Constraints on the Establishment of Plants Along a Fluctuating Water-Depth Gradient Seabloom, Eric Moloney, Kirk van der Valk, Arnold
dc.contributor.department Botany 2018-02-17T18:23:19.000 2020-06-30T00:54:28Z 2020-06-30T00:54:28Z Mon Jan 01 00:00:00 UTC 2001 2001-08-01
dc.description.abstract <p>We used simulation modeling to investigate the relative importance of current environmental conditions and factors affecting establishment of different plant species on the formation of vegetative zonation patterns. We compared the results from a series of six models that incorporated increasing amounts of information about key factors affecting species' ability to adjust to water-level fluctuations. We assessed model accuracy using aerial photographs taken of a 10-yr field experiment, in which 10 wetlands were flooded to 1 m above normal water level for 2 yr, drawn down for 1 or 2 yr, and reflooded for 5 yr to three different water levels (normal, +0.3 m, +0.6 m). We compared each model's ability to predict relative areal cover of five dominant emergent species and to recreate the spatial structure of the landscape as measured by mean area of monospecific stands of vegetation and the degree to which the species were intermixed.</p> <p>The simplest model predicted post-treatment species distributions using logistic regressions based on initial species distributions along the water-depth gradient in the experimental wetlands. Subsequent models were based on germination, rhizomatous dispersal, and mortality functions implemented in each cell of a spatial grid. We tested the effect on model accuracy of incrementally adding data on five factors that can alter the composition and distribution of vegetative zones following a shift in environmental conditions: (1) spatial relationships between areas of suitable habitat (landscape geometry), (2) initial spatial distribution of adults, (3) the presence of ruderal species in the seed bank, (4) the distribution of seed densities in the seed bank, and (5) differential seedling survivorship.</p> <p>Because replicated, long-term data are generally not available, the evaluation of these models represents the first experimental test, of which we are aware, of the ability of a cellular-automaton-type model to predict changes in plant species' distributions.</p> <p>Establishment constraints, such as recruitment from the seed bank, were most important during low-water periods and immediately following a change in water depth. Subsequent to a drop in water level, the most detailed models made the most accurate predictions. The accuracy of all the models converged in 1–2 years after an increase in water level, indicating that current environmental conditions became more important under stable conditions than the effects of historical recruitment events.</p>
dc.description.comments <p>This article is from <em>Ecology </em>82 (2001): 2216, doi: <a href="[2216:COTEOP]2.0.CO;2" target="_blank">10.1890/0012-9658(2001)082[2216:COTEOP]2.0.CO;2</a>. Posted with permission.</p>
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dc.identifier archive/
dc.identifier.articleid 1061
dc.identifier.contextkey 8806383
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath bot_pubs/64
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 01:21:55 UTC 2022
dc.source.uri 10.1890/0012-9658(2001)082[2216:COTEOP]2.0.CO;2
dc.subject.disciplines Botany
dc.subject.disciplines Other Plant Sciences
dc.subject.disciplines Terrestrial and Aquatic Ecology
dc.subject.keywords cellular automaton
dc.subject.keywords community
dc.subject.keywords dispersal
dc.subject.keywords environmental gradient
dc.subject.keywords establishment constraints
dc.subject.keywords logistic regression
dc.subject.keywords seed bank
dc.subject.keywords spatial model
dc.subject.keywords spatial pattern
dc.subject.keywords water depth
dc.subject.keywords wetlands
dc.subject.keywords zonation
dc.title Constraints on the Establishment of Plants Along a Fluctuating Water-Depth Gradient
dc.type article
dc.type.genre article
dspace.entity.type Publication
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