Studies on the growth of<i>Cladophora glomerata</i>in laboratory continuous-flow culture

Robinson, Peter; Hawkes, H.A.

doi:10.1080/00071618600650501

Cited by 15 publications

(6 citation statements)

References 11 publications

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“…Light limits algal production in forest streams, and release from light limitation increased autotrophic production ;10 to 30 times from the smallest streams to the two largest sites examined here (Finlay 2004, Warnaars et al 2007. The increase in primary production was due to both increased photosynthetic activity by epilithic diatoms (Finlay 2004) and appearance of large aggregations and mats of Cladophora glomerata (Power et al 2009), a species with high light demands (Robinson andHawkes 1986, Lorenz et al 1991). Increasing autotrophic production and biomass stimulates demand for nutrients, and this likely explains the sharp decrease in dissolved P concentrations observed.…”

Section: Thresholds In Stream Nutrient Chemistrymentioning

confidence: 87%

Light-mediated thresholds in stream-water nutrient composition in a river network

Finlay

Hood

Limm

et al. 2011

Ecology

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The elemental composition of solutes transported by rivers reflects combined influences of surrounding watersheds and transformations within stream networks, yet comparatively little is known about downstream changes in effects of watershed loading vs. in-channel processes. In the forested watershed of a river under a mediterranean hydrologic regime, we examined the influence of longitudinal changes in environmental conditions on water-column nutrient composition during summer base flow across a network of sites ranging from strongly heterotrophic headwater streams to larger, more autotrophic sites downstream. Small streams (0.1-10 km2 watershed area) had longitudinally similar nutrient concentration and composition with low (approximately 2) dissolved nitrogen (N) to phosphorus (P) ratios. Abrupt deviations from this pattern were observed in larger streams with watershed areas > 100 km2 where insolation and algal abundance and production rapidly increased. Downstream, phosphorus and silica concentrations decreased by > 50% compared to headwater streams, and dissolved organic carbon and nitrogen increased by approximately 3-6 times. Decreasing dissolved P and increasing dissolved N raised stream-water N:P to 46 at the most downstream sites, suggesting a transition from N limitation in headwaters to potential P limitation in larger channels. We hypothesize that these changes were mediated by increasing algal photosynthesis and N fixation by benthic algal assemblages, which, in response to increasing light availability, strongly altered stream-water nutrient concentration and stoichiometry in larger streams and rivers.

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Section: Thresholds In Stream Nutrient Chemistrymentioning

confidence: 87%

Light-mediated thresholds in stream-water nutrient composition in a river network

Finlay

Hood

Limm

et al. 2011

Ecology

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“…). Despite cell wall‐binding properties, high levels of heavy metals can be toxic to Cladophora (Robinson and Hawkes , Lamai et al. ).…”

Section: Cladophora Morphology Development and Reproductionmentioning

confidence: 99%

The Genus Cladophora Kützing (Ulvophyceae) as a Globally Distributed Ecological Engineer

Zulkifly

Graham

Young

et al. 2013

Journal of Phycology

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The green algal genus Cladophora forms conspicuous nearshore populations in marine and freshwaters worldwide, commonly dominating peri-phyton communities. As the result of human activities, including the nutrient pollution of nearshore waters, Cladophora-dominated periphyton can form nuisance blooms. On the other hand, Cladophora has ecological functions that are beneficial, but less well appreciated. For example, Cladophora has previously been characterized as an ecological engineer because its complex structure fosters functional and taxonomic diversity of benthic microfauna. Here, we review classic and recent literature concerning taxonomy, cell biology, morphology, reproductive biology, and ecology of the genus Cladophora, to examine how this alga functions to modify habitats and influence littoral biogeochemistry. We review the evidence that Cladophora supports large, diverse populations of microalgal and bacterial epiphytes that influence the cycling of carbon and other key elements, and that the high production of cellulose and hydrocarbons by Cladophora-dominated periphyton has the potential for diverse technological applications, including wastewater remediation coupled to renewable biofuel production. We postulate that well-known aspects of Cladophora morphology, hydrodynamically stable and perennial holdfasts, distinctively branched architecture, unusually large cell and sporangial size and robust cell wall construction, are major factors contributing to the multiple roles of this organism as an ecological engineer.

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“…Many studies have documented the association of C. glomerata with high nutrient inputs. In fact it is cited as a reason for its occurrence below hypolimnetic releases from reservoirs (Robinson andHawkes 1986, Dodds 1991b). The increased abundance (Ն30%) of mucilaginous cyanobacteria, such as Tolypothrix, during the high constant flows below GCD suggests that nitrogen is being fixed by these organisms in the anaerobic mucilage matrices of the new phytobenthic community.…”

Section: Inflow and Reservoir Influence On Phytobenthosmentioning

confidence: 99%

Algal Ecology in Tailwater Stream Communities: The Colorado River Below Glen Canyon Dam, Arizona

Blinn

Shannon

Benenati

et al. 1998

Journal of Phycology

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Studies on the growth ofCladophora glomeratain laboratory continuous-flow culture

Cited by 15 publications

References 11 publications

Light-mediated thresholds in stream-water nutrient composition in a river network

Light-mediated thresholds in stream-water nutrient composition in a river network

The Genus Cladophora Kützing (Ulvophyceae) as a Globally Distributed Ecological Engineer

Algal Ecology in Tailwater Stream Communities: The Colorado River Below Glen Canyon Dam, Arizona

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