قارن الطرق

	نموذج الإسقاط المتكامل	منحنى تراكم الأنواع
المجال	علم البيئة	علم البيئة
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	2000	1968
صاحب الطريقة	Stephen Ellner and Mark Rees	Henry Sanders
النوع	size-structured population projection	biodiversity quantification and comparison
المصدر التأسيسي	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.
الأسماء البديلة	IPM, continuous size structure, kernel model, size-structured population	rarefaction, species accumulation curve, species richness curve
ذات صلة	4	4
الملخص	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.