Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | The contribution of picophytoplankton to community structure in a Mediterranean brackish environment. |
| Abstract | The seasonal composition of phytoplankton communities was investigated in a Mediterranean brackish area (Varano lagoon). Twelve stations were sampled monthly from March 1997 to February 1998. Numbers of prokaryotic and eukaryotic picophytoplankton cells were estimated by epifluorescence microscopy, while larger phytoplankton (nano and micro fractions) were enumerated by the Utermöhl settling technique. Picophytoplankton densities ranged from 0.7 to 448.6 cells 106 l-1. Nano- and microphytoplankton abundances varied between 0.2 and 7.9 cells 106 l-1. The picoplankton fraction was represented mainly by cyanobacteria and the Utermöhl fraction by nano-sized phytoflagellates (56.2%) and diatoms (20.1%). The phytoflagellates had a greater abundance over time while diatoms reached the highest densities in summer and fall. In Varano lagoon phytoplankton development is related to nitrogen-poor waters and to phosphorus availability. Suspension-feeding bivalves (Mytilus galloprovincialis) are sufficiently abundant to filter a volume equivalent to the volume of Varano lagoon at least once daily. These observation suggest that grazing exert an important influence on phytoplankton dynamics, mainly on the micro fraction, and the diatoms seem to play an important role in the food web dynamics of this coastal fishery. |
| Source | Journal of plankton research 22, pp. 381–397 |
| Keywords | PhytoplanktonPicophytoplanktonNutrientsDiversityCoastal Ecosystem |
| Journal | Journal of plankton research |
| Editor | Information Retrieval Inc.],, [New York,, Stati Uniti d'America |
| Year | 2000 |
| Type | Articolo in rivista |
| Authors | CAROPPO C. |
| Text | 6359 2000 Phytoplankton Picophytoplankton Nutrients Diversity Coastal Ecosystem The contribution of picophytoplankton to community structure in a Mediterranean brackish environment. CAROPPO C. CNR ISMAR, CNR IAMC The seasonal composition of phytoplankton communities was investigated in a Mediterranean brackish area Varano lagoon . Twelve stations were sampled monthly from March 1997 to February 1998. Numbers of prokaryotic and eukaryotic picophytoplankton cells were estimated by epifluorescence microscopy, while larger phytoplankton nano and micro fractions were enumerated by the Utermohl settling technique. Picophytoplankton densities ranged from 0.7 to 448.6 cells 106 l 1. Nano and microphytoplankton abundances varied between 0.2 and 7.9 cells 106 l 1. The picoplankton fraction was represented mainly by cyanobacteria and the Utermohl fraction by nano sized phytoflagellates 56.2% and diatoms 20.1% . The phytoflagellates had a greater abundance over time while diatoms reached the highest densities in summer and fall. In Varano lagoon phytoplankton development is related to nitrogen poor waters and to phosphorus availability. Suspension feeding bivalves Mytilus galloprovincialis are sufficiently abundant to filter a volume equivalent to the volume of Varano lagoon at least once daily. These observation suggest that grazing exert an important influence on phytoplankton dynamics, mainly on the micro fraction, and the diatoms seem to play an important role in the food web dynamics of this coastal fishery. 22 Caroppo_2000_full Caroppo_2000_full.pdf Articolo in rivista Information Retrieval Inc. , 0142 7873 Journal of plankton research Journal of plankton research J. plankton res. Journal of plankton research. carmela.caroppo CAROPPO CARMELA TA.P04.002.001 Fascia Costiera e Ambienti di Transizione analisi strutturale e funzionale delle componenti biotiche ed abiotiche degli ecosistemi per lo sviluppo sostenibile delle attivita |