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Fresh-water Biology 



Study 9 

 THE LIFE OF A SLOW STREAM 



Work Program: 



1. A trip to a meandering bottom-land stream for: 



A. Individual hand picking and dip net collecting from leaf drifts, brush and 



trash trailing in the edges. 



B. Seine, sieve net and weed-hook collecting. 



2. A laboratory examination of the catch. 



3. Reading in the Life of Inland Waters, pp. 363 to 376. 



For Record include: 



1. A sketch map of the bit of stream examined, showing types of habitats from which 



collections were made; open channel, obstructions, settling basins, bars, etc. 



2. An annotated list of the organisms collected arranged under the following headings. 



I. Plants — with notes on size, color, relative abundance, habitat, growth habits, 



etc. 



A. Seed plants — in the edges and in the settling basins. 



B. Algae — microscopic ones only when these appear in masses. 



Fringing (sessile) algae. 

 Slime-coat algae. 



II. Animals — with notes on size, color, relative abundance, feeding habits 



stages or ages found, habitat and special adaptations or activities. 



A. Vertebrates fishes and others. 



B. Invertebrates: 



Free ranging. 



Sessile. 



Burrowers that dig. 



Burrowers that squeeze through. 



Tube dwellers. 



