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Bulletin of the Illinois State Laboratory of Natural History Volume 8

Bulletin of the Illinois State Laboratory of Natural History Volume 8


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...hydrographie disturbances during the summer. The adult population was reduced during this year, and especially during the summer floods, but the nauplii do not fall conspicuously below those of other years. It would therefore seem that the deleterious action of flood conditions operates more effectively upon the adult and young than upon the nauplii. This fact may be due to the relative absence of spines and hairs on the nauplii, structures which gather silt and load down the larger forms in the flood waters. The greater number of young and adults in 1896 as compared with 1898 may be due to the more gradual rise of the floods of the former year (see Pl. X. and XII., Pt. I.) and the proportionally greater amount of silt in the more sudden floods of the latter. The ratios given in the table are of course subject to the error arising from the uneven seasonal distribution of the collections in some years, and to that arising from varying location of the collections on the pulses, especially on those of greatest amplitude. An additional error arises from the leakage of the smaller nauplii through the meshes of the silk net. I have found on experiment that they will thus escape under pressure of a column of water only 3-4 cm. in height. Their dimensions are such that the smaller individuals can pass through the meshes of even the No. 20 silk. It seems probable that ratios of nauplii to adults are actually greater than our records indicate. The relationship which the pulses of nauplii bear to those of the adult Cyclopid may be inferred from an examination of the data of Table I. An analysis of the seasonal distribution of the total young and adult Cyclopid and of the nauplii reveals the fact that in all seasons in which collections at approximate...


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Product Details
  • ISBN-13: 9781130609158
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 214
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1130609154
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 390 gr


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