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<mods:title id="8A285ED8F7105176E4E7175A6B5563D3">Germanium dioxide as agent to control the biofouling diatom Fragilariopsis oceanica for the cultivation of Ulva fenestrata (Chlorophyta)</mods:title>
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<taxonomicName id="4C6A5ECCFFD3FFBEF454F952FB3BF95D" authority="(Cleve) Hasle, 1965" box="[878,1177,1707,1736]" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="3" pageNumber="96" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD3FFBEF454F952FB3BF95D" bold="true" box="[878,1177,1707,1736]" italics="true" pageId="3" pageNumber="96">Fragilariopsis oceanica</emphasis>
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is widely used as an effective growth inhibitor for diatoms and other silicifying microalgae (e.g. chrysophytes). It competitively inhibits the uptake of Si through Si-transporters (SITs), which eventually interrupts cell wall formation in the algae (
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%
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<paragraph id="8BD5254FFFD4FFB9F56DFEE7FDCBFEDC" blockId="4.[139,1421,191,831]" box="[599,617,286,329]" pageId="4" pageNumber="97">μmol</paragraph>
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5
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electrons 0.1
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0
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<emphasis id="B91EF95DFFD4FFB9F4CFFE37FBE6FE74" bold="true" box="[1013,1092,462,481]" pageId="4" pageNumber="97">Figure 4:</emphasis>
Physiological parameters of the large-scale cultivation of
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with GeO
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.
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) 300 (
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) Relative growth rates (
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(
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) photosynthetic electron transport
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mmefficiencies (
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<paragraph id="8BD5254FFFD4FFB9F798FDA4FDCBFD09" blockId="4.[139,1421,191,831]" box="[162,617,598,685]" pageId="4" pageNumber="97">electrons 40 60 photons</paragraph>
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points
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<paragraph id="8BD5254FFFD4FFB9F342FD63FB71FD38" blockId="4.[139,1421,191,831]" box="[1144,1235,666,685]" pageId="4" pageNumber="97">large-scale</paragraph>
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(
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), of (
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photosynthesis) maximum) and
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(D) electron light (
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<paragraph id="8BD5254FFFD4FFB9F26BFD63FADBFD38" blockId="4.[139,1421,191,831]" box="[1361,1401,666,685]" pageId="4" pageNumber="97">days</paragraph>
<paragraph id="8BD5254FFFD4FFB9F260FD84FADFFD05" blockId="4.[139,1421,191,831]" box="[1370,1405,637,656]" pageId="4" pageNumber="97">
<taxonomicName id="4C6A5ECCFFD4FFB9F260FD84FADFFD05" box="[1370,1405,637,656]" class="Ulvophyceae" family="Ulvaceae" genus="Ulva" kingdom="Plantae" order="Ulvales" pageId="4" pageNumber="97" phylum="Chlorophyta" rank="genus">
<emphasis id="B91EF95DFFD4FFB9F260FD84FADFFD05" box="[1370,1405,637,656]" italics="true" pageId="4" pageNumber="97">Ulva</emphasis>
</taxonomicName>
</paragraph>
<paragraph id="8BD5254FFFD4FFB9F243FD63FF16FD4A" blockId="4.[139,1421,191,831]" pageId="4" pageNumber="97">) μmol</paragraph>
<paragraph id="8BD5254FFFD4FFB9F798FD26FF16FD71" blockId="4.[139,1421,191,831]" box="[162,180,735,740]" pageId="4" pageNumber="97">(</paragraph>
<paragraph id="8BD5254FFFD4FFB9F7F8FD42FF7AFD58" blockId="4.[139,1421,191,831]" box="[194,216,699,717]" pageId="4" pageNumber="97">20</paragraph>
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(
</emphasis>
</paragraph>
<paragraph id="8BD5254FFFD4FFB9F56DFD58FDCBFD5B" blockId="4.[139,1421,191,831]" box="[599,617,673,718]" pageId="4" pageNumber="97">μmol</paragraph>
<paragraph id="8BD5254FFFD4FFB9F55EFD21FDCDFD4B" blockId="4.[139,1421,191,831]" box="[612,623,728,734]" pageId="4" pageNumber="97">
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<superScript id="7C1F8807FFD4FFB9F55EFD21FDCDFD4B" attach="left" box="[612,623,728,734]" fontSize="4" pageId="4" pageNumber="97">k</superScript>
</subScript>
</paragraph>
<paragraph id="8BD5254FFFD4FFB9F544FD3BFD36FD41" blockId="4.[139,1421,191,831]" box="[638,660,706,724]" pageId="4" pageNumber="97">50</paragraph>
<paragraph id="8BD5254FFFD4FFB9F5B3FD23FD36FD79" blockId="4.[139,1421,191,831]" box="[649,660,730,748]" pageId="4" pageNumber="97">0</paragraph>
<paragraph id="8BD5254FFFD4FFB9F4CFFD41FADFFD58" blockId="4.[139,1421,191,831]" box="[1013,1405,696,744]" pageId="4" pageNumber="97">
in concentrations 100-l Plexiglass at 140 water µmol tanks photons with three m
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s GeO
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</paragraph>
<paragraph id="8BD5254FFFD4FFB9F7F7FD11FF7AFD6F" blockId="4.[139,1421,191,831]" box="[205,216,744,762]" pageId="4" pageNumber="97">0</paragraph>
<paragraph id="8BD5254FFFD4FFB9F4CFFD0BFAD4FC90" blockId="4.[139,1421,191,831]" box="[1013,1398,754,773]" pageId="4" pageNumber="97">
and 12 °
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. Data are means of three replicates
</paragraph>
<paragraph id="8BD5254FFFD4FFB9F627FD07FC19FC85" blockId="4.[139,1421,191,831]" box="[285,955,766,784]" pageId="4" pageNumber="97">
0
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0
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<geoCoordinate id="EE5E4388FFD4FFB9F4B0FD07FC19FC85" box="[906,955,766,784]" degrees="2.235" direction="east" orientation="longitude" pageId="4" pageNumber="97" precision="55" value="2.235">2.235</geoCoordinate>
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per treatment (
<emphasis id="B91EF95DFFD4FFB9F34DFCF6FB23FCB7" box="[1143,1153,783,802]" italics="true" pageId="4" pageNumber="97">n</emphasis>
= 3) and error bars represent
</paragraph>
<paragraph id="8BD5254FFFD4FFB9F633FCD9FB06FCAA" blockId="4.[139,1421,191,831]" box="[265,1188,799,831]" pageId="4" pageNumber="97">
GeO
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concentration (mg L
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) GeO
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concentration (mg L
<superScript id="7C1F8807FFD4FFB9F48BFCE6FC17FCBF" attach="right" box="[945,949,799,810]" fontSize="4" pageId="4" pageNumber="97">1</superScript>
) standard deviations.
</paragraph>
<paragraph id="8BD5254FFFD4FFB9F678FAF3FEEBFA81" box="[322,329,1290,1300]" pageId="4" pageNumber="97">2</paragraph>
<caption id="DF1575C7FFD4FFB9F7B2FAC6FDDFFA71" ID-DOI="http://doi.org/10.5281/zenodo.11360462" ID-Zenodo-Dep="11360462" httpUri="https://zenodo.org/record/11360462/files/figure.png" pageId="4" pageNumber="97" startId="4.[136,194,1343,1362]" targetBox="[145,589,890,1295]" targetPageId="4" targetType="figure">
<paragraph id="8BD5254FFFD4FFB9F7B2FAC6FDDFFA71" blockId="4.[136,747,1343,1508]" pageId="4" pageNumber="97">
<emphasis id="B91EF95DFFD4FFB9F7B2FAC6FF7AFAC7" bold="true" box="[136,216,1343,1362]" pageId="4" pageNumber="97">Figure 5:</emphasis>
GeO
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-dependent total diatom density present on the surfaces of Plexiglass water tanks after 14 days of large-scale cultivation of
<taxonomicName id="4C6A5ECCFFD4FFB9F586FAA5FF7BFA19" class="Ulvophyceae" family="Ulvaceae" genus="Ulva" kingdom="Plantae" order="Ulvales" pageId="4" pageNumber="97" phylum="Chlorophyta" rank="species" species="fenestrata">
<emphasis id="B91EF95DFFD4FFB9F586FAA5FF7BFA19" italics="true" pageId="4" pageNumber="97">Ulva fenestrata</emphasis>
</taxonomicName>
. Data are means of three replicates per treatment (
<emphasis id="B91EF95DFFD4FFB9F5A9FA80FD3FFA19" box="[659,669,1401,1420]" italics="true" pageId="4" pageNumber="97">n</emphasis>
= 3) and error bars represent standard deviations. Lowercase letters above columns indicate statistically significant differences between the treatments (
<emphasis id="B91EF95DFFD4FFB9F7B4FA28FF3AFA71" box="[142,152,1489,1508]" italics="true" pageId="4" pageNumber="97">P</emphasis>
&lt;0.001, 1-way ANOVA, Tukey-Kramer HSD
<emphasis id="B91EF95DFFD4FFB9F53DFA28FDEEFA71" box="[519,588,1489,1508]" italics="true" pageId="4" pageNumber="97">post-hoc</emphasis>
test).
</paragraph>
</caption>
<paragraph id="8BD5254FFFD4FFB9F7B2F9DCFAC5FB2B" blockId="4.[136,764,1573,1942]" lastBlockId="4.[794,1422,881,1939]" pageId="4" pageNumber="97">
Toxicological studies have shown species- and strain-specific responses of diatoms to GeO
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. While concentrations of up to
<quantity id="4C9288AAFFD4FFB9F7B2F993FF1AF9EA" box="[136,184,1642,1663]" metricMagnitude="-6" metricUnit="kg" metricValue="1.0" pageId="4" pageNumber="97" unit="mg" value="1.0">1 mg</quantity>
GeO
<subScript id="17EE270AFFD4FFB9F7D3F98AFF53F917" attach="left" box="[233,241,1651,1666]" fontSize="6" pageId="4" pageNumber="97">2</subScript>
l
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inhibited the growth of highly silicified diatom species (e.g.
<taxonomicName id="4C6A5ECCFFD4FFB9F61BF975FDB7F934" authorityName="W.Smith" authorityYear="1853" box="[289,533,1676,1697]" class="Anthozoa" family="Astrocoeniidae" genus="Amphiphora" higherTaxonomySource="GBIF" kingdom="Animalia" order="Scleractinia" pageId="4" pageNumber="97" phylum="Cnidaria" rank="species" species="paludosa">
<emphasis id="B91EF95DFFD4FFB9F61BF975FDB7F934" box="[289,533,1676,1697]" italics="true" pageId="4" pageNumber="97">Amphiphora paludosa</emphasis>
</taxonomicName>
,
<taxonomicName id="4C6A5ECCFFD4FFB9F516F975FF69F951" authorityName="Reimann &amp; J.C.Lewin" authorityYear="1964" class="Sordariomycetes" family="Valsaceae" genus="Cylindrotheca" kingdom="Fungi" order="Diaporthales" pageId="4" pageNumber="97" phylum="Ascomycota" rank="species" species="fusiformis">
<emphasis id="B91EF95DFFD4FFB9F516F975FF69F951" italics="true" pageId="4" pageNumber="97">Cylindrotheca fusiformis</emphasis>
</taxonomicName>
), diatoms with a low degree of silicified cell walls (e.g.
<taxonomicName id="4C6A5ECCFFD4FFB9F7B2F928FE19F972" authorityName="Bohlin" authorityYear="1897" box="[136,443,1745,1767]" class="Bacillariophyceae" family="Phaeodactylaceae" genus="Phaeodactylum" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="tricornutum">
<emphasis id="B91EF95DFFD4FFB9F7B2F928FE19F972" box="[136,443,1745,1767]" italics="true" pageId="4" pageNumber="97">Phaeodactylum tricornutum</emphasis>
</taxonomicName>
) were insensitive even to 10 GeO
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mg
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l
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(
<bibRefCitation id="EFFB58BEFFD4FFB9F610F90DFE05F89F" author="Lewin, J." box="[298,423,1780,1802]" pageId="4" pageNumber="97" pagination="1 - 12" refId="ref7848" refString="Lewin, J. (1966). Silicon metabolism in diatoms. V. Germanium dioxide, a specific inhibitor of diatom growth. Phycologia 6: 1 - 12." type="journal article" year="1966">Lewin 1966</bibRefCitation>
;
<bibRefCitation id="EFFB58BEFFD4FFB9F68EF90DFD5AF89C" author="Markham, J. W. &amp; Hagmeier, E." box="[436,760,1780,1802]" pageId="4" pageNumber="97" refId="ref8098" refString="Markham, J. W. and Hagmeier, E. (1982). Observations on the effects of germanium dioxide on the growth of macro-algae and diatoms." type="book" year="1982">Markham and Hagmeier 1982</bibRefCitation>
;
<bibRefCitation id="EFFB58BEFFD4FFB9F7B2F8EFFE1CF8B8" author="Tatewaki, M. &amp; Mizuno, M." box="[136,446,1814,1837]" pageId="4" pageNumber="97" pagination="205 - 212" refId="ref8594" refString="Tatewaki, M. and Mizuno, M. (1979). Growth inhibition by germanium dioxide in various algae, especially in brown algae. Jpn. J. Phycol. 27: 205 - 212." type="journal article" year="1979">Tatewaki and Mizuno 1979</bibRefCitation>
). By using these results as benchmark for the present study,
<taxonomicName id="4C6A5ECCFFD4FFB9F6C6F8C3FDD1F8DA" box="[508,627,1850,1871]" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD4FFB9F6C6F8C3FDD1F8DA" box="[508,627,1850,1871]" italics="true" pageId="4" pageNumber="97">F. oceanica</emphasis>
</taxonomicName>
seems to be highly sensitive to GeO
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because its growth was inhibited at a low concentration of
<quantity id="4C9288AAFFD4FFB9F646F887FE75F806" box="[380,471,1918,1939]" metricMagnitude="-8" metricUnit="kg" metricValue="1.4" pageId="4" pageNumber="97" unit="mg" value="0.014">0.014 mg</quantity>
GeO
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l
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. Assuming that Si uptake in
<taxonomicName id="4C6A5ECCFFD4FFB9F4BCFC8BFC59FC12" box="[902,1019,882,903]" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD4FFB9F4BCFC8BFC59FC12" box="[902,1019,882,903]" italics="true" pageId="4" pageNumber="97">F. oceanica</emphasis>
</taxonomicName>
is mediated by SITs at low Si concentrations in seawater (&lt;30 µM) as shown for
<taxonomicName id="4C6A5ECCFFD4FFB9F23BFC6DFA84FC59" authority="(Thamatrakoln and Hildebrand 2008)" baseAuthorityName="Thamatrakoln and Hildebrand" baseAuthorityYear="2008" class="Bacillariophyceae" family="Thalassiosiraceae" genus="Thalassiosira" higherTaxonomySource="GBIF" kingdom="Chromista" order="Thalassiosirales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="pseudonana">
<emphasis id="B91EF95DFFD4FFB9F23BFC6DFC35FC5E" italics="true" pageId="4" pageNumber="97">Thalassiosira pseudonana</emphasis>
(
<bibRefCitation id="EFFB58BEFFD4FFB9F49EFC4FFABDFC59" author="Thamatrakoln, K. &amp; Hildebrand, M." box="[932,1311,950,972]" pageId="4" pageNumber="97" pagination="1397 - 1407" refId="ref8633" refString="Thamatrakoln, K. and Hildebrand, M. (2008). Silicon uptake in diatoms revisited: a model for saturable and nonsaturable uptake kinetics and the role of silicon transporters. Plant Physiol. 146: 1397 - 1407." type="journal article" year="2008">Thamatrakoln and Hildebrand 2008</bibRefCitation>
)
</taxonomicName>
, a growth inhibition by GeO
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could have been expected because the seawater Si concentration used was approx. 2.1 µM (
<bibRefCitation id="EFFB58BEFFD4FFB9F277FC02FC28FBA1" author="Busch, K. &amp; Iversen, K. &amp; Nashoug, B. &amp; Kiele, M. &amp; Gitmark, J. &amp; Remen, V. &amp; Velvin, R. &amp; Krogstad, M." pageId="4" pageNumber="97" refId="ref6688" refString="Busch, K., Iversen, K., Nashoug, B., Kiele, M., Gitmark, J., Remen, V., Velvin, R., and Krogstad, M. (2014). MiljOundersOkelse av Skjerstadfjorden. Report 1006, Salt Lofoten AS, Svolvaer." type="book" year="2014">Busch et al. 2014</bibRefCitation>
). However, if Si was added to the seawater according to formulation of the
<collectionCode id="ED7BBD8AFFD4FFB9F358FBB9FB01FBC0" box="[1122,1187,1088,1109]" pageId="4" pageNumber="97">ESNW</collectionCode>
medium with a final concentration of 106 µM, a different result would have been observed because diffusive Si uptake predominates at higher Si concentrations (
<bibRefCitation id="EFFB58BEFFD4FFB9F4E4FB51FAFEFB2B" author="Thamatrakoln, K. &amp; Hildebrand, M." box="[990,1372,1192,1214]" pageId="4" pageNumber="97" pagination="1397 - 1407" refId="ref8633" refString="Thamatrakoln, K. and Hildebrand, M. (2008). Silicon uptake in diatoms revisited: a model for saturable and nonsaturable uptake kinetics and the role of silicon transporters. Plant Physiol. 146: 1397 - 1407." type="journal article" year="2008">Thamatrakoln and Hildebrand 2008</bibRefCitation>
).
</paragraph>
<paragraph id="8BD5254FFFD4FFB8F47DFB33FDEDFE16" blockId="4.[794,1422,881,1939]" lastBlockId="5.[166,794,193,389]" lastPageId="5" lastPageNumber="98" pageId="4" pageNumber="97">
Interestingly, the use of GeO
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in
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the glass beakers and Plexiglass water tanks showed different effects on
<taxonomicName id="4C6A5ECCFFD4FFB9F272FB17FCF6FAB0" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD4FFB9F272FB17FCF6FAB0" italics="true" pageId="4" pageNumber="97">F. oceanica</emphasis>
</taxonomicName>
. While low GeO
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concentration inhibited the growth of
<taxonomicName id="4C6A5ECCFFD4FFB9F402FACAFC13FADD" box="[824,945,1331,1352]" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD4FFB9F402FACAFC13FADD" box="[824,945,1331,1352]" italics="true" pageId="4" pageNumber="97">F. oceanica</emphasis>
</taxonomicName>
, the colonisation of the Plexiglass walls by
<taxonomicName id="4C6A5ECCFFD4FFB9F420FAACFC32FAFF" box="[794,912,1365,1386]" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD4FFB9F420FAACFC32FAFF" box="[794,912,1365,1386]" italics="true" pageId="4" pageNumber="97">F. oceanica</emphasis>
</taxonomicName>
could not be fully prevented even by the use of
<quantity id="4C9288AAFFD4FFB9F420FA8FFCD1FA18" box="[794,883,1398,1421]" metricMagnitude="-6" metricUnit="kg" metricValue="2.235" pageId="4" pageNumber="97" unit="mg" value="2.235">2.235 mg</quantity>
GeO
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l
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. This could be possibly ascribed to the different physical surface properties between glass and Plexiglass. Insoluble extracellular polymeric substances (
<collectionCode id="ED7BBD8AFFD4FFB9F41AFA26FCE8FA60" box="[800,842,1503,1525]" pageId="4" pageNumber="97">EPS</collectionCode>
) secreted by diatoms allow them to adsorb better on hydrophobic surfaces such as Plexiglass than on the hydrophilic surfaces of the glass beakers (
<bibRefCitation id="EFFB58BEFFD4FFB9F3F5F9DDFA2BF9AC" author="Finlay, J. A. &amp; Schultz, M. P. &amp; Cone, G. &amp; Callow, M. E. &amp; Callow, J. A." box="[1231,1417,1572,1594]" pageId="4" pageNumber="97" refId="ref7249" refString="Finlay, J. A., Schultz, M. P., Cone, G., Callow, M. E., and Callow, J. A. (2013)." type="book" year="2013">Finlay et al. 2013</bibRefCitation>
;
<bibRefCitation id="EFFB58BEFFD4FFB9F420F9BFFC54F9C9" author="Holland, R. &amp; Dugdale, T. M. &amp; Wetherbee, R. &amp; Brennan, A. B. &amp; Finlay, J. A. &amp; Callow, J. A. &amp; Callow, M. E." box="[794,1014,1606,1628]" pageId="4" pageNumber="97" pagination="323 - 329" refId="ref7476" refString="Holland, R., Dugdale, T. M., Wetherbee, R., Brennan, A. B., Finlay, J. A., Callow, J. A., and Callow, M. E. (2004). Adhesion and motility of fouling diatoms on a silicone elastomer. Biofouling 20: 323 - 329." type="journal article" year="2004">
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et al. 2004
</bibRefCitation>
;
<bibRefCitation id="EFFB58BEFFD4FFB9F332F9BFFB50F9C9" author="Krishnan, S. &amp; Wang, N. &amp; Ober, C. K. &amp; Finlay, J. A. &amp; Callow, M. E. &amp; Callow, J. A. &amp; Hexemer, A. &amp; Sohn, K. E. &amp; Kramer, E. J. &amp; Fischer, D. A." box="[1032,1266,1606,1628]" pageId="4" pageNumber="97" refId="ref7745" refString="Krishnan, S., Wang, N., Ober, C. K., Finlay, J. A., Callow, M. E., Callow, J. A., Hexemer, A., Sohn, K. E., Kramer, E. J., and Fischer, D. A. (2006)." type="book" year="2006">Krishnan et al. 2006</bibRefCitation>
; reviewed by
<bibRefCitation id="EFFB58BEFFD4FFB9F420F990FBE2F9EA" author="Thompson, S. E. M. &amp; Coates, J. C." box="[794,1088,1641,1663]" pageId="4" pageNumber="97" pagination="410 - 432" refId="ref8676" refString="Thompson, S. E. M. and Coates, J. C. (2017). Surface sensing and stresssignalling in Ulva and fouling diatoms - potential targets for antifouling: a review. Biofouling 33: 410 - 432." type="journal article" year="2017">Thompson and Coates 2017</bibRefCitation>
). In addition, EPS-rich biofilms from
<taxonomicName id="4C6A5ECCFFD4FFB9F462F972FC74F935" authorityName="Shiba" authorityYear="1991" box="[856,982,1675,1696]" class="Alphaproteobacteria" family="Rhodobacteraceae" genus="Roseobacter" kingdom="Bacteria" order="Rhodobacterales" pageId="4" pageNumber="97" phylum="Proteobacteria" rank="genus">
<emphasis id="B91EF95DFFD4FFB9F462F972FC74F935" box="[856,982,1675,1696]" italics="true" pageId="4" pageNumber="97">Roseobacter</emphasis>
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and
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<emphasis id="B91EF95DFFD4FFB9F31AF972FB3AF935" box="[1056,1176,1675,1698]" italics="true" pageId="4" pageNumber="97">
ul
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tobacter
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, which are associated with
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<emphasis id="B91EF95DFFD4FFB9F469F957FC20F956" box="[851,898,1710,1731]" italics="true" pageId="4" pageNumber="97">Ulva</emphasis>
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, could have enhanced the attachment of
<taxonomicName id="4C6A5ECCFFD4FFB9F272F956FCF1F973" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD4FFB9F272F956FCF1F973" italics="true" pageId="4" pageNumber="97">F. oceanica</emphasis>
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on the Plexiglass walls (
<bibRefCitation id="EFFB58BEFFD4FFB9F374F928FABEF973" author="Bruckner, C. G. &amp; Rehm, C. &amp; Grossart, H. - P. &amp; Kroth, P. G." box="[1102,1308,1745,1767]" pageId="4" pageNumber="97" pagination="1052 - 1063" refId="ref6574" refString="Bruckner, C. G., Rehm, C., Grossart, H. - P., and Kroth, P. G. (2011). Growth and release of extracellular organic compounds by benthic diatoms depend on interactions with bacteria. Environ. Microbiol. 13: 1052 - 1063." type="journal article" year="2011">Bruckner et al. 2011</bibRefCitation>
;
<bibRefCitation id="EFFB58BEFFD4FFB9F21FF928FC21F89C" author="Buhmann, M. T. &amp; Schulze, B. &amp; FOrderer, A. &amp; Schleheck, D. &amp; Kroth, P. G." pageId="4" pageNumber="97" pagination="463 - 474" refId="ref6631" refString="Buhmann, M. T., Schulze, B., FOrderer, A., Schleheck, D., and Kroth, P. G. (2016). Bacteria may induce the secretion of mucin-like proteins by the diatom Phaeodactylum tricornutum. J. Phycol. 52: 463 - 474." type="journal article" year="2016">Buhmann et al. 2016</bibRefCitation>
;
<bibRefCitation id="EFFB58BEFFD4FFB9F4B7F90AFBFCF89C" author="Spoerner, M. &amp; Wichard, T. &amp; Bachhuber, T. &amp; Stratmann, J. &amp; Oertel, W." box="[909,1118,1779,1801]" pageId="4" pageNumber="97" pagination="1433 - 1447" refId="ref8492" refString="Spoerner, M., Wichard, T., Bachhuber, T., Stratmann, J., and Oertel, W. (2012). Growth and thallus morphogenesis of Ulva mutabilis (Chlorophyta) depends on a combination of two bacterial species excreting regulatory factors. J. Phycol. 48: 1433 - 1447." type="journal article" year="2012">Spoerner et al. 2012</bibRefCitation>
). Thus, the bacterial biofilms could help
<taxonomicName id="4C6A5ECCFFD4FFB9F4A9F8EFFBABF8BE" box="[915,1033,1814,1835]" class="Bacillariophyceae" family="Bacillariaceae" genus="Fragilariopsis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Bacillariales" pageId="4" pageNumber="97" phylum="Ochrophyta" rank="species" species="oceanica">
<emphasis id="B91EF95DFFD4FFB9F4A9F8EFFBABF8BE" box="[915,1033,1814,1835]" italics="true" pageId="4" pageNumber="97">F. oceanica</emphasis>
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to overcome the negative effects of GeO
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. Other factors such as the different treatments of the glass beakers (acid-washed) and water tanks (hand washing and sodium hypochlorite) prior to the experiments could also have contributed to the different outcomes of the two experiments. Nevertheless, since the large-scale experiment showed a considerable reduction in diatom density on the Plexiglass surfaces by
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GeO
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l
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(f.c.), the costs for the biomass production of
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<emphasis id="B91EF95DFFD5FFB8F6AEFEB2FDB5FEF5" box="[404,535,331,352]" italics="true" pageId="5" pageNumber="98">U. fenestrata</emphasis>
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are expected to be lower than without employing any GeO
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at all.
</paragraph>
</subSubSection>
</treatment>
</document>