Saltvandsforum.dk

Carsten skrev:Kan godt se ideen med at hæve stenene, så slammet kan fjernes.

Photosynthesis utilizes the sunlight’s energy to “fix” (= attach) inorganic carbon in the form of CO2 to organic chemical structures that eventually become carbohydrates. These carbohydrate building blocks are chemically manipulated further by the zooxanthellae and/or the coral host and then secreted by the coral as coral mucus (a combination of complex polysaccharides, amino acid oligomers/polymers, lipids, etc.. The carbohydrates and amino acids within the mucus serve as food sources for the bacteria and other microbiota that comprise the foundation of the marine food pyramid (Kirchman, 1990; Rich, 1996; Weiss, 1999; Wild, 2004; Sharon, 2008).

Zooxanthellae, endosymbiotic algae of reef-building corals, substantially contribute to the high gross primary production of coral reefs1, but corals exude up to half of the carbon assimilated by their zooxanthellae as mucus2, 3. Here we show that released coral mucus efficiently traps organic matter from the water column and rapidly carries energy and nutrients to the reef lagoon sediment, which acts as a biocatalytic mineralizing filter. In the Great Barrier Reef, the dominant genus of hard corals, Acropora, exudes up to 4.8 litres of mucus per square metre of reef area per day. Between 56% and 80% of this mucus dissolves in the reef water, which is filtered through the lagoon sands. Here, coral mucus is degraded at a turnover rate of at least 7% per hour. Detached undissolved mucus traps suspended particles, increasing its initial organic carbon and nitrogen content by three orders of magnitude within 2 h. Tidal currents concentrate these mucus aggregates into the lagoon, where they rapidly settle. Coral mucus provides light energy harvested by the zooxanthellae and trapped particles to the heterotrophic reef community, thereby establishing a recycling loop that supports benthic life, while reducing loss of energy and nutrients from the reef ecosystem.

gas skrev:der skulle ikke komme til at ligge noget med alt det Cirkulations der kommer til at være retur punp er en deltec 5250 også kommer der 3 6045 og en 6065 og 6055 men ved ikke

Meller skrev:Kan det ikke med fordel laves til DSB? eller misforstår jeg noget
syntes det ser ret fedt ud, men ja der er ikke meget plads over stensætningen

gas skrev:en dsb hvor dyb skal den være

ole. skrev:

gas skrev:en dsb hvor dyb skal den være

10-15cm,kornstørrelse 0.5mm

Schwensen skrev:

ole. skrev:

gas skrev:en dsb hvor dyb skal den være

10-15cm,kornstørrelse 0.5mm

Nu er det overhovedet ikke for skulle spille klog på DSB, for det er jeg ikke, men jeg læste tilfældigvis lige en artikel af Ron S. igår omkring opsætning af DSB. Han anbefaler en kornstørrelse på 0,125 mm. Er det fordi det mindste man i Danmark kan få er 0,5 mm du siger det Ole?

http://www.ronshimek.com/deep_sand_beds.html" onclick="window.open(this.href);return false;

gas skrev:okay det var dybt synes jeg har hørt at 8 cm var nok