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<p>Climate change can alter nutrient availability in lake ecosystems, affecting primary producers such as periphytic algae. We investigated the effect of winter warming on biomass, algal species composition, and phosphorus content in periphyton during colonization in an N-enriched environment. The experiment was conducted in mesocosms placed inside two climate-controlled chambers, simulating current winter and future warming conditions (+ 5.7&#xa0;°C, Intergovernmental Panel on Climate Change (IPCC), in: Contribution of working group I to the sixth assessment report of the IPCC, Cambridge University Press, Cambridge, 2021). Two treatments were applied (<i>n</i> = 4): N addition without warming, and N addition with warming. Water sampling for the determination of abiotic variables and periphyton sampling were weekly (days 3, 10, 17, and 24) and with sampling events interspersed with monitoring periods. Warming affected abiotic conditions, especially DIN concentrations, which was significantly reduced, leading to N-limitation. Warming caused losses in biomass, algal biovolume, and TP content in periphyton. Warming changed algal species composition throughout colonization, favoring mixotrophic species and small desmids (&gt; 20&#xa0;μm). A negative relationship was observed between periphyton and phytoplankton chlorophyll <i>a</i>. The results suggest that synergistic effect of global warming and N-loading may compromise the ecological role of periphyton in shallow tropical lakes, reducing their total phosphorus retention capacity, biomass accumulation, and altering the descriptor species. This study contributes to improving the predictability of periphyton changes under a future global warming scenario.</p>

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Warming effects on TP content, algal biomass and composition in periphyton under N-enriched conditions

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • G. J. Lavagnolli,
  • L. Tristão-Silva,
  • C. Ferragut

摘要

Climate change can alter nutrient availability in lake ecosystems, affecting primary producers such as periphytic algae. We investigated the effect of winter warming on biomass, algal species composition, and phosphorus content in periphyton during colonization in an N-enriched environment. The experiment was conducted in mesocosms placed inside two climate-controlled chambers, simulating current winter and future warming conditions (+ 5.7 °C, Intergovernmental Panel on Climate Change (IPCC), in: Contribution of working group I to the sixth assessment report of the IPCC, Cambridge University Press, Cambridge, 2021). Two treatments were applied (n = 4): N addition without warming, and N addition with warming. Water sampling for the determination of abiotic variables and periphyton sampling were weekly (days 3, 10, 17, and 24) and with sampling events interspersed with monitoring periods. Warming affected abiotic conditions, especially DIN concentrations, which was significantly reduced, leading to N-limitation. Warming caused losses in biomass, algal biovolume, and TP content in periphyton. Warming changed algal species composition throughout colonization, favoring mixotrophic species and small desmids (> 20 μm). A negative relationship was observed between periphyton and phytoplankton chlorophyll a. The results suggest that synergistic effect of global warming and N-loading may compromise the ecological role of periphyton in shallow tropical lakes, reducing their total phosphorus retention capacity, biomass accumulation, and altering the descriptor species. This study contributes to improving the predictability of periphyton changes under a future global warming scenario.