A5011815706- Coastal wetland ecosystem dynamics
- Plant responses to water stress
- Coastal and Marine Dynamics
- Plant Stress Responses and Tolerance
- Marine and coastal plant biology
- Geology and Paleoclimatology Research
- Aeolian processes and effects
- Cassava research and cyanide
- Peatlands and Wetlands Ecology
- Ecology and Vegetation Dynamics Studies
- Plant and Fungal Species Descriptions
- Hydrology and Sediment Transport Processes
- Botany, Ecology, and Taxonomy Studies
- Legume Nitrogen Fixing Symbiosis
- Tropical and Extratropical Cyclones Research
- Plant nutrient uptake and metabolism
- Rice Cultivation and Yield Improvement
- Oil Palm Production and Sustainability
- Constructed Wetlands for Wastewater Treatment
- Fire effects on ecosystems
- Geological formations and processes
- Aquaculture Nutrition and Growth
- Water Quality and Resources Studies
- Flood Risk Assessment and Management
- Plant Water Relations and Carbon Dynamics
United States Geological Survey
2012-2023
U.S. Geological Survey, Wetland and Aquatic Research Center
2015-2023
University of British Columbia
2012
Pacific Island Ecosystems Research Center
2009
MVZ - Kurfürstendamm
2007
KDDI (Japan)
2007
Louisiana State University
1989-2003
Southern Illinois University Carbondale
2001
The University of Texas at Dallas
1998
United States Department of the Army
1995
Abstract Aim To reassess the capacity of mangroves for ecosystem services in light recent data. Location Global mangrove ecosystems. Methods We review four long‐standing roles mangroves: (1) carbon dynamics – export or sink; (2) nursery role; (3) shoreline protection; (4) land‐building capacity. The origins pertinent hypotheses, current understanding and gaps our knowledge are highlighted with reference to biogeographic, geographic socio‐economic influences. Results role as C sinks needs be...
ABSTRACT Aim The long‐term stability of coastal ecosystems such as mangroves and salt marshes depends upon the maintenance soil elevations within intertidal habitat sea level changes. We examined rates processes peat formation by Caribbean Region to better understand biological controls on stability. Location Mangrove‐dominated islands coasts Belize, Honduras Panama were selected study sites. Methods Biological controlling mangrove manipulated (in Belize) addition nutrients (nitrogen or...
1 We measured sediment elevation and accretion dynamics in mangrove forests on the islands of Guanaja Roatan, Honduras, impacted by Hurricane Mitch 1998 to determine if collapse underlying peat was occurring as a result mass tree mortality. Little is known about balance between production decomposition soil organic matter maintenance with biogenic soils. 2 Sediment change rod surface table from 18 months 33 after storm differed significantly among low, medium high wind impact sites. Mangrove...
The aerenchyma (air-space) tissue in the wetland macrophyte Spartina alterniflora conveys sufficient oxygen to roots for predominately aerobic respiration moderately, but not highly, reduced substrates. Continuously flooded plants survive by respiring anaerobically, although growth is decreased. Two metabolic adaptations flooding are displayed this species, depending on degree of soil reduction.
1 The distributions of two dominant mangrove species in a neotropical forest were associated with spatial variation soil redox potentials (Eh) and interstitial water sulphide concentrations. Mangrove zones dominated by Rhizophora mangle L. alone or combination Avicennia germinans (L.) characterized moderately reducing soils (Eh = 100-300 mV) low concentrations (< 0.3 gM), whereas zone A. had strongly < -100 high (2-4 mM). 2 Less conditions near the aerial roots both indicated that...
Hydrogen sulfide, a phytotoxin that often accumulates in anoxic marine and freshwater marsh soils, suppressed the activity of alcohol dehydrogenase (ADH), enzyme catalyzes terminal step alcoholic fermentation, roots two wetland macrophytes. This inhibition root ADH with increasing sulfide concentration was associated decreases total adenine nucleotide pool (ATP + ADP AMP), adenylate energy charge ratio (AEC), nitrogen uptake (percent recovery 15 NH 4 ‐N) growth (leaf elongation). These...
Tidal wetlands experiencing increased rates of sea-level rise (SLR) must increase soil elevation gain to avoid permanent conversion open water. The maximal rate SLR that these ecosystems can tolerate depends partly on mineral sediment deposition, but the accumulation organic matter is equally important for many wetlands. Plant productivity drives dynamics and sensitive global change factors, such as rising atmospheric CO(2) concentration. It remains unknown how will influence mechanisms...
Summary Macrofaunal leaf consumption and degradation of leaves, woody twigs roots were studied in mangrove island forests on a Belizean island. Factors influencing accumulation organic matter deposited both above below ground this oligotrophic, autochothonous system assessed. Leaf rates Rhizophora mangle (red mangrove), Avicennia germinans (black mangrove) Laguncularia racemosa (white measured mesh bags, much faster the lower than upper intertidal zone. Mass loss was most rapid A. but zonal...
Soil redox potentials and pore water sulfide concentrations on a mangrove island in the Belizean barrier reef system were significantly correlated with presence of aerial roots trees. Sulfide three to five times lower near prop Rhizophora mangle (red mangrove) pneumatophores Avicennia germinans (black than adjacent (≤ 1 meter away) unvegetated sediment. also higher roots. A comparison two species revealed that rhizosphere R. as low A. germinans. However, areas occupied by black variable...
SUMMARY (1) Transplantation of streamside Spartina alterniflora swards into the more waterlogged and less productive inland marsh caused rapid decreases in soil redox potential increases interstitial water sulphide NH4 concentrations root alcohol dehydrogenase activity. (2) One year later, standing crops these transplanted were significantly reduced compared to their controls. (3) Reciprocal transplantation from resulted amelioration detrimental conditions associated with an increase crop...
Abstract Forest structure of mangrove restoration sites (6 and 14 years old) at two locations (Henderson Creek [HC] Windstar [WS]) in southwest Florida differed from that mixed‐basin forests (>50 with which they were once contiguous. However, the younger site (HC) was typical natural, developing forests, whereas older (WS) less well developed low structural complexity. More stressful physicochemical conditions resulting incomplete tidal flushing (elevated salinity) variable topography...
ABSTRACT Aims Extensive dieback of salt marsh dominated by the perennial grass Spartina alterniflora occurred throughout Mississippi River deltaic plain during 2000. More than 100,000 ha were affected, with 43,000 severely damaged. The aim this work was to determine if sudden could have been caused a coincident drought and assess significance event respect long‐term changes in coastal vegetation. Location Multiple sites reference established along 150 km shoreline Louisiana, USA. Methods...
Summary Dwarf stands of the mangrove Rhizophora mangle L. are extensive in Caribbean. We fertilized dwarf trees Almirante Bay, Bocas del Toro Province, north‐eastern Panamá with nitrogen (N) and phosphorus (P) to determine (1) if growth limitations due nutrient deficiency; (2) what morphological and/or physiological factors underlie growth. Shoot was 10‐fold when P twofold N fertilization, indicating that stunted these mangroves is partially deficiency. Growth enhancements caused by or...