A5058317423- Coastal wetland ecosystem dynamics
- Ecology and Vegetation Dynamics Studies
- Geological formations and processes
- Coastal and Marine Management
- Botany, Ecology, and Taxonomy Studies
- Soil erosion and sediment transport
- Geology and Paleoclimatology Research
- Coastal and Marine Dynamics
- Aeolian processes and effects
- Rangeland and Wildlife Management
- Rangeland Management and Livestock Ecology
- Plant and animal studies
- Botany and Plant Ecology Studies
- Marine and environmental studies
- Identification and Quantification in Food
- Soil and Water Nutrient Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Indigenous Studies and Ecology
- Plant Ecology and Taxonomy Studies
- Agricultural Economics and Policy
- Hydrology and Sediment Transport Processes
- Archaeology and ancient environmental studies
- Peatlands and Wetlands Ecology
- Digestive system and related health
- Pasture and Agricultural Systems
Experimental Station
1984-1989
University of Oxford
1968
For organisms with indeterminate growth, life history theory predicts that in environments where experience high survival rates or gain fecundity age size, natural selection favors delayed maturity.In semelparous perennial plants the onset of reproduction is regulated by a threshold size for flowering.We tested this prediction comparing sand dune populations facultative biennial herb Cynoglossum officinale.We collected data on flowering probability, survival, and growth rate relation to...
(1) A study was made of changes in the distribution and area reedswamp eighteen Broads by use aerial photographs, which covered period 1945 to 1978. Additional information obtained from c. 1880, 1905 1926 Ordnance Survey maps. (2) Between 1880 colonization, reedswamp, open water exceeded losses, succession, fen. After decreased mainly rapid succession fen, a slower rate colonization. (3) From 1946 onwards there dramatic loss reedswamp. The 121.5 ha 49-2 1977. These losses were almost...
The germination of two species salt-marsh plants Limonium vulgare Mill., and L. humile is investigated in relation to their ecology. Germination inhibited by sea water, but even fresh water low. Inhibition negatively correlated with uptake. However, a treatment stimulates subsequent water. effect the sea-water appears be one osmotic shock which weakens seed coat. Variation response partly genetical environmental. Seeds different parts will subject differing conditions, both during...
Abstract Vegetation contributes to the stability of salt marsh surface both through soil reinforcement provided by root mass and ability aerial component plant growth increase rates sediment deposition. Salt vegetation is variable in height, thickness also stiffness. These characteristics can all modify role trapping sediment. As height increases so does Manning’s ‘ n ’, coefficient roughness, but taller more easily flattened moving water. It not necessarily, therefore, effective slowing...
(1) Different combinations of nitrogen, phosphorus and potassium were added to two nutrient-poor, rabbit-grazed dune swards at Holkham, Norfolk. The plant communities included a wide range annual species with some perennial species, bryophytes lichens. complete (+NPK) mixture was also applied higher concentrations establish the effect differing rates application. (2) Because intense rabbit grazing in area, grasses did not dominate sward, only very few unpalatable perennials favoured by...
SUMMARY related to community structure and environmental factors. (2) Winter annual species had high growth rates and, except in the earliest stages, shoots showed greater increase dry weight than roots. They may have low competitive abilities depend on restriction of perennial competitors by soil-water nutrient levels. Because their an early start, however, they complete life-cycle before stress summer drought. (3) Biennial varied strategies. Some are described as strategists; others quite...
S ummary This paper compares two contrasting biennial plant species of the sand dunes Holkham, North Norfolk. A survey distribution, in relation to various habitat factors, showed that Lactuca virosa L. is characteristic tall, Ammophila‐dominated grassland on younger dunes. It favoured by gaps vegetation cover such as those produced local wind erosion, but it very sensitive rabbit grazing. Cynoglossum officinale a older dune and not normally grazed rabbits. can exploit bare ground around...
world usage. The present paper is concerned with the role of Limonium spp. in salt marsh community rather than relative status ecological subunits. selection sites for detailed study was based on presence or likely occurrence and excludes earliest communities succession. For purposes this 'salt marsh' taken to mean vegetated intertidal poorly drained soils. nomenclature follows that Clapham, Tutin & Warburg (1962). Three species occur marshes British Isles. L. vulgare commonest, it occurs...
Abstract. Much of the low‐lying farmland around coastline south‐east England was once inter‐tidal salt marsh, which subsequently reclaimed from sea and converted to farmland. It is becoming increasingly uneconomic maintain embankments protect this land sea. ‘Managed retreat’ involves relocating further inland recreating habitat in front them. Salt marsh not only provides a protective buffer for these walls by dissipating wave energy, but also important as birds source organic matter fish...
Detecting very small variations in topography is difficult. An apparatus described, using multiple pins for sensing, which permits measurements of quickly and with minimum effort.