Mean redox potential values in surface sediments along the transect D in the Cretan Sea (Table 1)
Cobertura |
MEDIAN LATITUDE: 35.316545 * MEDIAN LONGITUDE: 25.140000 * SOUTH-BOUND LATITUDE: 35.240000 * WEST-BOUND LONGITUDE: 25.140000 * NORTH-BOUND LATITUDE: 35.420000 * EAST-BOUND LONGITUDE: 25.140000 * DATE/TIME START: 1994-08-01T00:00:00 * DATE/TIME END: 1995-09-01T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.00 m * MAXIMUM DEPTH, sediment/rock: 0.14 m |
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Data(s) |
26/04/2000
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Resumo |
The seasonal, spatial and bathymetric changes in the distribution of chloroplastic pigments (Chl a, phaeopigments and CPE), TOC, TON, ATP, bottom water nutrient content and the main biochemical classes of organic compounds (lipids, proteins and carbohydrates) were recorded from May 1994 to September 1995 over the continental margin of northern Crete. The concentration of chloroplastic pigment equivalents (CPE) was always low, dropping dramatically along the shelf-slope gradient. Microbial activity (ATP) also dropped sharply beyond the continental shelf following a distribution pattern similar to TOC and TON. Lipid, protein and carbohydrate concentrations, as well as biopolymeric carbon were comparable to those reported for other more productive areas, however, the quality of the organic matter itself was rather poor. Thus, carbohydrates, the dominant biochemical class, were characterised by being highly (80-99%) refractory, as soluble carbohydrates represented (on annual average) only 6% of the total carbohydrate pool. Protein and lipid concentrations strongly decreased with depth, indicating depletion of trophic resources in the bathyal zone. Proteins appeared to be the more degradable compounds and indeed the protein to carbohydrate ratios were found to decrease strongly in the deeper stations. Organic matter content and quality decreased both with increasing distance from the coast and within the sediment. All sedimentary organic compounds were found to vary between sampling periods, with the changes being more pronounced over the continental shelf. The different temporal patterns of the various components suggest a different composition and/or origin of the OM inputs during the different sampling periods. The amount of material reaching the sediments below 540 m is extremely low, suggesting that most of the organic material is decomposed and/or utilised before reaching the sea floor. In conclusion, the continental shelf and bathyal sediments of the Cretan Sea can be considered, from a trophic point of view, as two different subsystems. |
Formato |
text/tab-separated-values, 219 data points |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.759807 doi:10.1594/PANGAEA.759807 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
Danovaro, Roberto; Marrale, Daniela; Dell'Anno, Antonio; Della Croce, Norberto; Tselepides, Anastasios; Fabiano, Mauro (2000): Bacterial response to seasonal changes in labile organic matter composition on the continental shelf and bathyal sediments of the Cretan Sea. Progress in Oceanography, 46/2-4, 345-366, doi:10.1016/S0079-6611(00)00025-2 Danovaro, Roberto; Tselepides, Anastasios; Otegui, Ana; Della Croce, Norberto (2000): Dynamics of meiofaunal assemblages on the continental shelf and deep-sea sediments of the Cretan Sea (NE Mediterranean): Relationships with seasonal changes in food supply. Progress in Oceanography, 46/2-4, 367-400, doi:10.1016/S0079-6611(00)00026-4 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Tselepides, Anastasios; Polychronaki, Thalia; Marrale, Daniela; Akoumianaki, I; Dell'Anno, Antonio; Pusceddu, Antonio; Danovaro, Roberto (2000): Organic matter composition of the continental shelf and bathyal sediments of the Cretan Sea (NE Mediterranean). Progress in Oceanography, 46/2-4, 311-344, doi:10.1016/S0079-6611(00)00024-0 |
Palavras-Chave | #Cretan Sea; D1-D7; Depth, bathymetric; DEPTH, sediment/rock; HERMES; Hotspot Ecosystem Research on the Margins of European Seas; LATITUDE; LONGITUDE; Oxidation reduction (RedOx) potential; Sample code/label; Standard deviation |
Tipo |
Dataset |