Short-Term Temperature Stress Results in Seagrass Community Shift in a Temperate Estuary

2019 ◽  
Vol 42 (3) ◽  
pp. 755-764 ◽  
Author(s):  
Erin C. Shields ◽  
Dave Parrish ◽  
Kenneth Moore
Keyword(s):  
Temperature Stress ◽  
Short Term ◽  
Temperate Estuary ◽  
Community Shift ◽  
Seagrass Community

scholarly journals An Unexpectedly Broad Thermal and Salinity-Tolerant Estuarine Methanogen Community

2020 ◽  
Vol 8 (10) ◽  
pp. 1467
Author(s):  
Lynsay I. Blake ◽  
Angela Sherry ◽  
Obioma K. Mejeha ◽  
Peter Leary ◽  
Henry Coombs ◽  
...  
Keyword(s):  
High Temperature ◽  
Short Term ◽  
Moderately Thermophilic ◽  
Microbial Function ◽  
Optimal Activity ◽  
Temperate Estuary ◽  
Methanogen Community ◽  
Estuary Sediment ◽  
Global Activity

Moderately thermophilic (Tmax, ~55 °C) methanogens are identified after extended enrichments from temperate, tropical and low-temperature environments. However, thermophilic methanogens with higher growth temperatures (Topt ≥ 60 °C) are only reported from high-temperature environments. A microcosm-based approach was used to measure the rate of methane production and methanogen community structure over a range of temperatures and salinities in sediment from a temperate estuary. We report short-term incubations (<48 h) revealing methanogens with optimal activity reaching 70 °C in a temperate estuary sediment (in situ temperature 4–5 °C). While 30 °C enrichments amended with acetate, H2 or methanol selected for corresponding mesophilic trophic groups, at 60 °C, only hydrogenotrophs (genus Methanothermobacter) were observed. Since these methanogens are not known to be active under in situ temperatures, we conclude constant dispersal from high temperature habitats. The likely provenance of the thermophilic methanogens was studied by enrichments covering a range of temperatures and salinities. These enrichments indicated that the estuarine sediment hosted methanogens encompassing the global activity envelope of most cultured species. We suggest that estuaries are fascinating sink and source environments for microbial function study.

On the temperature and voltage dependence of short-term negative bias temperature stress

2009 ◽  
Vol 49 (9-11) ◽  
pp. 1013-1017 ◽  
Author(s):  
Ph. Hehenberger ◽  
P.-J. Wagner ◽  
H. Reisinger ◽  
T. Grasser
Keyword(s):  
Temperature Stress ◽  
Voltage Dependence ◽  
Negative Bias ◽  
Short Term ◽  
Bias Temperature Stress

scholarly journals Short-term Cyclic Cold Temperature Stress on Watermelon Yield

HortScience ◽  
2002 ◽  
Vol 37 (3) ◽  
pp. 487-489 ◽  
Author(s):  
Ahmet Korkmaz ◽  
Robert J. Dufault
Keyword(s):  
Cold Stress ◽  
Temperature Stress ◽  
Citrullus Lanatus ◽  
Cold Temperature ◽  
Yield Reduction ◽  
Short Term

Watermelon [Citrullus lanatus (Thunb) Matsum. & Nakai.] seedlings may be repeatedly exposed to temperatures alternating between almost freezing and optimum soon after field transplanting. `Carnival', `Crimson Sweet', `Millionaire' and `Crimson Trio' watermelon transplants were exposed to cold temperature stress at 2 ± 1 °C in a walk-in cooler and then to 29 ± 5 °C in a greenhouse immediately before field planting to simulate temperature alternations that may occur after field transplanting. Cold-stressed transplants were field planted after all risk of ambient cold stress passed. In 1998, transplants were exposed to 2 °C from 9 hours to 54 hours, and in 1999 from 9 to 81 hours. Early yields of all cultivars, except Carnival, significantly decreased with increasing hours of cold stress in both years. Total yields of `Carnival' decreased linearly in both years with a 10% yield reduction occurring from 14 to 15 hours of cold stress. `Crimson Sweet' yields were reduced in 1999 only, with 16 hours of cold stress reducing yield 10%.

scholarly journals Effects of Different Ambient Temperatures on Caecal Microbial Composition in Broilers

2021 ◽  
Vol 70 (1) ◽  
Author(s):  
YUTING YANG ◽  
XING LI ◽  
ZHENHUI CAO ◽  
YINGING QIAO ◽  
QIUYE LIN ◽  
...  
Keyword(s):  
Temperature Stress ◽  
Short Term ◽  
Microbial Composition ◽  
Ambient Temperatures ◽  
Cellular Processes ◽  
Stress Biomarkers ◽  
Tnf Α ◽  
Shock Proteins ◽  
Environmental Information Processing

Short-term or acute temperature stress affect the immune responses and alters the gut microbiota of broilers, but the influences of long-term temperature stress on stress biomarkers and the intestinal microbiota remains largely unknown. Therefore, we examined the effect of three long-term ambient temperatures (high (HC), medium (MC), and low (LC) temperature groups) on the gene expression of broilers’ heat shock proteins (Hsps) and inflammation – related genes, as well as the caecal microbial composition. The results revealed that Hsp70 and Hsp90 levels in HC group significantly increased, and levels of Hsp70, Hsp90, IL-6, TNF-α, and NFKB1 in LC group were significantly higher than in MC group (p < 0.05). In comparison with the MC group, the proportion of Firmicutes increased in HC and LC groups, while that of Bacteroidetes decreased in LC group at phylum level (p < 0.05). At genus level, the proportion of Escherichia/Shigella, Phascolarctobacterium, Parabacteroides, and Enterococcus increased in HC group; the fraction of Faecalibacterium was higher in LC group; and the percentage of Barnesiella and Alistipes decreased in both HC and LC groups (p < 0.05). Functional analysis based on communities’ phylogenetic investigation revealed that the pathways involved in environmental information processing and metabolism were enriched in the HC group. Those involved in cellular processes and signaling, metabolism, and gene regulation were enriched in LC group. Hence, we conclude that the long-term temperature stress can greatly alter the intestinal microbial communities in broilers and may further affect the host’s immunity and health.

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