Cold-Water Corals and Ecosystems (Erlangen Earth Conference by Andre Freiwald (Editor)

By Andre Freiwald (Editor)

Following the intriguing exploration of scorching vent and chilly seep ecosystems, the rediscovery of cold-water coral ecosystems with high-technology instrumentation is at present one other sizzling subject in multidisciplinary marine examine. Conventionally, coral reefs are considered as constrained to hot and well-illuminated tropical seas, now not linked to chilly and darkish waters of upper latitudes. besides the fact that, ongoing clinical missions have make clear the worldwide importance of this ignored environment. Cold-water coral ecosystems are excited about the formation of huge seabed buildings corresponding to reefs and enormous carbonate mounds, and so they characterize unexploited paleo-environmental documents of earth background. Like their tropical cousins, cold-water coral ecosystems harbour wealthy species variety. regardless of the good water depths, advertisement pursuits overlap progressively more with the coral occurrences. Human actions already impinge without delay on cold-water coral reefs inflicting serious! harm to this weak surroundings. during this quantity, the present key associations inquisitive about cold-water coral learn have contributed sixty two state of the art articles from geology and oceanography to biology and conservation.

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Extra resources for Cold-Water Corals and Ecosystems (Erlangen Earth Conference Series)

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Molluscs) are represented with many taxa that are not treated here (see Bernecker and Weidlich 1990 for further references). Dendroid scleractinian corals: The dominant mound-forming corals (Fig. 5) are three genera comprising the species Dendrophyllia candelabrum Henning, 1899, Faksephyllia faxoensis (Beck, 1835) and Oculina becki (Nielsen, 1922). They can be distinguished easily by diameter, wall structure and the mode of budding. D. candelabrum (Fig. 6/1, A) is the most common dendroid coral.

Most of the sediments occurring within the mounds and surrounding the mounds seem to be of parautochthonous origin. The varying content of broken coral branches is obvious in rock slabs. Modal analysis indicates that the percentage of corals varies between 10-30 %. 1 mm and 50 cm. Colonial corals in life position are common. Pelagic skeletal grains, such as coccoliths and globigerinids, are important constituents of the lime mud. They are frequent and occur in all subfacies types of the coral limestone.

From the Late Maastrichtian-Middle Danian, four sequence boundaries were observed in the Danish basin (Surlyk 1997). During this time interval, sea level was highest during the Late Maastrichtian. Prominent lowstands occur at the K/T boundary (Fish Clay), overlying the Cerithium Limestone, at the end of Early and Middle Danian, and within the Middle Danian (Fig. 2). With the exception of the K/T boundary, sea level lowstands are indicated by hardgrounds and caused no significant change in the sedimentologic patterns.

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