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  • Please use this identifier to cite or link to this item: https://repositorio.uti.edu.ec//handle/123456789/3444
    Title: Narrow thermal tolerance and low dispersal drive higher speciation in tropical mountains
    Authors: Polato, Nicholas
    Gill, Brian
    Shah, Alisha
    Gray, Miranda
    Casner, Kayce
    Barthelet, Antoine
    Messer, Philipp
    Simmons, Mark
    Guayasamín, Juan
    Encalada, Andrea
    Kondratieff, Boris
    Flecker, Alexander
    Issue Date: 2018
    Publisher: Proceedings of the National Academy of Sciences of the United States of America. Volume 115, Issue 49, Pages 12471 - 12476
    Abstract: Species richness is greatest in the tropics, and much of this diversity is concentrated in mountains. Janzen proposed that reduced seasonal temperature variation selects for narrower thermal tolerances and limited dispersal along tropical elevation gradients [Janzen DH (1967) Am Nat 101:233–249]. These locally adapted traits should, in turn, promote reproductive isolation and higher speciation rates in tropical mountains compared with temperate ones. Here, we show that tropical and temperate montane stream insects have diverged in thermal tolerance and dispersal capacity, two key traits that are drivers of isolation in montane populations. Tropical species in each of three insect clades have markedly narrower thermal tolerances and lower dispersal than temperate species, resulting in significantly greater population divergence, higher cryptic diversity, higher tropical speciation rates, and greater accumulation of species over time. Our study also indicates that tropical montane species, with narrower thermal tolerance and reduced dispersal ability, will be especially vulnerable to rapid climate change. © 2018 National Academy of Sciences. All rights reserved.
    URI: https://www.pnas.org/doi/10.1073/pnas.1809326115
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