Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves

Autores
Ros Franch, Sonia; Echevarría, Javier
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Diversity depletion is the result of the combined action of origination and extinction rates. The present study is an attempt to understand this dynamic by the analysis of the end-Triassic extinction event in a very well represented group: the marine bivalves. This is tackled in two steps: a) first we test the selectivity of extinction respect to the main autoecological characteristics of the genera (feeding mechanism, tiering, motility and attachment) among other features (mineralogy, age at the T-J boundary, paleogeographic distribution) by means of generalized linear models and resampling methods; and b) we analyze the evolutionary rates in the orders included. The results of the selectivity analysis show: 1) a positive selection for deep burrowers and a negative selection against reclined habits; 2) a significant association between mineralogy and survival odds, although this could be due to the strong correlation between mineralogy and tiering; 3) a lack of selection for age or geographic distribution (both traits strongly associated), although the last one would require a more detailed examination. From the analysis of the evolutionary rates we can conclude that: 1- all the orders show a negative growth rate during the Rhaetian (in some of them already starting during the Norian), with the main exception of generalist orders (Arcoida, Mytiloida) and deep burrowers (Pholadomyoida); 2- the most affected orders were Hippuritoida (reclined), Trigonioida, Nuculoida (both shallow burrowers) and Modiomorphoida (mostly shallow burrowers and endobyssate). The lack of selectivity for age and distribution points to an indiscriminate extinction. On the other hand, the preferential survival of deep burrowers suggests that some isolated environments were not equally affected by the general disruption; and the differences in growth rates show that the extinction event was strong enough to affect the specialized guilds, but not enough to affect the generalist ones.
Sesiones libres
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16961

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spelling Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalvesRos Franch, SoniaEchevarría, JavierCiencias NaturalesPaleontologíaDiversity depletion is the result of the combined action of origination and extinction rates. The present study is an attempt to understand this dynamic by the analysis of the end-Triassic extinction event in a very well represented group: the marine bivalves. This is tackled in two steps: a) first we test the selectivity of extinction respect to the main autoecological characteristics of the genera (feeding mechanism, tiering, motility and attachment) among other features (mineralogy, age at the T-J boundary, paleogeographic distribution) by means of generalized linear models and resampling methods; and b) we analyze the evolutionary rates in the orders included. The results of the selectivity analysis show: 1) a positive selection for deep burrowers and a negative selection against reclined habits; 2) a significant association between mineralogy and survival odds, although this could be due to the strong correlation between mineralogy and tiering; 3) a lack of selection for age or geographic distribution (both traits strongly associated), although the last one would require a more detailed examination. From the analysis of the evolutionary rates we can conclude that: 1- all the orders show a negative growth rate during the Rhaetian (in some of them already starting during the Norian), with the main exception of generalist orders (Arcoida, Mytiloida) and deep burrowers (Pholadomyoida); 2- the most affected orders were Hippuritoida (reclined), Trigonioida, Nuculoida (both shallow burrowers) and Modiomorphoida (mostly shallow burrowers and endobyssate). The lack of selectivity for age and distribution points to an indiscriminate extinction. On the other hand, the preferential survival of deep burrowers suggests that some isolated environments were not equally affected by the general disruption; and the differences in growth rates show that the extinction event was strong enough to affect the specialized guilds, but not enough to affect the generalist ones.Sesiones libresFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16961enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/url/https://sedici.unlp.edu.ar/handle/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:53:03Zoai:sedici.unlp.edu.ar:10915/16961Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:53:04.164SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
title Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
spellingShingle Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
Ros Franch, Sonia
Ciencias Naturales
Paleontología
title_short Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
title_full Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
title_fullStr Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
title_full_unstemmed Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
title_sort Extinction selectivity and diversity depletion in the Triassic/Jurassic boundary among bivalves
dc.creator.none.fl_str_mv Ros Franch, Sonia
Echevarría, Javier
author Ros Franch, Sonia
author_facet Ros Franch, Sonia
Echevarría, Javier
author_role author
author2 Echevarría, Javier
author2_role author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
topic Ciencias Naturales
Paleontología
dc.description.none.fl_txt_mv Diversity depletion is the result of the combined action of origination and extinction rates. The present study is an attempt to understand this dynamic by the analysis of the end-Triassic extinction event in a very well represented group: the marine bivalves. This is tackled in two steps: a) first we test the selectivity of extinction respect to the main autoecological characteristics of the genera (feeding mechanism, tiering, motility and attachment) among other features (mineralogy, age at the T-J boundary, paleogeographic distribution) by means of generalized linear models and resampling methods; and b) we analyze the evolutionary rates in the orders included. The results of the selectivity analysis show: 1) a positive selection for deep burrowers and a negative selection against reclined habits; 2) a significant association between mineralogy and survival odds, although this could be due to the strong correlation between mineralogy and tiering; 3) a lack of selection for age or geographic distribution (both traits strongly associated), although the last one would require a more detailed examination. From the analysis of the evolutionary rates we can conclude that: 1- all the orders show a negative growth rate during the Rhaetian (in some of them already starting during the Norian), with the main exception of generalist orders (Arcoida, Mytiloida) and deep burrowers (Pholadomyoida); 2- the most affected orders were Hippuritoida (reclined), Trigonioida, Nuculoida (both shallow burrowers) and Modiomorphoida (mostly shallow burrowers and endobyssate). The lack of selectivity for age and distribution points to an indiscriminate extinction. On the other hand, the preferential survival of deep burrowers suggests that some isolated environments were not equally affected by the general disruption; and the differences in growth rates show that the extinction event was strong enough to affect the specialized guilds, but not enough to affect the generalist ones.
Sesiones libres
Facultad de Ciencias Naturales y Museo
description Diversity depletion is the result of the combined action of origination and extinction rates. The present study is an attempt to understand this dynamic by the analysis of the end-Triassic extinction event in a very well represented group: the marine bivalves. This is tackled in two steps: a) first we test the selectivity of extinction respect to the main autoecological characteristics of the genera (feeding mechanism, tiering, motility and attachment) among other features (mineralogy, age at the T-J boundary, paleogeographic distribution) by means of generalized linear models and resampling methods; and b) we analyze the evolutionary rates in the orders included. The results of the selectivity analysis show: 1) a positive selection for deep burrowers and a negative selection against reclined habits; 2) a significant association between mineralogy and survival odds, although this could be due to the strong correlation between mineralogy and tiering; 3) a lack of selection for age or geographic distribution (both traits strongly associated), although the last one would require a more detailed examination. From the analysis of the evolutionary rates we can conclude that: 1- all the orders show a negative growth rate during the Rhaetian (in some of them already starting during the Norian), with the main exception of generalist orders (Arcoida, Mytiloida) and deep burrowers (Pholadomyoida); 2- the most affected orders were Hippuritoida (reclined), Trigonioida, Nuculoida (both shallow burrowers) and Modiomorphoida (mostly shallow burrowers and endobyssate). The lack of selectivity for age and distribution points to an indiscriminate extinction. On the other hand, the preferential survival of deep burrowers suggests that some isolated environments were not equally affected by the general disruption; and the differences in growth rates show that the extinction event was strong enough to affect the specialized guilds, but not enough to affect the generalist ones.
publishDate 2010
dc.date.none.fl_str_mv 2010
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