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Articles de revues sur le sujet « Planktonic food web »

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Auteur : Grafiati
Publié le 1 avril 2023

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1

Danielsdottir, Marta G., Michael T. Brett et George B. Arhonditsis. « Phytoplankton food quality control of planktonic food web processes ». Hydrobiologia 589, no 1 (24 mai 2007) : 29–41. http://dx.doi.org/10.1007/s10750-007-0714-6.

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2

Rojo, Carmen, María A. Rodrigo, Guillem Salazar et Miguel Álvarez-Cobelas. « Nitrate uptake rates in freshwater plankton : the effect of food web structure ». Marine and Freshwater Research 59, no 8 (2008) : 717. http://dx.doi.org/10.1071/mf08023.

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Nitrate incorporation rates by primary producers and the transfer of nitrogen to upper planktonic food web levels in different seasons (spring and summer of different years) were studied using a microcosm experimental approach. The study communities were natural plankton communities from Colgada Lake (central Spain), which is heavily polluted by nitrate. Natural δ15N in phytoplankton and zooplankton was measured and experiments were performed on the 15N supply. Naturally derived δ15N varied from 7.4 to 8.6‰ and from 10.0 to 16.8‰ in phytoplankton and zooplankton respectively. Nitrogen incorporation rates ranged from 0.006 to 0.036 μM h–1 and from 0.0004 to 0.0014 μM h–1 in phytoplankton and zooplankton respectively. The differences in natural δ15N levels and nitrogen incorporation rates between plankton fractions from seasonally different communities reported in the present study suggested that the nitrogen uptake by planktonic communities in Colgada Lake depend on different combinations of dominant zooplankters and phytoplankton size structure. A higher level of nitrogen uptake by phytoplankton occurred when small algae were dominant without competitors (larger algae) or main predators (herbivorous zooplankters). This was because copepods, with the lowest zooplankton nitrogen uptake, were dominant. Phytoplankton nitrogen uptake was lower when big algae were dominant.
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Perhar, Gurbir, et George B. Arhonditsis. « The effects of seston food quality on planktonic food web patterns ». Ecological Modelling 220, no 6 (mars 2009) : 805–20. http://dx.doi.org/10.1016/j.ecolmodel.2008.12.019.

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Putland, JN, et RL Iverson. « Microzooplankton : major herbivores in an estuarine planktonic food web ». Marine Ecology Progress Series 345 (13 septembre 2007) : 63–73. http://dx.doi.org/10.3354/meps06841.

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5

Jackson, George A. « Effect of coagulation on a model planktonic food web ». Deep Sea Research Part I : Oceanographic Research Papers 48, no 1 (janvier 2001) : 95–123. http://dx.doi.org/10.1016/s0967-0637(00)00040-6.

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6

Paterson, M. J., D. Findlay, K. Beaty, W. Findlay, E. U. Schindler, M. Stainton et G. McCullough. « Changes in the planktonic food web of a new experimental reservoir ». Canadian Journal of Fisheries and Aquatic Sciences 54, no 5 (1 mai 1997) : 1088–102. http://dx.doi.org/10.1139/f97-018.

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Changes in plankton community structure were examined in an experimental reservoir (Lake 979) before and after impoundment. The role of allochthonous organic matter in planktonic food webs is unclear, and reservoir creation can be viewed as an extreme manipulation of terrestrial organic matter inputs. After impoundment of Lake 979, concentrations of phosphorus, nitrogen, and dissolved organic carbon increased as a result of decomposition of flooded terrestrial organic matter. In the first year of impoundment, mean bacterial biomass increased 10 times , and individual bacterial cell volumes increased 2 times over pre-flooding averages. Phytoplankton production and biomass decreased to approximately 25% of pre-flooding levels. Zooplankton biomass and production by Cladocera increased 10 times , and zooplankton community composition changed from dominance by small-sized Bosmina longirostris to dominance by large Daphnia rosea. In the first year of impoundment, production by Cladocera usually exceeded phytoplankton14C productivity, suggesting that the main pathway of carbon flow to secondary producers shifted from an autochthonous to an allochthonous base derived from flooded terrestrial vegetation. In the second year of flooding, bacterial biomass decreased and phytoplankton biomass was higher than in the two previous years of study.
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Makareviciute-Fichtner, Kriste, Birte Matthiessen, Heike K. Lotze et Ulrich Sommer. « Decrease in diatom dominance at lower Si:N ratios alters plankton food webs ». Journal of Plankton Research 42, no 4 (27 juin 2020) : 411–24. http://dx.doi.org/10.1093/plankt/fbaa032.

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Abstract Many coastal oceans experience not only increased loads of nutrients but also changes in the stoichiometry of nutrient supply. Excess supply of nitrogen and stable or decreased supply of silicon lower silicon to nitrogen (Si:N) ratios, which may decrease diatom proportion in phytoplankton. To examine how Si:N ratios affect plankton community composition and food web structure, we performed a mesocosm experiment where we manipulated Si:N ratios and copepod abundance in a Baltic Sea plankton community. In high Si:N treatments, diatoms dominated. Some of them were likely spared from grazing unexpectedly resulting in higher diatom biomass under high copepod grazing. With declining Si:N ratios, dinoflagellates became more abundant under low and picoplankton under high copepod grazing. This altered plankton food web structure: under high Si:N ratios, edible diatoms were directly accessible food for copepods, while under low Si:N ratios, microzooplankton and phago-mixotrophs (mixoplankton) were a more important food source for mesograzers. The response of copepods to changes in the phytoplankton community was complex and copepod density-dependent. We suggest that declining Si:N ratios favor microzoo- and mixoplankton leading to increased complexity of planktonic food webs. Consequences on higher trophic levels will, however, likely be moderated by edibility, nutritional value or toxicity of dominant phytoplankton species.
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8

Sierszen, Michael E., Gregory S. Peterson et Jill V. Scharold. « Depth-specific patterns in benthic–planktonic food web relationships in Lake Superior ». Canadian Journal of Fisheries and Aquatic Sciences 63, no 7 (1 juillet 2006) : 1496–503. http://dx.doi.org/10.1139/f06-057.

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In an investigation of the spatial characteristics of Laurentian Great Lakes food webs, we examined the trophic relationship between benthic amphipods (Diporeia) and plankton in Lake Superior. We analyzed the carbon and nitrogen stable isotope ratios of Diporeia and plankton at stations in water column depths of 4–300 m. Neither δ15N nor δ13C of plankton from the upper 50 m of the water column varied significantly with station depth. Diporeia isotope ratios exhibited depth-specific patterns reflecting changes in food sources and food web relationships with plankton. Diporeia was 13C enriched at station depths of <40 m, reflecting increased dietary importance of benthic algae. There was a systematic increase in Diporeia δ15N with depth, which appeared to result from a combination of dietary shifts in the nearshore and decompositional changes in Diporeia's principal food, sedimented plankton, in deep habitats. Diporeia δ13C and δ15N together described changes in food web isotope baseline with depth. They also discriminated three depth strata representing photic, mid-depth, and profundal zones. These findings have implications for our understanding of Great Lakes food webs and analyses of trophic position within them, the ecology of zoobenthos and plankton communities, and sampling designs for large lakes.
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9

Segura, A. M., D. Calliari, B. L. Lan, H. Fort, C. E. Widdicombe, R. Harmer et M. Arim. « Community fluctuations and local extinction in a planktonic food web ». Ecology Letters 20, no 4 (27 février 2017) : 471–76. http://dx.doi.org/10.1111/ele.12749.

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10

Setälä, Outi, Vivi Fleming-Lehtinen et Maiju Lehtiniemi. « Ingestion and transfer of microplastics in the planktonic food web ». Environmental Pollution 185 (février 2014) : 77–83. http://dx.doi.org/10.1016/j.envpol.2013.10.013.

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11

De Laender, Frederik, Karline Soetaert, Karel A. C. De Schamphelaere, Jack J. Middelburg et Colin R. Janssen. « Ecological significance of hazardous concentrations in a planktonic food web ». Ecotoxicology and Environmental Safety 73, no 3 (mars 2010) : 247–53. http://dx.doi.org/10.1016/j.ecoenv.2009.12.008.

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12

Jackson, George A., et Peter M. Eldridge. « Food web analysis of a planktonic system off Southern California ». Progress in Oceanography 30, no 1-4 (janvier 1992) : 223–51. http://dx.doi.org/10.1016/0079-6611(92)90014-q.

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13

FRANCE, ROBERT L. « Omnivory, vertical food-web structure and system productivity : stable isotope analysis of freshwater planktonic food webs ». Freshwater Biology 57, no 4 (28 février 2012) : 787–94. http://dx.doi.org/10.1111/j.1365-2427.2012.02744.x.

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14

Gu, Binhe, Donald M. Schell et Vera Alexander. « Stable Carbon and Nitrogen Isotopic Analysis of the Plankton Food Web in a Subarctic Lake ». Canadian Journal of Fisheries and Aquatic Sciences 51, no 6 (1 juin 1994) : 1338–44. http://dx.doi.org/10.1139/f94-133.

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Carbon and nitrogen stable isotopes (δ13C and δ15N) were used to track energy flow and nutrient cycling pathways in the plankton food web of a subarctic Alaskan lake. Results indicated that planktonic primary production was the major energy source fueling the zooplankton community. In spring, δ15N of Daphnia was strongly influenced by atmospheric nitrogen derived from a N2-fixing blue-green algal bloom. In winter, δ13C evidence suggested that phytoplankton comprised a small fraction (~15%) of particulate organic matter (POM) in the water column, largely due to low primary productivity. The disparity between δ13C of POM and Daphnia in winter may result from preferential assimilation of isotopically light algal carbon from POM. Nitrogen isotope values showed that Heterocope, a presumed carnivore, probably relied heavily on POM as a nutrient source. In common with some arctic lakes, the δ15N data showed less than three trophic levels in this plankton food web. The energy transfer pathways and trophic levels revealed a simple plankton trophic structure in this subarctic lacustrine system.
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15

Que, Yanfu, Jiayi Xie, Jun Xu, Weitao Li, Ezhou Wang et Bin Zhu. « Ecological Influences of Water-Level Fluctuation on Food Web Network ». Water 13, no 17 (29 août 2021) : 2371. http://dx.doi.org/10.3390/w13172371.

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Seasonal water-level fluctuations may lead to changes in river nutrients, which causes corresponding changes in the trophic structure of an aquatic food web, and finally affects the whole ecosystem. In this study, we focused on the Ganjing River, a tributary of the Yangtze River, China. Common organisms were sampled and measured for carbon and nitrogen stable isotopes in the wet and dry seasons, respectively, and the relative contributions of different food sources were combined to construct the food web, so as to realize the influence of water-level fluctuation on aquatic food web. Our results showed that basal food sources for fish consumers were endogenous carbon sources such as POM, zooplankton and zoobenthos in the dry season, while high water level exposed fish to more diverse and abundant food sources, and the contribution proportions of exogenous carbon sources (e.g., terrestrial detritus) to consumers increased in the wet season. In parallel, the abundance and species diversity of fish were higher than those in the dry season. Most fish species had relatively higher trophic levels in the dry season compared to the wet season, because the increase in fish densities led to an increase in piscivores fish. The food web was composed of planktonic and benthic food chains in the dry season. During the wet season, the planktonic food chain was dominant, followed by the herbivorous food chain, and the benthic food chain was relatively less important. Therefore, water-level fluctuation may alter the trophic linkages within fish communities, which contributed to a more complex and interconnected food web. Moreover, as we expect, the stable isotope analysis food web was broadly in line with the gut content analysis food web.
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16

Kunzmann, Alessandra Janina, Harald Ehret, Elizabeth Yohannes, Dietmar Straile et Karl-Otto Rothhaupt. « Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake ». Journal of Plankton Research 41, no 6 (novembre 2019) : 955–66. http://dx.doi.org/10.1093/plankt/fbz067.

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Abstract Cultural oligotrophication is expected to shift lake zooplankton to become dominated by calanoid copepods. Hence, understanding the influence of calanoids on the taxonomic and size structure of the lower plankton food web is crucial for predicting the effects of oligotrophication on energy fluxes in these systems. We studied the effect of an omnivorous calanoid, Eudiaptomus gracilis, on the lower planktonic food web using an in situ incubation approach in large and deep Lake Constance. We show that E. gracilis significantly reduced ciliate, phytoplankton, rotifer, but increased bacteria biovolume. Highest clearance rates were observed for ciliates whose biovolume declines may have caused a release of predation pressure on bacteria. E. gracilis grazing shifted the size structure of the phytoplankton community by reducing mean phytoplankton cell size (directional selection) and simultaneously increasing cell size variance (disruptive selection). Ciliate cell sizes experienced a similar selective regime in one of the experiments, whereas in the other two experiments, no change of size structure was detected. Results suggest strong influences of E. gracilis grazing on the lower plankton food web and a significant shift in phytoplankton size structure. For evaluating detailed effects of omnivorous consumers on plankton size structure, cascading interactions need to be considered.
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17

MEDINA-SÁNCHEZ, Juan Manuel, Manuel VILLAR-ARGAIZ, Pedro SÁNCHEZ-CASTILLO, Luis CRUZ-PIZARRO et Presentación CARRILLO. « Structure changes in a planktonic food web : biotic and abiotic controls ». Journal of Limnology 58, no 2 (1 août 1999) : 213. http://dx.doi.org/10.4081/jlimnol.1999.213.

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18

Ptacnik, Robert, Ulrich Sommer, Thomas Hansen et Volker Martens. « Effects of microzooplankton and mixotrophy in an experimental planktonic food web ». Limnology and Oceanography 49, no 4part2 (31 janvier 2004) : 1435–45. http://dx.doi.org/10.4319/lo.2004.49.4_part_2.1435.

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19

Franzè, Gayantonia, James J. Pierson, Diane K. Stoecker et Peter J. Lavrentyev. « Diatom-produced allelochemicals trigger trophic cascades in the planktonic food web ». Limnology and Oceanography 63, no 3 (12 décembre 2017) : 1093–108. http://dx.doi.org/10.1002/lno.10756.

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20

Vézina, Alain F., et Michael L. Pace. « An Inverse Model Analysis of Planktonic Food Webs in Experimental Lakes ». Canadian Journal of Fisheries and Aquatic Sciences 51, no 9 (1 septembre 1994) : 2034–44. http://dx.doi.org/10.1139/f94-206.

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We used inverse methods to reconstruct carbon flows in experimental lakes where the fish community had been purposely altered. These analyses were applied to three years of data from a reference lake and two experimental lakes located in Gogebic County, Michigan. We reconstructed seasonally averaged flows among two size groups of phytoplankton, heterotrophic bacteria, microzooplankton, cladocerans, and copepods. The inverse analysis produced significantly different flow networks for the different lakes that agreed qualitatively with known chemical and biological differences between lakes and with other analyses of the impact of fish manipulations on food web structure and dynamics. The results pointed to alterations in grazing pressure on the phytoplankton that parallel changes in the size and abundance of cladocerans and copepods among lakes. Estimated flows through the microbial food web indicated low bacterial production efficiencies and small carbon transfers from the microbial food web to the larger zooplankton. This study demonstrates the use of inverse methods to identify and compare flow patterns across ecosystems and suggests that microbial flows are relatively insensitive to changes at the upper trophic levels.
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Santoro, Alyson E., R. Alexander Richter et Christopher L. Dupont. « Planktonic Marine Archaea ». Annual Review of Marine Science 11, no 1 (3 janvier 2019) : 131–58. http://dx.doi.org/10.1146/annurev-marine-121916-063141.

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Archaea are ubiquitous and abundant members of the marine plankton. Once thought of as rare organisms found in exotic extremes of temperature, pressure, or salinity, archaea are now known in nearly every marine environment. Though frequently referred to collectively, the planktonic archaea actually comprise four major phylogenetic groups, each with its own distinct physiology and ecology. Only one group—the marine Thaumarchaeota—has cultivated representatives, making marine archaea an attractive focus point for the latest developments in cultivation-independent molecular methods. Here, we review the ecology, physiology, and biogeochemical impact of the four archaeal groups using recent insights from cultures and large-scale environmental sequencing studies. We highlight key gaps in our knowledge about the ecological roles of marine archaea in carbon flow and food web interactions. We emphasize the incredible uncultivated diversity within each of the four groups, suggesting there is much more to be done.
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Jones, SE, et JT Lennon. « Evidence for limited microbial transfer of methane in a planktonic food web ». Aquatic Microbial Ecology 58 (8 décembre 2009) : 45–53. http://dx.doi.org/10.3354/ame01349.

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23

Noonburg, Erik G., Brian J. Shuter et Peter A. Abrams. « Indirect effects of zebra mussels (Dreissena polymorpha) on the planktonic food web ». Canadian Journal of Fisheries and Aquatic Sciences 60, no 11 (1 novembre 2003) : 1353–68. http://dx.doi.org/10.1139/f03-116.

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The exotic zebra mussel (Dreissena polymorpha) has caused dramatic reductions in phytoplankton density in lakes with dense mussel populations. However, the indirect effects of this invader on other trophic groups have been inconsistent and difficult to interpret. In some lakes, zebra mussels appear to have had little effect on zooplankton density, despite decreasing the abundance of their phytoplankton prey. We analyze food web models to test hypothesized mechanisms for the absence of a strong effect of dreissenids on zooplankton. Our results suggest that neither reduced inedible algal interference with zooplankton filtering nor reduced phytoplankton self-shading is sufficient to explain the insensitivity of zooplankton populations to dreissenid competition. Instead, we show how the impact of benthic filter feeders can be influenced by the rate of mixing within a basin, which limits phytoplankton delivery to the benthos. We explore the predictions of a simple spatially structured model and demonstrate that differences in abiotic factors that control mixing can result in large differences in direct and indirect effects of zebra mussel filtering.
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Havens, K. E., J. R. Beaver, D. A. Casamatta, T. L. East, R. T. James, P. Mccormick, E. J. Phlips et A. J. Rodusky. « Hurricane effects on the planktonic food web of a large subtropical lake ». Journal of Plankton Research 33, no 7 (21 février 2011) : 1081–94. http://dx.doi.org/10.1093/plankt/fbr002.

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Verity, Peter G., James A. Yoder, S. Stephen Bishop, James R. Nelson, Deborah B. Craven, Jackson O. Blanton, Charles Y. Robertson et Craig R. Tronzo. « Composition, productivity and nutrient chemistry of a coastal ocean planktonic food web ». Continental Shelf Research 13, no 7 (juillet 1993) : 741–76. http://dx.doi.org/10.1016/0278-4343(93)90026-t.

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Paterson, M. J., D. Findlay, K. Beaty, W. Findlay, E. U. Schindler, M. Stainton et G. McCullough. « Changes in the planktonic food web of a new e×perimental reservoir ». Canadian Journal of Fisheries and Aquatic Sciences 54, no 5 (1997) : 1088–102. http://dx.doi.org/10.1139/cjfas-54-5-1088.

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27

Kuuppo, P., R. Autio, H. Kuosa, O. Setälä et S. Tanskanen. « Nitrogen, Silicate and Zooplankton Control of the Planktonic Food-web in Spring ». Estuarine, Coastal and Shelf Science 46, no 1 (janvier 1998) : 65–75. http://dx.doi.org/10.1006/ecss.1997.0258.

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28

Garstecki, T., S. A. Wickham et H. Arndt. « Effects of Experimental Sediment Resuspension on a Coastal Planktonic Microbial Food Web ». Estuarine, Coastal and Shelf Science 55, no 5 (novembre 2002) : 751–62. http://dx.doi.org/10.1006/ecss.2001.0937.

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Comerma, Marta, Juan Carlos García, Joan Armengol, Maria Romero et Karel Šimek. « Planktonic Food Web Structure along the Sau Reservoir (Spain) in Summer 1997 ». International Review of Hydrobiology 86, no 2 (avril 2001) : 195–209. http://dx.doi.org/10.1002/1522-2632(200104)86:2<195 ::aid-iroh195>3.0.co;2-m.

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Zehrer, Reglindis F., Carolyn W. Burns et Sabine Flöder. « Sediment resuspension, salinity and temperature affect the plankton community of a shallow coastal lake ». Marine and Freshwater Research 66, no 4 (2015) : 317. http://dx.doi.org/10.1071/mf13221.

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Climate change is predicted to cause an increasing frequency of storm tides, rising sea levels and water temperatures, and altered precipitation and run-off. Such changes are likely to influence turbidity, salinity and temperature regimes of coastal aquatic ecosystems. To determine possible effects on plankton communities of these ecosystems, we combined feeding experiments with a monitoring study of tidally influenced, polymictic Lake Waihola (New Zealand). The feeding experiments were carried out using dominant Daphnia carinata, and important taxa of heterotrophic nanoflagellates (HNF) and ciliates. The field study encompassed the entire planktonic food web. Moderate levels of turbidity and salinity affected clearance and ingestion rates of D. carinata, HNF and oligotrich ciliates in our feeding experiments. Redundancy analysis identified sediment resuspension, salinity and temperature as important factors affecting the plankton communities in Lake Waihola. A wide variety of biota was affected by sediment resuspension and temperature. Fewer species responded to salinity, most likely due to unusually low salinities throughout the monitoring period. If global warming results in altered turbidity, salinity or temperature regimes in coastal aquatic ecosystems changes might be expected in the structure of their plankton communities, with potential consequences throughout the food web.
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Dexter, Eric, Stephen L. Katz, Stephen M. Bollens, Gretchen Rollwagen-Bollens et Stephanie E. Hampton. « Modeling the trophic impacts of invasive zooplankton in a highly invaded river ». PLOS ONE 15, no 12 (1 décembre 2020) : e0243002. http://dx.doi.org/10.1371/journal.pone.0243002.

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The lower Columbia River (Washington and Oregon, USA) has been heavily invaded by a large number of planktonic organisms including the invasive copepod Pseudodiaptomus forbesi and the planktonic juveniles of the invasive clam, Corbicula fluminea. In order to assess the ecological impacts of these highly abundant invaders, we developed a multivariate auto-regressive (MAR) model of food web dynamics based upon a 12-year time-series of plankton community and environmental data from the Columbia River. Our model results indicate that plankton communities in the lower Columbia River are strongly impacted by the copepod P. forbesi at multiple trophic levels. We observed different ecological effects across different life stages of P. forbesi, with nauplii negatively impacting ciliates and autotrophs, and copepodite stages negatively impacting Daphnia and cyclopoid copepods. Although juvenile C. fluminea were highly abundant in the summer and autumn of each year, our best fit MAR model did not show significant C. fluminea impacts. Our results illustrate the strong ecological impact that some zooplankton invaders may cause within rivers and estuarine systems, and highlight the need for further research on the feeding ecology of the planktonic life-stage of C. fluminea. Overall, our study demonstrates the manner in which long-term, high resolution data sets can be used to better understand the ecological impacts of invasive species among complex and highly dynamic communities.
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Chevrollier, Lou-Anne, Marja Koski, Jens Søndergaard, Stefan Trapp, Denis Worlanyo Aheto, George Darpaah et Torkel Gissel Nielsen. « Bioaccumulation of metals in the planktonic food web in the Gulf of Guinea ». Marine Pollution Bulletin 179 (juin 2022) : 113662. http://dx.doi.org/10.1016/j.marpolbul.2022.113662.

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Uitto, A., AS Heiskanen, R. Lignell, R. Autio et R. Pajuniemi. « Summer dynamics of the coastal planktonic food web in the northern Baltic Sea ». Marine Ecology Progress Series 151 (1997) : 27–41. http://dx.doi.org/10.3354/meps151027.

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Niquil, N., GA Jackson, L. Legendre et B. Delesalle. « Inverse model analysis of the planktonic food web of Takapoto Atoll (French Polynesia) ». Marine Ecology Progress Series 165 (1998) : 17–29. http://dx.doi.org/10.3354/meps165017.

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Stokstad, E. « CLIMATE CHANGE : Changes in Planktonic Food Web Hint At Major Disruptions in Atlantic ». Science 305, no 5690 (10 septembre 2004) : 1548a—1549a. http://dx.doi.org/10.1126/science.305.5690.1548a.

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Murray, Alexander G., et Peter M. Eldridge. « Marine viral ecology : incorporation of bacteriophage into the microbial planktonic food web paradigm ». Journal of Plankton Research 16, no 6 (1994) : 627–41. http://dx.doi.org/10.1093/plankt/16.6.627.

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Fahnenstiel, Gary L., Ann E. Krause, Michael J. McCormick, Hunter J. Carrick et Claire L. Schelske. « The Structure of the Planktonic Food-Web in the St. Lawrence Great Lakes ». Journal of Great Lakes Research 24, no 3 (janvier 1998) : 531–54. http://dx.doi.org/10.1016/s0380-1330(98)70843-3.

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Segovia, Bianca Trevizan, Danielle Goeldner Pereira, Luis Mauricio Bini, Bianca Ramos de Meira, Verônica Sayuri Nishida, Fabio Amodêo Lansac-Tôha et Luiz Felipe Machado Velho. « The Role of Microorganisms in a Planktonic Food Web of a Floodplain Lake ». Microbial Ecology 69, no 2 (12 septembre 2014) : 225–33. http://dx.doi.org/10.1007/s00248-014-0486-2.

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Niquil, Nathalie, J. Ernesto Arias-González, Bruno Delesalle et Robert E. Ulanowicz. « Characterization of the planktonic food web of Takapoto Atoll lagoon, using network analysis ». Oecologia 118, no 2 (23 février 1999) : 232–41. http://dx.doi.org/10.1007/s004420050723.

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NIQUIL, NATHALIE, GRETTA BARTOLI, JOTARO URABE, GEORGE A. JACKSON, LOUIS LEGENDRE, CHRISTINE DUPUY et M. KUMAGAI. « Carbon steady-state model of the planktonic food web of Lake Biwa, Japan ». Freshwater Biology 51, no 8 (août 2006) : 1570–85. http://dx.doi.org/10.1111/j.1365-2427.2006.01595.x.

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Loick‐Wilde, Natalie, Igor Fernández‐Urruzola, Elvita Eglite, Iris Liskow, Monika Nausch, Detlef Schulz‐Bull, Dirk Wodarg, Norbert Wasmund et Volker Mohrholz. « Stratification, nitrogen fixation, and cyanobacterial bloom stage regulate the planktonic food web structure ». Global Change Biology 25, no 3 (9 janvier 2019) : 794–810. http://dx.doi.org/10.1111/gcb.14546.

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Shinada, Akiyoshi, Syuhei Ban et Tsutomu Ikeda. « Seasonal changes in the planktonic food web off Cape Esan, southwestern Hokkaido, Japan ». Plankton and Benthos Research 3, no 1 (2008) : 18–26. http://dx.doi.org/10.3800/pbr.3.18.

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Hampton, Stephanie E., Mark D. Scheuerell et Daniel E. Schindler. « Coalescence in the Lake Washington story : Interaction strengths in a planktonic food web ». Limnology and Oceanography 51, no 5 (septembre 2006) : 2042–51. http://dx.doi.org/10.4319/lo.2006.51.5.2042.

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Maldonado, Maria T., Szymon Surma et Evgeny A. Pakhomov. « Southern Ocean biological iron cycling in the pre-whaling and present ecosystems ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 374, no 2081 (28 novembre 2016) : 20150292. http://dx.doi.org/10.1098/rsta.2015.0292.

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This study aimed to create the first model of biological iron (Fe) cycling in the Southern Ocean food web. Two biomass mass-balanced Ecopath models were built to represent pre- and post-whaling ecosystem states (1900 and 2008). Functional group biomasses (tonnes wet weight km −2 ) were converted to biogenic Fe pools (kg Fe km −2 ) using published Fe content ranges. In both models, biogenic Fe pools and consumption in the pelagic Southern Ocean were highest for plankton and small nektonic groups. The production of plankton biomass, particularly unicellular groups, accounted for the highest annual Fe demand. Microzooplankton contributed most to biological Fe recycling, followed by carnivorous zooplankton and krill. Biological Fe recycling matched previous estimates, and, under most conditions, could entirely meet the Fe demand of bacterioplankton and phytoplankton. Iron recycling by large baleen whales was reduced 10-fold by whaling between 1900 and 2008. However, even under the 1900 scenario, the contribution of whales to biological Fe recycling was negligible compared with that of planktonic consumers. These models are a first step in examining oceanic-scale biological Fe cycling, highlighting gaps in our present knowledge and key questions for future research on the role of marine food webs in the cycling of trace elements in the sea. This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.
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Saint-Béat, Blanche, Frédéric Maps et Marcel Babin. « Unraveling the intricate dynamics of planktonic Arctic marine food webs. A sensitivity analysis of a well-documented food web model ». Progress in Oceanography 160 (janvier 2018) : 167–85. http://dx.doi.org/10.1016/j.pocean.2018.01.003.

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Rollwagen-Bollens, Gretchen, Stephen Bollens, Eric Dexter et Jeffery Cordell. « Biotic vs. abiotic forcing on plankton assemblages varies with season and size class in a large temperate estuary ». Journal of Plankton Research 42, no 2 (mars 2020) : 221–37. http://dx.doi.org/10.1093/plankt/fbaa010.

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Abstract Large river estuaries experience multiple anthropogenic stressors. Understanding plankton community dynamics in these estuaries provides insights into the patterns of natural variability and effects of human activity. We undertook a 2-year study in the Columbia River Estuary to assess the potential impacts of abiotic and biotic factors on planktonic community structure over multiple time scales. We measured microplankton and zooplankton abundance, biomass and composition monthly, concurrent with measurements of chlorophyll a, nutrient concentrations, temperature and salinity, from a dock in the lower estuary. We then statistically assessed the associations among the abundances of planktonic groups and environmental and biological factors. During the late spring high flow period of both years, the lower estuary was dominated by freshwater and low salinity-adapted planktonic taxa, and zooplankton grazers were more strongly associated with the autotroph-dominated microplankton assemblage than abiotic factors. During the early winter period of higher salinity and lower flow, nutrient (P) availability exerted a strong influence on microplankton taxa, while only temperature and upwelling strength were associated with the zooplankton assemblage. Our results indicate that the relative influence of biotic (grazers) and abiotic (salinity, flow, nutrients and upwelling) factors varies seasonally and inter-annually, and among different size classes in the estuarine food web.
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Santos, João Pereira, Lirie Mehmeti et Vera I. Slaveykova. « Simple Acid Digestion Procedure for the Determination of Total Mercury in Plankton by Cold Vapor Atomic Fluorescence Spectroscopy ». Methods and Protocols 5, no 2 (25 mars 2022) : 29. http://dx.doi.org/10.3390/mps5020029.

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Plankton, at the bottom of the food web, play a central role in the entry of mercury into the aquatic biota. To investigate their role in mercury uptake, reliable analytical procedures for Hg analysis are highly sought. Wet digestion procedures for determining total mercury in different biological matrices have been established since years, however only few studies focused on planktonic samples. In the present work, a simple and cost-effective wet digestion method was developed for the determination of total mercury in samples of small plankton material using a cold vapor atomic fluorescence spectroscopy (CVAFS). The optimization of the digestion method was achieved by using glass vessels with Teflon caps, low amount of acids (3 mL w/w 65% HNO3 or 3 mL 50% v/v HNO3), a constant temperature of 85 °C, the presence and absence of pre-ultrasound treatment, and a continuous digestion period (12 h). Certified reference materials IAEA-450 (unicellular alga Scenedesmus obliquus) and BRC-414 (plankton matrix) were used to optimize and validate the digestion method. The recovery efficiency of the proposed method for IAEA-450 and BCR-414 (3.1 mg and 21.5 mg) ranged between 94.1 ± 7.6% and 97.2 ± 4.6%. The method displayed a good recovery efficiency and precision for plankton matrices of low size. Thus, allowing better digestion of planktonic samples for mercury analysis using CVAFS techniques.
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Pace, Michael L., et Jonathan J. Cole. « Effects of whole-lake manipulations of nutrient loading and food web structure on planktonic respiration ». Canadian Journal of Fisheries and Aquatic Sciences 57, no 2 (1 février 2000) : 487–96. http://dx.doi.org/10.1139/f99-279.

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We assessed planktonic respiration in whole-lake manipulations of nutrient loading and food web structure in three manipulated and one unmanipulated lake over 7 years. The manipulations created strong contrasts in zooplankton body size across a series of nutrient loads. Large-bodied zooplankton were suppressed by planktivorous fish in one lake, while in the other two manipulated lakes, large-bodied zooplankton dominated community biomass. Nutrients were added as inorganic N and P. Nutrient loads ranged from background to conditions resembling eutrophic lakes. Planktonic respiration was measured weekly in each lake by dark bottle oxygen consumption. Respiration was low when lakes were not fertilized (average 8.5 µmol O2·L-1·day-1) and was correlated with differences in dissolved organic carbon among the lakes. Respiration increased with nutrient addition to a mean range of 12-25 µmol O2·L-1·day-1; however, respiration differed among lakes at the same nutrient loading. Further, respiration was independent of dissolved organic carbon in the fertilized lakes. Differences in the intensity of zooplankton grazing as determined by food web structure strongly regulated primary and bacterial production across the range of nutrient loads. Consequently, respiration was positively related to primary production, phytoplankton biomass, and bacterial production and inversely related to the average size of crustacean zooplankton.
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Reis, Paula C. J., Luiz A. Martinelli et Francisco A. R. Barbosa. « Basal carbon sources and planktonic food web in a tropical lake : an isotopic approach ». Marine and Freshwater Research 68, no 3 (2017) : 429. http://dx.doi.org/10.1071/mf14322.

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Trophic connections among habitats may be central to food-web dynamics in lakes. Lacustrine zooplankton can rely on basal carbon (C) sources from different origins and plays an important link between these and organisms in higher trophic levels. We investigated the basal C sources supporting the planktonic food web and the trophic relationships among zooplankton size fractions in a tropical lake (Carioca) in Brazil. To do so, we measured the C and nitrogen (N) stable-isotope ratios in basal C sources originated in terrestrial, littoral, and pelagic habitats and in zooplankton size fractions, and data were analysed through Bayesian mixing models. Mesozooplankton showed seasonal variation in resource use, specifically a smaller dependence on algae in the wet than in the dry season. In the wet season, mesozooplankton relied more on the detritivore food chain eating mostly microzooplankton (mode: 95.1%), which in turn consumed mostly terrestrial C in this season (mode: 74.7%). Zooplankton size fractions also occupied different relative trophic positions between seasons. These variations seem to follow the seasonal dynamics of in-lake primary production and of terrestrial C inputs. Also, all size fractions of zooplankton, and particularly Chaoboridae larvae, showed low C staple-isotope values, suggesting the consumption of a missing C source.
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Chaffron, Samuel, Erwan Delage, Marko Budinich, Damien Vintache, Nicolas Henry, Charlotte Nef, Mathieu Ardyna et al. « Environmental vulnerability of the global ocean epipelagic plankton community interactome ». Science Advances 7, no 35 (août 2021) : eabg1921. http://dx.doi.org/10.1126/sciadv.abg1921.

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Marine plankton form complex communities of interacting organisms at the base of the food web, which sustain oceanic biogeochemical cycles and help regulate climate. Although global surveys are starting to reveal ecological drivers underlying planktonic community structure and predicted climate change responses, it is unclear how community-scale species interactions will be affected by climate change. Here, we leveraged Tara Oceans sampling to infer a global ocean cross-domain plankton co-occurrence network—the community interactome—and used niche modeling to assess its vulnerabilities to environmental change. Globally, this revealed a plankton interactome self-organized latitudinally into marine biomes (Trades, Westerlies, Polar) and more connected poleward. Integrated niche modeling revealed biome-specific community interactome responses to environmental change and forecasted the most affected lineages for each community. These results provide baseline approaches to assess community structure and organismal interactions under climate scenarios while identifying plausible plankton bioindicators for ocean monitoring of climate change.
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