1.   But the tide gate also increased salinity levels in the refuge, converting wide swaths of freshwater marsh into salt marsh and killing scores of cypresses and other trees.

2.   Invaders such as purple loosestrife, a beautiful flowering plant that is taking over New England freshwater marshes, are sold by nurseries for back yard use.

3.   The freshwater marshes are messed up, contaminated, he asserts, by Lake Charles processing and chemical plants and by saltwater flowing inland from the ship channel.

4.   Today, the centerpiece of Mason Neck is a freshwater marsh accessible only by foot or canoe.

5.   Babcock offers an airboat ride or nine-mile bike excursion through its prairie, freshwater marsh, piney woods and swampland in Charlotte and Lee counties.