Evidence of warming effects on phytoplankton productivity rates and their dependence on eutrophication status

Tadonléké, Rémy D.

doi:10.4319/lo.2010.55.3.0973

Cited by 67 publications

(49 citation statements)

References 28 publications

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“…By that time, the winter overturn of the water column was weaker in response to warmer winters (Jacquet et al 2005). Furthermore, the increase of the summer temperature stimulates primary production (Tadonléké 2010), whereas the longer stratification promotes the appearance of large, filamentous phytoplankton in Lake Bourget (Jacquet et al 2005). Biologically mediated consequences of climate warming hence also contribute to increase OM fluxes to the sediment and, in turn, respiration.…”

Section: Discussionmentioning

confidence: 99%

A spatiotemporal investigation of varved sediments highlights the dynamics of hypolimnetic hypoxia in a large hard‐water lake over the last 150 years

Jenny

Arnaud

Dorioz

et al. 2013

Limnology & Oceanography

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The spatiotemporal distribution of biochemical varves spanning the last 150 yr was investigated using 40 cores collected over a depth gradient in a large subalpine lake-Lake Bourget-in the French Alps. Four-dimensional sedimentological, biological, and geochemical analyses show that varve preservation can be used as a reliable proxy to reconstruct annual-to-decadal oscillations of hypoxia in large lakes. The volume of hypoxic waters was calculated by integrating the volume between the lake bottom and the depth of the shallowest varve-bearing core for each year. Although Lake Bourget bottom waters have been oxic over the last 9000 yr, severe hypoxia has occurred only since 1933 6 1. The volume of hypoxic waters showed, thereafter, a succession of pronounced fluctuations, leading to an increase of 8% of the total lake volume in the 1960s, a decline in the 1980s, and a second, ongoing increase since 1990. Whereas the initial onset of persistent hypoxic conditions could be attributed to eutrophication due to nutrient-rich inputs from sewage water and/or diffuse contamination, the later fluctuations were also driven by climatic factors, i.e., flooding, rising air temperatures, and phosphorus-independent changes in primary production. Hence, cumulative effects related to global warming seem to have driven hypolimnetic hypoxic conditions since equilibrium was initially disrupted due to a drastic shift in the trophic state.In both marine and freshwater ecosystems, hypoxia In many marine and freshwater ecosystems, humaninduced eutrophication, as a result of nutrient-mainly N and P-over-enrichment of waters, has caused bottomwater hypoxia (Carpenter 2005;Diaz and Rosenberg 2008). It seems logical, therefore, that nutrient abatement measures would result in a return to oxic conditions in bottom waters. However, recent research has shown that climatic changes can also trigger deoxygenation of deep habitats (Deutsch et al. 2011). Climate warming alters the water temperature and water-mass stability, which can affect bottom oxygen conditions by decreasing dioxygen In Lake Bourget, most symptoms of eutrophication (the increase in N : P ratio, the increase in water column transparency in spring, and the reduction in chlorophyll a concentrations) disappeared within the last 30 yr in response to a drastic drop in dissolved P content in water (Jacquet et al. 2005) following a restoration program that started in the 1980s. Counterintuitively, severe hypoxic conditions (defined here as the prolonged absence of bioavailable O 2 in the hypolimnion, leading to a drastic reduction of benthic fauna) still prevail in bottom waters, precluding a return to pre-industrial ecosystem conditions ). Our objective is to reconstruct the yearly intensity of hypolimnetic hypoxia over the last 150 yr in Lake Bourget and to qualitatively explore potential forcing factors related to nutrient concentration and climate.Because long-term monitoring data are scarce or missing and almost never cover the pre-industrial period, long-term

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Section: Discussionmentioning

confidence: 99%

A spatiotemporal investigation of varved sediments highlights the dynamics of hypolimnetic hypoxia in a large hard‐water lake over the last 150 years

Jenny

Arnaud

Dorioz

et al. 2013

Limnology & Oceanography

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“…Similar to the GDD model, there was a positive relationship between chlorophyll a values and mean length of age-0 walleye. Both the GDD metric and chlorophyll a could be an index of lake productivity and phytoplankton biomass, as increased phytoplankton biomass has been associated with warming temperatures under eutrophic conditions (Tadonleke, 2010). Increased growth rates of age-0 walleye associated with increased chlorophyll a concentrations could also be a result of bottom-up trophic interactions as increases in productivity at the bottom of the food chain could resonate up through the food chain and generate greater prey availability to age-0 walleye (McQueen et al, 1986).…”

Section: Discussionmentioning

confidence: 99%

Degree-day accumulation influences annual variability in growth of age-0 walleye

et al. 2013

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a b s t r a c tThe growth of age-0 fishes influences survival, especially in temperate regions where size-dependent over-winter mortality can be substantial. Additional benefits of earlier maturation and greater fecundity may exist for faster growing individuals. This study correlated prey densities, growing-degree days, water-surface elevation, turbidity, and chlorophyll a with age-0 walleye Sander vitreus growth in a southcentral Nebraska irrigation reservoir. Growth of age-0 walleye was variable between 2003 and 2011, with mean lengths ranging from 128 to 231 mm by fall (September 30th-October 15th). A set of a priori candidate models were used to assess the relative support of explanatory variables using Akaike's information criterion (AIC). A temperature model using the growing degree-days metric was the best supported model, describing 65% of the variability in annual mean lengths of age-0 walleye. The second and third best supported models included the variables chlorophyll a (r 2 = 0.49) and larval freshwater drum density (r 2 = 0.45), respectively. There have been mixed results concerning the importance of temperature effects on growth of age-0 walleye. This study supports the hypothesis that temperature is the most important predictor of age-0 walleye growth near the southwestern limits of its natural range.

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“…In general, the response to water temperature was positive in primary production and negative in respiration, but this response depended of the nutrient availability, since the metabolic processes is dependent on many factors (Tadonléke, 2010). Tonetta et al (2013) have also demonstrated that changes in water temperature and nutrient availability drive temporal variation in phytoplankton in Peri Lake.…”

Section: Temporal Variationmentioning

confidence: 99%

“…Phytoplankton productivity is sensitive to nutrient, especially phosphorus availability (Tadonléke, 2010;Kerimoglu et al, 2013). Phosphorus enrichment and light availability sustain the pelagic chlorophyll a and primary production, while in oligotrophic lakes phytoplanktonic growth and production are frequently constrained by nutrient limitation (Carpenter et al, 2001;Liboriussen and Jeppesen, 2003).…”

Section: Introductionmentioning

confidence: 99%

Planktonic production and respiration in a subtropical lake dominated by Cyanobacteria

2015

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Planktonic primary production and respiration rates were estimated in a subtropical coastal lake dominated by Cyanobacteria in order to investigate the temporal and vertical variation in this lake and to evaluate its relationships with limnological variables and phytoplankton. Light and dark bottles were incubated at four different depths in the central part of the lake and were performed bimonthly from June/2009 to December/2010. No significant difference was evident among depths in relation to phytoplankton, limnological variables and metabolic rates. However, the highest production rates were recorded at the surface, and decreased towards the bottom, coupled with phytoplanktonic photosynthetic capacity. Wind induced mixing in Peri Lake played an important role in nutrient and phytoplankton redistribution, characterizing this lake as polymictic. According to density and biovolume, the phytoplankton community was dominated by filamentous Cyanobacteria, especially Cylindrospermopsis raciborskii (Woloszynska) Seenayya and Subba-Raju. This study has shown that both water temperature and nutrient availability drive phytoplankton growth and consequently the temporal variation in metabolic rates, where respiration is higher than primary production.Keywords: subtropical coastal lake, primary production, respiration, phytoplankton, Cylindrospermopsis raciborskii.Produção e respiração planctônicas em uma lagoa subtropical dominada por cianobactérias ResumoAs taxas de produção primária e respiração planctônicas foram estimadas em um lago costeiro subtropical dominado por cianobactérias, com o objetivo de investigar a variação temporal e vertical nesta lagoa e avaliar suas relações com as variáveis limnológicas e os grupos fitoplanctônicos. Garrafas claras e escuras foram incubadas em quatro diferentes profundidades na parte central da lagoa e foram realizadas bimensalmente de junho/2009 a dezembro/2010. Nenhuma diferença significativa foi encontrada entre as profundidades amostradas, em relação ao fitoplâncton, variáveis limnológicas e taxas metabólicas. No entanto, as maiores taxas de produção foram registradas na superfície, diminuindo com o aumento da profundidade, juntamente com a capacidade fotossintética do fitoplâncton. A ação do vento na lagoa do Peri promoveu a homogeneidade de nutrientes e do fitoplâncton na coluna d'água, caracterizando-o como polimítico. De acordo com a densidade e biovolume, a comunidade fitoplanctônica foi dominada por cianobactérias filamentosas, especialmente Cylindrospermopsis raciborskii (Woloszynska) Seenayya and Subba-Raju. Este estudo demonstrou que a temperatura da água combinada com a disponibilidade de nutrientes influencia a comunidade fitoplanctônica, determinando a variação temporal das taxas metabólicas, onde a respiração é maior que a produção primária.Palavras-chave: lagoa costeira subtropical, produção primária, respiração, fitoplâncton, Cylindrospermopsis raciborskii.

show abstract

Evidence of warming effects on phytoplankton productivity rates and their dependence on eutrophication status

Cited by 67 publications

References 28 publications

A spatiotemporal investigation of varved sediments highlights the dynamics of hypolimnetic hypoxia in a large hard‐water lake over the last 150 years

A spatiotemporal investigation of varved sediments highlights the dynamics of hypolimnetic hypoxia in a large hard‐water lake over the last 150 years

Degree-day accumulation influences annual variability in growth of age-0 walleye

Planktonic production and respiration in a subtropical lake dominated by Cyanobacteria

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