Biological and chemical characteristics of the coral gastric cavity |
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Authors: | S Agostini Y Suzuki T Higuchi B E Casareto K Yoshinaga Y Nakano H Fujimura |
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Institution: | (1) Shizuoka University, 836 Oya Suruga ku, Shizuoka 422-8529, Japan;(2) Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, 3422, Sesoko, Motobu, Okinawa 905-0227, Japan;(3) Department of Chemistry, Biology and Marine Science, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan |
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Abstract: | All corals have a common structure: two tissue layers enclose a lumen, which forms the gastric cavity. Few studies have described
the processes occurring inside the gastric cavity and its chemical and biological characteristics. Here, we show that the
coral gastric cavity has distinct chemical characteristics with respect to dissolved O2, pH, alkalinity, and nutrients (vitamin B12, nitrate, nitrite, ammonium, and phosphate) and also harbors a distinct bacterial community. From these results, the gastric
cavity can be described as a semi-closed sub-environment within the coral. Dissolved O2 shows very low constant concentrations in the deepest parts of the cavity, creating a compartmentalized, anoxic environment.
The pH is lower in the cavity than in the surrounding water and, like alkalinity, shows day/night variations different from
those of the surrounding water. Nutrient concentrations in the cavity are greater than the concentrations found in reef waters,
especially for phosphate and vitamin B12. The source of these nutrients may be internal production by symbiotic bacteria and/or the remineralization of organic matter
ingested or produced by the corals. The importance of the bacteria inhabiting the gastric cavity is supported by the finding
of a high bacterial abundance and a specific bacterial community with affiliation to bacteria found in other corals and in
the guts of other organisms. The findings presented here open a new area of research that may help us to understand the processes
that maintain coral health. |
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