. Bulletin. Science; Natural history; Natural history. FLOOD EFFECTS ON INTERTIDAL BIOTAS 97. Fig. 2. (A) View of study site from Morning Canyon. (B) Beach above study site showing erosional path of the flash-flood. (C) Windrows of recently killed Strongylocentrotus purpuratus tests cast onto beach two days after the flood. (D) Population of healthy S. purpuratus in deep lower shore pool in the path of inundation. would kill the more stenohaline populations. Indeed, two days after the storm, windrows of recently killed sea urchins were cast up on the shore, but only above the study site near t
. Bulletin. Science; Natural history; Natural history. FLOOD EFFECTS ON INTERTIDAL BIOTAS 97. Fig. 2. (A) View of study site from Morning Canyon. (B) Beach above study site showing erosional path of the flash-flood. (C) Windrows of recently killed Strongylocentrotus purpuratus tests cast onto beach two days after the flood. (D) Population of healthy S. purpuratus in deep lower shore pool in the path of inundation. would kill the more stenohaline populations. Indeed, two days after the storm, windrows of recently killed sea urchins were cast up on the shore, but only above the study site near the eroded portion of the beach (Fig. 2C). Consequently, we documented the effects of this stochastic disturbance on a rocky-intertidal biota for which an extensive historical baseline of descriptive information was available. Study Area The site selected for study at Corona del Mar, California (Figs. 1 and 2A) lies near the mouth of Morning Canyon (approximately 33°35' 14"N and 117°51 '54"W), located km southeast of the entrance channel to Newport Bay. The intertidal zone extends over a horizontal distance of about m with a slope of degrees. Although spring tides at the site have an amplitude greater than m, the tidal range of our quadrats was MLLW to + m levels. A sandy beach covered the upper intertidal zone. The rocky portion studied consists of siltstone and conglomerate, covered almost entirely by granitic boulders ( to m in diameter). Environmental Data Long-term records of mean monthly air and seawater temperatures (12 to 21 °C and 15 to 19°C, respectively) reflect a reasonably constant system, with January to February being the coldest and August the warmest periods of the year (Kimura 1974; Department of Commerce 1970). Records of seawater salinity near the study site are available for 1961 (Scripps Institution of Oceanography 1962). Please note that these images are extracted from scanned page images that may have been dig
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