Climate warming in winter affects the coupling between phytoplankton and bacteria during the spring bloom: a mesocosm study

Höppe, Henning A.; Breithaupt, Petra; Walther, Katja; Koppe, Regine; Bleck, Stephan; Sommer, Ulrich; Jürgens, Klaus

doi:10.3354/ame01198

Cited by 98 publications

(99 citation statements)

References 39 publications

(34 reference statements)

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“…at 5.0°C in the Arctic, and at 2.5, 5.0 and 7.0°C in the Fjord microcosm are in agreement with observations made by Lovejoy et al (2007) in the Arctic Ocean, where there are blooms of this picoflagellate during spring and summer. In the present study, BA (bacterial abundance) and BP (bacterial production) increased when chl a concentration decreased, probably due to the increase in organic matter from excretion or cell lysis of primary producers that might stimulate bacterial growth, as proposed by Hoppe et al (2008). Moreover, empirical relationships between temperature and bacterial growth in natural bacterioplankton assemblages have shown that temperature is closely related to BP (White et al 1991, Wiebe et al 1992, Shiah & Ducklow 1994.…”

Section: Phytoplankton and Bacterioplanktonmentioning

confidence: 62%

Experimental evaluation of the warming effect on viral, bacterial and protistan communities in two contrasting Arctic systems

Lara

Arrieta²,

García-Zarandona³

et al. 2013

Aquat. Microb. Ecol.

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The effect of Arctic warming, which is 3 times faster than the global average, on microbial communities was evaluated experimentally to determine how increasing temperatures affect bacterial and viral abundance and production, protist community composition, and bacterial loss rates (bacterivory and lysis) in 2 contrasting Arctic marine systems. In July 2009, we collected samples from open Arctic waters in the Barents Sea and Atlantic-influenced waters in Isfjorden, Svalbard Islands (Fjord waters). The samples were used in 2 microcosm experiments at 7 temperatures, ranging from 1.0 to 10.0°C. In the open Arctic microbial community, collected at <1.0°C, bacterial and viral abundances, bacterial production and grazing rates due to protists increased significantly above 5.5°C, and remained at high values at even higher experimental temperatures. The abundance of protists, such as some heterotrophic pico/nanoflagellates, as well as some ciliates, also increased with warming. In contrast, the biomass of phototrophs decreased above 5.5°C. The water temperature in Fjord waters was 6.2°C at the time of sampling, and the microbial community showed smaller variations than the Arctic community. These results indicate that increases in temperature stimulate heterotrophic microbial biomass and activity compared to that of phototrophs, which has important implications for carbon and nutrient cycling in the system. In addition, open Arctic communities were more vulnerable to warming than those already adapted to the warmer Fjord waters influenced by Atlantic seawater.

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Section: Phytoplankton and Bacterioplanktonmentioning

confidence: 62%

Experimental evaluation of the warming effect on viral, bacterial and protistan communities in two contrasting Arctic systems

Lara

Arrieta²,

García-Zarandona³

et al. 2013

Aquat. Microb. Ecol.

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“…Two main approaches have been followed: (1) experimental approaches designed as factorial experiments, incubating macroalgae for days or months at different growth temperatures according to the future predicted scenarios, and evaluating the interactive responses with other variables, such as acidification, UV radiation (UVR), and nutrient availability, amongst others (Baulch et al 2003, Hoppe et al 2008, Porzio et al 2011and (2) field studies of seaweeds growing at their temperature limit for growth and reproduction, while monitoring the temporal and spatial variation of temperature and other variables (Viejo et al 2011, Martínez et al 2012. Most investigations have been conducted on individual species separately, rather than communities (Olabarria et al 2013), although it has been reported that community-level impacts might be less noticeable (Kroeker et al 2010).…”

Section: )mentioning

confidence: 99%

Short-term effects of increasing CO2, nitrate and temperature on three Mediterranean macroalgae: biochemical composition

Figueroa¹,

Barufi²,

Malta³

et al. 2014

Aquat. Biol.

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“…PPr can also show a positive response to temperature, although this has not been as well documented as for bacteria (Vrede et al 1999). The response to temperature may, thus, be greater for BP than PPr; therefore, increasing temperatures may increase the BP : PPr ratio (Mü ren et al 2005;Hoppe et al 2008). Physical attributes of lake ecosystems such as mean depth and lake area may also affect PPr and BP, i.e., large, shallow lakes tend to have higher sediment resuspension and P release from sediments than deep lakes (Kalff 2003).…”

mentioning

confidence: 99%

Effects of nutrients and physical lake characteristics on bacterial and phytoplankton production: A meta‐analysis

Faithfull

Bergström

Vrede

2011

Limnology & Oceanography

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We performed a meta-analysis comprising field (300 studies) and experimental data (249 studies) from a wide range of lake trophic states and locations. We examined the effects of nitrogen (N), phosphorus (P), carbon (dissolved organic matter [DOM]), temperature, latitude, and lake morphometry on the absolute and relative rates of phytoplankton primary production (PPr) and secondary bacterial production (BP). Areal and volumetric rates of PPr, BP, and BP : PPr were compared, and we analyzed differences between experimental and natural systems. Both field studies and experimental results showed agreement with regard to N and P as predictors of volumetric PPr and BP, respectively, despite the large variation in study duration, size, and nutrient addition rates in experimental systems. This indicates that bacteria and phytoplankton do not seem to be competing for the same nutrients. Areal measurements were more difficult to predict and were more dependent on physical lake characteristics than nutrients. Temperature was positively correlated with PPr, but not with BP. BP : PPr was stable across experiments regardless of N, P, DOM, or glucose additions. In contrast, BP : PPr ratios varied greatly in the field data set and were highest in systems with low total N and at high latitudes. This pattern was driven by reduced PPr, not BP; therefore, experimenters may need to manipulate PPr to change BP : PPr. Collectively, our results indicate that increased temperatures and N availability will lead to higher PPr and lower BP : PPr, potentially decreasing the importance of energy mobilized through the microbial food web on a global scale.

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Climate warming in winter affects the coupling between phytoplankton and bacteria during the spring bloom: a mesocosm study

Abstract: An indoor mesocosm used to determine the effect of warming on microbial communities. Inset: Recycling of organic matter inside the mesocosm is mediated by the interaction of phytoplankton and bacteria.

Cited by 98 publications

References 39 publications

Experimental evaluation of the warming effect on viral, bacterial and protistan communities in two contrasting Arctic systems

Experimental evaluation of the warming effect on viral, bacterial and protistan communities in two contrasting Arctic systems

Short-term effects of increasing CO2, nitrate and temperature on three Mediterranean macroalgae: biochemical composition

Effects of nutrients and physical lake characteristics on bacterial and phytoplankton production: A meta‐analysis

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