FOOD HABITS OF SHOAL-WATER DUCKS. 



49 



Table I. — Items of vegetable food identified in the stomachs of the ducks treated in this 

 bulletin end the number of stomachs in which found. 



Kind of food. 



Gad- 

 wall. 



Bald- 

 pate. 



Green- 

 winged 

 teal. 



Blue- 

 winged 

 teal. 



Cinna- 

 mon 

 teal. 



Pin- 

 tail. 



Wood 

 duck. 





417 

 29 



255 



8 

 1 

 2 

 13 

 1 



653 



7 



319 



4 



41 



790 



8 



413 



Subkingdom ETJTHALLOPHYTA. 



4 



Oedogonium sp 







3 

 22 













Chara sp. (musk grass) 



89 



31 



1 



49 



1 



















1 



Subkingdom PTERIDOPHYTA. 



Marsileaceae. 













2 





Equisetaceae. 





1 



1 









Subkingdom SPER.MATOPHYTA. 



Pinaceae. 









21 





Taxodium distichum (bald cypress), cone scales. 



6 



1 



5 







181 



Taxodium distichum (bald cypress), galls 









35 

















2 



Sparganiaceae. 















17 



Sparganium androcladum (bur reed) 









2 

 39 







1 





2 



8 



10 



42 



1 



32 



35 



Naiadaceae. 





Potamogeton natans (floating pondweed) 







1 







1 



Potamogeton americanus (long-leaved pond- 













1 



Potamogeton heterophyllus (variable pondweed). 















1 









1 











Potamogeton zosterifolius (eelgrass pondweed). . 













3 



Potamogeton fresii (Fries pondweed) 



1 



3 















Potamogeton pusillus (small pondweed) 



3 



4 







3 

 1 



1 



10 



271 



254 



18 



93 





Potamogeton diversifolius (curly pondweed) .... 









Potamogeton foliosus (leafy pondweed) 















Potamogeton pectinatus (Sago pondweed) 



Potamogeton sp. (unidentified pondweeds) 



9 

 142 

 112 

 20 



3 



5 

 94 

 92 



8 

 10 



7 



248 



111 



10 



3 



150 



87 

 2 

 3 

 1 



17 



1 

 32 

 16 

 10 



2 

 44 



Zannichellia palustris (homed pondweed) 





Najas marina (large bushy pondweed) 





Najas flexilis (bushy pondweed) 



17 



' 9 

 2 



27 

 19 





23 



88 

 2 



1 



Juncaginaceae. 



Triglochin maritima (arrow-grass) 



1 



Alismaceae. 



















1 





2 



Sagittaria teres (slender arrowhead) 











2 

 76 



4 





Sagittaria platyphylla (delta potato) 



45 













Sagittaria sp. (unidentified arrowheads) ... 



2 



2 



4 





5 



