. Bulletin. Histoire naturelle ; l'histoire naturelle. Août, 1959 Anderson : habitudes alimentaires de 335 canards migrateurs. Fig. 14. {Cyperns-Chufa esculentus), l'un des nombreux nut-herbes qui poussent sur le sol humide dans l'Illinois. Les canards se nourrissent de l'seeils et tubercules. utilisation de cette plante est produite durinj^ novembre, lorsque ses principaux consommateurs sont les plus abondants. Comme pour la plupart des plantes, des sols humides-dans 'les oreilles et dans les endroits où les semences ont été pres- ent et accessible, cet écrou-herbe a été une bonne source de nourriture waterfrwl:eum n;j : les mois d'automne. Il s'est classé douzième dans l'oc- currence index de pourcentage, tableau 37. Chufa Cy pen

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. Bulletin. Natural history; Natural history. August, 1959 Anderson: Food Habits of Migratory Ducks 335. Fig. 14.—Chufa {Cyperns esculentus), one of several nut-grasses that grow on moist soil in Illinois. Ducks feed upon the seeils and tubers. use of this plant occurred durinj^ Novem- ber, when its principal consumers were most abundant. As with most moist-soil plants, in 'ears and in places in which the seed was pres- ent and accessible, this nut-grass was a good source of waterfrwl food dur:n;j: the fall months. It ranked twelfth in the oc- currence-percentage index, table 37. Chufa Cy penis esculentus Chufa, fig. 14, occurred rather sporad- ically on mud flats, ditchbanks, and other moist ground in the areas from which giz- zards were collected. It was a preferred food of the blue-winged teal, green-winged teal, and pintail, which consumed seeds, seed heads, and tubers. Several hundred seeds were taken from a few of the teal gizzards. Structures of this plant were found in 385 gizzards and constituted 1.36 per cent of the total organic contents of the giz- zards examined, table' 38. As with the other moist-soil plants, chufa received the heaviest use during November. This nut- grass furnished good waterfowl food dur- ing the fall months when water conditions made the plants accessible. It ranked third among nut-grasses in the occurrence-per- centage index, table Zl. Walter's Millet Echinochloa walteri Although the seeds of Walter's millet, fig. 15, are much smaller than those of the wild millet, they were eagerly consumed by the ducks represented in this study. Walter's millet often volunteers in muck areas generally wetter than those contain- ing wild millet. Seeds of Walter's millet were found in the gizzards of most puddle ducks—in relatively largest am.ounts in gizzards of the pintail, green-winged teal, and blue-winged teal. The fruit is more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for

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