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.

Estimation of Size-Specific Mortality Rates in Zooplankton Populations by Periodic Sampling

Michael Lynch
Limnology and Oceanography
Vol. 28, No. 3 (May, 1983), pp. 533-545
Stable URL: http://www.jstor.org/stable/2835833
Page Count: 13
  • More info
  • Cite this Item
Estimation of Size-Specific Mortality Rates in Zooplankton Populations by Periodic Sampling
Preview not available

Abstract

Many populations of small, mobile organisms cannot be analyzed with standard demographic techniques. A method is introduced for estimating patterns of size-specific mortality for such species from periodic samples. The technique does not require that individuals be marked or recaptured and may be extended to age and other quantitative characters so long as the class distribution of the population and the rate of flux of individuals between classes can be accurately determined. The most serious difficulty in applying the technique seems to be the ability to sample adequately populations that are patchy in space. However, even if the problem of patchiness cannot be eliminated, so long as the size-frequency distribution can be accurately described, the technique generates the correct pattern of size-specific mortality and will provide minimum estimates of mortality for the different classes. Preliminary results presented for four species of planktonic cladocerans suggest that more widespread application of the technique may allow an empirical test of the assumptions on which zooplankton community theory is based.

Page Thumbnails

  • Thumbnail: Page 
533
    533
  • Thumbnail: Page 
534
    534
  • Thumbnail: Page 
535
    535
  • Thumbnail: Page 
536
    536
  • Thumbnail: Page 
537
    537
  • Thumbnail: Page 
538
    538
  • Thumbnail: Page 
539
    539
  • Thumbnail: Page 
540
    540
  • Thumbnail: Page 
541
    541
  • Thumbnail: Page 
542
    542
  • Thumbnail: Page 
543
    543
  • Thumbnail: Page 
544
    544
  • Thumbnail: Page 
545
    545