2 edition of role of dispersal constraints in the assembly of salt-marsh communities found in the catalog.
role of dispersal constraints in the assembly of salt-marsh communities
Esther R. Chang
|Statement||door Esther Ryumin Chang.|
|The Physical Object|
|Pagination||144 p. :|
|Number of Pages||144|
Overall, post-dispersal processes were the strongest constraints to seedling emergence and overall population size. Canopy cover and soil phosphorus, both structuring factors in these communities, did not strongly influence population sizes of added focal species at the seedling and adult stages. Microbial dispersal mechanisms include wind, water, and hitchhiking on more mobile macrobes. Microbial dispersion is difficult to study, and little is known about its effect on microbial community assembly relative to the effect of abiotic and biotic assembly mechanisms, particularly in roots. For this reason only assembly mechanisms that fit.
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The role of dispersal constraints in the assembly of salt-marsh communities PROEFSCHRIFT ter verkrijging van het doctoraat in de Wiskunde en Natuurwetenschappen aan de Rijksuniversiteit Groningen op gezag van de Rector Magnificus, dr. Zwarts, in het openbaar te verdedigen op vrijdag 10 november om uur door Esther Ryumin Chang.
Results suggested mostly local dispersal of seeds. However, there was some evidence of long-distance dispersal occurring dur-ing storm surges in younger communities that are regularly inundated with tidal water.
The role of seed retention in constraining community development, rather than dispersal per se, is further examined. The species composition of salt-marsh communities is most strongly constrained by conditions that restrict establishment (E in Figure ).
As suggested by Keddy (), salinity tolerance is a very important filter in the assembly of salt-marsh communities. Dispersal filters also play a role but act together with establishment. community species pool impose strong constraints on community assembly (Fig.
Species composition of the vegetation and soil seed bank reflect each other along the community sequence as seed production, burial and survival in the soil are not limiting for establishment of species.
Similarity between the composition of. Title: The role of dispersal constraints in the assembly of salt-marsh communities: Author: Chang, Esther Ryumin: Thesis advisor: Bakker, Jan, Jefferies, Robert by: 4.
We conducted the field study in a back-barrier salt marsh on the Dutch island of Schiermonnikoog (53º 30' N, 6º 10' E). Five sites approximately 50 m apart were selected for the presence of three contrasting community types in close proximity (details below).
Within each site, we sowed in each community. The role of dispersal constraints in the assembly of salt-marsh communities. By Esther Ryumin Chang. Abstract. Esther Chang onderzocht de invloed van zaadverspreidingsfactoren op de soortensamenstelling binnen plantengemeenschappen op de kwelder, in het bijzonder op Schiermonnikoog.
Zij concludeert onder andere dat het grote vermogen van. Seed dispersal by small herbivores and tidal water: Are they important filters in the assembly of salt-marsh communities. Article in Functional Ecology 19(4) - August with 64 Reads.
To distinguish between these factors, we compared vegetation colonization and environmental conditions at a salt marsh created by MR at Brancaster, Norfolk, UK, with five reference marshes, varying in age from 30 to circa 6, years. After 5 years, plant communities of the MR site remained different from those in mature reference marshes.
C, E.R. (): e role of dispersal constraints in the assembly. of salt-marsh communities. Book. Jan ; salt marsh environment and community dynamics; sand dune environment and. This allowed us to determine the underlying factors of primary community assembly with the help of metacommunity theories that predict different levels of dispersal constraints and effects of the.
The study of community assembly considers the mechanisms by which local communities are formed from the species pool. Dispersal from the species pool, abiotic tolerance of colonists, and biotic interactions can all influence membership in local communities. Bakker, J.P. (): The impact of grazing on plant communities, plant populations and soil conditions on salt marshes.
— Vegetatio, – CrossRef Google Scholar. Salt marsh vegetation colonising new habitats distant from existing marshes are an ideal model to investigate metacommunity theory. We installed a set of 12 experimental salt marsh islands made from metal cages on a tidal flat in the German Wadden Sea to study the assembly of salt marsh communities in a metacommunity context.
Mathew A. Leibold's research works w citations reads, including: Evolutionary origins for ecological patterns in space. Thesis entitled "The role of dispersal constraints in the assembly of salt-marsh communites" under the supervision of Prof.
Jan P. Bakker Thesis entitled "The role of dispersal constraints in Title: Writing Consultant and Owner. Assembly of plant communities in coastal wetlands—the role of saltcedar Tamarix chinensis during early succession the effect of dispersal on community assembly is trivial as all these species are strong dispersers.
Evidence for community assembly constraints during succession in dune stack plant communities. To examine the role of dispersal in community assembly processes, we examined OTU turnover with the abundance weighted Raup–Crick metric (RC bray).
We modeled this analysis on the methods of Stegen et al. RC bray determines if OTU turnover between sites deviates from the expectations of ecological drift alone.
We first determined the. This book should probably be on the shelf of every student of mycology, and many ecologists too. For all students, this book should be a valuable resource and source of inspiration." -Daniel Henk, Imperial College Faculty of Medicine, London, in Inoculum, Vol. 59, No.
3, May Thomas E. Miller's 59 research works with 1, citations and 5, reads, including: Host and environmental determinants of microbial community structure in the marine phyllosphere. Marine Community Ecology and Conservation was written to give advanced undergraduate and graduate students a current overview of what is known about the structure, organization, and conservation of organism assemblages that live on the sea floor.
It largely focuses on advancements over the past decade since the publication of Marine Community Ecology (). Thus these herbivores are not likely to be important filters (constraints) in community assembly at this salt-marsh site on a coastal island in the Netherlands.
Key-words: endozoochory, experimental feeding trials, geese, hares, hydrochory Functional Ecology () 19, doi: /jx Introduction. 1 The relative importance of seed availability and the post‐dispersal environment in causing the distribution and abundance patterns of five halophytic forbs and a shrub was investigated across a New England salt marsh tidal gradient.
Seed traps and soil samples were used to assess the spatial pattern of seed availability across the marsh, and experimental seed additions were performed to.
Definitions. Several definitions of community assembly have been proposed, some more stringent than others. Given its central role in ecology, the study of community assembly shares historical landmarks with several other themes such as the niche, the Competitive Exclusion Principle, and species distribution over environmental gradients (see Historical Background).
Introduction. How species assemble into communities has puzzled ecologists for decades. The basic processes shaping communities and their diversity are dispersal, drift, selection, and speciation, and their interactions (Vellend ).While species are added to a species pool via speciation and dispersal, their abundances are affected by random processes (drift), deterministic.
Yinghua Zha, Eva S. Lindström, Alexander Eiler, Richard Svanbäck, Different Roles of Environmental Selection, Dispersal, and Drift in the Assembly of Intestinal Microbial Communities of Freshwater Fish With and Without a Stomach, Frontiers in Ecology and Evolution, /fevo, 8, ().
Four conceptual paradigms have been presented to describe metacommunities. Each paradigm evokes different mechanisms of community assembly to explain local species coexistence within a metacommunity and predicts changes in local community composition based on the rate of dispersal and habitat and species characteristics 5, 6.
(i) The species-sorting paradigm acts on the. Consumer trait variation may play an important role in mediating trophic dynamics. We used a series of field surveys and lab experiments to document intra‐specific trait variation in the consumer species Littoraria irrorata and to test the effects of this variation on salt marsh communities.
Consumer trait variation influenced the cascading. Results. Major environmental drivers of richness included growing degree-days, temperature, moisture and spatial or temporal heterogeneity. Variance partitioning pointed to an increase in the role of dispersal at coarser resolutions, while metacommunity structure analysis pointed to environmental filtering having an important role at all resolutions through a Clementsian assembly.
The role of ecological engineers. Assembly theory has long acknowledged that biological communities are contingent to the historical sequence of colonization–extinction dynamics, and that restoration can be viewed as an attempt to recover a natural range of community structure and dynamics that result in certain levels of ecosystem function.
INTRODUCTION. Seed dispersal by animals is a complex mutualistic interaction involving a great diversity of plant and animal species with significant ecological and evolutionary consequences for plant community structure and function (Howe and Smallwood, ; Schupp, ; Herrera, ).Vertebrates, mainly birds and mammals, are the main seed dispersers in most plant communities.
J.B. Zedler, A. Varty, in Encyclopedia of Ecology, Extent. Salt marsh area is not well inventoried. The global extent of pan, brackish, and saline wetlands is approximately km 2, or % of the total surface area and 5% of total wetland USA, the 48 conterminous states have about Mha of salt marshes, out of a total of 42 Mha of wetlands.
Ecological mechanisms influence relationships among microbial communities, which in turn impact biogeochemistry. In particular, microbial communities are assembled by deterministic (e.g., selection) and stochastic (e.g., dispersal) processes, and the relative balance of these two process types is hypothesized to alter the influence of microbial communities over biogeochemical function.
In a review, Belyea and Lancaster described three basic determinants of community assembly: dispersal constraints, environmental constraints, and internal dynamics.
They identified priority effects as a manifestation of the interaction between dispersal constraints and internal dynamics. On the one hand, β-diversity is hypothesized to reflect community assembly mechanisms that selectively limit the membership and abundance of species in communities [14,18].
For example, changes in β-diversity can result from variation in the strength of dispersal limitation [ 19 ], species-sorting due to environmental heterogeneity [ 20 ], or. Spatial patterns of seed dispersal and seedling recruitment of Corema album were examined among and within habitats to determine the quantitative importance of different dispersers in each type of habitat, and their effectiveness in carrying seeds to suitable habitats for seedling recruitment.
Gulls, blackbirds and rabbits were, respectively, the main dispersers (45%, 40% and 15% of. Bacterial communities play essential roles in estuarine marsh ecosystems, but the interplay of ecological processes underlying their community assembly is poorly understood.
Here, we studied the sediment bacterial communities along a linear gradient extending from the water-land junction toward a high marsh, using 16S rRNA gene amplicon sequencing.
At highest dispersal, all species are able to reach each of the local communities, and competitive dominance still plays the most important role, but now one species, the superior competitor in the regional species pool, will dominate all local communities. At intermediate dispersal frequencies, the dominance of the best competitor will be.
It has been hypothesized that the relative role of species dispersal in determining plant community composition and species richness changes along primary productivity and disturbance intensity gradients. Manipulative experiments with either diaspore addition or prevention are needed to validate this hypothesis.
Due to methodological constraints, diaspore prevention experiments are rarely used. and issues regarding community assembly and species diversity as well as recent discussions involving the notion of metacommunities (Leibold and MillerLeibold et al. By metacommunity, we mean a set of local communities that are linked by dispersal of multiple, and potentially interacting, species (Leibold et al.
Despite long-standing interest in elevational-diversity gradients, little is known about the processes that cause changes in the compositional variation of communities (β-diversity) across elevations. Recent studies have suggested that β-diversity gradients are driven by variation in species pools, rather than by variation in the strength of local community assembly mechanisms such as.Lack of interpatch dispersal through agricultural lands should have resulted in stronger patterns of population genetic differentiation than we actually found, particularly if we consider the long time elapsed since fragmentation occurred, the short generation time of the species (1 year) and the fact that some of the studied habitat patches.the physical stresses and disturbances that occur across salt marsh landscapes, creating the template for marsh communi- ties.
We then examine the roles that compehtion for resources, habitat modification by marsh organisms, and consumers play in generating the distributions and abundances of plants and animals across salt marsh communities.