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An influential early view held that ecosystems contain niches for a limited number of species and that competition for resources among species-whether native or nonnative invading ones-determines ecosystems` species composition.
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26 de oct. de 2017 · 1. An influential early view held that ecosystems contain niches for a limited number of species and that competition for resources among species —whether native or nonnative invading ones — determines ecosystems’ species composition. 一种颇有影响的早期观点认为，相对于所有物种生态系统只能提供有限的生态位，而物种间对生存资源的竞争 —— 无论本地物种或入侵物种 —— 决定了生态系统的物种构成。 2.
An influential early view held that ecosystems contain niches for a limited number of species and that competition for resources among species—whether native or nonnative invading ones—determines ecosystems’ species composition. However, factors other than competition often help explain invading species’ success.
Issue Date December 2016. This paper estimates the long-term benefits from an influential early childhood program targeting disadvantaged families. The program was evaluated by random assignment and followed participants through their mid-30s.
- Jorge Luis García, James J Heckman, Duncan Ermini Leaf, María José Prados
- 2016
Research Summary: The Lifecycle Benefits of an Influential Early Childhood Program View Summary. This two-page summary discusses the key takeaways of Professor Heckman’s latest research, “The Lifecycle Benefits of an Influential Early Childhood Program.”.
ABSTRACT. This paper estimates the long-term benefits from an influential early childhood program targeting disadvantaged families. The program was evaluated by random assignment and followed participants through their mid-30s.
