Erasmus Hospital

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    282154 research outputs found

    The north-western european economy in the eleventh century: a crucible of change?

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    info:eu-repo/semantics/inPres

    Matrimoine. L’héritage de nos mères, les choses de nous-autres

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    info:eu-repo/semantics/inPres

    Large range sizes link fast life histories with high species richness across wet tropical tree floras

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    Understanding how the traits of lineages are related to diversification is key for elucidating the origin of variation in species richness. Here, we test whether traits are related to species richness among lineages of trees from all major biogeographical settings of the lowland wet tropics. We explore whether variation in mortality rate, breeding system and maximum diameter are related to species richness, either directly or via associations with range size, among 463 genera that contain wet tropical forest trees. For Amazonian genera, we also explore whether traits are related to species richness via variation among genera in mean species-level range size. Lineages with higher mortality rates—faster life-history strategies—have larger ranges in all biogeographic settings and have higher mean species-level range sizes in Amazonia. These lineages also have smaller maximum diameters and, in the Americas, contain dioecious species. In turn, lineages with greater overall range size have higher species richness. Our results show that fast life-history strategies influence species richness in all biogeographic settings because lineages with these ecological strategies have greater range sizes. These links suggest that dispersal has been a key process in the evolution of the tropical forest flora.0info:eu-repo/semantics/publishe

    The Top-Ten Way to Integrate High Schools

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    We investigate "top-N percent" policies in college admission as possible instruments for increasing ethnic diversity in high schools. These policies produce incentives for students to relocate to schools with weaker academic competition. We provide theoretical conditions under which such arbitrage contributes to high-school desegregation. We show that arbitrage can neutralize the policy at the college level, and characterize inter-school ows, which display multiplying cascade effects. Our model's predictions are supported by empirical evidence on the effects of the Texas Top-Ten Percent Law, indicating that a policy intended to support diversity in universities actually helped achieve it in high schools.info:eu-repo/semantics/publishe

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