1,721,019 research outputs found
Marine phytoplankton size-frequency distributions: spatial patterns and decoding mechanisms.
No full textIdentificazione e caratterizzazione degli ambienti acquatici di transizione: risultati di una indagine italiana a livello nazionale. Atti Workshop APAT su Monitoraggio delle acque di transizione
No full textMetodologie per la determinazione della struttura dimensionale di fitoplancton e macroinvertebrati bentonici.
No full textColonization of ephemeral detrital patches by vagile macroinvertebrates in a brackish lake: a body size-related process?
No full textThe mechanisms regulating the build-up of invertebrate assemblages on ephemeral detritus patches are still poorly understood. Here, the daily colonization of decaying reed leaves by vagile macroinvertebrates was monitored in an brackish lake in Italy. The highly variable abundance patterns of dominant taxa were analysed by spectral and geostatistical techniques to test for nonrandomness and to further determine whether they were related to body size. Comparisons between two contrasting sites allowed an assessment of the generality of our observations. At both sites, the macroinvertebrate assemblage was dominated by three detritivorous taxa, i.e. the isopod Lekanesphaera monodi, the amphipod Microdeutopus gryllotalpa and the polychaete Neanthes caudata. Overall, their abundance patterns were characterised by short-term fluctuations of a nonrandom, autocorrelated nature. In addition, a significant covariation was observed between the average body mass of each taxon and the complexity of the respective abundance pattern, expressed by the fractal dimension D. The covariation was observed at both study sites, notwithstanding the diverging outcomes of bivariate pattern comparisons for similar-sized taxa. Our findings indicate that the size of macroinvertebrates is strongly related to the short-term dynamics of their abundance patterns on reed detritus, suggesting that the interaction between vagile consumers and ephemeral resource patches might be influenced by individual energetics. The implications of size-related constraints for the coexistence of species on decaying detrital patches are discusse
Intra-habitat variation of ecosystem structure and function: a study in a volcanic lake.
No full textIfrane (Morocco
Struttura della fascia costiera lacustre e processo di decomposizione nel corpo d’acqua: un approccio all’uso del remote sensing nell’indagine funzionale in ecologia.
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Cartografia delle caratteristiche funzionali dell'ecosistema per la realizzazione di una Carta della Natura multiscalare
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