. The ecology of Tijuana Estuary, California : a national estuarine research reserve. Estuarine ecology -- California Tijuana River Estuary. Li 111 Imperial Beach. Figure Sampling stations for the revised salt marsh monitoring program. Cordgrass is now monitored annually at the four northernmost stations (Peninsula. Original, E-W Channel, and Tributary). Mid- elevation and upper-elevation transects were placed at the Peninsula, Original, Near Mouth and Old River stations. Each station includes one or more transects of 20-m length. There are 4 transects for each of the habitats (lower, mi
. The ecology of Tijuana Estuary, California : a national estuarine research reserve. Estuarine ecology -- California Tijuana River Estuary. Li 111 Imperial Beach. Figure Sampling stations for the revised salt marsh monitoring program. Cordgrass is now monitored annually at the four northernmost stations (Peninsula. Original, E-W Channel, and Tributary). Mid- elevation and upper-elevation transects were placed at the Peninsula, Original, Near Mouth and Old River stations. Each station includes one or more transects of 20-m length. There are 4 transects for each of the habitats (lower, mid- and upper intertidal elevation). from the ocean inlet. The south arm of Tijuana Estuary is included in comparisons of middle and upper elevation transects. Since cordgrass is restricted to the northern arm, all four lower-marsh transects are located along Oneonta Slough. At each site, a 20-m transect is located along the elevation contour. Cover of each species is recorded to the nearest 10 cm, within 1-m intervals. Bare space is recorded separately. At 2-m intervals (n = 10) within the lower marsh, a circular quadrat ( m2) is used to select cordgrass stems for height measurements. At 10-m intervals (, 3 per transect), soil salinity is measured at 10 and 30 cm depth. Soils in the lower and middle transects are generally moist enough to express soil water onto the refractometer. Drier soil samples at the upper transects are collected, returned to the laboratory, and mixed with deionized water to form a uniform soil paste before expressing the filtrate onto the refractometer. The upper marsh data are thus representative of soil salinities that follow rainfall, while the lower and middle marsh data represent ambient conditions. The above sampling program began in 1989 and, as of this 1991 writing, has characterized the marsh soils and vegetation during a period of relatively similar environmental conditions. Sewage flows from Mexico, which averaged up to 13 MGD from 198
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