Environmental Control of the Seasonal Growth of the Submersed Aquatic Macrophyte Lobelia dortmanna L

Leaf growth, photosynthesis and soluble carbohydrate content were measured for Lobelia dortmanna L. across one year in a small oligotrophic lochan in the northwest of Scotland at a number of sites, varying in degree of exposure, sediment type, nutrient concentrations and plant form. Leaf production...

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Bibliographic Details
Published in:The New phytologist 1987-06, Vol.106 (2), p.289-299
Main Authors: Farmer, Andrew M., David H. N. Spence
Format: Article
Language:English
Subjects:
Freshwater
growth
Irradiance
Leaves
light
Limnology
Lobelia dortmanna
Macrophytes
nutrients
oligotrophic lakes
Photosynthesis
Plant growth
Plant roots
Plants
Seasons
Sediments
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Summary:Leaf growth, photosynthesis and soluble carbohydrate content were measured for Lobelia dortmanna L. across one year in a small oligotrophic lochan in the northwest of Scotland at a number of sites, varying in degree of exposure, sediment type, nutrient concentrations and plant form. Leaf production and loss occurred during the entire year, although production and photosynthesis were maximal in the early summer. Soluble carbohydrate was highest in the early spring, and was lowest when leaf production was greatest. Environmental changes (solar irradiance, lochan temperature and water levels) were also related to growth rates, showing a particularly strong correlation between irradiance and the relative leaf growth rate. Little influence of epiphytes or limitation of growth by nutrient or the contribution of inorganic carbon was found.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.1987.tb00144.x