A5089438729- Coastal wetland ecosystem dynamics
- Plant Water Relations and Carbon Dynamics
- Plant responses to water stress
- Tree-ring climate responses
- Forest ecology and management
- Coastal and Marine Dynamics
- Wood Treatment and Properties
- Geology and Paleoclimatology Research
- Wood and Agarwood Research
- Oil Palm Production and Sustainability
- Forest Management and Policy
- Coastal and Marine Management
- Marine and coastal plant biology
- Plant nutrient uptake and metabolism
- Ecology and Vegetation Dynamics Studies
- Species Distribution and Climate Change
- Medieval Architecture and Archaeology
- Aging, Elder Care, and Social Issues
- Cultural Identity and Heritage
- Sustainability and Ecological Systems Analysis
- Linguistic and Sociocultural Studies
- Soviet and Russian History
- Soil and Land Suitability Analysis
- Ecosystem dynamics and resilience
- Aquatic life and conservation
Centre for Research on Ecology and Forestry Applications
2016-2020
Royal Museum for Central Africa
2007-2019
Vrije Universiteit Brussel
2007-2019
Centre for Ecological Research
2016
University of Lisbon
2015
Centre Méditerranéen de Médecine Moléculaire
1997
Fonds National de la Recherche
1984
Abstract Tree mortality is a key factor influencing forest functions and dynamics, but our understanding of the mechanisms leading to associated changes in tree growth rates are still limited. We compiled new pan‐continental tree‐ring width database from sites where both dead living trees were sampled (2970 4224 190 sites, including 36 species), compared early recent between that died those survived given event. observed decrease radial before death ca. 84% events. The extent duration these...
Abstract Severe droughts have the potential to reduce forest productivity and trigger tree mortality. Most trees face several drought events during their life therefore resilience dry conditions may be crucial long-term survival. We assessed how growth severe droughts, including its components resistance recovery, is related ability survive future by using a tree-ring database of surviving now-dead from 118 sites (22 species, >3,500 trees). found that, across variety regions species...
Tree mortality is a key driver of forest dynamics and its occurrence projected to increase in the future due climate change. Despite recent advances our understanding physiological mechanisms leading death, we still lack robust indicators risk that could be applied at individual tree scale. Here, build on previous contribution exploring differences growth level between trees died survived given event assess whether changes temporal autocorrelation, variance, synchrony time-series annual...
Phloem osmolality and its components are involved in basic cell metabolism, growth, various physiological processes including the ability of living cells to withstand drought frost. Osmolality sugar composition responses environmental stresses have been extensively studied for leaves, but less secondary phloem plant stems branches. Leaf osmotic concentration share pinitol raffinose among soluble sugars increase with increasing or cold stress, is adjusted osmoregulation. We hypothesize that...
Summary Wood anatomical characteristics are an important source of information about how trees coping with the conflicting requirements optimal hydraulic conductivity and safety. In this study we compared vessel Avicennia marina Rhizophora mucronata to contribute a better understanding difference in distribution these two mangrove species. Density, grouping diameters vessels together element length A. growing on seven different sites Gazi Bay (Kenya) were measured R. same research area....
Background Secondary growth by successive cambia is a rare phenomenon in woody plant species. Only few species, within different phylogenetic clades, have secondary more than one vascular cambium. Often, these are organised concentrically. In the mangrove genus Avicennia however, seem to complex organisation. This study aimed (i) at understanding development of giving three-dimensional description hydraulic architecture and (ii) unveiling possible adaptive nature through ecological...
Spring flooding in riparian forests can cause significant reductions earlywood-vessel size submerged stem parts of ring-porous tree species, leading to the presence 'flood rings' that be used as a proxy reconstruct past events, potentially over millennia. The mechanism flood-ring formation and relation with timing duration are still elucidated. In this study, we experimentally flooded four-year-old Quercus robur trees at three spring phenophases (late bud dormancy, budswell internode...
OPINION article Front. Plant Sci., 21 July 2016Sec. Functional Ecology Volume 7 - 2016 | https://doi.org/10.3389/fpls.2016.01069
Secondary growth via successive cambia has been intriguing researchers for decades. Insight into the mechanism of layer formation is, however, limited to cellular level. The present study aims clarify secondary in mangrove species Avicennia marina on a macroscopic level, addressing network as whole. In addition, previously suggested effects salinity were reconsidered. A 1-year cambial marking experiment was performed 80 trees from eight sites two forests Kenya. Environmental (soil water and...
Tree mortality is a key process shaping forest dynamics. Thus, there growing need for indicators of the likelihood tree death. During last decades, an increasing number tree-ring based studies have aimed to derive growth-mortality functions, mostly using logistic models. The results these studies, however, are difficult compare and synthesize due diversity approaches used sampling strategy (number characteristics alive death observations), type explanatory growth variables included (level,...
Some of the most striking features Rhizophoraceae mangrove saplings are their voluminous cylinder-shaped hypocotyls and thickened leaves. The known to serve as floats during seed dispersal (hydrochory) store nutrients that allow seedling root settle. In this study we investigate what degree leaves can water reservoirs once seedlings have settled, helping plant buffer rapid potential changes typical for environment. We exposed two species three levels salinity (15, 30 0-5 ‰, in sequence)...
Successive vascular cambia are involved in the secondary growth of at least 200 woody species from >30 plant families. In mangrove Avicennia these successive organized patches, creating stems with non-concentric xylem tissue surrounded by internal phloem tissue. Little is known about radial and tree stem dynamics trees this type anatomy. This study aims to (1) clarify process studying its patchiness; (2) increment stems, both temporary permanent, relation local climatic environmental...
Insect infestation of mangroves currently threatens mangrove forest health and management. In the Western Indian Ocean region, little is known about insect damage to despite fact that numerous infestations have occurred. Kenya, Sonneratia alba persisted for almost two decades, yet taxonomic identity infesting pest(s), extent infestation, pests' biology, impacts on host ecosystem, host's defensive strategies are poorly understood. S. a ubiquitous, pioneer species Indo-Pacific, occurring along...
Summary Trees scale leaf ( A L ) and xylem X areas to couple transpiration carbon gain with water transport. Some species are known acclimate in : balance response climate conditions, but whether trees of different similar ways over their entire (continental) distributions is unknown. We analyzed the effects on scaling vs branches conifers Pinus sylvestris , Picea abies broadleaved Betula pendula Populus tremula sampled across a continental wide transect Europe. Along branch axis, change...
Abstract Sedimentation results in the creation of new mudflats for mangroves to colonize among other benefits. However, large sediment input mangrove areas may be detrimental these forests. The dynamics phenological events three tree species ( Avicennia marina , Ceriops tagal, and Rhizophora mucronata ) were evaluated under experimental burial simulating sedimentation levels 15, 30, 45 cm. While there was generally no shift timing with sedimentation, each responded differently treatments....
Intervessel pits are prominent wall structures involved in the water transport mechanism of land plants. The role their intra-tree variation regulation transport, however, remains enigmatic. hypothesis was tested that pit membrane thickness and degree impregnation with phenolic substances increase along stem axis increasing tension on column as an adaptation to higher risk for cavitation. Wood samples were taken at different heights from mangrove tree Rhizophora mucronata growing Gazi Bay...
Shrubs and trees with secondary phloem tissue produced by successive cambia mainly occur in habitats characterized a periodical or continuous lack of water availability. The amount this stems Avicennia rises increasing soil salinity decreasing inundation frequency. Hence, increased storage was put forward to be advantageous harsh environmental conditions. It however never tested whether the cells over entire stem woody species showing wood anatomical feature are indeed water-filled as...