. The ecology of delta marshes of coastal Louisiana : a community profile. Marsh ecology -- Louisiana; Wetlands -- Louisiana. Figure 58. Major duck migration coast marshes (Bellrose 1980). corridors to gulf Bird populations sre largest during the winter when ducks and geese are abundant. It is misleading to group all these species, however, as sone migrate on through to South America, as shown for the pintail and teals. These two species reach peak abundance late in the year and again in the spring, apparently because a large proportion of the population moves south across the gulf in mid-wint
. The ecology of delta marshes of coastal Louisiana : a community profile. Marsh ecology -- Louisiana; Wetlands -- Louisiana. Figure 58. Major duck migration coast marshes (Bellrose 1980). corridors to gulf Bird populations sre largest during the winter when ducks and geese are abundant. It is misleading to group all these species, however, as sone migrate on through to South America, as shown for the pintail and teals. These two species reach peak abundance late in the year and again in the spring, apparently because a large proportion of the population moves south across the gulf in mid-winter. Wading bird densities in the marsh peak during the summer. Although they are year-round residents, they appear to be much more active in marshy areas during the summer (Mabie 1975). About 60 species of land birds, mostly songbirds, migrate through the delta to South America each year. They do not use the marsh exten- sively, but usually fly over it. However, during northward spring migrations they frequently encounter strong head winds and take refuge on the first landing sites, the cheniers and slightly elevated marsh ridges. During these occasions their densities can be very high, and the marshes can be important for their sur- vival. Some of these songbirds, like the red-winged blackbird and the great-tailed grackle, nest in the coastal marshes in 82. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gosselink, James G; National Coastal Ecosystems Team (U. S. ). Washington, DC : National Coastal Ecosystems Team, Division of Biological Services, Research Development, Fish and Wildlife Service, U. S. Dept. of the Interior : Corps of Engineers, U. S. Dept. of the Army
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