Environmental stoichiometry mediates phytoplankton diversity effects on communities' resource use efficiency and biomass

Gerhard, Miriam; Schlenker, Alexandra; Hillebrand, Helmut; Striebel, Maren

doi:10.1111/1365-2745.13811

Cited by 17 publications

(6 citation statements)

References 53 publications

(90 reference statements)

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“…POC is considered a proxy for microbial biomass, i.e., the sum of bacteria, protists and phytoplankton (Davidson et al, 2002;Gerhard et al, 2022;Poxleitner et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

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Dispersal provides trophic-level dependent insurance against a heatwave in freshwater ecosystems

Vad

Endrédi

Kratina

et al. 2022

Preprint

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Climate change-related heatwaves are major recent threats to biodiversity and ecosystem functioning. However, our current understanding of the mechanisms governing community resilience (resistance and recovery) to extreme temperature events is still rudimentary. The spatial insurance hypothesis postulates that diverse regional species pools can buffer ecosystem functioning against local disturbances through immigration of better adapted taxa. However, experimental evidence for such predictions from multi-trophic communities and pulse-type disturbances, like heatwaves, are largely missing. We performed an experimental mesocosm study with alpine lake plankton to test whether a dispersal event from natural lakes prior to a simulated heatwave could increase resistance and recovery of local communities. As the buffering effect of dispersal may differ among trophic groups, we independently manipulated dispersal of organisms from lower (microorganisms) and higher (zooplankton) trophic levels. The experimental heatwave suppressed total community biomass by having a strong negative effect on zooplankton biomass, probably due to a heat-induced increase in metabolic costs that in turn caused mortality. Heating thus resulted in weaker top-down control and a subsequent shift to bottom-heavy food webs. While zooplankton dispersal did not alleviate the negative heatwave effects on zooplankton biomass, dispersal of microorganism enhanced biomass recovery at the level of phytoplankton, thereby providing evidence for spatial insurance. The different response of trophic groups may be related to the timing of dispersal, which happened under strongly monopolized resource conditions by zooplankton, creating limited opportunity for competitors to establish. At the same time, the heatwave released phytoplankton from grazing pressure and increased nutrient recycling, which may have facilitated the establishment of new phytoplankton taxa. Our findings clearly show that even a short heatwave can strongly alter energy flow in aquatic ecosystems. Although dispersal can enhance community resilience, the strength of its buffering effects depends on the trophic level.

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“…POC is considered a proxy for microbial biomass, i.e., the sum of bacteria, protists and phytoplankton (Davidson et al, 2002;Gerhard et al, 2022;Poxleitner et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…POC is considered a proxy for microbial biomass, i.e., the sum of bacteria, protists and phytoplankton (Davidson et al, 2002; Gerhard et al, 2022; Poxleitner et al, 2016). Accordingly, we used POC (<100 μm fraction) as a proxy for the biomass of microorganisms.…”

Section: Methodsmentioning

confidence: 99%

Dispersal provides trophic-level dependent insurance against a heatwave in freshwater ecosystems

Vad

Endrédi

Kratina

et al. 2022

Preprint

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“…Nevertheless, in high-latitude areas, other factors besides the iron deficiency may also inhibit phytoplankton growth. Low temperatures (Rhee and Gotham, 1981), imbalanced nutritional stoichiometry (Gerhard et al, 2022), short days and prolonged cloud cover (ChrEilertsen and Degerlund, 2010), and grazing pressure (Dale et al, 1999) from higher trophic levels are some examples of these constraints. Leonard et al, 1999 accounted for iron limitation (nutrient compartment) in his extended NPZD model with the employment of nine compartments.…”

Section: Improving Nitrogen and Carbon Flux And Adding Other Elementsmentioning

confidence: 99%

Applications of biogeochemical models in different marine environments: a review

Ismail,

Al-Shehhi

2023

Front. Environ. Sci.

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Marine biogeochemical models are an effective tool for formulating hypothesis and gaining mechanistic understanding of how an ecosystem functions. This paper presents a comprehensive review of biogeochemical models and explores their applications in different marine ecosystems. It also assesses their performance in reproducing key biogeochemical components, such as chlorophyll-a, nutrients, carbon, and oxygen cycles. The study focuses on four distinct zones: tropical, temperate, polar/subpolar, and high nutrient low chlorophyll (HNLC). Each zone exhibits unique physical and biogeochemical characteristics, which are defined and used to evaluate the models’ performance. While biogeochemical models have demonstrated the ability to simulate various ecosystem components, limitations and assumptions persist. Thus, this review addresses these limitations and discusses the challenges and future developments of biogeochemical models. Key areas for improvement involve incorporating missing components such as viruses, archaea, mixotrophs, refining parameterizations for nitrogen transformations, detritus representation, and considering the interactions of fish and zooplankton within the models.

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“…As a result, urban wetlands' ecological functions and conservation needs may differ significantly from those of natural aquatic systems. Previous studies have focused mainly on the influence of phytoplankton diversity on RUE in river and lake ecosystems [25]. However, research is scarce in investigating how aquatic plants in urban wetlands influence RUE by affecting the water environment and phytoplankton diversity.…”

Section: Introductionmentioning

confidence: 99%

Effects of Aquatic Plant Coverage on Diversity and Resource Use Efficiency of Phytoplankton in Urban Wetlands: A Case Study in Jinan, China

Jiang,

Lu,

et al. 2024

Biology

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With the acceleration of urbanization, biodiversity and ecosystem functions of urban wetlands are facing serious challenges. The loss of aquatic plants in urban wetlands is becoming more frequent and intense due to human activities; nevertheless, the effects of aquatic plants on wetland ecosystems have received less attention. Therefore, we conducted field investigations across 10 urban wetlands in Jinan, Shandong Province, as a case in North China to examine the relationships between aquatic plant coverage and phytoplankton diversity, as well as resource use efficiency (RUE) in urban wetlands. Multivariate regression and partial least squares structural equation modeling (PLS-SEM) were used to analyze the water quality, phytoplankton diversity, and RUE. The results demonstrate that the increase in aquatic plant coverage significantly reduced the concentration of total nitrogen and suspended solids’ concentrations and significantly increased the phytoplankton diversity (e.g., species richness and functional diversity). The aquatic plant coverage significantly affected the composition of phytoplankton functional groups; for example, functional groups that had adapted to still-water and low-light conditions became dominant. Furthermore, the increase in phytoplankton diversity improved phytoplankton RUE, highlighting the importance of aquatic plants in maintaining wetland ecosystem functions. This study may provide a scientific basis for the management strategy of aquatic plants in urban wetlands, emphasizing the key role of appropriate aquatic plant cover in maintaining the ecological stability and ecosystem service functions of wetlands.

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Environmental stoichiometry mediates phytoplankton diversity effects on communities' resource use efficiency and biomass

Abstract: This is an open access article under the terms of the Creat ive Commo ns Attri bution-NonCo mmercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

Cited by 17 publications

References 53 publications

Dispersal provides trophic-level dependent insurance against a heatwave in freshwater ecosystems

Dispersal provides trophic-level dependent insurance against a heatwave in freshwater ecosystems

Applications of biogeochemical models in different marine environments: a review

Effects of Aquatic Plant Coverage on Diversity and Resource Use Efficiency of Phytoplankton in Urban Wetlands: A Case Study in Jinan, China

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