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Squeezing Out Dune Plants: Coastal Erosion, Global Sea-level Rise, And The Loss Of Sand Dune Plant Habitats

Date:
September 23, 2005
Source:
Ecological Society of America
Summary:
Researchers from Texas A&M University created a model to better understand the impacts of development and coastal erosion on plant communities, including plants that grow in the ever-shrinking strip of habitat between land and the ocean. Rusty Feagin, Douglas Sherman, and William Grant simulated varying levels of sea-level rise to understand the effects of erosion and development on sand dune plants. Their research appears in the September issue of Frontiers in Ecology and the Environment.

Researchers from Texas A&M University created a model to betterunderstand the impacts of development and coastal erosion on plantcommunities, including plants that grow in the ever-shrinking strip ofhabitat between land and the ocean. Rusty Feagin, Douglas Sherman, andWilliam Grant simulated varying levels of sea-level rise to understandthe effects of erosion and development on sand dune plants. Theirresearch appears in the September issue of Frontiers in Ecology and theEnvironment.

In most circumstances, as coastlines erode, plant communitiesare displaced away from the ocean, unless blocked by a barrier, such asa cliff. In areas like Galveston Island, natural cliffs are not theissue, but development and non-native lawns block the plants'migration.

Creating models to explore low, medium, and high increases insea levels for Galveston Island, Feagin and colleagues found that thecombination of human-created barriers and sea level rise trapped plantsin a small zone, altering the plant population as well as the dunestructure.

Larger, sturdier plants -- late-succession species -- are themost important to preserve, yet these are the most likely species to belost. These plants are critical in the formation of dunes, bindingsediments, and reducing erosion, both in the long term and duringevents such as hurricanes. They also provide critical habitat forendangered animals such as the Kemp's ridley sea turtle (Lepidochelyskempii).

According to the scientists, in a low sea-rise scenario, plantcommunities fully developed over five years, but in cases of moderateand high sea level rise, plant communities were too stressed to grow inmany areas, leading to smaller dunes and an eventual breakdown of duneformation. In the higher water scenarios, the plant populations nolonger provided windblocks, elevated dune structures, or added to thesand and soil fertility.

On Galveston Island, "the loss of such species is alreadyoccurring, where sea oats (Uniola paniculata) have disappeared due to acombination of human-induced disturbance and climate change," say theresearchers.

All this means faster erosion and less protection for the people, animals, and buildings on Galveston Island.

###

Also appearing in the September issue of Frontiers:

- Researchers from the United States propose a way to encouragethe growth and size of Everglades tree islands in the review,"Maintaining tree islands in the Florida Everglades: nutrientdistribution is the key."

- Scientists discuss the Endangered Species Act in "Recoveryof imperiled species under the Endangered Species Act: the need for anew approach."


Story Source:

The above story is based on materials provided by Ecological Society of America. Note: Materials may be edited for content and length.


Cite This Page:

Ecological Society of America. "Squeezing Out Dune Plants: Coastal Erosion, Global Sea-level Rise, And The Loss Of Sand Dune Plant Habitats." ScienceDaily. ScienceDaily, 23 September 2005. <www.sciencedaily.com/releases/2005/09/050923082502.htm>.
Ecological Society of America. (2005, September 23). Squeezing Out Dune Plants: Coastal Erosion, Global Sea-level Rise, And The Loss Of Sand Dune Plant Habitats. ScienceDaily. Retrieved August 30, 2014 from www.sciencedaily.com/releases/2005/09/050923082502.htm
Ecological Society of America. "Squeezing Out Dune Plants: Coastal Erosion, Global Sea-level Rise, And The Loss Of Sand Dune Plant Habitats." ScienceDaily. www.sciencedaily.com/releases/2005/09/050923082502.htm (accessed August 30, 2014).

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