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EFFECTS OF ADDED NUTRIENTS ON DRY MASS, AFDM, CHLOROPHYLL a AND BIOVOLUME OF PERIPHYTON ALGAE IN ARTIFICIAL STREAMS | ||
| Iranian Journal of Science | ||
| مقاله 4، دوره 29، شماره 1، اردیبهشت 2005، صفحه 29-38 اصل مقاله (149.75 K) | ||
| نوع مقاله: Regular Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijsts.2005.2781 | ||
| نویسندگان | ||
| M. SHARIFI* 1؛ M. GHAFORI2 | ||
| 1Department of Biology, Faculty of Science, Razi University, Baghabrisham, Kermanshah, 67149, I. R. of Iran, | ||
| 2Department of Biology, Faculty of Science, Razi University, Baghabrisham, Kermanshah, 67149, I. R. of Iran | ||
| چکیده | ||
| We studied the role of nutrients on various aspects of the periphyton community in artificial streams. Dry mass, ash-free dry mass, chlorophyll a and biovolume of the periphyton community were measured under 3 different nutrient regimes, including one from natural streams as a control and two which were enriched with N and N+P. Results of this experiment indicate that the standing crop of the periphyton community in the artificial streams increased with increasing the amount of the nutrient. Also, we showed that diatom diversity was affected by increasing the nutrients concentrations. The periphyton dry mass following 23 days of experiment was 0.96, 1.4 and 3.52 mg/cm2 for control, N and N+P artificial streams, respectively. Ash-free dry mass (AFDM) of the periphyton community for control, N and N+P treatment were 0.2, 0.98 and 1.04 mg/cm2, respectively. The experiment also depicted that the periphyton chlorophyll a increased with increasing the nutrient content in the artificial streams (for control, N and N+P enriched artificial streams, the chlorophyll a content was 2.11, 2.20 and 6.36 mg/m2respectively). The total diatom biovolume as a measure of standing crop in the periphyton community was 6x106, 8x106 and 48x106 μm3/cm2 for control, N and N+P enriched artificial streams, respectively. Results of this experiment demonstrated that adding nutrient increases the relative abundance of Navicula, Achnanthes, Nitzschia and Cocconies in artificial streams. | ||
| کلیدواژهها | ||
| Nutrients؛ periphyton؛ dry mass؛ AFDM؛ chlorophyll a؛ biovolume؛ diversity؛ Gamasiyab River | ||
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