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[Submitted on 8 Aug 2025 ( v1 ), last revised 1 Oct 2026 (this version, v3)] Title:Speciation by local adaptation and isolation by distance in extended environments View a PDF of the paper titled Speciation by local adaptation and isolation by distance in extended environments, by Lara D. Hissa and 1 other authors View PDF HTML (experimental) Abstract:Speciation is often associated with geographical barriers that limit gene flow.
Geographic barriers can come and go depending on natural conditions. These fluctuations cause population cycles of expansion and contraction, introducing intermittent migrations that may not hinder speciation but rather promote diversification. Here, we study a neutral two-island speciation model with intermittent migration driven by sea-level fluctuations.
Population Health Metrics, Sep 2023 Current measures for monitoring progress towards universal health coverage (UHC) do not adequately account for populations that do not have the same level of access to quality care services and/or financial protection to cover health expenses for when care is accessed. This gap in accounting for unmet health care needs may contribute to underutilization of needed services or widening inequalities.
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