the algae 



Table ii 



Development of littoral algal flora 



A. Occurrence of species 



(i) Species present throughout the year with no dis- 

 tinguishable maximum 



(2) Species present all the year with a maximum at 



one period 



(3) Species abundant at certain times of year only 



(4) Species present at certain times of year only 



B. Occurrence of tnaximum 



(1) Species with spring maximum and smaller 



autumn maximum : diatoms predominate 



(2) Species with spring maximum only 



(3) Species with summer maximum only : Chloro- 



phyceae predominate 



(4) Species with autumn maximum only: Myxo- 



phyceae predominate 



(5) Species with winter maximum only: Chloro- 



phyceae predominate 



C. Time of year when species occur in abundance at their 



greatest depth 

 (i) Species attaining greatest depth in spring: 

 diatoms only 



(2) Species attaining greatest depth in spring and 



autumn 



(3) Species attaining greatest depth in summer: 



Chlorophyceae predominate 



(4) Species attaining greatest depth in autumn 



369 



No. of species 



4 



7 

 numerous 



9 

 3 



II 

 II 



3 



3 



10 

 I 



Table iia 



Variations in Epipelic {bottom living) communities of Lake Winder- 

 mere with depth and season (After Round, 1956) 



Diatoms and season 



