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Effects of nitrogen and phosphorus on the abundance and cell size of planktonic nanoflagellate communities
| Content Provider | Scilit |
|---|---|
| Author | Pereira, Danielle Goeldner Lansac-Tôha, Fábio Amodêo Pauleto, Gustavo Mayer Bini, Luis Mauricio Velho, Luiz Felipe Machado |
| Copyright Year | 2012 |
| Description | AIM: We experimentally investigated the effects of nutrients (Nitrogen and Phosphorus) enrichment on the density, biomass, and cell size of pigmented and heterotrophic plankton nanoflagellates communities. METHODS: The experiment was done in mesocosms in a tropical reservoir during a 19-day period. Four different treatments were carried out: Control (non-nutrient addition - C), phosphorus additions (P), nitrogen addition (N) and phosphorus + nitrogen addition (N + P). Each treatment was performed in triplicate, sorted randomly, thus giving a total of 12 experimental carboys, which were placed transversely in the middle of the reservoir. RESULTS: In general, pigmented and heterotrophic nanoflagellates fractions responded to nutrient addition, increasing densities and biomass values at the fertilized treatments. Opposed to expected, enriched treatments resulted in a slight decrease in mean cell size of the pigmented fraction. Moreover, in nutrient-rich treatments, pigmented nanoflagellates had higher relative abundance than in the control. CONCLUSIONS: Our results indicate that: i) the density and biomass of nanoflagellates responded to the nutrient enrichment, mainly when N and P were added together; ii) the pigmented and heterotrophic fractions showed distinct time responses to fertilization; iii) the growth of nanoflagellate community seems to be co-limited by N and P; iv) the nutrient enrichment led to a greater pigmented than heterotrophic fraction contribution; and v) among the analyzed variables, nanoflagellate densities seem to be more sensitive to changes in nutrient availability than biomass or mean cell size. |
| Related Links | http://www.scielo.br/scielo.php?script=sci_pdf&pid=S2179-975X2012000400010&lng=en&nrm=iso&tlng=en |
| Ending Page | 437 |
| Page Count | 11 |
| Starting Page | 427 |
| e-ISSN | 2179975X |
| DOI | 10.1590/s2179-975x2013005000009 |
| Journal | Acta Limnologica Brasiliensia |
| Issue Number | 4 |
| Volume Number | 24 |
| Language | English |
| Publisher | FapUNIFESP (SciELO) |
| Publisher Date | 2012-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acta Limnologica Brasiliensia Marine and Freshwater Biology Effects of Nitrogen Planktonic Nanoflagellate Nanoflagellate Communities |
| Content Type | Text |
| Resource Type | Article |
