Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Effects of macro-detritivores density on leaf detritus processing rate: a macrocosm experiment |
| Abstract | The effect of macroinvertebrate detritivore density on the mass loss rates of leaf litter of Alnus glutinosa (alder) was assessed. Experimental freshwater macrocosms, with increasing densities of four species of macroinvertebrate detritivores belonging to two functional groups (shredders and scrapers), were set up outdoors. The litter bag technique was used to assess decomposition rates of alder leaves. Indirect effects of increasing density of macroinvertebrates on phytoplankton standing crop in the water column were investigated by analysing Chlorophyll a concentration. Decomposition rate increased as animal density increased, although a continuous increase in detritivores density resulted in a discrete, step-wise increase of the decomposition rates. Animal colonisation followed an exponential pattern in low-medium density treatments versus a typical 'bell-shape' curve in high density treatments; animals started to leave the consumed patches when about 60% of the initial leaf mass was lost (35th day in highdensity treatments). Diversity (Hs) of the simplified detritivore community decreased as decomposition proceeded, with a dominance of shredders during the last phase of decomposition. Faster decomposition rate of detritus in the benthic compartment lead to a higher microalgae standing crop in the water column emphasising the role of allochthonous detritus as a source of nutrients for algae primary production in coastal freshwater ecotones. |
| Source | Hydrobiologia (The Hague. Print) 435, pp. 127–134 |
| Keywords | Detritus processingMacroinvertebrate density |
| Journal | Hydrobiologia (The Hague. Print) |
| Editor | Kluwer Academic Publishers, Boston, Paesi Bassi |
| Year | 2000 |
| Type | Articolo in rivista |
| Authors | Fazi S, Rossi L. |
| Text | 228431 2000 Detritus processing Macroinvertebrate density Effects of macro detritivores density on leaf detritus processing rate a macrocosm experiment Fazi S, Rossi L. Department of Genetics and Molecular Biology, Ecology. University of Rome La Sapienza , Via Lancisi 29, 00161 Roma, Italy The effect of macroinvertebrate detritivore density on the mass loss rates of leaf litter of Alnus glutinosa alder was assessed. Experimental freshwater macrocosms, with increasing densities of four species of macroinvertebrate detritivores belonging to two functional groups shredders and scrapers , were set up outdoors. The litter bag technique was used to assess decomposition rates of alder leaves. Indirect effects of increasing density of macroinvertebrates on phytoplankton standing crop in the water column were investigated by analysing Chlorophyll a concentration. Decomposition rate increased as animal density increased, although a continuous increase in detritivores density resulted in a discrete, step wise increase of the decomposition rates. Animal colonisation followed an exponential pattern in low medium density treatments versus a typical bell shape curve in high density treatments; animals started to leave the consumed patches when about 60% of the initial leaf mass was lost 35th day in highdensity treatments . Diversity Hs of the simplified detritivore community decreased as decomposition proceeded, with a dominance of shredders during the last phase of decomposition. Faster decomposition rate of detritus in the benthic compartment lead to a higher microalgae standing crop in the water column emphasising the role of allochthonous detritus as a source of nutrients for algae primary production in coastal freshwater ecotones. 435 Fazi e Rossi 2000 Fazi_and_Rossi_Hyd_00.pdf Articolo in rivista Kluwer Academic Publishers 0018 8158 Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia. The Hague. Print Hydrobiologia Dordrecht The Hague. Print Hydrobiologia Boston The Hague. Print Hydrobiologia London The Hague. Print stefano.fazi FAZI STEFANO |