| publications-491 |
PEER REVIEWED ARTICLE |
2013 |
Katrien Quisthoudt , Janine Adams , Anusha Rajkaran , Farid Dahdouh-Guebas , Nico Koedam , Christophe F. Randin |
Disentangling the effects of global climate and regional land-use change on the current and future distribution of mangroves in South Africa |
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10.1007/s10531-013-0478-4 |
Uncategorized |
Natural Water Bodies |
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No abstract available |
247514 |
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| publications-492 |
PEER REVIEWED ARTICLE |
2013 |
Nadia S. Santini , Quan Hua , Nele Schmitz , Catherine E. Lovelock |
Radiocarbon Dating and Wood Density Chronologies of Mangrove Trees in Arid Western Australia |
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10.1371/journal.pone.0080116 |
Uncategorized |
Natural Water Bodies |
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No abstract available |
247514 |
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| publications-493 |
PEER REVIEWED ARTICLE |
2013 |
Nadia S. Santini , Nele Schmitz , Vicki Bennion , Catherine E. Lovelock |
The anatomical basis of the link between density and mechanical strength in mangrove branches |
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10.1071/fp12204 |
Uncategorized |
Natural Water Bodies |
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Tree branches are important as they support the canopy, which controls photosynthetic carbon gain and determines ecological interactions such as competition with neighbours. Mangrove trees are subject to high wind speeds, strong tidal flows and waves that can damage their branches. The survival and establishment of mangroves partly depend on the structural and mechanical characteristics of their branches. In addition, mangroves are exposed to soils that vary in salinity. Highly saline conditions can increase the tension in the water column, imposing mechanical stresses on the xylem vessels. Here, we investigated how mechanical strength, assessed as the modulus of elasticity (MOE) and the modulus of rupture (MOR), and density relate to the anatomical characteristics of intact mangrove branches from southeast Queensland and whether the mechanical strength of branches varies among mangrove species. Mechanical strength was positively correlated with density of mangrove intact branches. Mechanical strength (MOE) varied among species, with Avicennia marina (Forssk.) Vierh. branches having the highest mechanical strength (2079 ± 176 MPa), and Rhizophora stylosa Griff. and Bruguiera gymnorrhiza (L.) Savigny ex Lam. and Poiret having the lowest mechanical strength (536.8 ± 39.2 MPa in R. stylosa and 554 ± 58.2 MPa in B. gymnorrhiza). High levels of mechanical strength were associated with reductions in xylem vessel lumen area, pith content and bark content, and positively associated with increases in fibre wall thickness. The associations between mechanical strength and anatomical characteristics in mangrove branches suggest trade-offs between mechanical strength and water supply, which are linked to tree growth and survival. |
247514 |
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| publications-494 |
PEER REVIEWED ARTICLE |
2013 |
D. Di Nitto , P. L. A. Erftemeijer , J. K. L. van Beek , F. Dahdouh-Guebas , L. Higazi , K. Quisthoudt , L. P. Jayatissa , N. Koedam |
Modelling drivers of mangrove propagule dispersal and restoration of abandoned shrimp farms |
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10.5194/bg-10-5095-2013 |
Simulation & Modeling |
Natural Water Bodies |
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Abstract. Propagule dispersal of four mangrove species Rhizophora mucronata, R. apiculata, Ceriops tagal and Avicennia officinalis in the Pambala–Chilaw Lagoon Complex (Sri Lanka) was studied by combining a hydrodynamic model with species-specific knowledge on propagule dispersal behaviour. Propagule transport was simulated using a finite-volume advection-diffusion model to investigate the effect of dispersal vectors (tidal flow, freshwater discharge and wind), trapping agents (retention by vegetation) and seed characteristics (buoyancy) on propagule dispersal patterns. Sensitivity analysis showed that smaller propagules, like the oval-shaped propagules of Avicennia officinalis, dispersed over larger distances and were most sensitive to changing values of retention by mangrove vegetation compared to larger, torpedo-shaped propagules of Rhizophora spp. and C. tagal. Directional propagule dispersal in this semi-enclosed lagoon with a small tidal range was strongly concentrated towards the edges of the lagoon and channels. Short distance dispersal appeared to be the main dispersal strategy for all four studied species, with most of the propagules being retained within the vegetation. Only a small proportion (max. 5%) of propagules left the lagoon through a channel connecting the lagoon with the open sea. Wind significantly influenced dispersal distance and direction once propagules entered the lagoon or adjacent channels. Implications of these findings for mangrove restoration were tested by simulating partial removal in the model of dikes around abandoned shrimp ponds to restore tidal hydrology and facilitate natural recolonisation by mangroves. The specific location of dike removal, (with respect to the vicinity of mangroves and independently suitable hydrodynamic flows), was found to significantly affect the resultant quantities and species of inflowing propagules and hence the potential effectiveness of natural regeneration. These results demonstrate the value of propagule dispersal modelling in guiding hydrological restoration efforts that aim to facilitate natural mangrove regeneration. |
247514 |
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| publications-495 |
PEER REVIEWED ARTICLE |
2013 |
Behara Satyanarayana , Sara Mulder , Loku Pulukkuttige Jayatissa , Farid Dahdouh-Guebas |
Are the mangroves in the Galle-Unawatuna area (Sri Lanka) at risk? A social-ecological approach involving local stakeholders for a better conservation policy |
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10.1016/j.ocecoaman.2012.10.008 |
Uncategorized |
Natural Water Bodies |
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No abstract available |
247514 |
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| publications-496 |
PEER REVIEWED ARTICLE |
2013 |
Virginia W. Wang’ondu , James G. Kairo , Jenesio I. Kinyamario , Francis B. Mwaura , Jared O. Bosire , Farid Dahdouh-Guebas , Nico Koedam |
Vegetative and reproductive phenological traits of Rhizophora mucronata Lamk. and Sonneratia alba Sm. |
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10.1016/j.flora.2013.08.004 |
Uncategorized |
Natural Water Bodies |
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No abstract available |
247514 |
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| publications-497 |
PEER REVIEWED ARTICLE |
2007 |
Koji Takayama , Mariko Tamura , Yoichi Tateishi , Tadashi Kajita |
Isolation and characterization of microsatellite loci in the red mangrove Rhizophora mangle (Rhizophoraceae) and its related species |
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10.1007/s10592-007-9475-z |
Uncategorized |
Natural Water Bodies |
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No abstract available |
247514 |
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| publications-498 |
PEER REVIEWED ARTICLE |
2013 |
T. Van der Stocken , D. J. R. De Ryck , T. Balke , T. J. Bouma , F. Dahdouh-Guebas , N. Koedam |
The role of wind in hydrochorous mangrove propagule dispersal |
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10.5194/bg-10-3635-2013 |
Uncategorized |
Uncategorized |
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Abstract. Although wind has been recognized to be an important factor in the dispersal of hydrochorous mangrove propagules, and hence in the quantification of (meta)population dynamics, the species-specific sensitivity to wind effects has not been studied. We combined observations from a controlled experiment (flume tank) and in situ experiments to understand wind and water current contributions to dispersal potential as well as to estimate real dispersal ranges due to immediate response to tidal currents (two outgoing tides). This was done for 4 species with propagules differing in morphological and buoyancy properties (i.e. Rhizophora mucronata, Ceriops tagal, Heritiera littoralis and Xylocarpus granatum). The flume experiments revealed that the influence of wind depends on the density of a propagule (and hence its buoyancy characteristics) and that typical morphological characteristics of the dispersal unit are additionally important. H. littoralis propagules were influenced most, because on the one hand their low density (613.58 g L−1; n =10) enables them to float on top of the water surface, and on the other hand their "sailboat-like" structure provides a relatively large surface area. The X. granatum fruits appeared to be the least influenced by ambient wind conditions, explained by the smooth surface and spherical shape of which, because of the fruit's high density (890.05 g L−1; n = 1), only a small part sticks above the water surface. Although the seeds of X. granatum are of a similar size class than H. littoralis propagules, they are (like the X. granatum fruits) largely submerged due to their high density (870.66 g L−1; n = 8), hence catching less wind than H. littoralis propagules. The influence of wind on the dispersal of the horizontally floating C. tagal and R. mucronata dispersal units was strong, comparable to that of H. littoralis propagules. A differential effect of wind was found within elongated propagules, which directly follows from the floating orientation of the propagules. While the dispersal path of vertically floating propagules was influenced by the strength and direction of the water currents and to a lesser extent by ambient wind conditions, the dispersal path of horizontally floating propagules was influenced by both strength and direction of the water currents and prevailing wind forces. To validate the flume results, propagules of C. tagal and R. mucronata were released during outgoing tide in a tidal creek in Gazi Bay (Kenya), followed by observation of their dispersal distance and direction, while knowing the actual dominant wind direction. In line with the flume results, this study showed that wind plays an important role in the dispersal distance of the propagules. The present study provides important mechanistic insight into the effect of wind on hydrochorous mangrove propagule dispersal, thereby yielding an essential step towards the construction and optimization of (particle-based) hydrodynamic dispersal models. |
247514 |
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| publications-499 |
PEER REVIEWED ARTICLE |
2013 |
Renske Hijbeek , Nico Koedam , Md Nabiul Islam Khan , James Gitundu Kairo , Johan Schoukens , Farid Dahdouh-Guebas |
An Evaluation of Plotless Sampling Using Vegetation Simulations and Field Data from a Mangrove Forest |
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10.1371/journal.pone.0067201 |
Simulation & Modeling |
Natural Water Bodies |
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No abstract available |
247514 |
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| publications-500 |
PEER REVIEWED ARTICLE |
2013 |
Ilka C. Feller , Anne H. Chamberlain , Cyril Piou , Samantha Chapman , Catherine E. Lovelock |
Latitudinal Patterns of Herbivory in Mangrove Forests: Consequences of Nutrient Over-Enrichment |
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10.1007/s10021-013-9678-8 |
Simulation & Modeling |
Natural Water Bodies |
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No abstract available |
247514 |
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