ISSN:
1573-5117
Keywords:
Benthic
;
removal
;
catchability
;
Surber
;
kick-net
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A Circular Depletion Sampler (CDS) was designed to allow the removal of consecutive subsamples from a sample area, while minimizing immigration and emigration. Equal sampling effort was expended during each removal period to permit estimation of both the probability of capture, and the number of individuals not captured from a sample area. Average probabilities of capture from 270 CDS samples ranged from 0.19 per minute for Antocha (Tipulidae) to 0.96 for Paratendipes (Chiroal (3 removal periods), Surber, and kick-net methods. Removal population estimates were consistently higher and less variable than those of the other methods. Estimates of diversity from samples taken with conventional methods were biased by differences in catchability, and by emigration. Separation of benthos from detritus took about twice as long per unit sample area for Surber and kick-net methods, although sampling time per unit area was nearly equal for all three methods. Removal estimates using only the first two catches were comparable to estimates based on three catches, indicating a further possible increase in efficiency.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00005843
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