. Bulletin. Science; Natural history; Natural history. 96 48 OD 2D 4D 6D 8D 10D. 00 20 40 60 80 100 \/ I I I I I I I I I I 96 48 -96 48 OB 2B 4B 6B 8B 10B OB 2B 4B 6B 8B 10B 06 2B 4B 6B 8B 10B 1974 1992 Fig. 5. Palos Verdes surface sediment chromium concentrations, and benthic infaunal abundance and number of species, 1974 and 1992. Stations along 3 depth transects are shown: 30-m ("D" stations), 61-m ("C"), and 152-m ("B"). Many organisms previously absent from the mid-shelf progressively encroached upon the outfall area. Enhanced biomass declined. Benthic succes
. Bulletin. Science; Natural history; Natural history. 96 48 OD 2D 4D 6D 8D 10D. 00 20 40 60 80 100 \/ I I I I I I I I I I 96 48 -96 48 OB 2B 4B 6B 8B 10B OB 2B 4B 6B 8B 10B 06 2B 4B 6B 8B 10B 1974 1992 Fig. 5. Palos Verdes surface sediment chromium concentrations, and benthic infaunal abundance and number of species, 1974 and 1992. Stations along 3 depth transects are shown: 30-m ("D" stations), 61-m ("C"), and 152-m ("B"). Many organisms previously absent from the mid-shelf progressively encroached upon the outfall area. Enhanced biomass declined. Benthic succession, 1972 to 1992, is illustrated for Station 4C, located about km northwest of the outfalls (Fig. 7). Notable are the decreases in sediment organic enrichment (and contamination), the biological variability, the increases in numbers of species, and the pattern of species replacements. In 1972, there were many small, subsurface deposit feeding annelids (, Schistomeringos lon- gicornis). A very high biomass of the echiuran Listriolobus pelodes occupied the mid-shelf from 1973 to 1977; they significantly modified the benthic habitat. Listriolobus and its associates, including the clam Mysella tumida and the poly- chaetes Mediomastus, Prionospio and Tharyx, thrived. When the echiuran pop- ulations declined, conditions were unstable, and Capitella and Nereis procera (polychaetes) recruited into the area. The clams Parvilucina tenuisculpta and Tel- lina carpenteri became more common. The small brown ostracod Euphilomedes carcharodonta thrived in the early 1980s and 1990s. The burst of Spiophanes missionensis in the early 1980s was associated with strong El Nino conditions. 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, Calif. : The Academy
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