Title: Bulletin
Identifier: bulletin8602sout (find matches)
Year: 1971- (1970s)
Authors: Southern California Academy of Sciences
Subjects: Science; Natural history; Natural history
Publisher: Los Angeles, Calif. : The Academy
Contributing Library: New York Botanical Garden, LuEsther T. Mertz Library
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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96 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES y^ LONG BEACH POINT FERMIN :-.-newport::-:-:-:-::-.'-:-:-:-:- "N^:BAY/?.: x::::::: X;: ^-^^xoRONA del::;:- y^H-M.AR.-;-:-:-:':':' dan;v^ POINT
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Fig. 1. Location of the Corona del Mar study site and permanent transect lines. that considerable decreases had occurred, with Corona del Mar ranking third in greatest percentage of species lost relative to other regions of Southern California. In agreement, Thorn and Widdowson (1978) noted that massive and foliose in- tertidal algae in the area had been replaced by turf-like forms (along with artic- ulated corallines). Information exists concerning the effects of various physical/chemical distur- bances such as sewage pollution (e.g., Borowitzka 1972; Munda 1974; Littler and Murray 1975; Murray and Littler 1978, 1984), sand scouring and sediment burial (e.g., Daly and Mathieson 1977; Seapy and Littler 1982; Taylor and Littler 1982; Littler et al. 1983), substratum instability (e.g., Sousa 1979, 1980; Littler and Littler 1984), extreme aerial exposure (e.g., Seapy and Littler 1982), and sediment inundation (Seapy and Littler 1982; Stewart 1983; Littler et al. 1983) on the population dynamics and diversity of intertidal seaweeds. However, the impact of freshwater flooding in the intertidal has not been measured. On 9 May 1977, a localized rainstorm occurred in which deluge-level quantities of rain fell (2.56 cm â 3 h ~') causing Morning Canyon to flood and produce torrents, which eroded a large gully in the sandy beach (Figs. 2A and B) and flooded the study site. No accumulation of sediments occurred anywhere in the intertidal zone. We suspected that the stresses imposed by such a large freshwater inundation

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