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Título : Discovering floristic and geoecological gradients across Amazonia
Autor : Tuomisto, H.
Van doninck, J.
Ruokolainen, K.
Massaine Moulatlet, Gabriel
Figueiredo, FOG
Sirén, A
Cárdenas, G
Lehtonen, S
Zuquim, G
Palabras clave : Amazonia
Remote sensing
Medium resolution multispectral imagery
Biogeographical regions
vegetation
Landsat
Geoecological regions
Floristic gradients
Fecha de publicación : 2019
Citación : Tuomisto H, Van doninck J, Ruokolainen K, Moulatlet GM, Figueiredo FOG, Sirén A, Cárdenas G, Lehtonen S, Zuquim G (2019) Discovering floristic and geoecological gradients across Amazonia. Journal of Biogeography. https://doi.org/10.1111/jbi.13627
Citación : PRODUCCIÓN CIENTÍFICA-ARTÍCULOS;A-IKIAM-000188
Resumen : Aim: To map and interpret floristic and geoecological patterns across the Amazon basin by combining extensive field data with basin-wide Landsat imagery and climatic data Location: Amazonia Taxon: Ground truth data on ferns and lycophytes; remote sensing results reflect forest canopy properties Methods: We used field plot data to assess main ecological gradients across Amazonia and to relate floristic ordination axes to soil base cation concentration, CHELSA climatic variables and reflectance values from a basin-wide Landsat image composite with generalized linear models (GLM). Ordination axes were then predicted across all Amazonia using Landsat and CHELSA, and a regional subdivision was obtained using k-medoid classification. Results: The primary floristic gradient was strongly related to base cation concentration in the soil, and the secondary gradient to climatic variables. The Landsat image composite revealed a tapestry of broad-scale variation in canopy reflectance characteristics across Amazonia. Ordination axis scores predicted using Landsat and CHELSA variables produced spatial patterns consistent with existing knowledge on soils, geology and vegetation, but also suggested new floristic patterns. The clearest dichotomy was between central Amazonia and the peripheral areas, and the available data supported a classification into at least eight subregions. Main conclusions Landsat data are capable of predicting soil-related species compositional patterns of understory ferns and lycophytes across the Amazon basin with surprisingly high accuracy. Although the exact floristic relationships may differ among plant groups, the observed ecological gradients must be relevant for other plants as well, since surface reflectance recorded by satellites is mostly influenced by the tree canopy. This opens exciting prospects for species distribution modelling, conservation planning, and biogeographical and ecological studies on Amazonian biota. Our maps provide a preliminary geoecological subdivision of Amazonia that can now be tested and refined using field data of other plant groups and from hitherto unsampled areas.
URI : http://repositorio.ikiam.edu.ec/jspui/handle/RD_IKIAM/281
https://doi.org/10.1111/jbi.13627
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