. Bulletin. Science; Natural history; Natural history. ECOLOGY OF COASTAL SALT MARSH 57. Fig. 2. Bolsa Bay, 1874. Note ocean inlet. Methods To understand the effect of long-term absence of tidal fluctuation on the salt marsh system at Bolsa Bay, study was initiated in October 1977 and continued through March 1979. Concurrent investigations of other less altered southern California salt marshes (Sweetwater River, Los Penasquitos Lagoon, and Upper Newport Bay) were underway by me to provide comparative data (Eilers 1980). Vegetation A transect of five x m macroplots (BB-1 to BB-5) was lo
. Bulletin. Science; Natural history; Natural history. ECOLOGY OF COASTAL SALT MARSH 57. Fig. 2. Bolsa Bay, 1874. Note ocean inlet. Methods To understand the effect of long-term absence of tidal fluctuation on the salt marsh system at Bolsa Bay, study was initiated in October 1977 and continued through March 1979. Concurrent investigations of other less altered southern California salt marshes (Sweetwater River, Los Penasquitos Lagoon, and Upper Newport Bay) were underway by me to provide comparative data (Eilers 1980). Vegetation A transect of five x m macroplots (BB-1 to BB-5) was located within the salt marsh perpendicular to the elevation gradient along the main channel in Inner Bolsa (Fig. 1). At intervals of six to eight weeks for a period of 13 months (October 1977 through October 1978), a 20 x 50 cm quadrat frame was located within each macroplot (at a different position each session) and all above-ground vascular plant material in the frame was harvested, placed in plastic bags, then refrigerated within two hours to minimize fermentation losses (Milner and Hughes 1968). In the laboratory each sample was divided into component species. Species fractions were further divided into living and dead material. Subfractions were then dried to constant weight in a gravity convection oven at 85°C and weighed to the nearest g. Annual net production estimates for macroplots were calculated by the method of Smalley (1959) applied to component species as follows: 1) If the net change between sampling periods was positive for both the live biomass (L) and dead biomass (D), then species production in the interval was equal to the sum (AL + AD); 2) if AL and AD were negative, production was assumed to be zero; 3) if AL and AD were + and -, respectively, then species production was equal to AL; and 4) if AL and AD were - and +, respectively, species production was assumed to be equal to the sum (AL + AD) if the sum was greater than zero, and equal to zero if the
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