Description: Das Projekt "Produktivitaet und Karbonatproduktion von Riffoekosystemen" wird vom Umweltbundesamt gefördert und von Universität Köln, Zoologisches Institut, Arbeitsgruppe Marine Ökophysiologie durchgeführt. Growth rates of entire coral colonies in the Gulf of Aqaba are species-specific and depend upon the water depth level. Water depth is an environmental factor comprising several subfactors, such as: gradients in radiation, temperature, salinity and pressure. Incorporating water movement, substrate properties substrate inclination and the availability of POM. Each of the above listed subfactors can potentially influence the carbonate production. In our field studies we are particularly interested in energy deliviering processes involved in calcification. In zooxanthellate, hermatypic coral species growth and carbonate production depends on metabolic energy, which may originate from all of the four nutritional pathways mentioned above. We tried to quantify the availability of POM and irradiance with carbonate production in bathymetric dependence and in an annual cycle. Species-specific differences in colonial carbonate production exist the whole year round independent of growing depths and exhibit a maximum during the summer months. The absolute increment of carbonate decreases in all species as a function of depth. At different depth levels studied (2, 10, 20, 40 m) the carbonate production of the different species apprears similar when realted to the surface of the skeletogenic tissue. The annual availability of POM (we determined the amount of organic carbon in the sediment and the seston) does not correlate with carbonate production. The annual skeletal mass increment corrlates best with seasonal changes of irradiance, a fact which supports the importance of the zooxanthellae in calcification.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Köln ? Ökophysiologie ? Substrat ? Carbonat ? Koralle ? Organischer Kohlenstoff ? Temperaturabhängigkeit ? Wassertemperatur ? Korallenriff ? Marines Ökosystem ? Seston ? Strahlung ? Salzgehalt ? Gewässervermessung ? Gesamter organischer Kohlenstoff ? Beleuchtungsstärke ? Energie ? Feldstudie ? Sediment ? Wasser ? Biologische Aktivität ? Ökologischer Faktor ? Produktivität ? Karbonatproduktion ? Riff ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1991-01-01 - 1997-12-31
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