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	Curva di accumulazione di specie	Analisi del Valore Indicatore
Campo	Ecologia	Ecologia
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	1968	1997
Ideatore	Henry Sanders	Marc Dufrene and Pierre Legendre
Tipo	biodiversity quantification and comparison	species-habitat association analysis
Fonte seminale	Colwell, R. K. (1994). Estimating terrestrial biodiversity through extrapolation. Philosophical Transactions of the Royal Society B, 345(1311), 101-118.	Dufrene, M., & Legendre, P. (1997). Species assemblages and indicator species: the need for a flexible asymmetrical approach. Ecological Monographs, 67(3), 345-366.
Alias	rarefaction, species accumulation curve, species richness curve	IndVal, indicator species, fidelity, specificity
Correlati	4	4
Sintesi	Species accumulation curves describe how the number of observed species increases with cumulative sampling effort. Introduced by Sanders (1968) and developed by Colwell and colleagues, this method enables ecologists to compare biodiversity across sites and estimate total species richness despite incomplete sampling. It addresses a fundamental challenge in ecology: observed species counts are biased by sampling intensity.	Indicator Value (IndVal) analysis, developed by Dufrene and Legendre (1997), identifies species that reliably indicate the presence of particular environmental conditions, habitat types, or community groups. The method quantifies the association between species and habitat, producing an indicator value that combines specificity (exclusive preference for certain habitats) and fidelity (consistent presence when the habitat occurs). IndVal is widely used in conservation to identify species of management concern, in habitat typing to discover indicator species, and in restoration ecology to assess whether recovered communities match reference conditions.