TY  - JOUR
A1  - Périllon, Cécile
A1  - Hilt, Sabine
T1  - Groundwater influence differentially affects periphyton and macrophyte production in lakes
JF  - Hydrobiologia : acta hydrobiologica, hydrographica, limnologica et protistologica
N2  - Groundwater influx can significantly contribute to nutrient and carbon budgets of lakes, and its influence is the strongest in littoral areas dominated by macrophytes and periphyton. We have reviewed the effects of groundwater-borne nitrogen and phosphorus and dissolved inorganic and organic carbon (DIC, DOC) on these benthic primary producers in lakes. We develop a hypothesis for groundwater effects including the less studied impacts of periphyton shading on macrophytes. Groundwater-borne nutrients and DIC promote both macrophytes and periphyton. Direct studies on groundwater-borne DOC effects are lacking, but coloured DOC contributes to light attenuation and thus can restrict the growth of benthic primary producers. We predict that above certain threshold levels of nutrient influx by groundwater, periphyton and macrophyte biomass should decline owing to shading by phytoplankton and periphyton, respectively. However, because of their higher light requirements, those thresholds should be lower for macrophytes. For macrophytes, a threshold level is also predicted for a shift from DIC limitation to light limitation. Differences in light requirements are expected to result in lower thresholds of DOC loading for declines of macrophytes than periphyton.
KW  - Dissolved inorganic carbon
KW  - Dissolved organic carbon
KW  - Light
KW  - Macrophytes
KW  - Nutrients
KW  - Periphyton
Y1  - 2016
U6  - https://doi.org/10.1007/s10750-015-2485-9
SN  - 0018-8158
SN  - 1573-5117
VL  - 778
SP  - 91
EP  - 103
PB  - Springer
CY  - Dordrecht
ER  -