Effects of nutrient enrichment on algal biomass across a natural light gradient

2005 ◽  
Vol 164 (4) ◽  
pp. 449-464 ◽  
Author(s):  
W. Keith Taulbee ◽  
Scott D. Cooper ◽  
John M. Melack
Keyword(s):  
Nutrient Enrichment ◽  
Algal Biomass ◽  
Natural Light ◽  
Light Gradient

Glacier melting and stoichiometric implications for lake community structure: zooplankton species distributions across a natural light gradient

2012 ◽  
Vol 19 (1) ◽  
pp. 316-326 ◽  
Author(s):  
Cecilia Laspoumaderes ◽  
Beatriz Modenutti ◽  
María Sol Souza ◽  
Marcela Bastidas Navarro ◽  
Florencia Cuassolo ◽  
...  
Keyword(s):  
Community Structure ◽  
Species Distributions ◽  
Natural Light ◽  
Zooplankton Species ◽  
Light Gradient ◽  
Glacier Melting

Periphyton biomass response to changing phosphorus concentrations in a nutrient-impacted river: a new methodology for phosphorus target setting

2007 ◽  
Vol 64 (2) ◽  
pp. 227-238 ◽  
Author(s):  
Michael J Bowes ◽  
Jim T Smith ◽  
John Hilton ◽  
Michael M Sturt ◽  
Patrick D Armitage
Keyword(s):  
Nutrient Enrichment ◽  
Algal Biomass ◽  
Algal Growth ◽  
Physical Effect ◽  
Target Setting ◽  
Knowledge Based ◽  
P Limitation ◽  
Periphyton Biomass ◽  
P Addition ◽  
Biomass Reduction

Nutrient modification experiments were conducted in streamside flumes to determine the concentration at which P limits algal growth in the mesotrophic River Frome, Dorset, UK. The soluble reactive P (SRP) concentration in each flume was either increased (by P addition), decreased (by precipitating P with iron(II) sulphate solution), or left unaltered (control), producing SRP concentrations ranging from 32 to 420 µ·L–1. Increasing the ambient SRP concentration did not increase epilithic algal growth, showing that the River Frome was not P limited at 109 µ SRP·L–1. In the P-stripped flumes, algal biomass declined as the SRP concentration fell below ~90 µ·L–1, with a 60% biomass reduction at <40 µ SRP·L–1. Phosphorus-diffusing periphytometers deployed in the P-stripped flumes confirmed that reduced rates of algal growth were due to P limitation rather than a physical effect of FeSO4 addition. The ~90 µ·L–1 maximum P-limiting concentration is likely to be similar for comparable nutrient-impacted rivers. This iron-stripping approach expands the existing river nutrient-enrichment methodology so that it can be used in nutrient-impacted rivers and should allow catchment managers to produce knowledge-based P reduction targets prior to introducing remediation.

Photosynthetic characteristic and leaf traits variations along a natural light gradient in Acer campestre and Crataegus monogyna

Flora ◽  
2020 ◽  
Vol 268 ◽  
pp. 151626
Author(s):  
Mirko U. Granata ◽  
Francesco Bracco ◽  
Paola Nola ◽  
Rosangela Catoni
Keyword(s):  
Leaf Traits ◽  
Natural Light ◽  
Acer Campestre ◽  
Crataegus Monogyna ◽  
Photosynthetic Characteristic ◽  
Light Gradient

Autotrophic Production in Carnation Creek, a Coastal Rainforest Stream on Vancouver Island, British Columbia

1976 ◽  
Vol 33 (7) ◽  
pp. 1553-1563 ◽  
Author(s):  
John G. Stockner ◽  
K. R. S. Shortreed
Keyword(s):  
Organic Matter ◽  
Nutrient Enrichment ◽  
Algal Biomass ◽  
Algal Growth ◽  
Nutrient Concentrations ◽  
Herbivorous Insects ◽  
Light Conditions ◽  
Net Production ◽  
Filamentous Green Algae ◽  
Major Loss

Attached algal growth in Carnation Creek and its estuary were monitored in 1974 and 1975 as part of the Carnation Creek Experimental Watershed Project. Net production on the estuary was 17.8 μg organic matter (org)∙cm−2∙day−1, and in Carnation Creek the average was 3.4 μg org∙cm−2∙day−1. Algal growth in Ritherdon Creek, located in an adjacent logged watershed, was slightly higher (4.6 μg org∙cm−2∙day−1) than the Carnation Creek average. In a streamside nutrient enrichment experiment, nitrate and phosphate concentrations in one trough were increased to twice the normal Carnation Creek values present in the control. In 35 days the nutrient-enriched trough had a total algal volume 3 times that of the control. It is suggested that extremely low nutrient concentrations (especially phosphate), and secondarily, poor light conditions under the canopy, are responsible for the paucity of algal growth in Carnation Creek. Major loss of algae from the system is caused by periodic freshets which scour the stream bed. Losses by grazing herbivorous insects were considered negligible. Dominant diatoms in Carnation Creek were Achnanthes minutissima, Synedra ulna, Hannaea arcus, Diatoma hiemale, and Eunotia pectinalis. Ulothrix sp., Draparnaldia sp., and Mougeotia sp. were the dominant filamentous green algae. Net production and algal biomass (chlorophyll a) in Carnation Creek are among the lowest ever reported in the literature.

scholarly journals Seasonal changes in the physiological activity of regeneration under a natural light gradient in a Pinus pinea regular stand

2010 ◽  
Vol 19 (3) ◽  
pp. 367 ◽  
Author(s):  
Marta Pardos ◽  
Jaim Puértolas ◽  
Guillermo Madrigal ◽  
Enrique Garriga ◽  
Santiago De Blas ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Physiological Activity ◽  
Pinus Pinea ◽  
Natural Light ◽  
Light Gradient
Sign in / Sign up

Export Citation Format

Share Document