Chlorophyll Fluorescence Measures of Emerged Hippuris vulgaris

2014 ◽  
Vol 1073-1076 ◽  
pp. 1108-1111
Author(s):  
Lin An Gao
Keyword(s):  
Electron Transport ◽  
Water Temperature ◽  
Photosynthetic Activity ◽  
High Water ◽  
Diurnal Changes ◽  
Light Cycle ◽  
Pam Fluorometry ◽  
Electron Transport Rates ◽  
Hippuris Vulgaris ◽  
The Relationship

We used PAM fluorometry to examine photosynthetic rates of emergedHippuris vulgarisin two lakes characterized by different water temperature conditions. The photosynthetic response of emergedHippuris vulgariswas measured every 2 h throughout daily light cycle from dawn (7 am) to dusk (17 pm). Diurnal changes in the pattern of rapid-light curves (RLCs) were investigated in the field under ambient daylight. Electron transport rates were always significantly higher for emergedHippuris vulgarisin Five Colored Lake than that for plants in Arrow Bamboo Lake. Moreover, emergedHippuris vulgarisin Five Colored Lake had higher light saturation. Such a finding suggests higher photosynthetic activity in Five Colored Lake possibly in response to high water temperature. The relationship between the electron transport rates and temperature suggests that this species is strongly temperature -limited.

Photosynthetic Performance of Marestail (Hippuris vulgaris Linn.) across a Water Temperature Gradient

2014 ◽  
Vol 1010-1012 ◽  
pp. 1165-1169
Author(s):  
Lin An Gao
Keyword(s):  
Water Temperature ◽  
Photosynthetic Activity ◽  
Pulse Amplitude ◽  
High Water ◽  
Photosynthetic Performance ◽  
Light Curves ◽  
Pam Fluorometry ◽  
Photosynthetic Responses ◽  
Hippuris Vulgaris

we examined the photosynthetic responses of submerged marestail in three lakes using pulse amplitude modulated (PAM) fluorometry. Three lakes were studied across a gradient of water temperature, with low water temperature conditions in Grass Lake and Arrow Bamboo Lake, and higher water temperature in Five Colored Lake. In the field, electron transport rates (ETRmax) were measured as rapid light curves (RLCs) by in situ yield measurements. Submerged marestail showed higher photosynthetic activity in Five Colored Lake compared to the other lakes, a response consistent with the adaptation of marestail in Five Colored Lake to high water temperature. The optimal temperature for photosynthesis of submerged marestail in Jiuzhaigou is about 12 °C. These results indicate that in different lakes the function of these aquatic plants is associated with a diversity of place-dependent environmental conditions, especially water temperature that leads to pronounced differences in the plant’s ecophysiological reactions.

scholarly journals Long-term relationship between air and water temperatures in Lake Paldang, South Korea

2020 ◽  
Vol 26 (4) ◽  
pp. 200177-0
Author(s):  
Soon Ju Yu ◽  
In Gu Ryu ◽  
Min Ji Park ◽  
Jong Kwon Im
Keyword(s):  
Elevated Temperature ◽  
Numerical Model ◽  
South Korea ◽  
Water Temperature ◽  
Air Temperature ◽  
Water Source ◽  
High Water ◽  
Temperature Hysteresis ◽  
The Relationship

A long-term investigation into the relationship between air and water temperatures was conducted in Lake Paldang, which is the largest water source in South Korea, by studying hysteresis. From 1973 to 2018, the annual mean air temperature increased by 0.05°C/yr (seasonal Sen’s slope). The results of a numerical model (R > 0.86) showed that the ratios of the air and water temperatures increased (0.71‒0.77) in the rising limb and decreased (0.70‒0.76) in the falling limb. However, the intercept values were 0.13–3.52 and 6.62–7.78 in the rising and falling limbs, respectively, and hence there was a 4–5°C increase in temperature. In particular, in 2015, 2016, and 2018, the intercept values in the falling limb were ≥ 7, exhibiting hysteresis, whereby high water temperatures were slow to decline. Lake Paldang showed stronger water temperature hysteresis than its influent rivers and stream. The rising and falling limbs did not show a large difference in the extent of water temperature change (slope). However, the water temperature did not decrease rapidly, and the decrease continued for longer due to hysteresis, which is a type of inertia where the elevated temperature persists if the summer air temperature is significantly increased.

The Relationship between Concentration and Sensory Properties of 2-Methylisoborneol and Geosmin in Drinking Water

1988 ◽  
Vol 20 (8-9) ◽  
pp. 11-17 ◽  
Author(s):  
T. Ito ◽  
T. Okumura ◽  
M. Yamamoto
Keyword(s):  
Drinking Water ◽  
Water Temperature ◽  
Forced Choice ◽  
Residual Chlorine ◽  
Mixing Ratio ◽  
Consumer Panel ◽  
Triangle Method ◽  
Musty Odor ◽  
The Relationship ◽  
Mixed Samples

The study of the relations between the senses of smell and taste and odorant concentration is important for the solution of odor problems. The threshold concentrations of odor and taste (TOC, TTC) of 2-methylisoborneol (MIB) and geosmin were measured by the non-forced choice triangle method using 12-20 panelists. Both TOC and TTC were found to be functions of water temperature and the concentration of residual chlorine. The TOC and TTC of mixed samples were rather lower than the concentrations calculated from the mixing ratio. The sensitivities of the consumer panel and the number of musty odor complaints from consumers are related to MIB or geosmin concentration. The ratio of the number of complaints to MIB (or geosmin) concentration decreased after maximum complaint, but the sensitivity of the consumer panel remained the same.

Electron transport in Tradescantia leaves acclimated to high and low light: thermoluminescence, PAM-fluorometry, and EPR studies

2020 ◽  
Vol 146 (1-3) ◽  
pp. 123-141
Author(s):  
Olesya A. Kalmatskaya ◽  
Boris V. Trubitsin ◽  
Igor S. Suslichenko ◽  
Vladimir A. Karavaev ◽  
Alexander N. Tikhonov
Keyword(s):  
Electron Transport ◽  
Pam Fluorometry ◽  
Low Light

Estimating the influence of temperature on the survival of chinook salmon smolts (Oncorhynchus tshawytscha) migrating through the Sacramento – San Joaquin River Delta of California

1995 ◽  
Vol 52 (4) ◽  
pp. 855-863 ◽  
Author(s):  
Peter Fritz Baker ◽  
Franklin K. Ligon ◽  
Terence P. Speed
Keyword(s):  
Water Temperature ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Logistic Function ◽  
Laboratory Findings ◽  
Natural Systems ◽  
San Joaquin River ◽  
Influence Of Temperature On ◽  
The Relationship ◽  
Good Agreement

Data from the U.S. Fish and Wildlife Service are used to investigate the relationship between water temperature and survival of hatchery-raised fall-run chinook salmon (Oncorhynchus tshawytscha) smolts migrating through the Sacramento – San Joaquin Delta of California. A formal statistical model is presented for the release of smolts marked with coded-wire tags (CWTs) in the lower Sacramento River and the subsequent recovery of marked smolts in midwater trawls in the Delta. This model treats survival as a logistic function of water temperature, and the release and recovery of different CWT groups as independent mark–recapture experiments. Iteratively reweighted least squares is used to fit the model to the data, and simulation is used to establish confidence intervals for the fitted parameters. A 95% confidence interval for the upper incipient lethal temperature, inferred from the trawl data by this method, is 23.01 ± 1.08 °C This is in good agreement with published experimental results obtained under controlled conditions (24.3 ± 0.1 and 25.1 ± 0.1 °C for chinook salmon acclimatized to 10 and 20 °C, respectively): this agreement has implications for the applicability of laboratory findings to natural systems.

Sign in / Sign up

Export Citation Format

Share Document