Drought responses of flood-tolerant trees in Amazonian floodplains

Drought responses of flood-tolerant trees in Amazonian floodplains

• Background Rood-tolerant tree species of the Amazonian floodplain forests are subjected to an annual dry period of variable severity imposed when low river-water levels coincide with minimal precipitation. Although the responses of these species to flooding have been examined extensively, their re...

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Veröffentlicht in:Annals of Botany. - Oxford University Press. - 105(2010), 1, Seite 129-139
1. Verfasser: Parolin, Pia (VerfasserIn)
Weitere Verfasser: Lucas, Christine, Piedade, Maria Teresa F., Wittmann, Florian
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2010
Zugriff auf das übergeordnete Werk:Annals of Botany
Schlagworte:Environmental studies Physical sciences Biological sciences
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520 |a • Background Rood-tolerant tree species of the Amazonian floodplain forests are subjected to an annual dry period of variable severity imposed when low river-water levels coincide with minimal precipitation. Although the responses of these species to flooding have been examined extensively, their responses to drought, in terms of phenology, growth and physiology, have been neglected hitherto, although some information is found in publications that focus on flooding. • Scope The present review examines the dry phase of the annual flooding cycle. It consolidates existing knowledge regarding responses to drought among adult trees and seedlings of many Amazonian floodplain species. • Main Findings Flood-tolerant species display variable physiological responses to dry periods and drought that indicate desiccation avoidance, such as reduced photosynthetic activity and reduced root respiration. However, tolerance and avoidance strategies for drought vary markedly among species. Drought can substantially decrease growth, biomass and photosynthetic activity among seedlings in field and laboratory studies. When compared with the responses to flooding, drought can impose higher seedling mortality and slower growth rates, especially among evergreen species. Results indicate that tolerance and avoidance strategies for drought vary markedly between species. Both seedling recruitment and photosynthetic activity are affected by drought, • Conclusions For many species, the effects of drought can be as important as flooding for survival and growth, particularly at the seedling phase of establishment, ultimately influencing species composition. In the context of climate change and predicted decreases in precipitation in the Amazon Basin, the effects of drought on plant physiology and species distribution in tropical floodplain forest ecosystems should not be overlooked. 
540 |a © Annals of Botany Company 2010 
650 4 |a Environmental studies  |x Atmospheric sciences  |x Meteorology  |x Meteorological phenomena  |x Weather  |x Weather conditions  |x Drought 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Landforms  |x Fluvial landforms  |x Alluvial landforms  |x Alluvial plains  |x Floodplains 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Dendrology  |x Trees 
650 4 |a Physical sciences  |x Earth sciences  |x Hydrology  |x Floods 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Forest ecology 
650 4 |a Biological sciences  |x Biology  |x Developmental biology  |x Growth and development  |x Developmental stages  |x Seedlings 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plants 
650 4 |a Biological sciences  |x Biology  |x Biological taxonomies  |x Species 
650 4 |a Biological sciences  |x Ecology  |x Population ecology  |x Synecology  |x Biocenosis  |x Plant communities  |x Forests  |x Tropical forests 
650 4 |a Biological sciences  |x Biology  |x Physiology  |x System physiology  |x Ecophysiology  |x Plant adaptations and microbial processes in wetlands  |x REVIEW 
655 4 |a research-article 
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700 1 |a Piedade, Maria Teresa F.  |e verfasserin  |4 aut 
700 1 |a Wittmann, Florian  |e verfasserin  |4 aut 
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