Anchor qea water quality and sediment monitoring report lower newport bay federal dredging9/16/2023 ![]() Seagrasses use HCO 3 − inefficiently as a carbon source, thus photosynthesis is not always saturated with respect to DIC at natural seawater concentrations leading to carbon limitation for seagrass growth. ![]() It has been demonstrated that seagrasses can assimilate nutrients through both leaf and root tissues, often with equal uptake contributions from water column and sediment nutrients. However, productivity in persistent seagrasses is likely controlled by nutrient availability, including both water column and sediment nutrients. The optimal growth temperature for temperate species range between 11.5 ☌ and 26 ☌, whereas the optimal growth temperature for tropical/subtropical species is between 23 ☌ and 32 ☌. Furthermore, both thermal adaptation and thermal tolerance contribute greatly to seagrass global distributions. Annual temperatures, which are highly predictable in aquatic systems, play an important role in controlling site specific seasonal seagrass growth. Seagrasses can enhance light harvesting efficiencies through photo-acclimation during low light conditions, and thus plants growing near their depth limit may have higher photosynthetic efficiencies. Minimum light requirements for seagrass growth vary among species due to unique physiological and morphological adaptations of each species, and within species due to photo-acclimation to local light regimes. ![]() Light, temperature, and inorganic nutrients affect biochemical processes of organisms, and are considered as major factors controlling seagrass growth. Productivity of seagrasses can be controlled by physiological processes, as well as various biotic and abiotic factors that influence plant metabolism.
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