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dc.contributor.author
Luci, Leticia

dc.date.available
2024-05-08T15:28:39Z
dc.date.issued
2014
dc.identifier.citation
Contrasting encrustation patterns on trigonioid and pectinid bivalves from the Early Cretaceous of the Neuquén Basin, Argentina; 4th International Palaeontological Congress; Mendoza; Argentina; 2014; 566-566
dc.identifier.uri
http://hdl.handle.net/11336/234951
dc.description.abstract
Encrusting faunas provide exceptional opportunities for palaeoecological studies, since they preserve several key features, like absolute abundance and spatial relationships among individuals. The encrusting fauna of semiinfaunal trigonioids of the genus Steinmanella (lower Valanginian of the Mulichinco Formation and upper Valanginian-low Hauterivian of the Agrio Formation) were compared to the large epifaunal pectinid Prohinnites (upper Valanginian, Agrio Formation). Both inhabited shallow normal marine settings. All of their encrusters were mapped, recording their type, size and position. The percentage of shells colonized by at least one encruster was calculated for both basibionts, along with their species richness and Pielow´s Diversity Index. Mean of encrusters per valve were calculated and compared with an analysis of deviance. Each basibiont´s valves were divided in zones to assess the distribution of encrusters by a generalized linear mixed model (GLMM). Percentage of valves encrusted was significantly (p<0.0001) higher for the pectinid (92.68%) than for the trigonioid (43.46%). Likewise, mean of encrusters per valve was higher in Prohinnites (19.34) than in Steinmanella (2.17; p<0.0001). Richness was greater in the pectinid (14 encrusting taxa) than in trigonioids (10). Both encrusting communities were dominated by oysters (Steinmanella: 86% of encrusters; Prohinnites: 57.49%). Solitary organisms prevail over colonial ones in both bivalves, but colonial organisms are more diverse and abundant in the pectinid. Pielow´s indexes are 0.33 (Steinmanella) and 0.56 (Prohinnites). GLMM results showed that encrusters preferred the corselet and escutcheon of trigoniids, and avoided the proximal third of the pectinid´s valves. These results indicate that Prohinnites sustained a more diverse and abundant encrusting fauna than Steinmanella. This is likely due to the pectinid´s epifaunal habit and its heavy, stable ample valves. Both communities correspond to the upper euphotic zone sclerobiofacies; however, in neither of them interactions are common among encrusters, and both are dominated by oysters. The gregarious behavior of oysters, coupled to a greater larvae input (they conformed large barriers of positive relief within the Agrio Formation) were likely key for rapid colonization and coverage of available substrates, which gave them a head-start advantage over other encrusters. They were, however, unable to exclude other encrusters, which could settle on shells regardless of the oyster's presence. This pattern is consistently seen in other mollusks from the Agrio Formation, resulting in encrusting communities structured mostly by larval abundance and disturbance rather than by competitive interactions. Oysters settled early on and replenished themselves as serpulids and other encrusters followed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Asociación Internacional de Paleontología
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
encrustation
dc.subject
pectinid
dc.subject
trigonioid
dc.subject
Cretaceous
dc.subject
Neuquén Basin
dc.subject.classification
Paleontología

dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente

dc.subject.classification
CIENCIAS NATURALES Y EXACTAS

dc.title
Contrasting encrustation patterns on trigonioid and pectinid bivalves from the Early Cretaceous of the Neuquén Basin, Argentina
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
2024-04-24T13:41:20Z
dc.journal.pagination
566-566
dc.journal.pais
Argentina

dc.journal.ciudad
Mendoza
dc.description.fil
Fil: Luci, Leticia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.conicet.rol
Autor

dc.coverage
Internacional
dc.type.subtype
Congreso
dc.description.nombreEvento
4th International Palaeontological Congress
dc.date.evento
2014-09-28
dc.description.ciudadEvento
Mendoza
dc.description.paisEvento
Argentina

dc.type.publicacion
Book
dc.description.institucionOrganizadora
Asociación Internacional de Paleontología
dc.source.libro
4th International Palaeontological Congress
dc.date.eventoHasta
2014-10-03
dc.type
Congreso
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