Multiple stressors on coral reefs: a long-term prespective

Article Abstract:

Studying single coral reef events in isolation can be misleading and a longer term approach is needed for understanding responses of the reef assemblages to multiple stressors. Such reefs are affected by a high frequency of recurring physical and biological stressors, often with large spatial scale and/or temporal scale, that makes them difficult to study. Previous perturbations impact a new disturbance in many cases. Different results can come from similar events depending on other events, and a blurring of single and multiple stressors can result. With longer time scales multiple stressors may have significant or crucial effects on recruitment and regeneration of assemblages and in other ways. A brief review of the impacts of physical disturbance is given with special attention to repeat events and two very detailed long-term sets of data for Heron Island, Australia, and Jamaica are presented with an eye to multiple stressors and complexities, both natural and coming from man.

United States, Methods, Environmental aspects, Science, Scientific method, Hurricanes, Coral reefs and islands, Coral reefs, Marine ecology, Cyclones, Windstorms

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Relationship between light and the delta15-N of coral tissue: examples from Jamaica and Zanzibar

Article Abstract:

Corals with symbiotic zooxanthellae have a nitrogen isotopic composition that is affected by light, according to analysis of samples from Jamaica and Zanzibar. Under conditions of high irradiance, the coral internal pool of dissolved inorganic nitrogen (DIN) appears to become depleted through uptake and assimilation by the symbiotic algae and/or the host, and fractionation is reduced. In conditions of lower light, fractionation increases as less dissolved nitrogen is assimilated. Delta15-N is lower in coral tissues when the light is lower.

Tanzania, Nitrogen, Nitrogen isotopes

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A tank system for studying benthic aquatic organisms at predictable levels of turbidity and sedimentation: case study examining coral growth

Article Abstract:

A tank system for studying benthic aquatic organisms is discussed with information about a case study that looked at coral growth. The tanks can be used to set up defined levels of turbidity and sedimentation for low-technology studies that need natural flowing seawater for sessile organisms over long periods. Suspended particulate matter (SPM) concentrations can be important in studying heterotrophic species in which growth might be closely related to particle quality.

Statistical Data Included, Equipment and supplies, Design and construction, Oceanographic research, Benthos, Benthic zone, Tanks, Tanks (Containers), Aquatic biology

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