Analysing the representativeness of local-scale palaeodiversity measurements: a case from the Lower Cretaceous plant assemblage of Hautrage (Mons Basin, Belgium)

Abel Barral, Bernard Gomez, Juan M. Zorrilla, José M. Serrano, Johan Yans, Véronique Daviero-Gomez, Timothy A M Ewin, Christophe Lécuyer

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Two plant fossil-bearing beds from the middle Barremian of Belgium were analysed to ascertain how experimental designs affect conclusions regarding palaeodiversity at a local scale. We analysed eight lateral samples per bed taken regularly every 3 m using an exhaustive sub-sampling method. The Clench equation was used to evaluate the completeness of the taxonomic inventory of the samples and the sampling effort needed to obtain a reliable representation of diversity. The number of replicates needed to obtain the same representation of diversity from different nearby lateral samples of the same bed ranged from 5 to 19. Richness (S), Evenness (J) and the number of equiprobable taxa (2H’) greatly varied between samples from the same bed, even over short distances. Only one of the studied samples was representative of the taxonomic inventory of its bed. Our study shows that 1) the selection bias of the sampling area is reduced by increasing the number of lateral samples taken in a bed, enabling more reliable conclusions about local-scale diversity; 2) intense sub-sampling methods are needed to account for statistically independent observations of detailed lateral variation; and 3) sampling methods in palaeodiversity analyses must look for a similar degree of representativeness in samples rather than a homogeneous sample size. Using a sampling effort analysis provides evidence for the completeness of the data set, adjusting the amount of work required. Implementing the Clench equation in palaeodiversity analyses improves the performance of data acquisition in palaeoecological studies and provides a quality test of the data sets derived from them.

langueAnglais
Pages244-257
Nombre de pages14
journalLethaia
Volume50
Numéro2
Les DOIs
étatPublié - 1 avr. 2017

Empreinte digitale

Belgium
basins
Cretaceous
sampling
basin
Barremian
data acquisition
experimental design
fossil
method
fossils
methodology

mots-clés

    Citer ceci

    Barral, Abel ; Gomez, Bernard ; Zorrilla, Juan M. ; Serrano, José M. ; Yans, Johan ; Daviero-Gomez, Véronique ; Ewin, Timothy A M ; Lécuyer, Christophe. / Analysing the representativeness of local-scale palaeodiversity measurements : a case from the Lower Cretaceous plant assemblage of Hautrage (Mons Basin, Belgium). Dans: Lethaia. 2017 ; Vol 50, Numéro 2. p. 244-257.
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    Analysing the representativeness of local-scale palaeodiversity measurements : a case from the Lower Cretaceous plant assemblage of Hautrage (Mons Basin, Belgium). / Barral, Abel; Gomez, Bernard; Zorrilla, Juan M.; Serrano, José M.; Yans, Johan; Daviero-Gomez, Véronique; Ewin, Timothy A M; Lécuyer, Christophe.

    Dans: Lethaia, Vol 50, Numéro 2, 01.04.2017, p. 244-257.

    Résultats de recherche: Contribution à un journal/une revueArticle

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