FINGER I^AKES OF NEW YORK 



251 



The largest amount was obtained at 32 m. in Seneca Lake, where it reached 1,693 kg. 

 of dry material per square kilometer, or a little more than 15 pounds per acre. 



The deepest haul in Cayuga Lake yielded a larger amount of organic matter than 

 the deepest haul in any of the other lakes, while the one at 34 m. was the poorest of all, 

 due most probably to the fact that it was made on a very steep slope. Green Lake 

 showed the second largest amoimt of material in its deepest water and Canandaigua 

 Lake was third. In Seneca Lake the amount at 1 10 m. was only about three-quarters 

 as great as at 172 m. In general, it appears that the bottom fauna in the deeper water 

 of Green Lake pelds a larger amount of dry organic matter per unit area than these 

 three Finger Lakes. 



Table 23. — Number op Individuals and Weight op Bottom Fauna Obtained at Difperent 

 Depths in Three Finger Lakes, N. Y., and in Green Lake, Wis., in 1918. 



canandaigua lake. JULY 28, 1918. iftif 



Depth in 

 meters 



Oreanism. 



Number 



per 



square 



meter of 



bottom. 



Dry weight. 



Kilograms 

 per square 

 kilometer. 



Founds 

 per 



Organic matter. 



Kilograms 

 per square 

 kilometer. 



Pounds 

 per 

 acre. 



Cbironomas, 

 Pontoporeia. 

 OUgochaeta, 

 Chironomus. 

 Pontoporeia 

 .Oligodiaeta. 



800 

 977 



X,430 



45 

 844 

 890 



3x9.3 

 469.0 

 533.9 



13. Q 

 405.1 

 326.8 



1.95 



4.X7 



4- 6s 



.XI 



3.60 



3.9X 



ISS-O 

 353.0 

 459. X 

 8-5 

 303.8 

 386.9 



X.38 

 3-13 

 4.0S 

 •07 

 3.70 

 «.5S 



CAYUGA LAKE, JULY 30, X918. 



34- • 

 113. 



(Chironomus. . 

 IPontoporeiia, 



(Chironomus. . 

 Pontoporeia . 

 Oligochaeta. . 



133 

 17S 



36.4 



8s- 4 



1,058.5 



340.8 



474- o 



-33 



-76 



9.43 



3- 03 



4.33 



35-7 

 64.0 

 784-4 

 255-6 

 4x6.2 



•23 

 -57 

 6-66 



2.3) 

 3-70 



SENECA LAKE. AUG. i, 1918. 



chironomus.. 

 Protenthes. . . 

 Pontoporeia. , 

 Oligodiaeta.. 

 Chironomus. . 

 Pontoporeia. . 

 Oligodiaeta.. 



GREEN LAKE, AUG. 20, xgxS. 



•3< 

 .Ot 



74-93 

 4-13 



x-s: 



5-01 

 4-S! 



