Midsummer heat wave effects on lacustrine plankton: Variation of assemblage structure and fatty acid composition

Maazouzi, Chafik; Masson, G.; Izquierdo, M.S.; Pihan, Jean-Claude

doi:10.1016/j.jtherbio.2008.03.002

Cited by 40 publications

(37 citation statements)

References 57 publications

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“…The question arises: if we used other size classes or sampled zooplankton with different species composition would it substantially affect the general conclusions? Some authors during studies of FA composition of seston and zooplankton used more than two fractions (Maazouzi et al 2008;Kainz et al 2009). However, Maazouzi et al (2008) found no significant differences in FA contents between the two smallest plankton size fractions, 50-100 and 100-200 lm, nor between the two largest ones, 200-500 and [500 lm.…”

Section: Maymentioning

confidence: 99%

Efficiency of transfer of essential polyunsaturated fatty acids versus organic carbon from producers to consumers in a eutrophic reservoir

et al. 2010

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One of the central paradigms of ecology is that only about 10% of organic carbon production of one trophic level is incorporated into new biomass of organisms of the next trophic level. Many of energy-yielding compounds of carbon are designated as 'essential', because they cannot be synthesized de novo by consumers and must be obtained with food, while they play important structural and regulatory functions. The question arises: are the essential compounds transferred through trophic chains with the same efficiency as bulk carbon? To answer this question, we measured gross primary production of phytoplankton and secondary production of zooplankton and content of organic carbon and essential polyunsaturated fatty acids of ω-3 family with 18-22 carbon atoms (PUFA) in the biomass of phytoplankton and zooplankton in a small eutrophic reservoir during two summers. Transfer efficiency between the two trophic levels, phytoplankton (producers) and zooplankton (consumers), was calculated as ratio of the primary production versus the secondary (zooplankton) production for both carbon and PUFA. We found that the essential PUFA were transferred from the producers to the primary consumers with about twice higher efficiency than bulk carbon. In contrast, polyunsaturated fatty acids with 16 carbon atoms, which are synthesized exclusively by phytoplankton, but are not essential for animals, had significantly lower transfer efficiency than both bulk carbon, and essential PUFA. Thus, the trophic pyramid concept, which implicitly implies that all the energy-yielding compounds of carbon are transferred from one trophic level to the next with the same efficiency of about on average 10%, should be specified for different carbon compounds.

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Section: Maymentioning

confidence: 99%

Efficiency of transfer of essential polyunsaturated fatty acids versus organic carbon from producers to consumers in a eutrophic reservoir

et al. 2010

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“…Zooplankton play significant roles in linking primary producers and higher trophic levels in aquatic ecosystems (Yan et al, 2007;Maazouzi et al, 2008;Medeiros and Arthington, 2008). Thus it is important to assess the impact of performing environmental protection or restoration technology on zooplankton.…”

Section: Discussionmentioning

confidence: 99%

“…As crucial components of the aquatic food chain, the qualitative and quantitative changes in zooplankton population might bring a consequential impact on the whole aquatic ecosystem (Bianchi et al, 2003;Basima et al, 2006;Maazouzi et al, 2008;Medeiros and Arthington, 2008). Thus, the impact assessment of zooplankton community is important during conducting the environmental protection planning or restoration projects.…”

Section: Introductionmentioning

confidence: 99%

Impacts of algal blooms removal by chitosan-modified soils on zooplankton community in Taihu Lake, China

Feng

et al. 2010

Journal of Environmental Sciences

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“…La réduction ré-cente mais marquée des herbiers pourrait aggraver les conditions de reproduction du poisson, puis de dé-veloppement de leur progéniture. Les organismes littoraux manifestent des relations trophiques complexes en raison de l'hétérogénéité de la ressource trophique et spatiale, du confinement de communautés différentes (végé-taux macrophytes, périphyton, zooplancton, zoobenthos, ichthyofaune), de la succession d'espèces (jeunes stades ontogénétiques du poisson) et du rôle des espèces non indigènes (Dembski, 2005 ;Maazouzi, 2006 ;Maazouzi et al, 2007Maazouzi et al, , 2008aMaazouzi et al, , 2008bDembski et al, 2008). Dans le cas particulier de la perche soleil, ces relations trophiques seront prolongées par l'examen de contenus digestifs et de biomanipulations impliquant des représentants des ré-seaux trophiques littoraux.…”

Section: Conclusion Et Perspectivesunclassified

“…À notre connaissance, aucun autre site instrumenté ne réunit les possibilités d'examiner les effets à moyen terme d'un échauffement (de plusieurs degrés Celsius) sur le poisson à l'échelle de la communauté tout en considérant l'occupation spatiale et des éléments de la dynamique de population des espèces. L'objectif de cette synthèse sera donc à la fois de caractériser les traits biologiques du poisson ainsi que la composition de l'ichthyocénose vivant depuis plusieurs générations dans le Mirgenbach (1986Mirgenbach ( -2006 (Pihan, 1986à 2005, Vein et al, 140 G. Masson et al 1990Dubost, 1996 ;Dembski et al, 2007 ;Maazouzi et al, 2008aMaazouzi et al, , 2008b. L'été, les aéro-réfrigérants contribuent à un meilleur refroidissement des eaux alimentant le Mirgenbach qu'en hiver.…”

Section: Introductionunclassified

Les populations de poissons dans le réservoir du Mirgenbach (1986-2006, CNPE Cattenom, France) : un modèle pour l'étude des effets d'un changement thermique global ?

Masson¹,

Dembski

Staffolani³

et al. 2008

Hydroécol. Appl.

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Les populations de poissons dans le réservoir du Mirgenbach (1986-2006 : un modèle pour l'étude des effets d'un changement thermique global ?Fish populations in the Mirgenbach reservoir (1986-2006 Résumé -Depuis 1986, le réservoir du Mirgenbach, mis en eau en 1985 reçoit les eaux échauffées issues de la centrale électronucléaire de Cattenom. Les conditions physicochimiques et la biomasse chlorophyllienne sont étudiées depuis cette date, les poissons étant échantillonnés selon un protocole standardisé depuis le couplage de la dernière tranche, en 1991. L'évolution thermique est décrite puis comparée à d'autres systèmes naturels ou échauffés. Dans le Mirgenbach, l'isolement des populations de poissons et le brassage de l'eau facilitent l'observation d'une incidence des rejets sur l'évolution du peuplement, l'abondance des populations et les traits biologiques individuels. Le seuil élevé de la température hivernale et son augmentation précoce déclenchent une reproduction et un développement individuels rapides. Le plan d'eau connaît un déclin régulier de la biomasse (chlorophylle et poissons) tandis que la contamination cuprique augmente. La diminution progressive pour plusieurs espèces, des effectifs, de la longévité, des longueurs maximales, de l'âge et de la taille à maturité sexuelle contribuent au déclin de la masse globale ou individuelle maximale. L'effet de ces contraintes s'observa d'abord sur les perches et gardons avant de s'étendre aux espèces thermophiles (brèmes communes et bordelières, perche soleil). D'après l'examen de la littérature, ces observations résulteraient de l'altération du développement sexuel et du défaut croissant en ressource trophique. Mots clés -rejets thermiques, poisson, traits biologiques Abstract -The Mirgenbach reservoir was filled in 1985 and received since 1986 the overheated cooling waters of the electronuclear power plant of Cattenom. Physicochemical conditions and chlorophyll biomass were studied from that time. Fishes were sampled according to a standardized protocol since the coupling of the last unit in 1991. The thermal evolution was described then compared with the other natural or overheated systems. In the Mirgenbach, the isolation of fish populations with well mixed waters, facilitated the observation of incidence of the discharges on community evolution, abundance of populations and individual biological traits. The high threshold of the wintry temperature and its early rise set off the reproduction and causes a fast individual development. The reservoir knew a regular decline of the biomass (chlorophyll and fishes) whereas copper contamination increased. The progressive decrease for several species, of population size, longevity, maximal lengths, size and age of sexual maturity, contributed to the decline of the global or individual maximal mass. These constraints pressed at first on perch and roach and then on thermophilic species (bream and silver bream, pumpkinseed fish). According to literature, these constraints may be explained by a sexual developmental i...

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Midsummer heat wave effects on lacustrine plankton: Variation of assemblage structure and fatty acid composition

Cited by 40 publications

References 57 publications

Efficiency of transfer of essential polyunsaturated fatty acids versus organic carbon from producers to consumers in a eutrophic reservoir

Efficiency of transfer of essential polyunsaturated fatty acids versus organic carbon from producers to consumers in a eutrophic reservoir

Impacts of algal blooms removal by chitosan-modified soils on zooplankton community in Taihu Lake, China

Les populations de poissons dans le réservoir du Mirgenbach (1986-2006, CNPE Cattenom, France) : un modèle pour l'étude des effets d'un changement thermique global ?

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