Moderate and extreme warming under a varied resource supply alter the microzooplankton–phytoplankton coupling in North Sea coastal communities DOI Creative Commons
Marco J. Cabrerizo, Anika Happe, Antonia Ahme

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Abstract Rising temperature is one of the most visible effects global change on Earth; however, it barely known how moderate or extreme warming events impact trophic interactions and energy transfer in food webs. Combining a mesocosm approach two‐point dilution incubations, we quantified natural plankton assemblages respond to (+6°C vs. +12°C above ambient temperature), covering nitrogen‐to‐phosphorus gradient from nutrient‐saturated limited conditions. We addressed both drivers altered community structure mediated phytoplankton growth ( μ ) microzooplankton grazing m rates. Moderate microzooplankton–phytoplankton relationship differed were by time. This interaction was weakened due outpacing regardless treatment at middle experiment. By contrast, after acclimation period, strengthened increased under warming. The variable pressure found different temporal scales only could be decreased with increasing when prey biomass low, vice versa. Also, consequence switch toward mixotrophy that temperatures experienced grazers suboptimal compared their prey. Finally, main driver whereas resource availability played minor role this interaction. As climate will intensify future, webs less productive but more efficient, thus, potentially support higher secondary production.

Language: Английский

Concurrent global change and marine heatwaves disturb phototrophic more than heterotrophic protist diversity DOI Creative Commons
Antonia Ahme, Inga V. Kirstein, Cédric L. Meunier

et al.

Limnology and Oceanography Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

Abstract Anthropogenic pressures like ocean warming, acidification, rising N : P ratios, and marine heatwaves (MHWs) are affecting eukaryotic plankton diversity, though their combined impacts rarely studied. To address this, we conducted a mesocosm experiment on North Sea community, testing the influence of MHW under ambient future environmental conditions. Using 18S rRNA amplicon sequencing, found that global change generally reduced protist in particular phototrophic organisms. While heterotrophs were largely unaffected by heatwaves, diversity declined especially during cooling only recovered Global shifted community from nano‐ to pico‐sized phototrophs increased harmful algae bloom species parasites, while elevated ochrophytes. The coccolithophore Gephyrocapsa oceanica thrived both stressors. Our findings suggest changing baseline conditions extreme events can differentially impact heterotrophic with potential consequences for metabolic balance communities.

Language: Английский

Citations

0
The experimental implications of the rate of temperature change and timing of nutrient availability on growth and stoichiometry of a natural marine phytoplankton community DOI Creative Commons
Anika Happe, Antonia Ahme, Marco J. Cabrerizo

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(8), P. 1769 - 1781

Published: July 8, 2024

Abstract Climate change increases the need to understand effect of predicted future temperature and nutrient scenarios on marine phytoplankton. However, experimental studies addressing effects both drivers use a variety design approaches regarding their rate supply regimes. This study combines systematic literature map identify existing bias in evaluating phytoplankton response change, with laboratory experiment. The experiment was designed quantify how different levels (6°C, 12°C, 18°C), regimes (abrupt vs. gradual increase), timings addition (before or after change) (limiting balanced) alter growth stoichiometry natural community. revealed three key biases global experiments: (1) 66% do not explicitly describe regime, (2) 84% applied an abrupt exposure, (3) only 15% experimentally manipulated regime. Our demonstrated that identified toward exposure induced short‐term overshoot compared gradually increasing temperatures. Additionally, timing availability strongly modulated direction strength enhancement along balanced N : P ratios. stresses ratio should be considered planning produce ecologically relevant results as setups lead contrasting directions outcome.

Language: Английский

Citations

3
Different temperature sensitivities of key physiological processes lead to divergent trait response patterns in Arctic phytoplankton DOI Creative Commons
Linda Rehder, Sebastian Rokitta, Clara J. M. Hoppe

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(8), P. 1845 - 1856

Published: July 19, 2024

Abstract Ocean warming is especially pronounced in the Arctic, and phytoplankton will face thermodynamically driven changes their physiology, potentially pushing them beyond thermal optimum. We assessed temperature responses of multiple functional traits over entire window (growth rates, quotas particulate organic carbon, nitrogen, chlorophyll a , as well photophysiological parameters) three different Arctic species ( Thalassiosira hyalina Micromonas pusilla Nitzschia frigida ). Temperature response patterns growth biomass production rates indicated that all exhibit wide windows with highest at temperatures exceed current polar temperatures. Species showed cellular elemental quotas, which originate from interplay cell division production: These processes differ sensitivity optima, resulting U‐shaped, bell‐shaped, or linear quotas. Despite unaltered light intensity, higher increased acclimation indices while lifetimes photosystem II reopening decreased species, suggesting causes transition saturation to limitation. Our findings on sensitivities not only indicate may benefit moderate warming, but also highlight meaningful interpretations require consideration underlying processes.

Language: Английский

Citations

2
A Phaeocystis bloom in the northern Beibu Gulf reflects nutrient-driven shifts in dominant phytoplankton taxa DOI
Zheng‐Xi Zhou, Rencheng Yu,

Zhenjun Kang

et al.

Environmental Pollution, Journal Year: 2024, Volume and Issue: unknown, P. 125422 - 125422

Published: Nov. 1, 2024

Language: Английский

Citations

1
Dynamics of a Phaeocystis Bloom in the Northern Beibu Gulf Highlights the Shift of Dominant Phytoplankton Taxa in Winter Driven by Nutrients DOI
Zheng‐Xi Zhou, Rencheng Yu,

Zhenjun Kang

et al.

Published: Jan. 1, 2024

Language: Английский

Citations

0
Moderate and extreme warming under a varied resource supply alter the microzooplankton–phytoplankton coupling in North Sea coastal communities DOI Creative Commons
Marco J. Cabrerizo, Anika Happe, Antonia Ahme

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Abstract Rising temperature is one of the most visible effects global change on Earth; however, it barely known how moderate or extreme warming events impact trophic interactions and energy transfer in food webs. Combining a mesocosm approach two‐point dilution incubations, we quantified natural plankton assemblages respond to (+6°C vs. +12°C above ambient temperature), covering nitrogen‐to‐phosphorus gradient from nutrient‐saturated limited conditions. We addressed both drivers altered community structure mediated phytoplankton growth ( μ ) microzooplankton grazing m rates. Moderate microzooplankton–phytoplankton relationship differed were by time. This interaction was weakened due outpacing regardless treatment at middle experiment. By contrast, after acclimation period, strengthened increased under warming. The variable pressure found different temporal scales only could be decreased with increasing when prey biomass low, vice versa. Also, consequence switch toward mixotrophy that temperatures experienced grazers suboptimal compared their prey. Finally, main driver whereas resource availability played minor role this interaction. As climate will intensify future, webs less productive but more efficient, thus, potentially support higher secondary production.

Language: Английский

Citations

0