Enzymatically hydrolyzable protein and carbohydrate sedimentary pools as indicators of the trophic state of detritus sink system: a case study in a Mediterranean Coastal lagoon (Articolo in rivista)

Type
Label
  • Enzymatically hydrolyzable protein and carbohydrate sedimentary pools as indicators of the trophic state of detritus sink system: a case study in a Mediterranean Coastal lagoon (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Pusceddu A., Dell?Anno A., Danovaro R., Manini E., Sarà G., Fabiano M. (2003)
    Enzymatically hydrolyzable protein and carbohydrate sedimentary pools as indicators of the trophic state of detritus sink system: a case study in a Mediterranean Coastal lagoon
    in Estuaries
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Pusceddu A., Dell?Anno A., Danovaro R., Manini E., Sarà G., Fabiano M. (literal)
Pagina inizio
  • 641 (literal)
Pagina fine
  • 650 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 26 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Enzymatically hydrolyzable protein and carbohydrate sedimentary pools as indicators of the trophic state of detritus sink system: a case study in a Mediterranean Coastal lagoon (literal)
Abstract
  • In order to classify the trophic state of 'detritus sink' systems, instead of the conventional indicators based on inorganic nutrient availability and algal biomass and productivity in the water column, we utilized new biochemical descriptors based on the amount of sedimentary organic carbon and nitrogen potentially available to heterotrophic nutrition. We investigated spatial and temporal changes in microphytobenthic biomass, organic matter biochemical composition and enzymatically hydrolyzable protein and carbohydrate pools along a N-S transect in the Marsala lagoon (Mediterranean Sea, Italy) at three stations characterized by different hydrodynamic conditions and organic matter content in the sediment. The Marsala lagoon displayed a southward decreasing pattern of the hydrodynamic regime reflected by organic matter distribution and composition. Sediment organic matter concentrations were among the highest reported in the literature and, in the central area, where large meadows of the seagrass Posidonia oceanica were present, displayed a strong dominance of highly refractory carbohydrates. The resulting protein to carbohydrate ratio was always <1, indicating the dominance of aged organic detritus. Microphytobenthic biomass displayed a southward increasing pattern and its contribution to the biopolymeric carbon pools ranged from negligible in the central sector of the lagoon to ca 50% in its northern part, indicating that also sources of sediment organic carbon changed according to the hydrodynamic gradient. The percentage contribution of the enzymatically hydrolyzable fraction of proteins and carbohydrates was inversely related with total protein and total carbohydrate concentrations, respectively, suggesting that bioavailability of organic carbon and nitrogen increased with decreasing organic matter content in the sediment and with increasing hydrodynamic regime. Microphytobenthic contribution to biopolymeric C (as a proxy of autotrophic organic C) and the ratio of the enzymatically digestible fraction to biopolymeric C (as an indicator of organic matter lability) were significantly correlated, suggesting that chlorophyll-a sediment content might be used as an indicator of food promptly available to consumers. The present study also allowed highlighting that the ratio of labile (i.e. enzymatically digestible) vs. biopolymeric organic carbon in the sediments tends to decrease with increasing organic matter content, due to the increase of the refractory fraction of organic carbon. (literal)
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