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A platform for research: civil engineering, architecture and urbanism
Incident Ultraviolet Radiation and Disappearance of the Aquatic Macrophyte Egeria densain a Ramsar Wetlands Site
10.1002/clen.200800135.abs
During mid 2004, abrupt environmental changes including a massive die off of the dominant macrophyteEgeria densawere observed within the wetlands of Río Cruces, a Ramsar site in southern Chile. One of the hypotheses presented to explain these changes was that increased ultraviolet radiation (UVR) may have been responsible. Since variation in UVR operates at regional scales, it is important to understand if the demise of E.densa also occurs at concurrent spatial and temporal scales. The current results demonstrate that monthly and annual variability of UVB was very stable during 1998 to 2006. Furthermore, in situ vertical profiles sampled across the wetlands and nearby rivers showed that UVR penetrates deeper into waters located outside the wetlands, where healthy stands of E.densa are commonly seen. The massive die off ofE. densa within the Río Cruces wetlands cannot be explained by regional variability in UVR, and it is much more likely that the definitive reason is found locally within the wetlands rather than regionally.
Incident Ultraviolet Radiation and Disappearance of the Aquatic Macrophyte Egeria densain a Ramsar Wetlands Site
10.1002/clen.200800135.abs
During mid 2004, abrupt environmental changes including a massive die off of the dominant macrophyteEgeria densawere observed within the wetlands of Río Cruces, a Ramsar site in southern Chile. One of the hypotheses presented to explain these changes was that increased ultraviolet radiation (UVR) may have been responsible. Since variation in UVR operates at regional scales, it is important to understand if the demise of E.densa also occurs at concurrent spatial and temporal scales. The current results demonstrate that monthly and annual variability of UVB was very stable during 1998 to 2006. Furthermore, in situ vertical profiles sampled across the wetlands and nearby rivers showed that UVR penetrates deeper into waters located outside the wetlands, where healthy stands of E.densa are commonly seen. The massive die off ofE. densa within the Río Cruces wetlands cannot be explained by regional variability in UVR, and it is much more likely that the definitive reason is found locally within the wetlands rather than regionally.
Incident Ultraviolet Radiation and Disappearance of the Aquatic Macrophyte Egeria densain a Ramsar Wetlands Site
Lovengreen, Charlotte (author) / Morrow, John (author) / Jaramillo, Eduardo (author) / Lagos, Nelson A. (author) / Contreras, Heraldo (author) / Duarte, Cristian (author)
CLEAN – Soil, Air, Water ; 36 ; 858-862
2008-11-01
5 pages
Article (Journal)
Electronic Resource
English
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