Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Seasonal Activity of Lumbricids in Southern Sweden

S. Nordström
Oikos
Vol. 26, No. 3 (1975), pp. 307-315
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3543501
Stable URL: http://www.jstor.org/stable/3543501
Page Count: 9
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Seasonal Activity of Lumbricids in Southern Sweden
Preview not available

Abstract

Population densities and development throughout the year of different lumbricid species were estimated by handsorting, and compared with formaldehyde catches in order to estimate percentage of active individuals. Activity (= excitability, trappability) was defined as the number of individuals obtained by formaldehyde as a percentage of the actual population. The study showed that lumbricid activity was seasonal. All species were more or less inactive during winter, while reduced activity or inactivity during summer was exclusively found in Allolobophora. Dendrobaena and Lumbricus were active at 0-20°C when soil moisture was below pF 4.2. Allolobophora showed low activity below 2-4°C, and above 14-16°C when pF > 3.2-3.5. Differences in activity were seen between juvenile and adult Allolobophora and Lumbricus. Factors other than soil microclimate, e.g. food, are suggested to be important in the regulation of lumbricid activity. /// Плотность попсляции и развитие в течение года различных видов дождевых червей исследовлось методом ручной разборки и сравнивались с фовмалиновыми сбонами дия определения доли активных особей. Активность (= возбудимость, улавливаемость) была определена как число особей, обнаруженных с помощью составляющих долю активной части популяюии. Исслдование показало, что активность доыдевых червей колеблется в разные сезоны. Все вибы более или менее неактивны зимой; сниженная активность или неактивное состояние в течение лета была характерна лишь для Allolobophora. Dendrobaena и Lumbricus активны при 0-20°C и виажности ночвы pF 4,2. У Allolobophore низкая активность наблюдается ниже 2-4°C и выше 14-16° при pF -3,2-3,5. Различия активности установлены у ювенильных и половозрелых особей Allolobophore и Lumbricus. Установлено, что другие фомимо микроклимата, например, пища, имеют значение в регуляции активности червей.

Page Thumbnails

  • Thumbnail: Page 
307
    307
  • Thumbnail: Page 
308
    308
  • Thumbnail: Page 
309
    309
  • Thumbnail: Page 
310
    310
  • Thumbnail: Page 
311
    311
  • Thumbnail: Page 
312
    312
  • Thumbnail: Page 
313
    313
  • Thumbnail: Page 
314
    314
  • Thumbnail: Page 
315
    315