. The ecology of delta marshes of coastal Louisiana : a community profile . LEVEE REPAIRS WEST SIDE SOME FLAP-GATE CULVERTS PLUGGED FLAP-GATE STRUCTURES i ALL FLAP-GATE CULVERTS REMOVED SEPT 1965 SEVERE MARSH BURN FOLLOWED BY HIGH SALINE TIDES CAUSED MARSH LOSS O 80- M ^iufliuil MANAGEMENT EVENTS iUMil 1 1965- LEVEES CONSTRUCTED METAL FLAP-GATE CULVERTS INSTALLED VEAR FmP- GATE CULVERTS LEAKING WOODEN BOX FLAP- GATES INSTALLED MANAGEMENT EVENTS CONCRETE VARIABLE CREST REVERSIBLE LEVEE REPAIRS - EASTSIOE SOME FLAP-GATE CULVERTS PLUGGED FLAP GATE STRUCTURES' ALL FLAP-GATE CULVERTS REMOVED. WOODE
. The ecology of delta marshes of coastal Louisiana : a community profile . LEVEE REPAIRS WEST SIDE SOME FLAP-GATE CULVERTS PLUGGED FLAP-GATE STRUCTURES i ALL FLAP-GATE CULVERTS REMOVED SEPT 1965 SEVERE MARSH BURN FOLLOWED BY HIGH SALINE TIDES CAUSED MARSH LOSS O 80- M ^iufliuil MANAGEMENT EVENTS iUMil 1 1965- LEVEES CONSTRUCTED METAL FLAP-GATE CULVERTS INSTALLED VEAR FmP- GATE CULVERTS LEAKING WOODEN BOX FLAP- GATES INSTALLED MANAGEMENT EVENTS CONCRETE VARIABLE CREST REVERSIBLE LEVEE REPAIRS - EASTSIOE SOME FLAP-GATE CULVERTS PLUGGED FLAP GATE STRUCTURES' ALL FLAP-GATE CULVERTS REMOVED. WOODEN BOX FLAP-GATE CULVERTS PLUGGED VEAR METAL FLAP-GATE CULVERTS MAINTAINED AS PERMANTLV FLOODED FRESHWATER IMPOUNDMENT BEGAN SPRING AND SUMMER DRAW-DOWN DROUGHT FLOODED IN SUMMER FOR MOTTLED DUCK NESTING DOUBLE DIVERGENT . PUMPING UNIT Figure 74. The percentage of different types of vegetation Rockefeller State Wildlife Refuge (Wicker et al. 1983). in impoundments in the from the effect of the associated dense network of canals and spoil banks, but the density of marsh grass culms and average height was lower than in control areas (R. E. Turner; pers. comm.). Amphipods, total crustaceans, and total benthic organisms were reduced 50 percent compared to non-oilfield control areas (Lindstedt 1978). Killifish abundance was substantially less in oil- field marsh ponds than at control sites, although not statistically so because of the large confidence limits. However, the fecundity of Fundulus grandis in oilfield marshes was significantly lower than at control sites, especially the condition index of females 61-80 mm long (May 1977). It is apparent that we need to know much more about the effects of chronic low-level oilspills. From a management point of view,water pollution is a good example of the need to manage on many different levels. Water quality of the Mississippi River must be improved. This is a problem national in scope because of the river's enormous watershed. The contro
Size: 2678px × 1866px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbio, booksubjectwetlandslouisiana
