Tag: Lonicera japonica

Japanese Honeysuckle—Effects on Wetland Delineations in AGCP and EMP Regions

The Swamp Stomp

Volume 14, Issue 41

In 1988 the U.S. Fish and Wildlife Service published the National Wetland Plant List (1988 NWPL), which not only listed all the plants common to wetlands in each region, but also classified them based on how frequently they occurred in wetlands under natural conditions. This 1988 listing classified Lonicera japonica, commonly known as the Japanese Honeysuckle, as a Facultative-minus (FAC-) species. Facultative (FAC) species generally have a similar likelihood of occurring in both wetlands and non-wetlands; the (+) and (–) modifiers indicate species that have a higher probability of occurring in one habitat over the other—the (+) modifier indicates species more likely to appear in wetlands, and the (–) modifier is given to species less likely to occur in wetlands. Therefore, the Japanese Honeysuckle was classified as a species that may appear in wetlands, but was unlikely to do so. As a result, it became extensive within the transitional zone between wetland and non-wetland habitats.

The U.S. Army Corps of Engineers (COE), however, updated the list in 2012. The 2012 NWPL changed the specification of the Japanese Honeysuckle in the Eastern Mountains and Piedmont (EMP) Region and in the Atlantic Gulf Coastal Plain (AGCP) Region from FAC- to FAC. This shift meant that the Japanese Honeysuckle was then classified as a wetland plant instead of a non-wetland plant.

Furthermore, this change in classification had the possibility of changing the delineation of wetlands in the EMP and AGCP regions. When the Japanese Honeysuckle occurred as a dominant species in a wetland area, there was a strong possibility of a positive dominance test for hydrophytic, or wetland, vegetation, which may have resulted in the expansion of the wetland’s boundaries.

The 2014 NWPL once again saw a change in the classification of the Japanese Honeysuckle. The Japanese Honeysuckle shifted from FAC to Facultative-Upland (FACU) in the AGCP Region. FACU species sometimes occur in wetlands—less frequently than FAC-, however—but generally occur in non-wetland habitats. Therefore, the Japanese Honeysuckle is no longer categorized as a wetland plant in the AGCP Region. Subsequently, this may result in the reduction of wetland boundaries in that region.

The Japanese Honeysuckle maintained its FAC classification in the EMP Region for a longer time than in the AGCP Region, however, its classification was altered earlier this year. March 31, 2014 saw the National Association of Home Builders (NAHB) submit a request that the classification of the Japanese Honeysuckle be changed from FAC to FACU in the EMP region. The COE responded on May 22 by listing the Japanese Honeysuckle on their website as FACU, effective immediately. The change in classification will be reflected on the 2015 NWPL, but the 2014 NWPL will remain unaltered. Now that the Japanese Honeysuckle is considered a non-wetland plant in the EMP Region, wetland delineations have the possibility of changing as the boundaries of wetlands may decrease.

The COE publishes changes to species classifications on their website, however, provides no formal public notification when revisions are made. Until such a process is implemented, the only way of finding out about classification changes is to periodically check the COE website.