Changes in forest diversity over a chronosequence of fluvial islands
| Autor: | María Soledad Pereira, Federico Brumnich, Zuleica Yael Marchetti |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
VEGETATION DYNAMICS Floodplain Gamma diversity HYDROGEOMORPHIC DYNAMICS Chronosequence Beta diversity Ecological succession Geociencias multidisciplinaria 01 natural sciences Ciencias de la Tierra y relacionadas con el Medio Ambiente Ciencias Biológicas purl.org/becyt/ford/1 [https] MIDDLE PARANÁ RIVER purl.org/becyt/ford/1.5 [https] FLUVIAL BIOGEOMORPHIC SUCCESSION SAND BARS Middle Paraná River Vegetation Dynamics Sand Bars lcsh:Forestry purl.org/becyt/ford/1.6 [https] Ciencias de las Plantas Botánica Nature and Landscape Conservation geography geography.geographical_feature_category Ecology Environmental Heterogeneity Forestry Plant community 04 agricultural and veterinary sciences Ecología Hydrogeomorphic Dynamics ENVIRONMENTAL HETEROGENEITY Fluvial Biogeomorphic Succession Indicator species 040103 agronomy & agriculture lcsh:SD1-669.5 0401 agriculture forestry and fisheries Alpha diversity CIENCIAS NATURALES Y EXACTAS 010606 plant biology & botany |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET iForest-Biogeosciences and Forestry, Vol 12, Iss 1, Pp 306-316 (2019) |
| ISSN: | 1971-7458 |
| Popis: | The high environmental heterogeneity of large fluvial systems is reflected by the co-existence of contrasting plant communities and landforms. The main objective of this study was to assess the forest diversity changes in islands of the Middle Paraná River (Argentina) in order to discuss an integrative question: how synchronized are the major changes in the features of islands and forests? Persistence age, elevation and flood regime of 11 main channel islands were determined. Variables related to the vascular plant community and the tree stand structure of forests were also measured in 400 m2 plots. Islands were classified as young or old (YIs or OIs), according to their persistence age, which ranged from two to 108 years. Both island classes differed in their elevation but not in the proportion of low water phase. Only three out of nine tree species were dominant: Tessaria integrifolia and Croton urucurana (restricted to YIs and OIs, respectively), and Salix humboldtiana (distributed in both island classes). Alpha diversity was positively correlated with the age of the YIs and reach the highest value in the oldest island forest. Beta diversity was mainly due to processes of species replacement which differentiate floodplain forests. Gamma diversity reached 101 species, being the perennial herbs aclear majority. The stand structure and the complete floristic composition were significantly different between YIs and OIs, with three and seven indicator species of each island class, respectively. Considering integrative models ofsuccession, our findings suggest that the biogeomorphic phase, recognised by the fluvial biogeomorphic model, prevailed in the whole range of island persistence ages. Therefore, it seems that the increase in forest diversity in a large river is restricted to spatial refugia defined by major hydrogeomorphic shifts. Fil: Brumnich, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Litoral; Argentina Fil: Marchetti, Zuleica Yael. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Litoral; Argentina Fil: Pereira, María Soledad. Universidad Nacional del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina |
| Databáze: | OpenAIRE |
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