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Factors controlling the depth habitat of planktonic foraminifera in the subtropical eastern North Atlantic

2017-02Journal article Open access
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dc.contributor.authorRebotim, Andreia
dc.contributor.authorVoelker, Antje
dc.contributor.authorJonkers, Lukas
dc.contributor.authorWaniek, Joanna J.
dc.contributor.authorMeggers, Helge
dc.contributor.authorSchiebel, Ralf
dc.contributor.authorFraile, Igaratza
dc.contributor.authorSchulz, Michael
dc.contributor.authorKucera, Michal
dc.date.accessioned2018-12-07T14:53:03Z
dc.date.available2018-12-07T14:53:03Z
dc.date.issued2017-02
dc.description.abstractPlanktonic foraminifera preserved in marine sediments archive the physical and chemical conditions under which they built their shells. To interpret the paleoceano-graphic information contained in fossil foraminifera, the recorded proxy signals have to be attributed to the habitat and life cycle characteristics of individual species. Much of our knowledge on habitat depth is based on indirect methods, which reconstruct the depth at which the largest portion of the shell has been calcified. However, habitat depth can be best studied by direct observations in stratified plankton nets. Here we present a synthesis of living planktonic foraminifera abundance data in vertically resolved plankton net hauls taken in the eastern North Atlantic during 12 oceanographic campaigns between 1995 and 2012. Live (cytoplasm-bearing) specimens were counted for each depth interval and the vertical habitat at each station was expressed as average living depth (ALD). This allows us to differentiate species showing an ALD consistently in the upper 100m (e.g., Globigerinoides ruber white and pink), indicating a shallow habitat; species occurring from the surface to the subsurface (e.g., Globigerina bulloides, Globorotalia inflata, Globorotalia truncatulinoides); and species inhabiting the subsurface (e.g., Globorotalia scitula and Globorotalia hirsuta). For 17 species with variable ALD, we assessed whether their depth habitat at a given station could be predicted by mixed layer (ML) depth, temperature in the ML and chlorophyll a concentration in the ML. The influence of seasonal and lunar cycle on the depth habitat was also tested using periodic regression. In 11 out of the 17 tested species, ALD variation appears to have a predictable component. All of the tested parameters were significant in at least one case, with both seasonal and lunar cyclicity as well as the environmental parameters explaining up to >50% of the variance. Thus, G. truncatulinoides, G. hirsuta and G. scitula appear to descend in the water column towards the summer, whereas populations of Trilobatus sacculifer appear to descend in the water column towards the new moon. In all other species, properties of the mixed layer explained more of the observed variance than the periodic models. Chlorophyll a concentration seems least important for ALD, whilst shoaling of the habitat with deepening of the ML is observed most frequently. We observe both shoaling and deepening of species habitat with increasing temperature. Further, we observe that temperature and seawater density at the depth of the ALD were not equally variable among the studied species, and their variability showed no consistent relationship with depth habitat. According to our results, depth habitat of individual species changes in response to different environmental and ontogenetic factors and consequently planktonic foraminifera exhibit not only species-specific mean habitat depths but also species-specific changes in habitat depth.
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT) [SFRH/BD/78016/2011]; MARUM - Center for Marine Environmental Sciences; European Union [228344-EUROFLEETS]; DFG (German Research Foundation) [WA2175/2-1, WA2175/4-1]; German Climate Modeling consortium PalMod - German Federal Ministry of Education and Research (BMBF); CANIGO project (EU) [MAS-CT96-0060]; DFG
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.5194/bg-14-827-2017
dc.identifier.issn1726-4170
dc.identifier.issn1726-4189
dc.identifier.urihttp://hdl.handle.net/10400.1/11326
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCopernicus Gesellschaft Mbh
dc.rights.urihttp://creativecommons.org/licenses/by/4.0
dc.subjectCanary-Islands region
dc.subjectGlobigerinoides-sacculifer brady
dc.subjectSurface-water properties
dc.subjectIsotopic composition
dc.subjectAzores current
dc.subjectVertical-distribution
dc.subjectInterannual variability
dc.subjectPopulation-dynamics
dc.subjectOrbulina-Universa
dc.subjectIberian Margin
dc.titleFactors controlling the depth habitat of planktonic foraminifera in the subtropical eastern North Atlantic
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F78016%2F2011/PT
oaire.citation.endPage859
oaire.citation.issue4
oaire.citation.startPage827
oaire.citation.titleBiogeosciences
oaire.citation.volume14
oaire.fundingStreamSFRH
person.familyNameRebotim
person.familyNameVoelker
person.givenNameAndreia
person.givenNameAntje
person.identifier2315310
person.identifier.ciencia-id7511-A470-FA40
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.orcid0000-0001-6950-6331
person.identifier.orcid0000-0001-6465-6023
person.identifier.ridC-5427-2012
person.identifier.scopus-author-id56829454800
person.identifier.scopus-author-id8784446000
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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