دورية
ENCLOSURE EXPERIMENTS: THE EFFECTS OF PLANKTIVOROUS FISH
| العنوان: | ENCLOSURE EXPERIMENTS: THE EFFECTS OF PLANKTIVOROUS FISH |
|---|---|
| المؤلفون: | Queen, D. J. Mc, Post, J. R. |
| المصدر: | Lake and Reservoir Management; 1986, Vol. 2 Issue: 1 p313-318, 6p |
| مستخلص: | Limnologists manipulating segments of freshwater ecosystems with enclosures frequently exclude or ignore fish populations. Both courses of action can seriously bias results because a strong negative correlation (r = .77) exists between fish and zooplankton biomass, and failure to account for planktivore effects will jeopardize an accurate interpretation of zooplankton results. These effects are also transmitted to the phytoplankton community. In eutrophic lakes, enclosures containing planktivore bio-masses of less than 20 kg/ha often support populations of large Daphnia, which can have strong negative impacts (r = .81) on phytoplankton biomass. When planktivore biomass is more than 20 kg/ha, large Daphnia cannot survive and zooplanktonic regulation of phytoplankton biomass is not observed. We conclude that even though enclosure experiments may not include the effects of planktivores, the latter cannot be ignored. |
| قاعدة البيانات: | Supplemental Index |
| تدمد: | 10402381 21515530 |
|---|---|
| DOI: | 10.1080/07438148609354649 |