Growth, Production, and Community Composition of Fishes Inhabiting a First‐, Second‐, and Third‐Order Stream of Eastern Kentucky

1973 ◽  
Vol 43 (3) ◽  
pp. 377-397 ◽  
Author(s):  
Victor A. Lotrich
Keyword(s):  
Community Composition ◽  
Third Order ◽  
Order Stream ◽  
Eastern Kentucky ◽  
Growth Production

Retention and Transport of Nutrients in a Third-Order Stream: Channel Processes

Ecology ◽  
1989 ◽  
Vol 70 (6) ◽  
pp. 1877-1892 ◽  
Author(s):  
Frank J. Triska ◽  
Vance C. Kennedy ◽  
Ronald J. Avanzino ◽  
Gary W. Zellweger ◽  
Kenneth E. Bencala
Keyword(s):  
Stream Channel ◽  
Channel Processes ◽  
Third Order ◽  
Order Stream

In Situ Retention-Transport Response to Nitrate Loading and Storm Discharge in a Third-Order Stream

1990 ◽  
Vol 9 (3) ◽  
pp. 229-239 ◽  
Author(s):  
Frank J. Triska ◽  
Vance C. Kennedy ◽  
Ronald J. Avanzino ◽  
Gary W. Zellweger ◽  
Kenneth E. Bencala
Keyword(s):  
Third Order ◽  
Order Stream ◽  
Transport Response

scholarly journals Predictive Modeling and Validation on Growth, Production of Asexual Spores and Ochratoxin A of Aspergillus Ochraceus Group under Abiotic Climatic Variables

2021 ◽  
Vol 9 (6) ◽  
pp. 1321
Author(s):  
Ahmed Abdel-Hadi ◽  
Bader Alshehri ◽  
Mohammed Waly ◽  
Mohammed Aboamer ◽  
Saeed Banawas ◽  
...  
Keyword(s):  
Ochratoxin A ◽  
Polynomial Regression ◽  
Fungal Growth ◽  
Climatic Variables ◽  
Aspergillus Ochraceus ◽  
Activity Levels ◽  
Third Order ◽  
The Third ◽  
Group A ◽  
Growth Production

This study aimed to generate predictive models for growth, sporulation, and ochratoxin A (OTA) production under abiotic climatic variables, including temperatures (15–35 °C) and water activity levels (0.99–0.90 aw) by Aspergillus ochraceus group. The data were divided into three sets: one for training, one for testing, and the third one for model validation. Optimum growth occurred at 0.95 aw and 25 °C and 0.95 aw and 30 °C for A. westerdijkiae and A. steynii, respectively. Significantly improved A. westerdijkiae and A. steynii spore production occurred at 0.95 aw and 20 °C and 0.90 aw and 35 °C, respectively. A. steynii and A. westerdijkiae produced the majority of OTA at 35 °C and 0.95 aw and 25–30 °C at 0.95–0.99 aw, respectively. The accuracy of the third-order polynomial regression model reached 96% in growth cases, 94.7% in sporulation cases, and 90.9% in OTA production cases; the regression coefficients (R2) ranged from 0.8819 to 0.9978 for the Aspergillus ochraceus group. A reliable agreement was reached between the predicted and observed growth, sporulation, and OTA production. The effects of abiotic climatic variables on growth, sporulation, and OTA production of A. ochraceus group have been effectively defined, and the models generated were responsible for adequately predicted and validated models against data from other strains within A. ochraceus group that had been published in the literature under the current treatments. These models could be successfully implemented to predict fungal growth and OTA contamination on food matrices for these strains under these conditions.

scholarly journals Desempenho de cultivares de mamona no Semiárido paraibano: componentes de crescimento e teor de óleo

2015 ◽  
Vol 10 (5) ◽  
pp. 127
Author(s):  
R. R. A. Lacerda ◽  
A. S. Souza ◽  
G. F. Frutado ◽  
I. S. Queiroga ◽  
W. A. Lacerda
Keyword(s):  
Experimental Design ◽  
Castor Bean ◽  
Oil Content ◽  
Precision Farming ◽  
The Other ◽  
Raw Material ◽  
Production Yield ◽  
Third Order ◽  
The Third ◽  
Growth Production

<p>A cultura da mamona vem despontando como uma das principais matérias-primas, para produção de óleo, especialmente no Nordeste, todavia muitos fatores têm dificultado o estabelecimento dessa lavoura em novas áreas dentre os quais destacam-se a falta de cultivares adaptadas a cada região de cultivo. O presente estudo foi desenvolvido com o objetivo de identificar cultivares de mamona com adaptação ao sertão paraibano. O trabalho foi conduzido no Sítio Monte Alegre zona rural do município de Pombal - PB, o delineamento experimental foi em blocos ao acaso com sete tratamentos compostos pelos cultivares BRS Nordestina; BRS Paraguaçu; BRS Energia; AL Guarany-2002; IAC 2028; IAC Guarany e IAC 80, com quatro repetições, foram avaliadas as características de crescimento e teor de óleo nas sementes. Dos resultados registrou-se maior valor de comprimento do racemo as cultivares IAC 80 e IAC 2028, considerando as médias dos racemos até a 3ª ordem, para as características de massa e número de frutos por racemos foi constatado que a IAC 80 superou estatisticamente as demais cultivares, o maior teor de óleo nas sementes foi observado na cultivar BRS Energia que também conferiu maior rendimento de óleo entre as sete cultivares. Apesar disso, acredita-se que novos estudos devem ser realizados em diferentes épocas e formas de manejo para se identificar com maior precisão qual cultivar melhor se adapta a região.</p><p><strong><em>Performance cultivars castor bean cultivars in Semiarid Paraiba: components of growth and oil content</em></strong></p><p><strong>Abstract</strong><strong>: </strong>Currently the culture of castor has emerged as a of the main raw material for the production of oil, especially in the Northeast, however many factors has hampered the establishment of this tilth in new areas among which is the lack of cultivars adapted to each region of cultivation. This study was developed with the objective of identify castor’s cultivars with adaptation to the Paraíba Sertão. The study was conducted on Sítio Monte Alegre countryside of municipality of Pombal - PB, the experimental design was the of random blocks with seven treatments composed by BRS Northeastern; Paraguaçu BRS; BRS Energy; Guarany AL-2002, IAC 2028, IAC Guarany and IAC 80, with four replications were evaluated characteristics of growth, production, yield and oil content in the seeds. From the results was registrated a higher From the results recorded was greater value of the length of cluster IAC 80 and IAC cultivars in 2028, considering the averages of racemes up to the third order, the characteristics of mass and number of fruits per raceme was found that 80 IAC statistically outperformed the other cultivars, the higher oil content in seeds was observed in BRS Energy also gave higher oil yield among the seven cultivars. Nevertheless, we believe that further studies should be performedat different times and forms of management to identify with greater precision farming which best fits the region.<strong></strong></p>

Microbiological water quality of a temperate third-order stream

2019 ◽  
Vol 30 (2) ◽  
pp. 417-426 ◽  
Author(s):  
Maria Soledad Rodriguez ◽  
Melina Celeste Crettaz-Minaglia ◽  
Diamela Gianello ◽  
Mercedes Piaggio
Keyword(s):  
Water Quality ◽  
Third Order ◽  
Order Stream ◽  
Microbiological Water Quality

Retention and Transport of Nutrients in a Third-Order Stream in Northwestern California: Hyporheic Processes

Ecology ◽  
1989 ◽  
Vol 70 (6) ◽  
pp. 1893-1905 ◽  
Author(s):  
Frank J. Triska ◽  
Vance C. Kennedy ◽  
Ronald J. Avanzino ◽  
Gary W. Zellweger ◽  
Kenneth E. Bencala
Keyword(s):  
Third Order ◽  
Order Stream

scholarly journals Rapid and Stable Microbial Community Assembly in the Headwaters of a Third-Order Stream

2019 ◽  
Vol 85 (11) ◽  
Author(s):  
Morgan E. Teachey ◽  
Jacob M. McDonald ◽  
Elizabeth A. Ottesen
Keyword(s):  
Microbial Community ◽  
Microbial Diversity ◽  
Community Assembly ◽  
Fine Scale ◽  
Third Order ◽  
Order Stream ◽  
Bacterioplankton Community ◽  
Small Streams ◽  
Temporal And Spatial ◽  
Over Time

ABSTRACTSmall streams and their headwaters are key sources of microbial diversity in fluvial systems and serve as an entry point for bacteria from surrounding environments. Community assembly processes occurring in these streams shape downstream population structure and nutrient cycles. To elucidate the development and stability of microbial communities along the length of a first- through third-order stream, fine-scale temporal and spatial sampling regimes were employed along McNutt Creek in Athens, GA, USA. 16S rRNA amplicon libraries were constructed from samples collected on a single day from 19 sites spanning the first 16.76 km of the stream. To provide context for this spatial study and evaluate temporal variability, selected sites at the stream’s upper, mid, and lower reaches were sampled daily for 5 days preceding and following the spatial study. In a second study, three sites at and near the creek’s headwaters were sampled daily for 11 days to understand initial bacterioplankton community assembly. Both studies revealed decreasing alpha and beta diversity with increasing downstream distance. These trends were accompanied by the enrichment of a small fraction of taxa found at low abundance in headwater-proximal sites. Similar sets of taxa consistently increased in relative abundance in downstream samples over time scales ranging from 1 day to 1 year, many of which belong to clades known to be abundant in freshwater environments. These results underpin the importance of headwaters as the site of rapid in-stream selection that results in the reproducible establishment of a highly stable community of freshwater riverine bacteria.IMPORTANCEHeadwater streams are critical introduction points of microbial diversity for larger connecting rivers and play key roles in the establishment of taxa that partake in in-stream nutrient cycling. We examined the microbial community composition of a first- through third-order stream using fine-scale temporal and spatial regimes. Our results show that the bacterioplankton community develops rapidly and predictably from the headwater population with increasing total stream length. Along the length of the stream, the microbial community exhibits substantial diversity loss and enriches repeatedly for select taxa across days and years, although the relative abundances of individual taxa vary over time and space. This repeated enrichment of a stable stream community likely contributes to the stability and flexibility of downstream communities.

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