Underwater Spectral Attenuation and Its Effect on the Maximum Depth of Angiosperm Colonization

1988 ◽  
Vol 45 (6) ◽  
pp. 1010-1017 ◽  
Author(s):  
P. A. Chambers ◽  
E. E. Prepas
Keyword(s):  
Light Quality ◽  
Secchi Depth ◽  
Maximum Depth ◽  
Regression Equations ◽  
Light Spectrum ◽  
Temperate Lakes ◽  
Underwater Light ◽  
Spectral Attenuation ◽  
Light Quantity ◽  
North Temperate Lakes

Data collected from 23 Alberta lakes and literature values for 45 other north temperate lakes were used to develop regression models to evaluate the effect of underwater light quality on the maximum depth of angiosperm colonization. Unlike most north temperate lakes, eutrophic Alberta lakes have unusually low levels of dissolved colour and, as a result, transmit blue light particularly well. Comparison of regression equations relating the maximum depth of angiosperm colonization (zc) and Secchi depth (D) for lakes with low colour [Formula: see text] and with high colour [Formula: see text] showed that for any Secchi depth, aquatic angiosperms colonized to greater depths in lakes with low colour. These results demonstrate that light quality as well as light quantity determine the maximum depth of angiosperm colonization in lakes. Regional differences in the relation between zc and Secchi depth may therefore be due to variations in the underwater light spectrum.

Regional climatic drivers of synchronous zooplankton dynamics in north-temperate lakes

2008 ◽  
Vol 65 (5) ◽  
pp. 878-889 ◽  
Author(s):  
James A Rusak ◽  
Norman D Yan ◽  
Keith M Somers
Keyword(s):  
Temporal Dynamics ◽  
Southern Oscillation ◽  
Secchi Depth ◽  
Ice Cover ◽  
Temperate Lakes ◽  
Spring Temperature ◽  
Enso Events ◽  
Temperature And Precipitation ◽  
Zooplankton Dynamics ◽  
North Temperate Lakes

The role that climate plays in determining the temporal dynamics of freshwater zooplankton is poorly understood, despite its potential to synchronize population dynamics on a regional basis. We quantify the spatial synchrony of common zooplankton taxa among lakes in the Dorset, Ontario, area and investigate the climatic mechanisms responsible for these patterns at both annual and seasonal scales. We show that the dynamics of several taxa are characterized by similar patterns of abundance among lakes across the region, suggesting a synchronising effect of climate on zooplankton population abundances. Using multiple regression analyses to compare zooplankton dynamics with climatic and in-lake variables, we find that El Niño – Southern Oscillation (ENSO) events and ice cover variability are among the most important predictors of synchrony at annual and seasonal scales, particularly for Leptodiaptomus and Bosmina. Leptodiaptomus, a dominant herbivore in these lakes, had decreased abundances in years with earlier ice-off dates and shorter periods of ice cover. Secchi depth was also synchronous and appeared to respond to regional meteorological factors (spring temperature and precipitation, ice duration). A warming climate with the ability to modify ice and ENSO dynamics, as well as temperature and precipitation patterns, may also alter the structure and dynamics of zooplankton communities in north-temperate lakes.

scholarly journals Production and quality of strawberry cultivated under different colors of low tunnel cover

2017 ◽  
Vol 35 (3) ◽  
pp. 364-370 ◽  
Author(s):  
Juliane M Henschel ◽  
Juliano TV Resende ◽  
Patrícia C Giloni-Lima ◽  
André R Zeist ◽  
Renato B Lima Filho ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Light Quality ◽  
Specific Response ◽  
Light Spectrum ◽  
Vegetative Traits ◽  
Low Tunnels ◽  
Social Importance ◽  
Physiological And Biochemical ◽  
Lower Production

ABSTRACT Strawberry is a crop of great economic and social importance. Its fruits are appreciated both for their flavor and nutraceutical potential. Some studies confirm that light quality influences plant physiology. Thus, the aim of this study was to investigate if changes in light spectrum, provided by low tunnels, can improve vegetative traits, as well as, production and fruit quality of strawberry. The authors used six tunnel covers (red, yellow, blue, green, transparent and opaque and one control, without cover), and two cultivars: a short photoperiod cultivar (Camarosa) and a neutral photoperiod cultivar (Albion). Experiment was evaluated in two seasons: production and plant development first; and then, post-harvest quality. Overall, Camarosa showed higher vegetative growth, lower production, and better fruit quality than Albion. Due to the complexity of physiological and biochemical responses, each trait evaluated showed a specific response to light changes. The red, blue, yellow and green covers did not show any significant improvement comparing with transparent and opaque covers. Thus, the authors suggest the use of the latter ones which have already been used commercially.

Multiscale drivers of phytoplankton communities in north‐temperate lakes

2020 ◽  
Vol 30 (5) ◽  
Author(s):  
Charlie J. G. Loewen ◽  
Faye R. Wyatt ◽  
Colleen A. Mortimer ◽  
Rolf D. Vinebrooke ◽  
Ron W. Zurawell
Keyword(s):  
Temperate Lakes ◽  
Phytoplankton Communities ◽  
North Temperate Lakes

The effect of dreissenid invasions on chlorophyll and the chlorophyll : total phosphorus ratio in north-temperate lakes

2011 ◽  
Vol 68 (2) ◽  
pp. 319-329 ◽  
Author(s):  
S. N. Higgins ◽  
M. J. Vander Zanden ◽  
L. N. Joppa ◽  
Y. Vadeboncoeur
Keyword(s):  
Total Phosphorus ◽  
Dreissena Polymorpha ◽  
Trophic Status ◽  
Hierarchical Modeling ◽  
Significant Decline ◽  
Analysis Of Covariance ◽  
Temperate Lakes ◽  
Regression Approach ◽  
North Temperate Lakes ◽  
Lake Size

We investigated the effects of dreissenid mussel ( Dreissena polymorpha and D. rostriformis bugensis ) invasions on the concentrations of chlorophyll a (Chl) and total phosphorus(TP), and the Chl:TP ratio within 27 north-temperate lakes that spanned large gradients in lake size and trophic status, using two approaches: (i) regression analysis and (ii) hierarchical modeling. Overall, Chl declined by 40%–45% after dreissenid invasion and the magnitude of effect was structured by epilimnetic volume within stratified, but not nonstratified (mixed) lakes. Declines in TP over the invasion period were significant only for stratified systems and were smaller (∼16% reduction from pre-invasion values) than for Chl. Across the complete trophic gradient (i.e., among lakes) the regression approach (analysis of covariance) indicated a significant decline in the intercept of the Chl:TP, but not the slope. In contrast, hierarchical modeling indicated a decline in the slope of Chl:TP among lakes between pre- and post-invasion periods. As with Chl, the effect of dreissenids on Chl:TP declined with increases in epilimnetic volume in stratified, but not nonstratified lakes. Dreissenid effects on Chl were prolonged, with no indication of diminishing within 7–10 years of invasion.

Potential effects of global climate change on small north-temperate lakes: Physics, fish, and plankton

1996 ◽  
Vol 41 (5) ◽  
pp. 1136-1149 ◽  
Author(s):  
Bart T. De Stasio ◽  
David K. Hill ◽  
Julie M. Kleinhans ◽  
Nathan P. Nibbelink ◽  
John J. Magnuson
Keyword(s):  
Climate Change ◽  
Global Climate Change ◽  
Global Climate ◽  
Temperate Lakes ◽  
North Temperate Lakes

Natural and Human Influences on Fish Species Richness in Small North Temperate Lakes: Implications for Bioassessment

2009 ◽  
Vol 24 (1) ◽  
pp. 7-18 ◽  
Author(s):  
Martin J. Jennings ◽  
Gene R. Hatzenbeler ◽  
Michael A. Bozek ◽  
Clayton Edwards
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Temperate Lakes ◽  
North Temperate Lakes

scholarly journals Spatial heterogeneity strongly affects estimates of ecosystem metabolism in two north temperate lakes

2012 ◽  
Vol 57 (6) ◽  
pp. 1689-1700 ◽  
Author(s):  
Matthew C. Van de Bogert ◽  
Darren L. Bade ◽  
Stephen R. Carpenter ◽  
Jonathan J. Cole ◽  
Michael L. Pace ◽  
...  
Keyword(s):  
Spatial Heterogeneity ◽  
Ecosystem Metabolism ◽  
Temperate Lakes ◽  
North Temperate Lakes
Sign in / Sign up

Export Citation Format

Share Document