. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 138 CALIFORNIA FISH AND GAME Aquatic Plants Bulrushes (Scirpus) and cattails (Typha) form good stands in many places along the river as in the marshes at Topoek. Similarly, they may be common in sloughs or seepage areas at some distance from the stream. The cattail is an active competitor of the bulrush and is one of the first plants to establish itself on sandbars. It may be expected to dominate many of the silting basins, although i
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 138 CALIFORNIA FISH AND GAME Aquatic Plants Bulrushes (Scirpus) and cattails (Typha) form good stands in many places along the river as in the marshes at Topoek. Similarly, they may be common in sloughs or seepage areas at some distance from the stream. The cattail is an active competitor of the bulrush and is one of the first plants to establish itself on sandbars. It may be expected to dominate many of the silting basins, although it in turn may be replaced by willows. But few submergents were seen during the season when the river was visited. Ditch grass (Ruppia), the holly-leaved naiad {Najas marina), and Potamogeton were the commonest forms observed. Except in a few areas, submergents did not appear to be abundant enough to be of much importance to fish. Only a species of blue-green alga seemed to be common in the river. In quiet bays and sloughs this was often abundant and formed a coating on the bottom and along the shores. Green algae were also found, and on the aprons of dams it is a common sight to see carp grazing on the "; The clearing of the water has promoted the growth of aquatic plans and a continued stabilization of the river and its substratum will bring about an increase in both emergent and submergent vegetation. In the area around Blythe there is a striking correlation between the decrease in siltation and the increase in plant growth. Tliere, the irrigation district has made plans to add silt to the canal water to keep down the growth of weeds. On the other hand the shifting of channels and silt movement as in areas above Imperial Dam offers continued resistance to tlie estab- lishment of many plants. Work by the Fish and Wildlife Service on its two river refuges should hasten plant growth through seeding and the building of dikes or Pig. 65. Drowned trees
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