The Effects of Sampling Intervals on Phytoplankton Growth and Loss Values Derived from Seasonal Phytoplankton Biomass Variations in an Artificial Lake
✍ Scribed by Dipl.-Biol. Heidemarie Horn
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 480 KB
- Volume
- 69
- Category
- Article
- ISSN
- 1434-2944
No coin nor oath required. For personal study only.
✦ Synopsis
Detailed vertical phytoplankton sample series with a good resolution were taken every 3-4 days for almost two years from the artificial Lake Saidenbach. The intervals between samplings were systematically increased by regularly "ignoring" certain samples so t.hat six different annual curves based on different sampling frequencies were obtained to describe phytoplankton variations in the course of the year from a single time series. I n this way i t was possible to study the effect of the interval between samplings on the results of phytoplankton studies and on the rates of change and turnover calculat.ed from the biomass. The results show that the maximum rates of change and turnover values yielded by half-weekly samplings are some 20-30 a,(, higher than those yielded by weekly samplings. Sampling intervals smaller than 3-4 days yield not. much increased rates of change and turnovers. This implies that short term changes in the phytoplankton are more accurately detected by half-weekly samplings. It is therefore suggested that, depending on the nature and objectives of the investigations, sampling intervals of 3-4 weeks are sufficient for the winter, but during the growth period (spring t.o aut,umn) samples should be takrn :I & least once a week or fortnightly.