. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. ECOLOGICAL STUDY OF SAN GABRIEL RIVER 59 al these same stations between the rocks. The tube-dwelling polychaete Boccardia proboscidea Hartman formed beds a1 Stations 3 and 4. insect Larvae were observed in the mud at stations 5 to 9 and 11. Oligochaetes were associated with the insect larvae al Stations I and 8.) Whereas no living animals had been found in the bottom on May 2, 1952, a total of 578 animals representing 12 species were
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. ECOLOGICAL STUDY OF SAN GABRIEL RIVER 59 al these same stations between the rocks. The tube-dwelling polychaete Boccardia proboscidea Hartman formed beds a1 Stations 3 and 4. insect Larvae were observed in the mud at stations 5 to 9 and 11. Oligochaetes were associated with the insect larvae al Stations I and 8.) Whereas no living animals had been found in the bottom on May 2, 1952, a total of 578 animals representing 12 species were taken during the survey on July 15, 1954 (Table 4). These included: a sea anemone, a turbellarian, a nemertean, five polychaetes, two crustaceans, and two peleevpods. Four hundred and seventy-four of the 578 specimens were taken at Station 8. The crustacean Epinebalia sp. was the only species of the 12 not found at Station 8, just upstream from the Pacific Coast Highway and within the area excavated by the Los Angeles Flood Con- trol District in 1952. All except Prionospio cirrifera Wiren, Epim balia sp., and the sea anemone have been reported from nearby Alamitos Bay I Heish and Winter, 1954). The polychaete Capitella capitata was found at four stations (5, 6, 8, and 9) and was the most abundant animal taken (269 specimens). Several individuals of this species were incu- bating eggs at the time of collection. Capitella capitata and S'omlhis suecinea were two of the forms used by Filice (1954) as indicators of marginal zones of â & FIGURE 5. Lower San Gabriel River, looking southwest towards the Pacific Coast Highway (Alt. 101) bridge, the site of the dike during the dredging operations in the fall of 1952. Sta- tion 8 is located in the center foreground. Conduit in the left foreground connects with the tributary of the river (Figure 1, right branch). Photograph by the author, July 7, Please note that these images are extracted from scanned page image
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