Habitat and Geography

     Patera appressa
lives in a select few habitats and only in specific ecological niches, as this snail occupies a relatively small area.  The snails in Canada were found in a Northern White Cedar Forest, which has a rocky hillside (Nekola, 2009)Patera appressa ordinarily lives in a forest or woodland habitat but they need to be mesic forests, meaning an adequate amount of water and moisture to support healthy snail life opposed to xeric areas, which will not allow for reproduction to occur (Turgeon, 1998).  The adequate amount of moisture is kept on the surface floor of the forest due to trees making a full canopy to prevent light penetration (mass.gov, 2007). 
     The nutrient rich mesic forests are only found on slopes at relatively low to moderate elevations where calcareous bedrock occurs (mass.gov, 2007).  Coincidentally, the vast majority of snail population with carbonate cliffs have a calcareous substrate layer (Nekola, 2009).  This could help explain why the area of this snail is relatively small.  Patera appressa is found most often in river bluffs or rocky areas, but they are not alone (Hubricht, 1985)

      There are numerous other species that live in mesic forests.  They include a wide array of common birds, moths, and plants, as well as rare species that can only maintain live in mesic habitat (Basile, 2005).  The most common trees that make up the canopy are sugar maple, which are the most dominant, followed by basswood and white ash (nhdfl.org, 2012).  The herbaceous ground layer is made up by a variety of sedges, mosses, ferns, buttercups, and lilies depending on the time of year, present conditions, or time of year (mass.gov, 2007).  Mesic forests also contain rare plant species such as Dryopteris goldiana, which is the Goldie's fern (nhdfl.org, 2012).  Other animals can also be found living here too, such as salamanders, other snails, snakes, turtles, and a wide array of birds (mass.gov, 2007).        

     Patera appressa
lives in regions only with the supported habitat mentioned above.  These occur in small parts of the United States, Canada, and the United Kingdom.  In North America, Patera appressa lives as far north as Lake Trenton in Ontario, Canada and as far south as Alabama (Nekola, 2009).  This includes the rocky areas of the Appalachian mountain range in Tennessee, North and South Carolina, Kentucky, Virginia, Maryland, West Virginia, Ohio, and even parts outside of the mountain range in Indiana and Illinois.  Patera appressa is also found off the coast of the United States in the islands of Bermuda.  According to the research by Nekola, the Patera appressa snail habitat globally spans between 80,000 and 1,000,000 square miles (Nekola, 2009).    


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