title: [Sampling effort and floristic atlases: survey completeness of localities and description of knowledge gaps].
abstract: Floristic atlases have an important input to flora conservation planning even though their data quality varied greatly across countries. This study aimed to assess survey completeness of cells of floristic atlases. Then, a surveying guide is designed to overcome as efficiently as possible sampling biases. A review and analyses on a wide dataset were carried out to select an estimator of the true species richness of surveyed cells. The Jackknife 1, a non-parametric estimator, appeared as the best compromise for regional floristic atlases. The number of records in each cell was used as an estimator of sampling effort. The ratio between the observed species richness and the estimated species richness measures the completeness of inventories in each surveyed cell. Eighteen variables were selected to describe current inventories and design new surveys. These variables highlight locations, periods and species to be given priority in future studies.
authors: Conservatoire botanique national du Bassin parisien - délégation Sarthe, UMS 2699 CNRS-MNHN inventaire et suivi de la biodiversité, Muséum national d'histoire naturelle, 43, rue de l'Estérel, 72000 Le Mans, France. jvallet@mnhn.fr
authors: Jeanne
authors: J
authors: Vallet
authors: Maëlle
authors: M
authors: Rambaud
authors: Loïc
authors: L
authors: Coquel
authors: Laurent
authors: L
authors: Poncet
authors: Frédéric
authors: F
authors: Hendoux
mesh_terms: D001271:Atlases as Topic; D044822:Biodiversity; D001901:Botany; D002965:Classification / Q000379:methods; D003247:Conservation of Natural Resources; D017753:Ecosystem; D005602:France; D010944:Plants / Q000145:classification