The effects of temperature increases on a temperate phytoplankton community — A mesocosm climate change scenario

Lassen, Majbritt Kjeldahl; Nielsen, Kathryn Dewar; Richardson, Katherine; Garde, Kristine; Schlüter, Louise

doi:10.1016/j.jembe.2009.10.014

Cited by 45 publications

(32 citation statements)

References 30 publications

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“…Both investigations indicate that large cells (especially diatoms, which constituted most of the phytoplankton biomass) are favored by the increase in temperature (with or without additional UV-B), while small cells are negatively affected (Table 4a). Variable responses to temperature have been reported in previous work; while Halac et al (2010) and Lassen et al (2010) (2010) show a negative effect of warming on large cells (particularly diatoms) possibly related to an increased respiratory demand. The characteristics of our experiment (short duration, which is appropriate for the duration of blooms in temperate environments, and mid-range temperature) are more similar to those of Lassen et al (2010), since Wohlers et al (2009) followed a community over 1 mo at temperatures less than 8°C.…”

Section: Discussionsupporting

confidence: 52%

“…Variable responses to temperature have been reported in previous work; while Halac et al (2010) and Lassen et al (2010) (2010) show a negative effect of warming on large cells (particularly diatoms) possibly related to an increased respiratory demand. The characteristics of our experiment (short duration, which is appropriate for the duration of blooms in temperate environments, and mid-range temperature) are more similar to those of Lassen et al (2010), since Wohlers et al (2009) followed a community over 1 mo at temperatures less than 8°C. The variability in response to light (or UV radiation, van Donk et al 2001) and temperature is surely affected by the composition of the phytoplankton community and probably also by acclimation processes (Villafañe et al 1995).…”

Section: Discussionsupporting

confidence: 52%

“…Some of these have reported a decrease in phytoplankton biomass (notably diatoms) and a shift towards smaller cell sizes associated with warming (e.g. Lewan dows ka & Sommer 2010), although others find beneficial effects of increased temperature on diatoms or dino flagellates (Halac et al 2010, Lassen et al 2010). …”

Section: Introductionmentioning

confidence: 99%

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Combined effects of increased UV-B and temperature on the pigment-determined marine phytoplankton community of the St. Lawrence Estuary

Lionard¹,

Roy²,

Tremblay-Létourneau³

et al. 2012

Mar. Ecol. Prog. Ser.

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The combined effects of increased UV-B and temperature on natural marine phytoplankton from the St. Lawrence Estuary (Canada) were examined in an 8 d mesocosm experiment carried out in Rimouski (Québec, Canada) in August 2008. We tested the hypothesis that increased temperature (+ 3°C) will offset algal growth suppression by UV-B (78% UV-B increase) using duplicate mesocosm experiments containing natural phytoplankton assemblages. The response of the entire phytoplankton community, in terms of HPLC pigment-based phytoplankton bio mass, community composition (CHEMTAX), xanthophyll cycles photoprotection and quantum yield of photosystem II (the ratio of variable to maximum fluorescence: F v /F m ), showed a significant influence of temperature (negative on small phytoplanktonic cells, < 5 µm, and positive on larger diatoms) but only after the peak of the diatom bloom, when nutrients became limited. Interactions between temperature and UV-B treatments were significant only for small cells during post-bloom; UV-B induced an increase in phytoplankton biomass at the normal temperature but had no effect at warmer temperatures. Enhancing UV-B delayed the bloom slightly under the normal temperature and spread it over a longer period of time, with no sign of major cellular damage. Our re sults do not support the tested hypothesis, and they suggest that temperature plays a greater role than UV-B radiation in structuring phytoplankton communities, possibly favouring diatoms rather than small cells in a warmer climate scenario. Other effects such as grazing or coastal eutrophication should be considered in future studies.

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Section: Discussionsupporting

confidence: 52%

Section: Discussionsupporting

confidence: 52%

See 1 more Smart Citation

Combined effects of increased UV-B and temperature on the pigment-determined marine phytoplankton community of the St. Lawrence Estuary

Lionard¹,

Roy²,

Tremblay-Létourneau³

et al. 2012

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…This result is in line with those of Sommer & Lewandowska (2011), who also found phytoplankton (carbon) bio mass to decrease with warming and higher copepod density. Other mesocosm experiments have also detected negative ef fects of elevated temperature on phytoplankton biomass (Keller et al 1999, O'Connor et al 2009, Lassen et al 2010, Lewandowska & Sommer 2010) and a general reduction in phyto plankton cell size (Lewan dow s ka & Sommer 2010). Although, re du ced phytoplankton (carbon) biomass and POC accumulation in ses ton at higher copepod density and temperature point to an enhancement in copepod grazing pressure, PN and POP were not affected by copepod grazing or temperature in this study.…”

Section: Bloom Timing and Changes In The Pom Poolmentioning

confidence: 95%

“…Some studies have detected negative effects of rising temperature on phytoplankton biomass (Keller et al 1999, O'Connor et al 2009, Lassen et al 2010, Lewandowska & Sommer 2010 or, as a consequence of an enhancement in ocean stratification, on primary production (Behrenfeld et al 2006). Some of these studies related the negative effect of warming on phytoplankton biomass to increased abundances of zooplankton (Keller et al 1999, O'Connor et al 2009 or enhanced grazing pressure (Lewandowska & Sommer 2010).…”

Section: Introductionmentioning

confidence: 99%

Organic matter partitioning and stoichiometry in response to rising water temperature and copepod grazing

Biermann¹,

Lewandowska²,

Engel³

et al. 2015

Mar. Ecol. Prog. Ser.

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Rising ocean temperature is expected to change the balance between production and degradation of organic matter due to different temperature sensitivities of auto-and heterotrophic processes. Copepods are the most prominent zooplankton group, and elevated temperature increases their growth and grazing rates. So far, it is unknown to what extent copepods affect the partitioning and stoichiometry of organic matter in a warmer surface ocean. We therefore conducted a mesocosm experiment with 3 copepod densities and 2 temperature scenarios to determine effects on the pools of dissolved and particulate organic matter and their C:N:P ratios. Here we show that particulate organic C (POC) concentrations decreased with increasing copepod abundance. This effect was more pronounced at elevated temperature, yielding a decrease in the POC to particulate nitrogen ratio (POC:PN) from 26 to 13 and in the POC:particulate organic phosphorus (POP) ratio from 567 to 257, from low to high copepod density. Dissolved organic carbon (DOC) accumulation was positively affected by temperature. However, increasing copepod abundance decreased the accumulation of DOC at elevated temperature. Copepod grazing and egestion enhanced the recycling of N and P, thereby increasing the availability of these nutrients for autotrophs. In concert with temperature-induced shifts in the phytoplankton community composition and size, changes in copepod abundance may therefore have contributed to altering the elemental composition of seston. Our findings suggest combined effects of zooplankton grazing and temperature on the composition and recycling of organic matter that should be taken into account when simulating biogeochemical cycles in a future ocean.

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Carbon, Nitrogen, and Sulfur Contents in Marine Phytoplankton Cells and Biomass Conversion

Chen

Yang

Shang

et al. 2023

J. Ocean Univ. China

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The effects of temperature increases on a temperate phytoplankton community — A mesocosm climate change scenario

Cited by 45 publications

References 30 publications

Combined effects of increased UV-B and temperature on the pigment-determined marine phytoplankton community of the St. Lawrence Estuary

Combined effects of increased UV-B and temperature on the pigment-determined marine phytoplankton community of the St. Lawrence Estuary

Organic matter partitioning and stoichiometry in response to rising water temperature and copepod grazing

Carbon, Nitrogen, and Sulfur Contents in Marine Phytoplankton Cells and Biomass Conversion

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