. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. SAN JOAQUIN VALLEY BLUECILLS 227 Benthic macroinvertebrate communities were dominated by the Asiatic clam, Corbicula fluminea; chironomid larvae, and oligochaetes (Sorenson and Hoff- man 1981; M. K. Saiki, unpub. data). During our study, benthic standing crops v^ere usually higher and communities more diverse in the upstream than in the downstream reaches of both the San Joaquin and Merced rivers (Table 2). CALIFORNIA Enlorgeij Area.
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. SAN JOAQUIN VALLEY BLUECILLS 227 Benthic macroinvertebrate communities were dominated by the Asiatic clam, Corbicula fluminea; chironomid larvae, and oligochaetes (Sorenson and Hoff- man 1981; M. K. Saiki, unpub. data). During our study, benthic standing crops v^ere usually higher and communities more diverse in the upstream than in the downstream reaches of both the San Joaquin and Merced rivers (Table 2). CALIFORNIA Enlorgeij Area. Somplinq Sites ® SJR ® SJR-2 (D SJR-3 @ SJR-4 © SJR-5 ® SJR-6 ® MR ® MR-2 ® SS I I Nonirrigoted londs [ I Irrigated londs ^B Reservoirs FIGURE 1. Locations of sampling reaches and irrigated croplands in the study area. Names of reaches are as follows: SJR-1, San Joaquin River near Fort Washington; SJR-2, San Joaquin River at Firebaugh; SJR-3, San Joaquin River at Lander Avenue; SJR-4, San Joaquin River at Fremont Ford State Recreational Area; SJR-5, San Joaquin River near Crows Landing; SJR-6, San Joaquin River at South County Park; Salt Slough, Salt Slough below Lander Avenue; MR-1, Merced River below Highway 59; and MR-2, Merced River at George J. Hatfield State Recreational Area. The composition of fish communities and relative abundance of individual species in the study reaches differed upstream to downstream (Saiki 1984). Species that occurred primarily at upstream reaches included sculpins, Cottus spp.; green sunfish, Lepomis cyanellus; redear sunfish, L microlophus; Sacra- mento squawfish, Ptychocheilus grandis; hardhead, Mylopharodon conoceph- alus; and threespine stickleback, Gasterosteus aculeatus. Downstream reaches were dominated by inland silverside, Menidia beryllina; white crappie, Pomoxis annularis; threadfin shad, Dorosoma petenense; fathead minnow, Pimephales promelas; splittail, Pogonichthys macrolepidotus; Sacramento blackfish. Ortho- don microlepid
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