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Photosynthetic Production of a Brackish Water Community of Chara tomentosa L. and its Dependence on Environmental Conditions
Author(s) -
Libbert Eike,
Walter Thomas
Publication year - 1985
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19850700305
Subject(s) - photosynthesis , brackish water , salinity , respiration , biology , primary production , botany , environmental science , ecology , ecosystem
Net photosynthesis and dark respiration of a natural Chara tomentosa community were continuously recorded. There is a close correlation between net rate of photosynthesis and variations in the PhAR flux under water. The net photosynthesis fluence Px correlates with the PhAR fluence Ix , but the quotient Px/Ix varies seasonally, apparently as a consequence of variations in chlorophyll content following long‐range changes in radiation fluence. No influence of temperature, salinity or pH on net photosynthesis was detected, but water temperature stimulates dark respiration and consequently diminishes net primary production.