Publicação
Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns
| Resumo: | Changes in biomass and photosynthesis of a diatom-dominated microphytobenthos (MPB) intertidal community were studied over a diel emersion period using a combination of O2 and scalar irradiance microprofiling, variable chlorophyll (Chl) fluorescence, and pigment analysis. The MPB biomass in the photic zone (0-0.5 mm) of the sediment exposed to low irradiance (150 μmol photons m(-2) s(-1)) showed a >2-fold increase during the first hours of the emersion period, reaching >0.2 mg Chl a cm(-3). Concentrations of Chl a started to decrease half-way through the emersion period, almost 2 h before tidal inundation. Similarly, O2 concentrations and volumetric gross photosynthesis in the photic zone increased during the first half of the emersion period and then decreased toward the timing of incoming tide/darkness. The results suggest that intertidal MPB community-level photosynthesis is mainly controlled by changes in the productive biomass of the photic zone determined by cell migration. A diel pattern in the photosynthesis vs. irradiance parameters α (photosynthetic efficiency at limiting irradiance) and ETR max (photosynthetic capacity at saturating irradiance) was also observed, suggesting photoacclimation of MPB. Under high light exposure (2000 μmol photons m(-2) s(-1)), lower α, ETR max and sediment O2 concentrations were observed when cell migration was inhibited with the diatom motility inhibitor latrunculin A (Lat A), showing that migration is also used by MPB to maximize photosynthesis by reducing exposure to potentially photoinhibitory light levels. A higher de-epoxidation state in sediment treated with Lat A indicates that the involvement of the xanthophyll cycle in physiological photoprotection is more relevant in MPB when cells are inhibited from migrating. In the studied diatom-dominated MPB intertidal community, cell migration seems to be the key factor regulating photosynthesis over a diel emersion period and upon changes in light exposure. |
|---|---|
| Autores principais: | Cartaxana, Paulo |
| Outros Autores: | Cruz, Sónia; Gameiro, Carla; Kühl, Michael |
| Assunto: | microsensors diatoms migration chlorophyll fluorescence photoacclimation |
| Ano: | 2016 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| _version_ | 1877771558003408896 |
|---|---|
| author | Cartaxana, Paulo |
| author2 | Cruz, Sónia Gameiro, Carla Kühl, Michael |
| author2_role | author author author |
| author_facet | Cartaxana, Paulo Cruz, Sónia Gameiro, Carla Kühl, Michael |
| author_role | author |
| contributor_name_str_mv | Repositório Científico de Acesso Aberto da ULisboa |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Cartaxana, Paulo\"},{\"Person.name\":\"Cruz, Sónia\"},{\"Person.name\":\"Gameiro, Carla\",\"Person.identifier.cienciaID\":\"771B-9D07-AB1A\",\"Person.identifier.orcid\":\"0000-0003-2396-3929\",\"Person.identifier.researcherID\":\"B-5462-2012\",\"Person.identifier.scopusAuthorID\":\"20734253500\"},{\"Person.name\":\"Kühl, Michael\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Repositório Científico de Acesso Aberto da ULisboa |
| datacite.creators.creator.creatorName.fl_str_mv | Cartaxana, Paulo Cruz, Sónia Gameiro, Carla Kühl, Michael |
| datacite.date.Accepted.fl_str_mv | 2016-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2020-01-19T19:15:58Z |
| datacite.date.embargoed.fl_str_mv | 2020-01-19T19:15:58Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | microsensors diatoms migration chlorophyll fluorescence photoacclimation |
| datacite.titles.title.fl_str_mv | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| dc.contributor.none.fl_str_mv | Repositório Científico de Acesso Aberto da ULisboa |
| dc.creator.none.fl_str_mv | Cartaxana, Paulo Cruz, Sónia Gameiro, Carla Kühl, Michael |
| dc.date.Accepted.fl_str_mv | 2016-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2020-01-19T19:15:58Z |
| dc.date.embargoed.fl_str_mv | 2020-01-19T19:15:58Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10451/41092 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | Frontiers Media |
| dc.rights.cclincense.fl_str_mv | http://creativecommons.org/licenses/by/4.0/ |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | microsensors diatoms migration chlorophyll fluorescence photoacclimation |
| dc.title.fl_str_mv | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | Changes in biomass and photosynthesis of a diatom-dominated microphytobenthos (MPB) intertidal community were studied over a diel emersion period using a combination of O2 and scalar irradiance microprofiling, variable chlorophyll (Chl) fluorescence, and pigment analysis. The MPB biomass in the photic zone (0-0.5 mm) of the sediment exposed to low irradiance (150 μmol photons m(-2) s(-1)) showed a >2-fold increase during the first hours of the emersion period, reaching >0.2 mg Chl a cm(-3). Concentrations of Chl a started to decrease half-way through the emersion period, almost 2 h before tidal inundation. Similarly, O2 concentrations and volumetric gross photosynthesis in the photic zone increased during the first half of the emersion period and then decreased toward the timing of incoming tide/darkness. The results suggest that intertidal MPB community-level photosynthesis is mainly controlled by changes in the productive biomass of the photic zone determined by cell migration. A diel pattern in the photosynthesis vs. irradiance parameters α (photosynthetic efficiency at limiting irradiance) and ETR max (photosynthetic capacity at saturating irradiance) was also observed, suggesting photoacclimation of MPB. Under high light exposure (2000 μmol photons m(-2) s(-1)), lower α, ETR max and sediment O2 concentrations were observed when cell migration was inhibited with the diatom motility inhibitor latrunculin A (Lat A), showing that migration is also used by MPB to maximize photosynthesis by reducing exposure to potentially photoinhibitory light levels. A higher de-epoxidation state in sediment treated with Lat A indicates that the involvement of the xanthophyll cycle in physiological photoprotection is more relevant in MPB when cells are inhibited from migrating. In the studied diatom-dominated MPB intertidal community, cell migration seems to be the key factor regulating photosynthesis over a diel emersion period and upon changes in light exposure. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| fulltext.url.fl_str_mv | https://repositorio.ulisboa.pt/bitstreams/53d3abdf-f91a-41aa-9731-16ca2226a3fd/download |
| id | ul_78b843bc4f4ffa21a9360d83cc74bd83 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10451/41092 |
| inst_facet_str | urn:organizationAcronym:ul{{{_:::_}}}Universidade de Lisboa |
| instacron_str | ul |
| institution | Universidade de Lisboa |
| instname_str | Universidade de Lisboa |
| language | eng |
| network_acronym_str | ul |
| network_name_str | Repositório da Universidade de Lisboa |
| oai_identifier_str | oai:repositorio.ulisboa.pt:10451/41092 |
| organization_str_mv | urn:organizationAcronym:ul |
| person_str_mv | Cartaxana, Paulo Cruz, Sónia Gameiro, Carla Gameiro, Carla https://www.ciencia-id.pt/771B-9D07-AB1A 771B-9D07-AB1A http://orcid.org/0000-0003-2396-3929 0000-0003-2396-3929 Kühl, Michael |
| publishDate | 2016 |
| publisher.none.fl_str_mv | Frontiers Media |
| repo_facet_str | urn:repositoryAcronym:ul{{{_:::_}}}Repositório da Universidade de Lisboa |
| reponame_str | Repositório da Universidade de Lisboa |
| repository_id_str | urn:repositoryAcronym:ul |
| service_str_mv | urn:repositoryAcronym:ul |
| spelling | engFrontiers Mediapt_PTChanges in biomass and photosynthesis of a diatom-dominated microphytobenthos (MPB) intertidal community were studied over a diel emersion period using a combination of O2 and scalar irradiance microprofiling, variable chlorophyll (Chl) fluorescence, and pigment analysis. The MPB biomass in the photic zone (0-0.5 mm) of the sediment exposed to low irradiance (150 μmol photons m(-2) s(-1)) showed a >2-fold increase during the first hours of the emersion period, reaching >0.2 mg Chl a cm(-3). Concentrations of Chl a started to decrease half-way through the emersion period, almost 2 h before tidal inundation. Similarly, O2 concentrations and volumetric gross photosynthesis in the photic zone increased during the first half of the emersion period and then decreased toward the timing of incoming tide/darkness. The results suggest that intertidal MPB community-level photosynthesis is mainly controlled by changes in the productive biomass of the photic zone determined by cell migration. A diel pattern in the photosynthesis vs. irradiance parameters α (photosynthetic efficiency at limiting irradiance) and ETR max (photosynthetic capacity at saturating irradiance) was also observed, suggesting photoacclimation of MPB. Under high light exposure (2000 μmol photons m(-2) s(-1)), lower α, ETR max and sediment O2 concentrations were observed when cell migration was inhibited with the diatom motility inhibitor latrunculin A (Lat A), showing that migration is also used by MPB to maximize photosynthesis by reducing exposure to potentially photoinhibitory light levels. A higher de-epoxidation state in sediment treated with Lat A indicates that the involvement of the xanthophyll cycle in physiological photoprotection is more relevant in MPB when cells are inhibited from migrating. In the studied diatom-dominated MPB intertidal community, cell migration seems to be the key factor regulating photosynthesis over a diel emersion period and upon changes in light exposure.application/pdfpt_PTRegulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration PatternsCartaxana, PauloCruz, SóniaPersonalGameiro, CarlaDSpacehttp://dspace.org/items/39490eaa-c76a-4478-9ff0-844df5fb91caDSpacehttp://dspace.org/items/39490eaa-c76a-4478-9ff0-844df5fb91caGameiroCarlaCiência IDhttps://www.ciencia-id.pt771B-9D07-AB1AORCIDhttp://orcid.org0000-0003-2396-3929Researcher IDhttps://www.researcherid.comB-5462-2012Scopus Author IDhttps://www.scopus.com20734253500Kühl, MichaelHostingInstitutionOrganizationalRepositório Científico de Acesso Aberto da ULisboae-mailmailto:repositorio@ulisboa.ptrepositorio@ulisboa.ptISSNIsPartOf1664-302XDOIIsPartOf10.3389/fmicb.2016.008722020-01-19T19:15:58Z20162016-01-01T00:00:00ZHandlehttp://hdl.handle.net/10451/41092http://purl.org/coar/access_right/c_abf2open accessmicrosensorsdiatomsmigrationchlorophyll fluorescencephotoacclimation1129521 bytesliteraturehttp://purl.org/coar/resource_type/c_6501journal article2016http://creativecommons.org/licenses/by/4.0/http://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://repositorio.ulisboa.pt/bitstreams/53d3abdf-f91a-41aa-9731-16ca2226a3fd/downloadFrontiers in Microbiology7872 |
| spellingShingle | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns Cartaxana, Paulo microsensors diatoms migration chlorophyll fluorescence photoacclimation |
| status | SINGLETON |
| subject.fl_str_mv | microsensors diatoms migration chlorophyll fluorescence photoacclimation |
| title | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| title_full | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| title_fullStr | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| title_full_unstemmed | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| title_short | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| title_sort | Regulation of Intertidal Microphytobenthos Photosynthesis Over a Diel Emersion Period Is Strongly Affected by Diatom Migration Patterns |
| topic | microsensors diatoms migration chlorophyll fluorescence photoacclimation |
| topic_facet | microsensors diatoms migration chlorophyll fluorescence photoacclimation |
| url | http://hdl.handle.net/10451/41092 |
| visible | 1 |
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