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New physical and biological evidence of lateral transport affecting dinoflagellate cyst distribution in the benthic nepheloid layer along a land-sea transect off Figueira da Foz (Atlantic Iberian margin)

2023Journal article Open access
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dc.contributor.authorGarcía-Moreiras, Iria
dc.contributor.authorHatherly, Melissa
dc.contributor.authorZonneveld, Karin
dc.contributor.authorDubert, Jesus
dc.contributor.authorNolasco, Rita
dc.contributor.authorSantos, Ana Isabel
dc.contributor.authorOliveira, Anabela
dc.contributor.authorMoita, Teresa
dc.contributor.authorOliveira, Paulo B.
dc.contributor.authorMagalhães, Jorge M.
dc.contributor.authorAmorim, Ana
dc.date.accessioned2024-01-30T10:22:50Z
dc.date.available2024-01-30T10:22:50Z
dc.date.issued2023
dc.description.abstractntroduction The production of resting cysts is a key dispersal and survival strategy of many dinoflagellate species. However, little is known about the role of suspended cysts in the benthic nepheloid layer (BNL) in the initiation and decline of planktonic populations.Methods In September 2019, sampling of the dinoflagellate cyst community at different water depths in the water column and in the bottom sediments, and studies of spatio-temporal changes in physical properties (temperature, salinity, density and suspended sediment concentration), were carried out along a land-sea transect off Figueira da Foz (NW Portugal) to investigate the dinoflagellate cyst distribution and the factors (physical and biological) affecting it. A clustering analysis was used to compare the BNL and sediment cyst records with the cyst rain recorded by a sediment trap at a fixed station. Furthermore, Lagrangian particle experiments enabled simulating cyst trajectories in the BNL 5 and 10 days before sampling and assessing cross-shore, vertical and alongshore transport within the studied region.Results A well-developed BNL was present during the survey, which covered a change from active (14th of September) to relaxed (19th of September) upwelling conditions. Organic-walled dinoflagellate cysts were dominant in all samples, although calcareous dinoflagellate cysts consistently occurred (at low abundances). High proportions of full cysts were observed in the BNL, of which a significant portion was viable as shown by excystment experiments. Moreover, BNL cyst records collected on the 19th of September along the land-sea transect were similar to the sediment trap cyst record but greatly differed from sediment cyst records. The heterotrophic small spiny brown cysts (SBC) and cysts of the autotrophic yessotoxin-producer Protoceratium reticulatum notably increased during the survey, in the BNL and in the water column above.Discussion The comparison of the BNL, surface sediment and sediment trap cyst records supported that the main origin of cysts in the BNL was the recent production in the water column. The spatial coincidences in the distribution of cysts and vegetative cells of Protoceratium reticulatum also supported that full cysts in the water column were being produced in surface waters. New data evidenced the presence of a significant reservoir of viable cysts in the BNL that have the potential to seed new planktonic blooms. Furthermore, back-track particle modelling evidenced that alongshore advection was the main physical mechanism controlling cyst dynamics in the BNL during most part of the survey period, being particularly intense in coastal stations (<100 m depth). Consequently, the sediment cyst signal is a mixture of locally and regionally produced cysts. We provide multi-disciplinary data evidencing that cysts recently formed in the photic zone can be laterally advected within the studied region through the BNL, contributing to a better understanding of the role of the BNL in cyst dynamics and tracing the seed sources of the new blooms.pt_PT
dc.description.sponsorshipProject LISBOA-01-0145-FEDER031265; AQUIMAR project MAR2020; MAR-02.01.01-FEAMP-017;pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3389/fmars.2023.1270343pt_PT
dc.identifier.eissn2296-7745
dc.identifier.urihttp://hdl.handle.net/10400.1/20321
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Mediapt_PT
dc.relationInterdisciplinary Centre of Marine and Environmental Research
dc.relationMarine and Environmental Sciences Centre
dc.relationAquatic Research Infrastructure Network
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectBenthic nepheloid layerpt_PT
dc.subjectDinoflagellate cystspt_PT
dc.subjectCyst reservoirpt_PT
dc.subjectAdvectionpt_PT
dc.subjectCoastal ecosystemspt_PT
dc.subjectPortuguese marginpt_PT
dc.titleNew physical and biological evidence of lateral transport affecting dinoflagellate cyst distribution in the benthic nepheloid layer along a land-sea transect off Figueira da Foz (Atlantic Iberian margin)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInterdisciplinary Centre of Marine and Environmental Research
oaire.awardTitleMarine and Environmental Sciences Centre
oaire.awardTitleAquatic Research Infrastructure Network
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04423%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04292%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0069%2F2020/PT
oaire.citation.titleFrontiers in Marine Sciencept_PT
oaire.citation.volume10pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameMoita
person.givenNameTeresa
person.identifier.ciencia-idB814-54C9-061E
person.identifier.orcid0000-0001-9059-0646
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscovery26645d06-f7df-43c2-80d2-4660c7697597
relation.isProjectOfPublicationb2e68640-2978-4601-a400-c2eb842438da
relation.isProjectOfPublication61d0bac5-8f85-40c7-ac39-0fb64c5ff771
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