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dc.contributor.author
Hassan, Gabriela Susana  
dc.contributor.author
Diaz, Marisel Carina  
dc.date.available
2023-10-09T13:06:36Z  
dc.date.issued
2021  
dc.identifier.citation
Experimental taphonomy of freshwater diatoms: discriminating between chemical and physical causes of frustule fragmentation; 2nd Workshop on Actualistic Taphonomy; Rio Grande do SUl; Brasil; 2021; 23-23  
dc.identifier.uri
http://hdl.handle.net/11336/214492  
dc.description.abstract
Frustulefragmentation is one of the major taphonomic factors affecting diatompreservation in Pampean shallow lakes. This has been demonstrated both bycontemporary and fossil taphonomic studies, although little is known about thecauses of frustule breakage and its environmental significance. Field studiesalong modern environmental gradients showed a low but significant correlationbetween dissolution and fragmentation, suggesting that debilitation of thefrustule by silica dissolution can be the cause of diatom fragmentation.Reworking of sediments by wind action have also be suggested as a possibleexplanation for the observed fragmentation patterns. To evaluate the relativeimportance of chemical and physical causes of diatom fragmentation, three laboratoryexperiments were conducted to test for 1) the effect of physical agitation, 2)the effect of chemical dissolution, and 3) the joint effect of both variableson diatom fragmentation. Physical agitation was simulated by subjecting diatomsamples to lineal shaking at 250 rpm during 30 days. Chemical dissolution wastested by mixing diatom assemblages with solutions of different concentrationsof NaCl and NaHCO3, and pH 10 during 20days. The joint effect of both processes was tested by diluting diatomassemblages in salt solutions and subjecting them to agitation during 20 daysat 250 rpm. In all cases, aliquots of each assemblage were sampled at initialand final experimental times and taphonomically analyzed through theapplication of fragmentation and dissolution indices. Significant differencesin fragmentation indices were observed both in dissolution alone and combinedexperiments, but no differences were found in the agitation alone essay. In allcases, dissolution and fragmentation indices were correlated, suggesting acausal relationship among them. Overall, our results suggest that the debilitationof the diatom frustule by chemical dissolution may be the main cause of theobserved fragmentation patterns in surface sediments of Pampean shallow lakes.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Universidad de Rio Grande do Sul  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Diatoms  
dc.subject
Fragmentation  
dc.subject
Experimental taphonomy  
dc.subject
Pampean lakes  
dc.subject.classification
Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Experimental taphonomy of freshwater diatoms: discriminating between chemical and physical causes of frustule fragmentation  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.type
info:eu-repo/semantics/conferenceObject  
dc.type
info:ar-repo/semantics/documento de conferencia  
dc.date.updated
2023-06-06T17:49:29Z  
dc.journal.pagination
23-23  
dc.journal.pais
Brasil  
dc.journal.ciudad
Rio Grande do Sul  
dc.description.fil
Fil: Hassan, Gabriela Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina  
dc.description.fil
Fil: Diaz, Marisel Carina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.ufrgs.br/taas/wp-content/uploads/2021/07/Abstracts-2nd-TAAS-Workshop-on-Actualistic-Taphonomy-in-South-America.pdf  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5281/zenodo.5114543  
dc.conicet.rol
Autor  
dc.conicet.rol
Autor  
dc.coverage
Internacional  
dc.type.subtype
Workshop  
dc.description.nombreEvento
2nd Workshop on Actualistic Taphonomy  
dc.date.evento
2021-07-19  
dc.description.ciudadEvento
Rio Grande do SUl  
dc.description.paisEvento
Brasil  
dc.type.publicacion
Journal  
dc.description.institucionOrganizadora
Universidade Federal do Rio Grande do Sul  
dc.source.revista
2nd Workshop on Actualistic Taphonomy: Abstracts  
dc.date.eventoHasta
2021-07-21  
dc.type
Workshop