File:Bulletin (1941) (20241977249).jpg

Title: Bulletin
Identifier: bulletin2219411943illi (find matches)
Year: 1918 (1910s)
Authors: Illinois. Natural History Survey Division
Subjects: Natural history; Natural history
Publisher: Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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426 Illinois Natural History Survey Bulletin I'ol. 22, Art. 5 food for baldpates and gad walls. It furnishes little seed, but ducks make ex- tensive use of the leaves and stems. Teal grass, Eragrostis hypnoidcs, has a status that cannot be judged by any index figures derived from use and abundance data recorded for this spe- cies, tables 3,4, 5 and 6. This is evident from the fact that in 1938 and 1939 it formed respectively 3.16 and 1.54 per cent of the food taken, while only a few small patches of plants were seen on ex- tensive mud flats around several lakes. In all probability, ducks in those years obtained seeds deposited by growths of previous seasons. This small, procum- bent plant in 1940 was overgrown by pigweeds, millets and smartweeds to such an extent that accurate mapping of the areas covered by the numerous scattered patches was impossible. From its relatively high use and ap- parently low occurrence, we believe that teal grass ranks above duck potato in
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Fig. 10. — Marsh smartweed (Polygonum Muhlenbergii), one of the few smartweeds that grows in water, can readily be identified by its bright pink blossoms. It is not so valuable a duck. food plant as largeseed or nodding smartweeds because it does not produce so much seed.

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