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	Modello a Proiezione Integrale	Curva di accumulazione di specie
Campo	Ecologia	Ecologia
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	2000	1968
Ideatore	Stephen Ellner and Mark Rees	Henry Sanders
Tipo	size-structured population projection	biodiversity quantification and comparison
Fonte seminale	Easterling, M. R., Ellner, S. P., & Dixon, P. M. (2000). Size-specific sensitivity: applying a new structured population model. Ecology, 81(3), 694-708.	Colwell, R. K. (1994). Estimating terrestrial biodiversity through extrapolation. Philosophical Transactions of the Royal Society B, 345(1311), 101-118.
Alias	IPM, continuous size structure, kernel model, size-structured population	rarefaction, species accumulation curve, species richness curve
Correlati	4	4
Sintesi	Integral projection models (IPMs) are a class of structured population models that use continuous traits (size, age, height) to describe population dynamics. Introduced by Easterling and colleagues (2000) and developed extensively by Ellner, Rees, and collaborators, IPMs overcome limitations of age- or stage-structured models by treating individual traits as continuous. They use integration to project populations forward in time, making them particularly suitable for organisms with continuous size distributions or flexible developmental pathways. IPMs enable estimation of population growth rate (λ), sensitivity analysis, and projection under changing environmental conditions.	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.