Erik Jeppesen

TY - JOUR

T1 - Responses of primary producers in shallow lakes to elevated temperature

T2 - a mesocosm experiment during the growing season of Potamogeton crispus

AU - Hao, Beibei

AU - Roejkjaer, Anna Fabrin

AU - Wu, Haoping

AU - Cao, Yu

AU - Jeppesen, Erik

AU - Li, Wei

PY - 2018/10

Y1 - 2018/10

N2 - Climate warming may influence the relationship among macrophyte-periphyton-phytoplankton and change the producer community structure in shallow lakes, as elevated temperature has been suggested to promote the dominance of phytoplankton. We performed a 5-month experiment (starting in winter, December) to elucidate the responses of three phototrophic communities (macrophyte-Potamogeton crispus, periphyton, phytoplankton) and their interactions to elevated temperature (4.5 A degrees C) under eutrophic, subtropical conditions. The biomass and composition of periphyton were not significantly affected by increased temperature, while the biomass of phytoplankton increased with a shift in phytoplankton composition towards higher dominance of chlorophytes and cyanobacteria. Warming also reduced the survival of P. crispus and accelerated the decline of P. crispus. At both ambient and heated temperatures, a shift occurred at the end of the experiment from a clear-state dominated by P. crispus to a clear-state dominated by filamentous algae and warming facilitated this shift. Our results thus indicated that, when submerged macrophytes diminished or disappeared, filamentous algae exhibited functional compensation that maintained low phytoplankton development, primarily at elevated temperatures.

AB - Climate warming may influence the relationship among macrophyte-periphyton-phytoplankton and change the producer community structure in shallow lakes, as elevated temperature has been suggested to promote the dominance of phytoplankton. We performed a 5-month experiment (starting in winter, December) to elucidate the responses of three phototrophic communities (macrophyte-Potamogeton crispus, periphyton, phytoplankton) and their interactions to elevated temperature (4.5 A degrees C) under eutrophic, subtropical conditions. The biomass and composition of periphyton were not significantly affected by increased temperature, while the biomass of phytoplankton increased with a shift in phytoplankton composition towards higher dominance of chlorophytes and cyanobacteria. Warming also reduced the survival of P. crispus and accelerated the decline of P. crispus. At both ambient and heated temperatures, a shift occurred at the end of the experiment from a clear-state dominated by P. crispus to a clear-state dominated by filamentous algae and warming facilitated this shift. Our results thus indicated that, when submerged macrophytes diminished or disappeared, filamentous algae exhibited functional compensation that maintained low phytoplankton development, primarily at elevated temperatures.

KW - Climate warming

KW - Periphyton

KW - Phytoplankton

KW - Filamentous algae

KW - Primary producers

KW - NORTH-ATLANTIC OSCILLATION

KW - GLOBAL CLIMATE-CHANGE

KW - SUBMERGED MACROPHYTES

KW - PLANKTON DYNAMICS

KW - HEAT-STRESS

KW - PHYTOPLANKTON

KW - GROWTH

KW - COMMUNITIES

KW - PERIPHYTON

KW - NITROGEN

U2 - 10.1007/s00027-018-0585-0

DO - 10.1007/s00027-018-0585-0

M3 - Journal article

VL - 80

JO - Aquatic Sciences

JF - Aquatic Sciences

SN - 1015-1621

IS - 4

M1 - 34

ER -