Ecologic zonation model of the benthic foraminifera and thecamoebians of Guadiana river estuary and application in paleoenvironmental reconstruction

Camacho, Sarita

Publication

Ecologic zonation model of the benthic foraminifera and thecamoebians of Guadiana river estuary and application in paleoenvironmental reconstruction

2013-06-07Doctoral thesis

datacite.subject.fos	Ciências Naturais::Outras Ciências Naturais	pt_PT
dc.contributor.advisor	Moura, Delminda
dc.contributor.advisor	Boski, T.
dc.contributor.advisor	Scott, David B.
dc.contributor.author	Camacho, Sarita
dc.date.accessioned	2016-02-24T16:00:56Z
dc.date.available	2016-02-24T16:00:56Z
dc.date.issued	2013-06-07
dc.date.submitted	2012
dc.description	Tese de doutoramento, Ciências do Mar ( Processos de Ecossistemas Marinhos), Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2012
dc.description.abstract	This thesis explores the potential of benthic foraminifera as environmental indicators in the Guadiana River estuary according to an actual perspective, where we study the species distribution patterns and their responses to seasonal environmental changes and a paleoenvironmental perspective, in which the previous information in combination with the knowledge of diagenetic processes is applied in interpreting analogues environments that formed in the estuary during the Holocene. The variation of environmental parameters in the estuary showed strong dependence on spatial and seasonal gradients, exhibiting prevailing river conditions in winter and marine conditions in summer. The distribution of foraminifera in the Guadiana estuary mirrored the seasonal variation of environmental factors, whose relative importance depended on the proximity the tolerance limits of the species. The elevation proved to be the most important parameter in the distribution of foraminifera by combining the effect of a series of other variables. Based on the dominant species of living foraminifera and seasonal variations in their relations was possible to define a model of ecological zonation for the Guadiana estuary. Four biocenoses were identified and compared with the fraction of dead and fossil foraminifera. The total assemblage that combines the seasonal and taphonomic effects on modern microfaunas proved to represent reliably the estuary indigenous microfauna. Its application in the interpretation of paleoenvironments recorded over two sedimentary sequences (CM3 and CM5) allowed refining the knowledge on how the estuary has evolved over the past 13 000 cal yr BP. The pioneering study of communities of thecamoebian and tintinnids suggests that both groups are an asset in studies of environmental monitoring and paleoenvironmental reconstruction. The present work demonstrated that the three indicators analyzed, when integrated in a multi-proxy perspective, increase the potential interpretive which can be applied in paleoenvironmental reconstructions.	pt_PT
dc.description.sponsorship	FCT - Fundação para a Ciência e Tecnologia: SFRH/BD/28265/2006	pt_PT
dc.identifier.tid	101246250
dc.identifier.uri	http://hdl.handle.net/10400.1/7738
dc.language.iso	eng	pt_PT
dc.subject	Ecossistemas marinhos	pt_PT
dc.subject	Estuários	pt_PT
dc.subject	Foraminíferos	pt_PT
dc.subject	Holocénico	pt_PT
dc.subject	Algarve - Rio Guadiana	pt_PT
dc.title	Ecologic zonation model of the benthic foraminifera and thecamoebians of Guadiana river estuary and application in paleoenvironmental reconstruction	pt_PT
dc.title.alternative	Atlas of benthic foraminifera and thecamoebian species from the Guadiana river estuary	pt_PT
dc.type	doctoral thesis
dspace.entity.type	Publication
person.familyName	Camacho
person.givenName	Sarita
person.identifier.ciencia-id	9B1A-D006-F736
person.identifier.orcid	0000-0002-2986-7156
person.identifier.rid	E-9559-2015
rcaap.rights	openAccess	pt_PT
rcaap.type	doctoralThesis	pt_PT
relation.isAuthorOfPublication	708d6c78-57d3-40cb-bf28-705f838e69e2
relation.isAuthorOfPublication.latestForDiscovery	708d6c78-57d3-40cb-bf28-705f838e69e2
thesis.degree.grantor	Universidade do Algarve. Faculdade de Ciências e Tecnologia
thesis.degree.level	Doutor
thesis.degree.name	Doutoramento em Ciências do Mar. Processos de Ecossistemas Marinhos	pt_PT