Uncoupled phytoplankton-bacterioplankton relationship by multiple drivers interacting at different temporal scales in a high-mountain Mediterranean lake

Durán-Romero, Cristina; Medina‐Sánchez, Juan Manuel; Carrillo, Presentación

doi:10.1038/s41598-019-57269-y

Cited by 10 publications

(7 citation statements)

References 66 publications

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“…In these particular conditions, mod- erate additions of inorganic nutrients or warming can boost productivity, diversity and ecosystem functioning (Coveney & Wetzel, 1992;Häder et al, 2014;Woodward et al, 2012). However, the final outcome of nutrient or thermal changes on freshwater ecosystems strongly depends on their magnitude, duration and direction (Barton et al, 2020;Durán-Romero et al, 2020;Padfield et al, 2016). Previous studies have shown that nutrients seem to have overall negative effects only at high concentrations (Birk et al, 2020;Nõges et al, 2016;Woodward et al, 2012), although aspects such as productivity can be still high at eutrophic conditions (Arroita et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Intensifying the research on lentic systems. Lentic systems were less represented in Iberian multiple-stressor studies and were focused on a limited number of stressors (nutrient enrichment, UVR and thermal stress) (Cabrerizo et al, 2017;Carrillo et al, 2008;Durán-Romero et al, 2020). Therefore, we urge to investigate more lentic systems and pairwise combinations, including other typical stressors such as biological invasions (Gallardo et al, 2016), toxicants (Hijosa-Valsero et al, 2016) or hydrologic stress (Álvarez-Cobelas et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

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Multiple-stressors effects on Iberian freshwaters: A review of current knowledge and future research priorities

Gutiérrez‐Cánovas¹,

Arias-Real²,

Bruno³

et al. 2022

Limnetica

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Freshwater ecosystems are exposed to an increasing number of stressors, challenging their biomonitoring and management. Despite recent advances in multiple-stressor research, regional-scale assessments in areas with high freshwater biodiversity and increasing anthropogenic pressure are urgently needed. We reviewed 61 studies focused on freshwater individuals, populations and communities from the Iberian Peninsula to (i) quantify the frequency of experimental approaches used (manipulative, observational), aquatic systems, biological organization levels, and types of organisms and modelled responses, (ii) identify key individual stressors and the frequency of significant positive (increase in response magnitude) and negative (decrease) effects and (iii) determine types of interacting stressors and the frequency of their combined effects. Our dataset comprised 409 unique responses to 13 types of individual stressors, 34 stressor pairs and 12 high-order interactions (3- and 4-way). We found a higher prevalence of manipulative (85 %) respect to observational studies, and a greater focus on lotic systems (59 %) and heterotrophic organisms (58 %). The most studied stressors were nutrient (Nutr), thermal (Therm), hydrologic (Hydr), ultraviolet radiation (UVR), toxic (Toxic) and salinity (Sal) stress and land-use pressure. Individual stressors showed a higher proportion of negative (34 %) than positive effects (26 %). Nutr × UVR, Toxic × Toxic, Therm × Toxic, Hydr × Toxic, Sal × Therm, and Nutr × Therm were the most studied stressor pairs. Non-interactive (50 %) and interactive responses (50 %) were balanced. Antagonistic effects (18 %) were slightly more common than synergisms (15 %), reversal or opposing (13 %) and high-order interactions (4 %). Such proportions varied within experimental approaches, biological organization levels and organism types. Our findings are helpful to manage certain stressor combinations in Iberian freshwaters. Further efforts in Iberian multiple-stressor research should be directed to (i) intensify the study of lentic systems, (ii) explore more observational data, (iii) autotrophic organisms and (vi) biodiversity-ecosystem functioning responses, and (v) cover a wider range of stressors and (vi) more complex interacting stressor scenarios.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Multiple-stressors effects on Iberian freshwaters: A review of current knowledge and future research priorities

Gutiérrez‐Cánovas¹,

Arias-Real²,

Bruno³

et al. 2022

Limnetica

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“…For example, we showed that glucose consumption was higher at 18°C than at 10°C, and that prokaryote biomass increased more at 18°C. Interactive effect of temperature increase with resource availability and with ultraviolet exposition have been experimentally demonstrated on freshwater bacterioplankton and on phytoplankton–bacterioplankton relationships (Hall and Cotner 2007; Durán‐Romero et al 2020). The later showed that the resource utilization by bacteria was higher at higher temperature.…”

Section: Discussionmentioning

confidence: 99%

Summer dynamics drive the microbial response to carbon and nutrient additions in a high‐altitude lake

Dory

Cavalli

Franquet

et al. 2022

Limnology & Oceanography

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The predicted increase in allochthonous dissolved organic carbon (DOC) in high‐altitude lakes is expected to alter the phytoplankton–bacterioplankton relationship. However, few studies address the influence of summer phytoplankton dynamics on microbial responses to DOC additions. We sampled natural plankton assemblages during two contrasting periods of summer in a high‐altitude lake in the French Alps and subjected them to glucose and nutrient enrichments under two light conditions (dark or light) and two temperature conditions (10°C or 18°C). Our results indicate that glucose use by bacteria differs over the summer, depending on the availability of autochthonous DOC and the nutrient limitation. Glucose was consumed by bacteria more in early summer; however, biomass increased with glucose addition more in late summer than in early summer. This pattern arose from the greater availability of phytoplankton‐derived DOC in late summer, reducing the need for alternative carbon sources in late summer, when phytoplankton biomass was high. Mixotrophic taxa were stimulated after glucose additions both in early summer and in late summer. We found greater competition between bacteria and phytoplankton in late summer after glucose addition, linked to the summer nutrient limitation pattern. Our study thus highlights a differential response depending on the timing of summer DOC inputs. The global changes forecast for the French Alps should increase heterotrophic and mixotrophic processes in planktonic communities of shallow high‐altitude lakes with vegetated catchments. This experimental study provides insights that will be useful in predicting ecological trajectories and in refining predictions of sentinel lakes' responses to global changes.

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“…Lakes from Sierra Nevada National Park are mixed, oligotrophic high-mountain lakes located above the tree line on a siliceous bedrock in a glacial cirque 41 , whereas lakes in Lagunas de Ruidera Natural Park are mixed, oligotrophic ecosystems with high nitrate concentrations from land use, located on calcareous www.nature.com/scientificreports/ substrates 42 . Phytoplankton communities from these lakes have been the focus of recent studies aiming to determine the single effects of solar UVR, or their interaction in 2-level combinations, such as nutrient inputs 14,[42][43][44] , vertical mixing or stratification 18,45 and/or increased temperatures 46,47 on PP.…”

Section: Experimental Studymentioning

confidence: 99%

Multiple interacting environmental drivers reduce the impact of solar UVR on primary productivity in Mediterranean lakes

Cabrerizo

Helbling

Villafañe

et al. 2020

Sci Rep

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Increases in rainfall, continental runoff, and atmospheric dust deposition are reducing water transparency in lakes worldwide (i.e. higher attenuation Kd). Also, ongoing alterations in multiple environmental drivers due to global change are unpredictably impacting phytoplankton responses and lakes functioning. Although both issues demand urgent research, it remains untested how the interplay between Kd and multiple interacting drivers affect primary productivity (Pc). We manipulated four environmental drivers in an in situ experiment—quality of solar ultraviolet radiation (UVR), nutrient concentration (Nut), CO2 partial pressure (CO2), and light regime (Mix)—to determine how the Pc of nine freshwater phytoplankton communities, found along a Kd gradient in Mediterranean ecosystems, changed as the number of interacting drivers increased. Our findings indicated that UVR was the dominant driver, its effect being between 3–60 times stronger, on average, than that of any other driver tested. Also, UVR had the largest difference in driver magnitude of all the treatments tested. A future UVR × CO2 × Mix × Nut scenario exerted a more inhibitory effect on Pc as the water column became darker. However, the magnitude of this synergistic effect was 40–60% lower than that exerted by double and triple interactions and by UVR acting independently. These results illustrate that although future global-change conditions could reduce Pc in Mediterranean lakes, multiple interacting drivers can temper the impact of a severely detrimental driver (i.e. UVR), particularly as the water column darkens.

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Uncoupled phytoplankton-bacterioplankton relationship by multiple drivers interacting at different temporal scales in a high-mountain Mediterranean lake

Cited by 10 publications

References 66 publications

Multiple-stressors effects on Iberian freshwaters: A review of current knowledge and future research priorities

Multiple-stressors effects on Iberian freshwaters: A review of current knowledge and future research priorities

Summer dynamics drive the microbial response to carbon and nutrient additions in a high‐altitude lake

Multiple interacting environmental drivers reduce the impact of solar UVR on primary productivity in Mediterranean lakes

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