. The ecology of Tijuana Estuary, California : a national estuarine research reserve . Figure Black-crowned night herons. Juveniles (right) have streaked plumage. Mclntire collection, © 1986 by Zedler. Most of our understanding of how brackish marsh vegetation relates to saline conditions comes from studies at the San Diego River marsh (20 km north of Tijuana Estuary). There, 1980 floodflows were prolonged by reservoir discharge, and intertidal marsh soils were oligohaline (under 10 ppt) for 2- 3 months. Cattails and several other brackish marsh species invaded and dominated the intertid
. The ecology of Tijuana Estuary, California : a national estuarine research reserve . Figure Black-crowned night herons. Juveniles (right) have streaked plumage. Mclntire collection, © 1986 by Zedler. Most of our understanding of how brackish marsh vegetation relates to saline conditions comes from studies at the San Diego River marsh (20 km north of Tijuana Estuary). There, 1980 floodflows were prolonged by reservoir discharge, and intertidal marsh soils were oligohaline (under 10 ppt) for 2- 3 months. Cattails and several other brackish marsh species invaded and dominated the intertidal zone. As has been shown experimentally by Beare (1984, Beare and Zedler 1986), the adult cattails readily tolerate saline conditions. Some individuals in experimental treatments survived a year in 45 ppt water; aboveground parts died, but rhizomes were able to resprout when freshwater was resupplied. Thus, the limiting factors for invasion are seed germination, which declines to near-zero at 20 ppt, and the period of time required for the cattails to grow salt-tolerant rhizomes (estimated to be 2 to 3 months).
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