Nutria feeding activity and its effect on marsh vegetation in southwestern Louisiana
U.S. Fish and Wildlife Service, 1962 - Nature - 53 pages
A study of the effect of nutria on marsh vegetation was made in southwestern Louisiana from 1954 to 1956 by means of plant transects, exclosures, and indices to nutria abundance. Plant species studied included saltmeadow cordgrass, Olney's three-square, big cordgrass, reed, and sawgrass. Nutria had a pronounced effect, except for limited areas, only on big cordgrass. It is concluded that nutria did not have a major effect on the marsh vegetation as a whole, and did not create extensive bare areas. It is pointed out that the marsh habitat is dynamic and complex and many factors are undoubtedly involved in the changes that have occurred.
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activity of nutria areas Average number big cordgrass stands bO bO Cameron Parish cattail CD CD cordgrass dominant coverage coypu decreased density Difference between inside effect of nutria figures 2-9 H CD habitat higher mean inside increased involved in nutria Lacassine Refuge large openings Lynch Marsh Island marsh vegetation muskrats nonvegetated ground number of culms numbers of nutria nutria abundance nutria activity nutria exclosure nutria feeding activities nutria on Transect nutria population occurred Olney's three-square type Paspalum Pecan Island percent vegetative composition plant species prob protected from nutria quadrat inside reed type reed-big cordgrass type rhizomes salinity samples each location Scirpus sect Southern bulrush southwestern Louisiana species of plants stand of big stands of reed stands on Transects trapping Trapping records type of transect vegetation first sampled vegetation inside vegetation per quadrat Vegetational changes vegetative reproduction Vermilion Bay Vermilion Parish Wildlife