Responses of Stream Periphyton and Benthic Insects to Increases in Dissolved Inorganic Phosphorus in a Mesocosm

1991 ◽  
Vol 48 (11) ◽  
pp. 2061-2072 ◽  
Author(s):  
J. H. Mundie ◽  
K. S. Simpson ◽  
C. J. Perrin
Keyword(s):  
Chlorophyll A ◽  
Inorganic Phosphorus ◽  
Size Distributions ◽  
Size Selection ◽  
Periphytic Algae ◽  
Benthic Insects ◽  
Stream Periphyton ◽  
Dissolved Inorganic Phosphorus ◽  
Emerging Insects

Responses of stream periphytic algae and benthic insects to increases in dissolved inorganic phosphorus (P) were assessed in a streamside mesocosm. Controls and treatments were colonized continuously in summer by biota from the stream. P was maintained in the treatments at 10 μg∙L−1, [Formula: see text] times the concentration in the controls. In the treatments the biomass of chlorophyll a reached 3.5 times that of the controls, accompanied by an increase in Cyanophyta relative to diatoms. No difference was detectable in the numbers of insects drifting from controls and treatments. Numbers of individuals emerging (> 40 species) from the treatments over 7 wk were 2.2 times those from the controls. In both controls and treatments, 77% or more of emerging insects were Chironomidae. After week 7 the density of benthic insects in the treatments, determined without size selection, was 1.75 times that of the controls; size distributions in treatments and controls were similar. Addition of P, therefore, increased the food of insects and resulted in a doubling of their survival to emergence.

scholarly journals Dissolved inorganic phosphorus export to the coastal zone: Results from a spatially explicit, global model

2005 ◽  
Vol 19 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
John A. Harrison ◽  
Sybil P. Seitzinger ◽  
A. F. Bouwman ◽  
Nina F. Caraco ◽  
Arthur H. W. Beusen ◽  
...  
Keyword(s):  
Coastal Zone ◽  
Inorganic Phosphorus ◽  
Global Model ◽  
Spatially Explicit ◽  
Dissolved Inorganic Phosphorus ◽  
Phosphorus Export

scholarly journals Seasonal Nearshore Occurrence of the Neurotoxin β N methylamino L alanine (BMAA) in Lake Winnipeg, Canada

2016 ◽  
Vol 5 (1) ◽  
pp. 110 ◽  
Author(s):  
Eva Pip ◽  
Kimber Munford ◽  
Lindsay Bowman
Keyword(s):  
Chlorophyll A ◽  
Nutrient Management ◽  
Management Strategies ◽  
Seasonal Fluctuation ◽  
Inverse Correlation ◽  
Water Quality Monitoring ◽  
Inorganic Phosphorus ◽  
Lake Winnipeg ◽  
Nitrate N ◽  
Shading Effects

Seasonal fluctuation patterns of the neurotoxic amino acid β N methylamino L alanine (BMAA) were examined at four-day intervals during the ice-free season in water at three nearshore stations in the south basin of Lake Winnipeg, Canada. BMAA patterns were significantly exponentially correlated with concurrent phaeophytin, and inversely with chlorophyll a, indicating that free BMAA concentrations increased as blooms declined. BMAA was also significantly related to preceding microcystin concentrations, and as chlorophyll a declined, the proportion of BMAA relative to microcystin increased. Cross correlations identified significant relationships between BMAA and immediately preceding nitrate-N/inorganic phosphorus ratios, nitrate-N, rainfall, and a marginal inverse correlation with inorganic phosphorus. Total suspended solids levels were also significantly associated with BMAA, likely due to shading effects. A very high BMAA concentration was found under collapse of intense bloom conditions. These results have implications for water quality monitoring, nutrient management strategies and public health.

Dissolved inorganic phosphorus in streams of the Indian arid zone

1985 ◽  
Vol 78 (1-2) ◽  
pp. 49-59
Author(s):  
J.S. Choudhari
Keyword(s):  
Arid Zone ◽  
Inorganic Phosphorus ◽  
Dissolved Inorganic Phosphorus

Determination of dissolved inorganic phosphorus in natural waters at nanomolar concentrations using a long capillary cell detector

1991 ◽  
Vol 244 ◽  
pp. 63-70 ◽  
Author(s):  
Franklin I. Ormaza-González ◽  
Peter J. Statham
Keyword(s):  
Natural Waters ◽  
Inorganic Phosphorus ◽  
Dissolved Inorganic Phosphorus

scholarly journals Dark accelerates dissolved inorganic phosphorus release of high-density cyanobacteria

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0243582
Author(s):  
Mengmeng Wang ◽  
Huifen Zhang ◽  
Menggaoshan Chen ◽  
Liuyan Yang ◽  
Yichen Yang
Keyword(s):  
Inorganic Phosphorus ◽  
Phosphorus Release ◽  
High Density ◽  
Freshwater Lakes ◽  
Microcosm Experiment ◽  
Release Process ◽  
Water Parameters ◽  
Degrading Bacteria ◽  
Phosphorus Source ◽  
Dissolved Inorganic Phosphorus

Bloom-forming cyanobacteria dramatically influence nutrient cycling in eutrophic freshwater lakes. The phosphorus (P) assimilation and release of bloom-forming cyanobacteria significantly may also affect the phosphorus source and amounts in water. To understand the phosphorus release process of bloom-forming cyanobacteria below the accumulated surface and sedimentary bloom-forming cyanobacteria, the degradation of bloom-forming cyanobacteria dominated by Microcystis spp. at different cell density in the dark was investigated over a 25-day microcosm experiment. The dissolved inorganic phosphorus (DIP) and dissolved total phosphorus (DTP) contents increased with the increment of cyanobacterial density, and the dark status markedly increased the proportion of DIP in water during the decline period of bloom-forming cyanobacteria. Meanwhile, the process of cyanobacterial apoptosis accompanied by the changes of malondialdehyde (MDA) and phosphatase (AKP) contents, and the increases of superoxide dismutase (SOD) and catalase (CAT) activities of cyanobacteria in the dark, especially in low-density groups (5.23×108 cells L-1), which further affect the physicochemical water parameters. Moreover, the DIP release from high-density cyanobacteria (7.86×107 cells L-1~5.23×108 cells L-1) resulted from the relative abundance of organophosphorus degrading bacteria in the dark. Therefore, the fast decay of cyanobacteria in the dark could accelerate DIP release, the high DIP release amount from accumulated bloom-cyanobacteria provide adequate P quickly for the sustained growth of cyanobacteria.

Fertilization and pH effects on processes and mechanisms controlling dissolved inorganic phosphorus in soils

2011 ◽  
Vol 75 (10) ◽  
pp. 2980-2996 ◽  
Author(s):  
Nicolas Devau ◽  
Philippe Hinsinger ◽  
Edith Le Cadre ◽  
Bruno Colomb ◽  
Frédéric Gérard
Keyword(s):  
Inorganic Phosphorus ◽  
Ph Effects ◽  
Dissolved Inorganic Phosphorus

scholarly journals Chlorophyll <i>a</i>-specific Δ<sup>14</sup>C, δ<sup>13</sup>C and δ<sup>15</sup>N values in stream periphyton: implications for aquatic food web studies

2015 ◽  
Vol 12 (22) ◽  
pp. 6781-6789 ◽  
Author(s):  
N. F. Ishikawa ◽  
M. Yamane ◽  
H. Suga ◽  
N. O. Ogawa ◽  
Y. Yokoyama ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Chlorophyll A ◽  
Dissolved Inorganic Carbon ◽  
Atmospheric Co2 ◽  
Algal Community ◽  
Web Studies ◽  
Stream Periphyton ◽  
Limestone Bedrock ◽  
Primary Producer ◽  
Aquatic Food

Abstract. Periphytic algae attached to a streambed substrate (periphyton) are an important primary producer in stream ecosystems. We determined the isotopic composition of chlorophyll a in periphyton collected from a stream flowing on limestone bedrock in the Seri River, central Japan. Stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) and natural radiocarbon abundances (Δ14C) were measured in chlorophyll a (δ13Cchl, δ15Nchl and Δ14Cchl) and bulk (δ13Cbulk, δ15Nbulk and Δ14Cbulk) for periphyton, a pure aquatic primary producer (Cladophora sp.) and a terrestrial primary producer (Quercus glauca). Periphyton δ13Cbulk and δ13Cchl values did not necessarily correspond to δ13Cbulk for an algal-grazing specialist (Epeorus latifolium). Periphyton Δ14Cchl values (−258 ‰ in April and −190 ‰ in October) were slightly lower than Δ14Cbulk values (−228 ‰ in April and −179 ‰ in October) but were close to the Δ14C value for dissolved inorganic carbon (DIC; −217 ± 31 ‰), which is a mixture of weathered carbonates (Δ14C = −1000 ‰), CO2 derived from aquatic and terrestrial organic matters (variable Δ14C) and dissolved atmospheric CO2 (Δ14C approximately +30 ‰ in 2013). Δ14Cchl values were also close to Δ14Cbulk for E. latifolium (−215 ‰ in April and −199 ‰ in October) and Cladophora sp. (−210 ‰), whereas the Δ14Cbulk value for Q. glauca (+27 ‰) was closer to Δ14C for atmospheric CO2. Although the bulk isotopic composition of periphyton is recognised as a surrogate for the photosynthetic algal community, natural periphyton is a mixture of aquatic and terrestrial organic materials. Our results indicate that the bulk periphyton matrix at the study site consists of 89 to 95 % algal carbon (derived from 14C-depleted DIC) and 5 to 11 % terrestrial organic carbon (derived from 14C-enriched atmospheric CO2).

Stream Periphyton Development in Relation to Current Velocity and Nutrients

1981 ◽  
Vol 38 (4) ◽  
pp. 449-457 ◽  
Author(s):  
R. R. Horner ◽  
E. B. Welch
Keyword(s):  
Chlorophyll A ◽  
Adenosine Triphosphate ◽  
Current Velocity ◽  
Shear Velocity ◽  
Positive Influence ◽  
Phosphorus Concentration ◽  
Chl A ◽  
Stream Periphyton ◽  
Before And After ◽  
Accrual Rate

Measurement of chlorophyll a accrual on flattened rock substrates placed in streams revealed that a velocity increase up to ~50 cm∙s−1 enhanced periphytic algae accumulation when orthophosphate-phosphorus concentration exceeded 40–50 μg∙L−1. At lower P concentrations velocity increases reduced the accrual rate. The erosive effect of current was hypothesized to retard accumulation unless nutrient availability was such that the positive influence of turbulent diffusion of dissolved substances, and consequent cell growth, overcame frictional shear. Velocity increments above 50 cm∙s−1 eroded an increasingly greater proportion of the periphyton growth. The definition and use of a heterotrophic index as the ratio of adenosine triphosphate to chl a demonstrated that current velocity increases assisted the accumulation of the attached consumers relative to that of the primary producers. Comparison of heterotrophic indices before and after elevated storm runoff currents showed smaller reductions in the standing crop of the periphytic heterotrophs than that of the autotrophs.Key words: periphyton, current velocity, nutrients, phosphorus, chlorophyll a, adenosine triphosphate, heterotrophs

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