Sunspots drive seagrasses |
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Authors: | Leonardo V Marques Frederick T Short |
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Institution: | 1. Laboratório de Ecologia Marinha Bêntica, Departamento de Ecologia – IBRAG, Universidade do Estado do Rio de Janeiro, Rua S?o Francisco Xavier 524, PHLC Sala 525/3, 20550-900 Rio de Janeiro, Brazil;2. Jackson Estuarine Laboratory, Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, USA |
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Abstract: | Seagrasses are underwater flowering plants that form an important marine habitat worldwide. They respond to watershed and climate influences and are considered a good indicator of environmental health. Investigations into seagrass photosynthesis, response to high irradiance and UV light are providing new insights into controls on plant production. We show that the size and density of the intertidal seagrass directly relates to sunspot activity. The influence of sunspot activity has been largely overlooked in plants and never examined in seagrasses. The correlation between seagrass canopy height and the number of sunspots was highly significant, with height decreasing steadily as sunspots increase and recover only after a substantial decline in sunspot activity. The density of seagrass shoots correlated positively with sunspots until, at high sunspot numbers (>110 per month), plant density dropped and then rebounded. High sunspot activity inhibits the production and alters the meadow structure of tropical intertidal seagrass habitats. |
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Keywords: | Halodule wrightii sunspot activity long-term monitoring seagrass |
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