Changes in aspects of emergent and submerged vegetation cover, richness, and diversity in a fragmenting marsh system

Habitat fragmentation is a global environmental challenge, and the marshes of southeastern Louisiana are a hotspot for habitat fragmentation. Evaluating marsh ecosystems during the transition from intact to fragmented is critical to predict future changes and inform effective conservation and restoration plans. We sampled three sites in Terrebonne Basin, Louisiana to characterize a fragmenting emergent-vegetation dominated system, investigate the relationship between plant species richness and diversity and marsh fragmentation, and determine the relationship between marsh fragmentation and cover of submerged aquatic vegetation (SAV). Emergent plant richness and diversity were higher in areas with low salinity and high surface elevation. Although these areas had relatively low fragmentation, there was no direct relationship between richness or diversity and measures of marsh fragmentation. Despite greater light availability in highly fragmented areas, SAV was restricted to areas with low...