Biological Survey — Oswego Watershed 245 



P. pectinatus, P. Bobbinsonii, P. compressus and P. amplifolius, 

 eel-grass, Vallisneria americana, hornwort, Ceratophyllum demer- 

 sum, Najas flexilis, Elodea canadensis, mud plantain, Heteran- 

 thera dubia, water marigold, Bidens Beckii, and a number of less 

 common species. Buppia maritima and Najas marina, two brackish 

 water plants, were found only at the north end of Cayuga lake. 

 Both were rather common at Cayuga Park and the latter was also 

 found at Canoga marshes. From Canoga northward, weed beds 

 were observed almost to the middle of the lake in several places. 

 The vegetation in the deeper water sometimes consisted entirely 

 of Chara or Nitella or both growing together. Potamogeton 

 gramineus var. graminif alius was frequently found associated with 

 Chara. 



The bottom at the south end of the lake is rather shallow and 

 sandy near the shore, but somewhat muddy near the 15-25 foot 

 depth which marks the limits of rooted aquatics. Except for 

 some barren sandy places near the southeast corner and the deeper 

 bottom near the middle of the lake, most of the bottom of the area 

 between the south end of the lake and a point one-half mile to the 

 north is covered by rather dense weed beds. The total area 

 occupied by these weed beds is probably less than one square mile. 

 The densest of these beds are located between the lighthouse and the 

 west shore and off the east shore, extending for some distance in 

 each direction from the Kemington Salt Works. The predominat- 

 ing species in the southwest corner were Potamogeton pectinatus, 

 P. Bichardsonii, P. crispus, Elodea canadensis, Najas flexilis, and 

 in deeper water, Zannichellia palustris and Nitella were abundant. 

 Along the east shore Potamogeton Bichardsonii and P. Friesii 

 were the predominating species. 



Along the east shore small areas of weed beds occur in the little 

 bays to the north and south of Myers point, in Aurora bay and 

 to the north and south of Farley's point. At the first two places 

 the predominating species were Potamogeton Bichardsonii and 

 P. pectinatus and in deeper water also P. gramineus var. gramini- 

 folius. At Farley's point the vegetation was very dense and con- 

 sisted of representatives of most of the species found in Cayuga 

 lake. Along the rest of the shore only scattered and very narrow 

 weed beds occur. These beds are usually less than 100 feet in width 

 and seldom extend for more than 100 yards from shore except on 

 each side of the larger points. 



Weed beds in Seneca lake. — There are but two localities in 

 Seneca lake where extensive weed beds occur. The largest and 

 most productive weed beds are at the north end, especially in the 

 northwest corner, covering a total area of probably less than one 

 square mile. In the shallow water near the shore the vegetation 

 was very dense and consisted of numerous species among which 

 Potamogetons predominated. In deeper water Chara and Nitella 

 were the predominating plants, usually alone or sometimes asso- 

 ciated with Potamogeton gramineus var. graminif 'alius. The only 



