<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>32</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Amanda  Marsh,</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Effects on a  salt marsh ecosystem following a brown marsh event</style></title><secondary-title><style face="normal" font="default" size="100%">Biology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">VCR</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.vcrlter.virginia.edu/thesis/Amanda_Marsh_Thesis2007.pdf</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">East Carolina University</style></publisher><pub-location><style face="normal" font="default" size="100%">Greenville, NC</style></pub-location><pages><style face="normal" font="default" size="100%">152</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In summer 2004, an area of salt marsh within the Virginia Coast Reserve Long-Term Ecological Research site (USA) had little new growth of the dominant Spartina alterniflora.  This circumstance had not been noticed during more than 15 years of study of this marsh.  Similar but larger brown marsh events have been observed in Georgia, Louisiana, and other states along the Atlantic and Gulf coasts of the United States. Such events may affect marsh ecosystems in numerous ways that warrant characterization.  Permanent transects were set up through healthy (H), intermediate (I), and dieback (D) conditions of S. alterniflora to track development of the marsh in 2004 and possible subsequent recovery or long-term effects.  Subsequent evaluations of effects in 2005 and 2006 come from measurements of ground cover, bacterial and Melampus bidentatus densities, distribution of algal taxa and chlorophyll a concentrations in surface sediments, HPLC analysis of pigments in surface sediments, pore water sulfide concentrations, and elevation.  The disturbance affects the variables dependent on scale with the greatest and most long-term effects at larger scales.  Chlorophyll a concentrations were not different among the conditions and any differences in the bacterial densities may not be ecologically significant.  Snail densities and sulfide concentrations did show differences.  Hypotheses concerning expectations of response to dieback are rejected as stated originally but the differences among conditions could often be explained and understood. There were increases in healthy ground cover from 2005-2006, which indicated recovery is occurring more quickly in the smaller patches than the larger patches, but elevation and flooding may have changed preventing a full recovery.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.2007-82106</style></accession-num></record></records></xml>