Stream Life 73 



Study 8 

 THE LIFE OF A RAPID STREAM 



Work Program: 



1. A trip to a swift flowing, preferably stony, brook for: 



A. Individual collecting by hand picking from stones, logs and leaf drifts, 



B. Hand screen, sieve net, and seine collecting. 



2. A laboratory examination of the materials collected. 



3. Reading in the Life of Island Wafers, pp. 258 to 261; 363 to 376. 



For Record include: 



1. A sketch map of the bit of stream examined showing the t\'pes of habitats from 



which collections were made: falls, rapids, runs, scour-basins, bars, mud beds, etc. 



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



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



A. Seed plants — in current and in edges. 



B. Algse — microscopic ones only when these appear in masses or color the 



bottom. 



Fringing (sessile) algae, 

 slime coat algse. 

 Encrusting 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, on the stones or on bottom. 



Burrowers that dig. 



Burrowers that squeeze through. 



Tube dwellers. 



