Relationships between phytoplankton and periphyton communities in a central Iowa stream

Roeder, Donald R.

doi:10.1007/bf00023353

Cited by 18 publications

(17 citation statements)

References 13 publications

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“…Our results showed that the epilithic biofilm was an essential and constant provider of diatoms for the water column in the Garonne River, thus corroborating the pioneering work of Roeder (1977). However, during the summer low flow period, susbstantial numbers of planktonic diatoms can settle on the biofilm.…”

Section: Discussionsupporting

confidence: 88%

“…For example, Cocconeis spp. are epiphytes and their summer abundance could also be explained by the increasing availability of macrophytes in Garonne pools and/or of filamentous green algae in the biofilm during summer (Eulin & Le Cohu 1998).Our results showed that the epilithic biofilm was an essential and constant provider of diatoms for the water column in the Garonne River, thus corroborating the pioneering work of Roeder (1977). However, during the summer low flow period, susbstantial numbers of planktonic diatoms can settle on the biofilm.…”

supporting

confidence: 86%

“…Also meio-and macrofauna drilling and grazing the biofilm influence its architecture and growth dynamics (Lawrence et al 2002, Gaudes et al 2006, Kathol et al 2011. In the middle course of fast-moving rivers, cells occurring in the water column are derived essentially from the detachment of phototrophic biofilms (Roeder 1977, Ameziane et al 2003. Conversely, drifting microalgae could represent a continuous source of colonizers for benthic biofilms, implying a certain upstream−downstream connectivity of microphytobenthic communities (Pusch et al 1998).…”

Section: Introductionmentioning

confidence: 99%

“…These reservoirs supply the Garonne with a large number of phytoplankton cells (Ameziane et al 2003). Planktonic (centric) diatoms are less mobile than those with a raphe (pennate diatoms), and this low mobility could favour their entrapment within the biofilm matrix during low flow conditions in rivers (Roeder 1977).The pelagic and biofilm diatom communities differed most under periods of low water flow and were more alike under high flow conditions. In our study, the distribution of the diatom species in the 2 compartments and, hence, their benthic−pelagic exchanges were primarily shaped by discharge.…”

mentioning

confidence: 99%

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Contribution of epilithic diatoms to benthic-pelagic coupling in a temperate river

Tekwani¹,

Majdi²,

Mialet³

et al. 2013

Aquat. Microb. Ecol.

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Water residence time in the middle course of rivers is often too short to allow substantial phytoplankton development, and primary production is essentially provided by benthic phototrophic biofilms. However, cells occurring in the water column might derive from biofilm microalgae, and, reciprocally, sedimenting microalgae could represent a continuous source of colonizers for benthic biofilms. A comparative study of biofilm and pelagic microphytic communities (with special focus on diatoms) was carried out over 15 mo in the Garonne River, France. Diatoms dominated both biofilm and pelagic microphytic communities. Typically benthic diatoms were found in high abundance in the water column, and their biomass in the water was correlated with their biomass in the biofilm, indicating the benthic origin of these cells. Variations in river discharge and temperature drove the temporal distribution of benthic and pelagic communities: under high flow mixing (winter) communities showed the greatest similarity, and during low flow (summer) they differed the most. Even during low flow, typical benthic species were observed in the water column, indicating that benthic−pelagic exchanges were not exclusively due to high water flow. Moreover, during low flow periods, planktonic diatoms typically settled within biofilms, presumably because of higher water residence times, and/or upstream reservoir flushing.KEY WORDS: Periphyton · Distribution · Biofilm · Microphytobenthos · Phytoplankton · Algal ecology · Community structure · HPLC Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 69: [47][48][49][50][51][52][53][54][55][56][57] 2013 Benthic algae on the river bed are generally associated with heterotrophic microorganisms (bacteria, flagellates and ciliates) embedded in a mucous matrix composed of exopolymeric exudates (EPS) and trapped detritic and mineral particles, to form biofilms (Lock et al. 1984, Romaní et al. 2004. These biofilms are shaped by abiotic and biotic influences (e.g. light, flow, nutrients, grazing, allelopathy) that affect their structure and functions (e.g. Hillebrand 2002, Sabater et al. 2002, Lyautey et al. 2005a, Boulêtreau et al. 2006, Mathieu et al. 2007). The dynamics of epilithic biofilms include a growth phase, corresponding to an ecological succession of microbial colonizers onto the substratum (e.g. Korte & Blinn 1983, Lyautey et al. 2005a, and a detachment phase. Detachment of components of the biofilm can occur either through flow abrasion and/or through self-detachment processes (Biggs & Close 1989, Boulêtreau et al. 2006. Also meio-and macrofauna drilling and grazing the biofilm influence its architecture and growth dynamics (Lawrence et al. 2002, Gaudes et al. 2006, Kathol et al. 2011. In the middle course of fast-moving rivers, cells occurring in the water column are derived essentially from the detachment of phototrophic biofilms (Roeder 1977, Ameziane et al. 2003. Conversely, drifting microalgae could represent a continuous source of...

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Section: Discussionsupporting

confidence: 88%

supporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Contribution of epilithic diatoms to benthic-pelagic coupling in a temperate river

Tekwani¹,

Majdi²,

Mialet³

et al. 2013

Aquat. Microb. Ecol.

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“…Simultaneously, at the central site where a Charophyte meadow stabilizes sediments and reduces sediment resuspension, maximal net PP was due to two alternating phytoplankton assemblages (D and S1 functional groups sensu Reynolds & al., 2002), namely, an epipelic light-stressed meroplankton (dominated by Nitzschia acicularis; Roeder, 1977), which has a low chlorophyll-a content and is a relatively productive population (Schallenberg & Burns, 2004), and a group dominated by Planktothrix.…”

Section: Ent Central Site Par Attenuationmentioning

confidence: 99%

The importance of phytoplankton production for carbon budgets in a semiarid floodplain wetland

Álvarez‐Cobelas¹,

Angeler²,

Rojo³

et al. 2011

Anal. Jard. Bot. Madr.

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Phytoplankton production (PP) in wetlands is not measured as often as that of macrophytes. A three year-study during a period of sustained high flooding was undertaken in a central Spanish floodplain wetland (Las Tablas de Daimiel National Park) to determine net PP, its spatial heterogeneity and controlling factors, and compare it with primary production in macrophyte communities. This enabled us to estimate carbon budgets for each community. All PP variables showed high spatial and temporal variability among sites, resulting in low coherence even when flooding connected all sites. Net PP corresponded to 25-36% of submerged plant production and 3-10% of helophyte production. Net PP was controlled by different size fractions of phytoplankton biomass at different wetland sites. Neither nutrients nor zooplankton affected net PP or productivity. A high spatiotemporal variability of PP in wetlands occurs arising from complex processes that affect the underwater light field. Carbon budgets of phytoplankton often exceeded those of submerged macrophytes and attained between 4 and 37% of helophyte budgets. Although usually considered to be marginal, our study shows that PP in the open water of wetlands should be taken into account for determining accurate wetland carbon budgets, mostly in periods of high flooding, which often result in changing the carbon budget of primary producers.Keywords: chlorophyll-specific net primary production, plankton biomass, dissolved organic carbon, nutrients, zooplankton, macrophyte production. ResumenÁlvarez-Cobelas, M., G. Angeler, D., Rojo, C. & Cirujano, S. 2011. La importancia de la producción fitoplanctónica para los balances de carbono en un humedal semiárido de llanura de inundación. Anales Jard. Bot. Madrid 68(2): 253-267 (en inglés).La producción de fitoplancton (PF) en los humedales no se mide tan a menudo como la de los macrófitos. En este estudio se lleva a cabo un trabajo de tres años durante un periodo de gran inun dación en un humedal de llanura de inundación (Parque Nacional de Las Tablas de Daimiel) a fin de determinar la producción neta del fitoplancton, su heterogeneidad espacial y los factores que la controlan. También comparamos la PF con la producción primaria de las comunidades de macrófitos, lo cual nos permite estimar las cantidades de carbono que fija cada comunidad vegetal. Todas las variables relacionadas con la PF mostraron mucha variabilidad espacial y temporal, lo cual dio como resultado una escasa relación entre la producción de unos lugares y otros, incluso cuando la inundación los conectó a todos. La PF neta estuvo entre un 25 y un 36% de la producción de los macrófitos sumergidos y entre un 3 y un 10% de la producción de los helófitos. La PF neta estuvo controlada por algas de diferente tamaño en los distintos sitios del humedal. Ni los nutrientes ni el zooplancton afectaron a la PF neta o a su productividad. La gran variabilidad espacio-temporal de la PF en los humedales se debe a una serie de procesos complejos que afectan al ambiente luminoso subacuát...

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A Hybrid Individual‐Based and Food Web–Ecosystem Modeling Approach for Assessing Ecological Risks to the Topeka Shiner (Notropis topeka): A Case Study with Atrazine

Bartell

Schmolke

Green

et al. 2019

Enviro Toxic and Chemistry

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A hybrid model was used to characterize potential ecological risks posed by atrazine to the endangered Topeka shiner. The model linked a Topeka shiner individual‐based bioenergetics population model (TS‐IBM) to a comprehensive aquatic system model (CASMTS) to simulate Topeka shiner population and food web dynamics for an Iowa (USA) headwater pool. Risks were estimated for monitored concentrations in Iowa, Missouri, and Nebraska (USA), and for monitored concentrations multiplied by 2, 4, and 5. Constant daily atrazine concentrations of 10, 50, 100, and 250 µg/L were assessed. Exposure–response functions were developed from published atrazine toxicity data (median effect concentrations [EC50s] and no‐observed‐effect concentrations). Two toxicity scenarios were developed: the first included sensitive and insensitive species of algae, and the second reduced algal EC50 values to increase atrazine sensitivity. Direct and indirect effects of atrazine on Topeka shiner prey were modeled; direct effects on Topeka shiner were not assessed. Risks were characterized as differences between population biomass values of 365‐d baseline and exposure simulations. The results indicated no discernable food web effects for monitored atrazine concentrations or constant exposures of 10 µg/L on Topeka shiner populations for either toxicity scenario. Magnified monitored concentrations and higher constant concentrations produced greater modeled indirect effects on Topeka shiners. The hybrid model transparently combines species‐specific and surrogate species data to estimate food web responses to environmental stressors. The model is readily updated by new data and is adaptable to other species and ecosystems. Environ Toxicol Chem 2019;38:2243–2258. © 2019 SETAC.

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Relationships between phytoplankton and periphyton communities in a central Iowa stream

Cited by 18 publications

References 13 publications

Contribution of epilithic diatoms to benthic-pelagic coupling in a temperate river

Contribution of epilithic diatoms to benthic-pelagic coupling in a temperate river

The importance of phytoplankton production for carbon budgets in a semiarid floodplain wetland

A Hybrid Individual‐Based and Food Web–Ecosystem Modeling Approach for Assessing Ecological Risks to the Topeka Shiner (Notropis topeka): A Case Study with Atrazine

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