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• W2023338984 abstract "Abstract Aim One prominent explanation for the latitudinal gradient in biodiversity proposes that its prime cause is the greater age and/or higher origination rates of tropical clades, and the infrequent or delayed dispersal of their component species into temperate regions. An alternative is that species’ carrying capacities vary regionally, which influences rates of time‐averaged diversification via ecological opportunity. We contrast these hypotheses, in order to assess potential historical influences upon the latitudinal gradient of New World passerine birds (order Passeriformes), comparing patterns among the two suborders present (oscines and suboscines), which are known to have had different routes of dispersal across the region. Location New World. Methods We examine diversity patterns, their abiotic and biotic correlates, and the distributions of phylogenetically old and young species. Results Strong latitudinal gradients are present within both oscine and suboscine birds, with maximum diversity towards the equator, but their overall shapes differ. Among the oscines, older lineages are found towards the north, with progressively younger lineages present further south. Regional variation in oscine richness is statistically well explained by a combination of productivity and elevation ( R 2 = 0.76). In contrast, few suboscine groups have colonized the north, so their current diversity is well correlated with temperature seasonality ( R 2 = 0.74). Main conclusions Because the oscines colonized the Americas from the north, their latitudinal gradient must reflect regional differences in time‐averaged diversification rates, and not the time present within a region. The richness patterns derived from phylogenetic data and the strong predictive power of the normalized difference vegetation index (NDVI) suggest that the radiation of the oscines is consistent with the idea that entry into a new region stimulates a burst of diversification, which is higher and/or continues for longer in areas with greater carrying capacity. Conversely, the suboscine distributions potentially reflect a large historical barrier to dispersal and niche conservatism of climatic tolerances, possibly coupled with competition from the oscines. Although contemporary conditions can explain much of the passerine diversity patterns, history has had an important influence on the taxonomic composition of this gradient." @default.
• W2023338984 created "2016-06-24" @default.
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• W2023338984 date "2014-05-29" @default.
• W2023338984 modified "2023-10-03" @default.
• W2023338984 title "Into and out of the tropics: the generation of the latitudinal gradient among New World passerine birds" @default.
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• W2023338984 doi "https://doi.org/10.1111/jbi.12346" @default.
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