Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina

Gastropods and ostracods are widely used in Quaternary paleoenvironmental reconstructions but the taphonomic studies that should precede them are not as common. In this paper we compare the taphonomic information obtained from assemblages recovered in Holocene fluvial sequences of the Salado River b...

Descripción completa

Detalles Bibliográficos
Autores principales: Pisano, María Florencia, Cusminsky, Gabriela Catalina, Fucks, Enrique Eduardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2022
Materias:
Ciencias Naturales
Comparative taphonomy
Gastropods
Ostracods
Holocene
Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/169674
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-169674
record_format dspace
spelling I19-R120-10915-1696742024-09-05T20:05:30Z http://sedici.unlp.edu.ar/handle/10915/169674 Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina Pisano, María Florencia Cusminsky, Gabriela Catalina Fucks, Enrique Eduardo 2022-04-12 2024-09-05T14:01:53Z en Ciencias Naturales Comparative taphonomy Gastropods Ostracods Holocene Argentina Gastropods and ostracods are widely used in Quaternary paleoenvironmental reconstructions but the taphonomic studies that should precede them are not as common. In this paper we compare the taphonomic information obtained from assemblages recovered in Holocene fluvial sequences of the Salado River basin (Buenos Aires, Argentina) and analyze the changes or similarities between species, localities and stratigraphic units. Using taphonomic grades, gastropod shells were cataloged based on three attributes: fragmentation, discoloration and dissolution. For ostracods, discoloration and dissolution together with the population structure (adults-juveniles A/J, valves-carapace V/C and male-female ratios) were analyzed. For gastropods, Heleobia parchappii, Biomphalaria peregrina and Succinea meridionalis showed similar preservation patterns, and Miradiscops brasiliensis showed least evidence of alteration. In ostracods, these patterns varied among species. For V/C ratio, 7% of assemblages were formed only by valves, 82% were dominated by valves and 11% were dominated by carapaces. Fragmentation and population structure allowed autochthonous and allochthonous associations to be distinguished. Gastropod assemblages with low levels of fragmentation were recovered mainly from the uppermost levels of the stratigraphic profiles. For ostracods, the A/J ratio showed that 52% of the assemblages were dominated by adults with most ontogenetic stages represented and 29% retained their original population structure suggesting they would be autochthonous associations, whereas 19% of the assemblages were dominated by juvenile valves therefore assuming allochthonous associations. Our results indicate that taphonomic analysis is an effective tool that allows identifying autochthonous assemblages, which are the most reliable for robust paleoenvironmental reconstructions. Centro de Estudios Integrales de la Dinámica Exógena Consejo Nacional de Investigaciones Científicas y Técnicas Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Comparative taphonomy
Gastropods
Ostracods
Holocene
Argentina
spellingShingle Ciencias Naturales
Comparative taphonomy
Gastropods
Ostracods
Holocene
Argentina
Pisano, María Florencia
Cusminsky, Gabriela Catalina
Fucks, Enrique Eduardo
Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina
topic_facet Ciencias Naturales
Comparative taphonomy
Gastropods
Ostracods
Holocene
Argentina
description Gastropods and ostracods are widely used in Quaternary paleoenvironmental reconstructions but the taphonomic studies that should precede them are not as common. In this paper we compare the taphonomic information obtained from assemblages recovered in Holocene fluvial sequences of the Salado River basin (Buenos Aires, Argentina) and analyze the changes or similarities between species, localities and stratigraphic units. Using taphonomic grades, gastropod shells were cataloged based on three attributes: fragmentation, discoloration and dissolution. For ostracods, discoloration and dissolution together with the population structure (adults-juveniles A/J, valves-carapace V/C and male-female ratios) were analyzed. For gastropods, Heleobia parchappii, Biomphalaria peregrina and Succinea meridionalis showed similar preservation patterns, and Miradiscops brasiliensis showed least evidence of alteration. In ostracods, these patterns varied among species. For V/C ratio, 7% of assemblages were formed only by valves, 82% were dominated by valves and 11% were dominated by carapaces. Fragmentation and population structure allowed autochthonous and allochthonous associations to be distinguished. Gastropod assemblages with low levels of fragmentation were recovered mainly from the uppermost levels of the stratigraphic profiles. For ostracods, the A/J ratio showed that 52% of the assemblages were dominated by adults with most ontogenetic stages represented and 29% retained their original population structure suggesting they would be autochthonous associations, whereas 19% of the assemblages were dominated by juvenile valves therefore assuming allochthonous associations. Our results indicate that taphonomic analysis is an effective tool that allows identifying autochthonous assemblages, which are the most reliable for robust paleoenvironmental reconstructions.
format Articulo
Articulo
author Pisano, María Florencia
Cusminsky, Gabriela Catalina
Fucks, Enrique Eduardo
author_facet Pisano, María Florencia
Cusminsky, Gabriela Catalina
Fucks, Enrique Eduardo
author_sort Pisano, María Florencia
title Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina
title_short Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina
title_full Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina
title_fullStr Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina
title_full_unstemmed Comparative study of the taphonomic history of Holocene gastropods and ostracods of the high basin of the Salado river, Buenos Aires, Argentina
title_sort comparative study of the taphonomic history of holocene gastropods and ostracods of the high basin of the salado river, buenos aires, argentina
publishDate 2022
url http://sedici.unlp.edu.ar/handle/10915/169674
work_keys_str_mv AT pisanomariaflorencia comparativestudyofthetaphonomichistoryofholocenegastropodsandostracodsofthehighbasinofthesaladoriverbuenosairesargentina
AT cusminskygabrielacatalina comparativestudyofthetaphonomichistoryofholocenegastropodsandostracodsofthehighbasinofthesaladoriverbuenosairesargentina
AT fucksenriqueeduardo comparativestudyofthetaphonomichistoryofholocenegastropodsandostracodsofthehighbasinofthesaladoriverbuenosairesargentina
_version_ 1809774311659012096

Ejemplares similares