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Exploring dispersal barriers using landscape genetic resistance modelling in scarlet macaws of the Peruvian Amazon

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Titel Exploring dispersal barriers using landscape genetic resistance modelling in scarlet macaws of the Peruvian Amazon
Autor Peakall, Rod
Heinsohn, Robert G.
Brightsmith, Donald J.
Asner, Gregory P.
Smith, Annabel L.
Olah, George
Mitwirkende MacLeod, Kevin (Music)
Lizenz CC-Namensnennung 3.0 Deutschland:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen.
DOI 10.5446/32196
Herausgeber Filmjungle
Erscheinungsjahr 2016
Sprache Deutsch
Produzent Molnár, Attila Dávid
Produktionsort Peru, Australia, Ireland, Hungary

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Fachgebiet Biowissenschaften / Biologie
Abstract Context. Dispersal is essential for species persistence and landscape genetic studies are valuable tools for identifying potential barriers to dispersal. Macaws have been studied for decades in their natural habitat, but we still have no knowledge of how natural landscape features influence their dispersal. Objectives. We tested for correlations between landscape resistance models and the current population genetic structure of macaws in continuous rainforest to explore natural barriers to their dispersal. Methods. We studied scarlet macaws (Ara macao) over a 13,000 km2 area of continuous primary Amazon rainforest in south-eastern Peru. Using remote sensing imagery from the Carnegie Airborne Observatory, we constructed landscape resistance surfaces in CIRCUITSCAPE based on elevation, canopy height and above-ground carbon distribution. We then used individual- and population-level genetic analyses to examine which landscape features influenced gene flow (genetic distance between individuals and populations). Results. Across the lowland rainforest we found limited population genetic differentiation. However, a population from in an intermountain valley of the Andes (Candamo) showed detectable genetic differentiation from two other populations (Tambopata) located 20-60 km away (FST = 0.008, P = 0.001–0.003). Landscape resistance models revealed that genetic distance between individuals was significantly positively related to elevation. Conclusions. Our landscape resistance analysis suggests that mountain ridges between Candamo and Tambopata may limit gene flow in scarlet macaws. These results serve as baseline data for continued landscape studies of parrots, and will be useful for understanding the impacts of anthropogenic dispersal barriers in the future.
Schlagwörter ara
macaw
landscape genetics

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