. Bulletin - Southern California Academy of Sciences. Science. 146 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Oceanside Carlsbad Carlsbad/Leucadia Solaoa Beach Tbrrey Pines Scripps Coastal Reser¥e. Mission Beach North Silver S Tijuana River Estyary Fig. 1. Map of approximately 32° north, 117° west, showing the locations of the nine collection sites. Listed north to south, the locations are Oceanside (OS), Carlsbad (CB), Carlsbad/ Leucadia (C/L), Solana Beach (SB), Torrey Pines (TP), Scripps Coastal Reserve (SCR), Mission Beach (MB), North Silver Strand (NSS), and Tijuana River Estuary (TRE). Popu
. Bulletin - Southern California Academy of Sciences. Science. 146 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Oceanside Carlsbad Carlsbad/Leucadia Solaoa Beach Tbrrey Pines Scripps Coastal Reser¥e. Mission Beach North Silver S Tijuana River Estyary Fig. 1. Map of approximately 32° north, 117° west, showing the locations of the nine collection sites. Listed north to south, the locations are Oceanside (OS), Carlsbad (CB), Carlsbad/ Leucadia (C/L), Solana Beach (SB), Torrey Pines (TP), Scripps Coastal Reserve (SCR), Mission Beach (MB), North Silver Strand (NSS), and Tijuana River Estuary (TRE). Population density measurements for D. gouldii were taken at all locations during the lower low tides of a spring tidal cycle: OS, CB, and C/L on May 26; MB, NSS, and TRE on May 27, 2009; and SB, TP, and SCR on June 4, 2009. At each location, density was measured in at least four quadrats (50cm by 50cm), with two quadrats haphazardly placed at two or three tidal heights; densities were measured at or near the —, , and + mean low low water (MLLW) tide lines, which were determined by level scope and stadia rod. Sand was removed from each quadrat to an approximate depth of 15cm and sieved using a 2mm mesh; all D. gouldii recovered were collected for later analysis. Average population densities at low, mid, and high tidal heights were calculated by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles : Southern California Academy of Sciences
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