scholarly journals Effects of Environmental Factors on the Temporal Stability of Phytoplankton Biomass in a Eutrophic Man-Made Lake

Water ◽  
2016 ◽  
Vol 8 (12) ◽  
pp. 582 ◽  
Author(s):  
Wang Tian ◽  
Huayong Zhang ◽  
Lei Zhao ◽  
Yuanwu Xiong ◽  
Hai Huang
Keyword(s):  
Environmental Factors ◽  
Phytoplankton Biomass ◽  
Temporal Stability

Phytoplankton biomass and environmental factors over a gradient of clear to turbid peri-urban ponds

2007 ◽  
Vol 17 (6) ◽  
pp. 584-601 ◽  
Author(s):  
Anatoly Peretyatko ◽  
Samuel Teissier ◽  
Jean-Jacques Symoens ◽  
Ludwig Triest
Keyword(s):  
Environmental Factors ◽  
Phytoplankton Biomass ◽  
Urban Ponds

scholarly journals Estimating the stability of heartbeat counting in middle childhood: a twin study

2019 ◽  
Author(s):  
Jennifer Murphy ◽  
Rosa Cheesman ◽  
Alice M Gregory ◽  
Jennifer Lau ◽  
Anke Ehlers ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Middle Childhood ◽  
Internal State ◽  
Environmental Influences ◽  
Temporal Stability ◽  
Time Frame ◽  
Genetic Influences ◽  
Future Research ◽  
Counting Task ◽  
The Stability

There is growing interest in interoception, the perception of the body’s internal state, and its relevance for health and higher-order cognition across development. To date, most evidence linking interoception to health and cognition has used the heartbeat counting task. However, the stability of the measure across time, particularly during childhood, and the etiological factors that underlie individual differences in stability remain largely unexamined. Using data from the ECHO twin sample (N=204 twin pairs), we estimated the magnitude of genetic and environmental influences on the stability of heartbeat counting across a two-year period (8-10 years), the longest time-frame examined. We found a relatively modest correlation between heartbeat counting accuracy across time (r=.35), with accuracy on the heartbeat counting task improving with age. In our longitudinal twin analysis, we found that the heritability of heartbeat counting dropped between Time 1 and Time 2 from 30% to 6%. No new genetic influences were observed at Time 2, suggesting that genetic influences across this age-range are entirely stable. In contrast, shared environmental influences increased from 6% to 22%, with most of the influence at Time 2 due to new environmental factors. Of note, nonshared environmental factors accounted for the greatest proportion of variance at both time points, 64% and 73% respectively, and were the main contributors to temporal stability in heartbeat counting accuracy. Future research should seek to identify these non-shared environmental factors and elucidate whether this relatively modest stability reflects variability of interoception across development or unreliability of the heartbeat counting task.

scholarly journals The Temporal Stability of In-Group Favoritism Is Mostly Attributable to Genetic Factors

2017 ◽  
Vol 8 (8) ◽  
pp. 897-903 ◽  
Author(s):  
Gary J. Lewis ◽  
Timothy C. Bates
Keyword(s):  
Environmental Factors ◽  
Rank Order ◽  
Environmental Influences ◽  
Temporal Stability ◽  
Genetic Influences ◽  
Twin Design ◽  
Cross Sectional ◽  
Psychological Traits ◽  
Genetic And Environmental Factors ◽  
The Stability

Twin studies of in-group favoritism have reported roughly equal influences of genetic and environmental factors. All, however, have solely relied on cross-sectional approaches, leaving open the question of whether genetic and environmental factors have similar roles on stability and change for in-group favoritism across time. While in-group favoritism is commonly perceived to reflect environmental influences, stable environmental effects are rare for psychological traits, thus suggesting that genetic influences may play the major role in the stability of favoritism. Here, we used addressed this issue using a 10-year (two waves) longitudinal twin design. In-group favoritism showed high rank-order stability ( r = .67). Seventy four percent of this rank-order stability was attributable to genes. A broadly similar pattern was observed for race, ethnic, and religious favoritism. By contrast, changes in favoritism almost entirely reflected nonshared environmental influences. These findings indicate that environmental influences underpin change in favoritism, while the stability of favoritism mostly reflects genetic influences.

scholarly journals Detection of Microcystin-Producing Cyanobacteria in Finnish Lakes with Genus-Specific Microcystin Synthetase Gene E (mcyE) PCR and Associations with Environmental Factors

2006 ◽  
Vol 72 (9) ◽  
pp. 6101-6110 ◽  
Author(s):  
Anne Rantala ◽  
Pirjo Rajaniemi-Wacklin ◽  
Christina Lyra ◽  
Liisa Lepist� ◽  
Jukka Rintala ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Correlation Analysis ◽  
Total Nitrogen ◽  
Phytoplankton Biomass ◽  
Trophic Status ◽  
Regression Analyses ◽  
Occurrence Probability ◽  
Microcystin Synthetase ◽  
Bloom Formation ◽  
Toxic Bloom

ABSTRACT We studied the frequency and composition of potential microcystin (MC) producers in 70 Finnish lakes with general and genus-specific microcystin synthetase gene E (mcyE) PCR. Potential MC-producing Microcystis, Planktothrixand Anabaena spp. existed in 70%, 63%, and 37% of the lake samples, respectively. Approximately two-thirds of the lake samples contained one or two potential MC producers, while all three genera existed in 24% of the samples. In oligotrophic lakes, the occurrence of only one MC producer was most common. The combination of Microcystis and Planktothrix was slightly more prevalent than others in mesotrophic lakes, and the cooccurrence of all three MC producers was most widespread in both eutrophic and hypertrophic lakes. The proportion of the three-producer lakes increased with the trophic status of the lakes. In correlation analysis, the presence of multiple MC-producing genera was associated with higher cyanobacterial and phytoplankton biomass, pH, chlorophyll a, total nitrogen, and MC concentrations. Total nitrogen, pH, and the surface area of the lake predicted the occurrence probability of mcyE genes, whereas total phosphorus alone accounted for MC concentrations in the samples by logistic and linear regression analyses. In conclusion, the results suggested that eutrophication increased the cooccurrence of potentially MC-producing cyanobacterial genera, raising the risk of toxic-bloom formation.

Phytoplankton Biomass Related to Environmental Factors in the Ross Sea

2000 ◽  
pp. 217-230 ◽  
Author(s):  
M. Innamorati ◽  
G. Mori ◽  
L. Massi ◽  
L. Lazzara ◽  
C. Nuccio
Keyword(s):  
Environmental Factors ◽  
Phytoplankton Biomass ◽  
Ross Sea

Responses of Zooplankton Community to Environmental Factors and Phytoplankton Biomass in Lake Nansihu, China

2017 ◽  
Vol 49 (2) ◽  
pp. 461-470 ◽  
Author(s):  
Wang Tian ◽  
Huayong Zhang ◽  
Jian Zhang ◽  
Lei Zhao ◽  
Mingsheng Miao ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Phytoplankton Biomass ◽  
Zooplankton Community
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