sentences:  Examples are Empetrum nigrum, Ilex vomitoria, and Vaccinium ovatum.The shrub stage is usually the final phase and may last for short or long periods of time depending on microclimatic conditions such as distance from the shoreline, availability of groundwater, or salt spray effects..
  
  A single beach may be divided into segments with different owners.Gaining agreement among all owners complicates the process of stabilizing the dunes.