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Bulletin of the U.S. Department of Agriculture Volume 712-725

Bulletin of the U.S. Department of Agriculture Volume 712-725


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ... with nutritious material, it is no wonder they are a favorite with wild ducks. The seeds of 13 species of smartweeds have been identified from stomachs of the mallard, besides buckwheat, Brunnichia, and dock, which belong to the same family. A mallard collected at a locality where buckwheat was used for bait had about 750 of the large akenes in its crop and gizzard. A smartweed with a prickly four-angled stem and arrow-shaped leaves (Polygonum sayittatum) is a favorite with mallards. Its seeds were identified in 107 stomachs, as many as 2,000 being found in one. No fewer than 4,500 seeds of the water pepper Polygonum hydropiper) were taken from the crop and gizzard of another mallard. PONDWEEDS (8.23 PER CENT). The pondweed family is important to almost all ducks. These submerged plants are abundant and widespread, usually produce a good crop of seeds, and often have fleshy rootstocks and foliage which are wholly edible. Seeds of pondweeds, not further identified, were found in 431 mallard stomachs, up to 560 in number in a single instance. Remains of six species of the genus Potamogeton were found during the analyses. The most important species for the mallard as well as for other ducks is the sago pondweed (Potamogeton pectinatus), of which stems, foliage, seeds, rootstocks, and tubers all were eaten. Among other plants of this family, widgeongrass (Ruppia maritima) was found in 72 gizzards and bushy pondweed (Naias flexilis) in 67. No fewer than 5,500 seeds of eelgrass (Zostera marina), a salt-water representative of the family, were found in a single mallard's stomach. DUCKWEEDS (0.01 PER CENT) AND COONTAIL (5.97 PER CENT). Duckweeds (Lemnacese) thickly cover the surface of the water in southern swamps, and coontad (CeratopJiyUum...


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Product Details
  • ISBN-13: 9781236791818
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 198
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1236791819
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 363 gr


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