. The ecology of delta marshes of coastal Louisiana : a community profile. Marsh ecology -- Louisiana; Wetlands -- Louisiana. (0 > 3 O. 20 40 60 80 100 BOTTOM EXPOSURE (%) Figure 73. year that equal or bottom exposure, of 43 ponds and Cumulative number of days per ponds in the study area will exceed certain percentages of Based on depth contours 20 years of tide data on the 1979 central Louisiana coast (Chabreck Chabreck (1975) questioned the value of most of this effort. However, he acknowledged that burning can be useful to remove a heavy vegetation thatch to allow annual species to germi
. The ecology of delta marshes of coastal Louisiana : a community profile. Marsh ecology -- Louisiana; Wetlands -- Louisiana. (0 > 3 O. 20 40 60 80 100 BOTTOM EXPOSURE (%) Figure 73. year that equal or bottom exposure, of 43 ponds and Cumulative number of days per ponds in the study area will exceed certain percentages of Based on depth contours 20 years of tide data on the 1979 central Louisiana coast (Chabreck Chabreck (1975) questioned the value of most of this effort. However, he acknowledged that burning can be useful to remove a heavy vegetation thatch to allow annual species to germinate and to give three-cornered grass an earlier start during the growing season. Burning is widely practiced to attract snow geese to an area. Trappers find burned areas inuch easier walking, and animal trails are much more noticeable. However^ nutria and raccoon often move from a burned marsh because of the lack of adequate cover. Water Quality Water quality is a major issue in Louisiana wetlands as in inany other areas of the country, but it has received relatively little attention, probably because the much more pressing issue of marsh loss has taken the spotlight. The source of delta sediments, the Mississippi River itself, is heavily polluted with exotic chenicals which become incorporated in the sediments of any marshes created. because of hydrocarbon strength; it reintroduced 1975). here they can be magnified into chain, leading to the kind of species that pelican. That from the del ta of chlorinated on egg shell recently been From the food effects on individual occurred with the brown s|-iecies was extirpated the effect pesticides has only from Florida (Blus et al Local runoff from urban and agricultural areas is also a serious problem. Seaton and Day (1979), Seaton and Day (1980), and Kemp (1973) documented the effects of urban runoff from the New Orleans area into the Sarataria basin and Lake Pontchartrain. Gael and Hopkinson (1979) showed that eutrophication of wate
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