A1710B453F422573266908887341D86F3F62</id><fulltext><json:item><original>true</original><mimetype>application/pdf</mimetype><extension>pdf</extension><uri>https://api.istex.fr/document/99E0A1710B453F422573266908887341D86F3F62/fulltext/pdf</uri></json:item><json:item><original>false</original><mimetype>application/zip</mimetype><extension>zip</extension><uri>https://api.istex.fr/document/99E0A1710B453F422573266908887341D86F3F62/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/99E0A1710B453F422573266908887341D86F3F62/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>Elsevier Science B.V., ©1998</p></availability><date>1998</date></publicationStmt><notesStmt><note type="content">Fig. 1: Location of the study reservoirs in Finland. The numbers in the map refer to Table 1.</note><note type="content">Fig. 2: The mercury concentrations of 1 kg pike (mg/kg wet wt.) as a function of COD (a), pH (b), the age of the reservoir (c) and the regulation intensity (d). Different symbols represent different reservoirs.</note><note type="content">Fig. 3: The observed and calculated mercury concentrations of 1 kg pike (mg/kg wet wt.) in reservoirs according to the COD-equation (a), pH-equation (b), the age of the reservoir (c) and RE-equation (d).</note><note type="content">Fig. 4: Development of mercury concentrations (mg/kg wet wt.) in 1 kg pike in Ostrobothnian reservoirs. Observed concentrations are shown as dots and predicted concentrations as lines. pH, Eq. (1); COD, Eq. (2); RE, Eq. (3); see text above. When all fish samples have been under 1 kg, the highest mercury concentration measured has been used (marked as open circles). The grey bar indicates the mercury levels (mean±S.D.) found in reference lakes.</note><note type="content">Fig. 5: Development of mercury concentrations (mg/kg wet wt.) in 0.5 kg burbot, 0.1 kg roach and perch in two southern Ostrobothnian reservoirs.</note><note type="content">Fig. 6: Development of mercury concentrations (mg/kg wet wt.) in 1 kg pike in the reservoirs of Lapland. Observed concentrations are shown as dots and predicted concentrations as lines. pH, Eq. (1); COD, Eq. (2); RE, Eq. (3). The grey bar indicates the mercury levels (mean±S.D.) found in reference lakes.</note><note type="content">Fig. 7: Development of mercury concentrations (mg/kg wet wt.) in 0.5 kg burbot and whitefish, 0.2 kg roach and perch in the reservoirs of Lapland. The observations in parenthesis are not reliable (see text for details).</note><note type="content">Fig. 8: Development of mercury concentrations (mg/kg wet wt.) in 1 kg pike for the planned Vuotos reservoir in Lapland. Predicted concentrations are shown as lines. The equations were based on (1) COD, Eq. (2); RE, Eq. (3); and AGE, reservoir age, equation based on data of southern Ostrobothnia.</note><note type="content">Table 1: General characteristics of the reservoirs (Verta et al., 1986; Puranen et al., 1996)</note><note type="content">Table 2: The mean mercury concentrations (mg/kg wet wt.) of standardized 1 kg pike and 0.1 kg perch in Finnish reservoirs</note><note type="content">Table 3: The 1989–1993 mercury concentrations of 1 kg pike (mg/kg wet wt.) in reservoirs and lakes in different areas and t-test to test the difference in mercury concentrations between reservoirs and natural lakes</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994</title><author><persName><forename type="first">P</forename><surname>Porvari</surname></persName><note type="biography">Tel.:+358 9 403000; fax: +358 9 40300390; e-mail: petri.porvari@vyh.fi</note><affiliation>Tel.:+358 9 403000; fax: +358 9 40300390; e-mail: petri.porvari@vyh.fi</affiliation><affiliation>Finnish Environment Institute, Impacts Research Division, P.O. Box 140, FIN-00251 Helsinki, Finland</affiliation></author></analytic><monogr><title level="j">Science of the Total Environment</title><title level="j" type="abbrev">STOTEN</title><idno type="pISSN">0048-9697</idno><idno type="PII">S0048-9697(00)X0092-7</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1998"></date><biblScope unit="volume">213</biblScope><biblScope unit="issue">1–3</biblScope><biblScope unit="page" from="279">279</biblScope><biblScope unit="page" to="290">290</biblScope></imprint></monogr><idno type="istex">99E0A1710B453F422573266908887341D86F3F62</idno><idno type="DOI">10.1016/S0048-9697(98)00101-6</idno><idno type="PII">S0048-9697(98)00101-6</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1998</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Mercury (Hg) concentrations in burbot (Lota lota), perch (Perca fluviatilis), northern pike (Esox lucius), roach (Rutilus rutilus), whitefish (Coregonus lavaretus) and peled (C. peled) were monitored in 18 reservoirs situated in western and northern Finland over a period of 16 years (1979–1994). The reservoirs were impounded from 1964 to 1980. The surface areas ranged between 1 and 417 km2. Data from downstream sites and reference lakes were compared to reservoir mercury data. Generally, fish Hg concentrations in reservoirs exceeded those in natural lakes. Shortly after inundation, fish mercury concentrations clearly increased and remain 15–25 years above background concentrations. The mean Hg concentrations in standardized 1 kg pike from 1989 to 1993 was 0.45 mg/kg in natural lakes and 0.58 mg/kg in reservoirs. The 1 mg/kg fish Hg level recommended by health authorities as the upper limit for human consumption was still exceeded in two reservoirs 20 years old or more. The two largest reservoirs (24 and 27 years old in 1994) with significant commercial fishing had Hg levels below 0.5 mg/kg in all fish species studied. Statistical models for predicting the Hg concentrations in the weight standardized pike were verified with the observed data. For most of the reservoirs, predictions from models based on pH, organic matter (COD) in water, the extent of water level regulation and reservoir age agreed well with observed data. In the most southern, new (under 20 years old) and heavily regulated reservoirs, pike Hg concentration followed a logarithmic function of reservoir age. Model predictions of mercury in pike in the planned Vuotos reservoir (in northern Finland) predicted that Hg would exceed 1 mg/kg Hg for the first 12 years after the flooding.</p></abstract><textClass><keywords scheme="keyword"><list><head>Keywords</head><item><term>Mercury</term></item><item><term>Methylmercury</term></item><item><term>Accumulation</term></item><item><term>Reservoir</term></item><item><term>Fish</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1998">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/99E0A1710B453F422573266908887341D86F3F62/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: ce:floats; body; 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:entity SYSTEM="gr1" NDATA="IMAGE" name="gr1"></istex:entity><istex:entity SYSTEM="gr2" NDATA="IMAGE" name="gr2"></istex:entity><istex:entity SYSTEM="gr3" NDATA="IMAGE" name="gr3"></istex:entity><istex:entity SYSTEM="gr4" NDATA="IMAGE" name="gr4"></istex:entity><istex:entity SYSTEM="gr5" NDATA="IMAGE" name="gr5"></istex:entity><istex:entity SYSTEM="gr6" NDATA="IMAGE" name="gr6"></istex:entity><istex:entity SYSTEM="gr7" NDATA="IMAGE" name="gr7"></istex:entity><istex:entity SYSTEM="gr8" NDATA="IMAGE" name="gr8"></istex:entity></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>STOTEN</jid><aid>5847</aid><ce:pii>S0048-9697(98)00101-6</ce:pii><ce:doi>10.1016/S0048-9697(98)00101-6</ce:doi><ce:copyright year="1998" type="full-transfer">Elsevier Science B.V.</ce:copyright></item-info><head><ce:title>Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994</ce:title><ce:author-group><ce:author><ce:given-name>P</ce:given-name><ce:surname>Porvari</ce:surname><ce:cross-ref refid="CORR1">*</ce:cross-ref></ce:author><ce:affiliation><ce:textfn>Finnish Environment Institute, Impacts Research Division, P.O. Box 140, FIN-00251 Helsinki, Finland</ce:textfn></ce:affiliation><ce:correspondence id="CORR1"><ce:label>*</ce:label><ce:text>Tel.:+358 9 403000; fax: +358 9 40300390; e-mail: petri.porvari@vyh.fi</ce:text></ce:correspondence></ce:author-group><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Mercury (Hg) concentrations in burbot (<ce:italic>Lota lota</ce:italic>), perch (<ce:italic>Perca fluviatilis</ce:italic>), northern pike (<ce:italic>Esox lucius</ce:italic>), roach (<ce:italic>Rutilus rutilus</ce:italic>), whitefish (<ce:italic>Coregonus lavaretus</ce:italic>) and peled (<ce:italic>C. peled</ce:italic>) were monitored in 18 reservoirs situated in western and northern Finland over a period of 16 years (1979–1994). The reservoirs were impounded from 1964 to 1980. The surface areas ranged between 1 and 417 km<ce:sup>2</ce:sup>. Data from downstream sites and reference lakes were compared to reservoir mercury data. Generally, fish Hg concentrations in reservoirs exceeded those in natural lakes. Shortly after inundation, fish mercury concentrations clearly increased and remain 15–25 years above background concentrations. The mean Hg concentrations in standardized 1 kg pike from 1989 to 1993 was 0.45 mg/kg in natural lakes and 0.58 mg/kg in reservoirs. The 1 mg/kg fish Hg level recommended by health authorities as the upper limit for human consumption was still exceeded in two reservoirs 20 years old or more. The two largest reservoirs (24 and 27 years old in 1994) with significant commercial fishing had Hg levels below 0.5 mg/kg in all fish species studied. Statistical models for predicting the Hg concentrations in the weight standardized pike were verified with the observed data. For most of the reservoirs, predictions from models based on pH, organic matter (COD) in water, the extent of water level regulation and reservoir age agreed well with observed data. In the most southern, new (under 20 years old) and heavily regulated reservoirs, pike Hg concentration followed a logarithmic function of reservoir age. Model predictions of mercury in pike in the planned Vuotos reservoir (in northern Finland) predicted that Hg would exceed 1 mg/kg Hg for the first 12 years after the flooding.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:keywords class="keyword"><ce:section-title>Keywords</ce:section-title><ce:keyword><ce:text>Mercury</ce:text></ce:keyword><ce:keyword><ce:text>Methylmercury</ce:text></ce:keyword><ce:keyword><ce:text>Accumulation</ce:text></ce:keyword><ce:keyword><ce:text>Reservoir</ce:text></ce:keyword><ce:keyword><ce:text>Fish</ce:text></ce:keyword></ce:keywords></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Development of fish mercury concentrations in Finnish reservoirs from 1979 to 1994</title></titleInfo><name type="personal"><namePart type="given">P</namePart><namePart type="family">Porvari</namePart><affiliation>Finnish Environment Institute, Impacts Research Division, P.O. Box 140, FIN-00251 Helsinki, Finland</affiliation><description>Tel.:+358 9 403000; fax: +358 9 40300390; e-mail: petri.porvari@vyh.fi</description><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article">Full-length article</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1998</dateIssued><copyrightDate encoding="w3cdtf">1998</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">Mercury (Hg) concentrations in burbot (Lota lota), perch (Perca fluviatilis), northern pike (Esox lucius), roach (Rutilus rutilus), whitefish (Coregonus lavaretus) and peled (C. peled) were monitored in 18 reservoirs situated in western and northern Finland over a period of 16 years (1979–1994). The reservoirs were impounded from 1964 to 1980. The surface areas ranged between 1 and 417 km2. Data from downstream sites and reference lakes were compared to reservoir mercury data. Generally, fish Hg concentrations in reservoirs exceeded those in natural lakes. Shortly after inundation, fish mercury concentrations clearly increased and remain 15–25 years above background concentrations. The mean Hg concentrations in standardized 1 kg pike from 1989 to 1993 was 0.45 mg/kg in natural lakes and 0.58 mg/kg in reservoirs. The 1 mg/kg fish Hg level recommended by health authorities as the upper limit for human consumption was still exceeded in two reservoirs 20 years old or more. The two largest reservoirs (24 and 27 years old in 1994) with significant commercial fishing had Hg levels below 0.5 mg/kg in all fish species studied. Statistical models for predicting the Hg concentrations in the weight standardized pike were verified with the observed data. For most of the reservoirs, predictions from models based on pH, organic matter (COD) in water, the extent of water level regulation and reservoir age agreed well with observed data. In the most southern, new (under 20 years old) and heavily regulated reservoirs, pike Hg concentration followed a logarithmic function of reservoir age. Model predictions of mercury in pike in the planned Vuotos reservoir (in northern Finland) predicted that Hg would exceed 1 mg/kg Hg for the first 12 years after the flooding.</abstract><note type="content">Fig. 1: Location of the study reservoirs in Finland. The numbers in the map refer to Table 1.</note><note type="content">Fig. 2: The mercury concentrations of 1 kg pike (mg/kg wet wt.) as a function of COD (a), pH (b), the age of the reservoir (c) and the regulation intensity (d). Different symbols represent different reservoirs.</note><note type="content">Fig. 3: The observed and calculated mercury concentrations of 1 kg pike (mg/kg wet wt.) in reservoirs according to the COD-equation (a), pH-equation (b), the age of the reservoir (c) and RE-equation (d).</note><note type="content">Fig. 4: Development of mercury concentrations (mg/kg wet wt.) in 1 kg pike in Ostrobothnian reservoirs. Observed concentrations are shown as dots and predicted concentrations as lines. pH, Eq. (1); COD, Eq. (2); RE, Eq. (3); see text above. When all fish samples have been under 1 kg, the highest mercury concentration measured has been used (marked as open circles). The grey bar indicates the mercury levels (mean±S.D.) found in reference lakes.</note><note type="content">Fig. 5: Development of mercury concentrations (mg/kg wet wt.) in 0.5 kg burbot, 0.1 kg roach and perch in two southern Ostrobothnian reservoirs.</note><note type="content">Fig. 6: Development of mercury concentrations (mg/kg wet wt.) in 1 kg pike in the reservoirs of Lapland. Observed concentrations are shown as dots and predicted concentrations as lines. pH, Eq. (1); COD, Eq. (2); RE, Eq. (3). The grey bar indicates the mercury levels (mean±S.D.) found in reference lakes.</note><note type="content">Fig. 7: Development of mercury concentrations (mg/kg wet wt.) in 0.5 kg burbot and whitefish, 0.2 kg roach and perch in the reservoirs of Lapland. The observations in parenthesis are not reliable (see text for details).</note><note type="content">Fig. 8: Development of mercury concentrations (mg/kg wet wt.) in 1 kg pike for the planned Vuotos reservoir in Lapland. Predicted concentrations are shown as lines. The equations were based on (1) COD, Eq. (2); RE, Eq. (3); and AGE, reservoir age, equation based on data of southern Ostrobothnia.</note><note type="content">Table 1: General characteristics of the reservoirs (Verta et al., 1986; Puranen et al., 1996)</note><note type="content">Table 2: The mean mercury concentrations (mg/kg wet wt.) of standardized 1 kg pike and 0.1 kg perch in Finnish reservoirs</note><note type="content">Table 3: The 1989–1993 mercury concentrations of 1 kg pike (mg/kg wet wt.) in reservoirs and lakes in different areas and t-test to test the difference in mercury concentrations between reservoirs and natural lakes</note><subject><genre>Keywords</genre><topic>Mercury</topic><topic>Methylmercury</topic><topic>Accumulation</topic><topic>Reservoir</topic><topic>Fish</topic></subject><relatedItem type="host"><titleInfo><title>Science of the Total Environment</title></titleInfo><titleInfo type="abbreviated"><title>STOTEN</title></titleInfo><originInfo><dateIssued encoding="w3cdtf">19980610</dateIssued></originInfo><identifier type="ISSN">0048-9697</identifier><identifier type="PII">S0048-9697(00)X0092-7</identifier><part><date>19980610</date><detail type="volume"><number>213</number><caption>vol.</caption></detail><detail type="issue"><number>1–3</number><caption>no.</caption></detail><extent unit="issue pages"><start>1</start><end>324</end></extent><extent unit="pages"><start>279</start><end>290</end></extent></part></relatedItem><identifier type="istex">99E0A1710B453F422573266908887341D86F3F62</identifier><identifier type="DOI">10.1016/S0048-9697(98)00101-6</identifier><identifier type="PII">S0048-9697(98)00101-6</identifier><recordInfo><recordOrigin>ELSEVIER</recordOrigin><recordContentSource>Elsevier Science B.V., ©1998</recordContentSource></recordInfo></mods></metadata><enrichments><istex:catWosTEI uri="https://api.istex.fr/document/99E0A1710B453F422573266908887341D86F3F62/enrichments/catWos"><teiHeader><profileDesc><textClass><classCode scheme="WOS">ENVIRONMENTAL SCIENCES</classCode></textClass></profileDesc></teiHeader></istex:catWosTEI></enrichments><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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