Spatial distribution patterns of larval cytotypes of the Simulium venustum/verecundum complex (Diptera: Simuliidae) on the Avalon Peninsula, Newfoundland: factors associated with cytotype abundance and composition

1992 ◽  
Vol 70 (7) ◽  
pp. 1389-1396 ◽  
Author(s):  
J. W. McCreadie ◽  
M. H. Colbo
Keyword(s):  
Drainage Basin ◽  
Principal Component ◽  
Distribution Patterns ◽  
Restricted Gene Flow ◽  
Regression Analyses ◽  
Factors Associated ◽  
Sampling Protocols ◽  
Stream Size ◽  
Avalon Peninsula ◽  
Qualitative Changes

Using principal component analysis and cluster and regression analyses, larval macrodistribution of Simulium venustum/verecundum complex cytotypes within a drainage basin and along a stream continuum was investigated. Cytotypes included ACD (= Simulium rostratum Lundström) and AA from the verecundum line of the complex and EFG/C (= Simulium truncatum Lundström), AC(gb) and CC2-3 (combined CC2 and CC3) from the venustum line. Abundance of both AC(gb) and CC2-3 increased with increasing stream size. The abundance of CC2-3 also increased at sites with warmer temperatures and lower conductivity, dissolved oxygen, and pH levels. Cytotype composition changed in a continuous, directional, and predictable (R2 = 52.4–92.2%) manner with increased distance from outlets. It is argued that changes in cytotype composition must be considered in future sampling protocols, as quantitative and qualitative changes in the cytotype assemblage can occur over distances as short as 100 m. Discontinuity in the frequency of the IIL-4 polymorphism suggested restricted gene flow due to limited adult AA dispersal over distances greater than 12 km.

Spatial distribution patterns of larval cytotypes of the Simulium venustum/verecundum complex (Diptera: Simuliidae) on the Avalon Peninsula, Newfoundland: factors associated with occurrence

1991 ◽  
Vol 69 (10) ◽  
pp. 2651-2659 ◽  
Author(s):  
John W. McCreadie ◽  
Murray H. Colbo
Keyword(s):  
Spatial Distribution ◽  
Distribution Patterns ◽  
Geographic Area ◽  
Emergent Vegetation ◽  
Spatial Distribution Patterns ◽  
Factors Associated ◽  
Summer Generation ◽  
Small Streams ◽  
Almost All ◽  
Avalon Peninsula

Larval macrodistribution of cytotypes of the Simulium venustum/verecundum complex among 60 stream sites over a limited geographic area (Avalon Peninsula, Newfoundland) was investigated. Cytotypes included EFG/C, ACD, AA AC(gb), and CC2-3 (combined CC2 and CC3). Stream sites were classified into four types: outlets, trickles, small streams, and large streams. Factors that might explain patterns of occurrence (presence or absence) were examined using correlation, frequency, and cluster analyses. The data showed that larval EFG/C and ACD dominated outlet sites. The CC2-3 and AC(gb) cytotypes were most frequent at downstream sites. In downstream locations CC2-3 was found at almost all sites, whereas AC(gb) was most frequently found in cool, canopied streams, where the bottom consisted mainly of small stones and rubble. In the spring AA was most common at outlet sites. In the summer AA was most frequently found at outlets and trickles. The summer generation(s) of AA was associated with the distribution of trailing and emergent vegetation.

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

scholarly journals Impact of aquaculture on distribution of dissolved organic matter in coastal Jeju Island, Korea, based on absorption and fluorescence spectroscopy

2021 ◽  
Author(s):  
Jeonghyun Kim ◽  
Yeseul Kim ◽  
Sung Eun Park ◽  
Tae-Hoon Kim ◽  
Bong-Guk Kim ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Fluorescence Spectroscopy ◽  
Dissolved Organic Matter ◽  
Coastal Water ◽  
Coastal Region ◽  
Principal Component ◽  
Distribution Patterns ◽  
Organic Pollution ◽  
Jeju Island

AbstractIn Jeju Island, multiple land-based aquafarms were fully operational along most coastal region. However, the effect of effluent on distribution and behaviours of dissolved organic matter (DOM) in the coastal water are still unknown. To decipher characteristics of organic pollution, we compared physicochemical parameters with spectral optical properties near the coastal aquafarms in Jeju Island. Absorption spectra were measured to calculate the absorption coefficient, spectral slope coefficient, and specific UV absorbance. Fluorescent DOM was analysed using fluorescence spectroscopy coupled with parallel factor analysis. Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) were measured using high-temperature catalytic oxidation. The DOC concentration near the discharge outlet was twice higher than that in natural groundwater, and the TDN concentration exponentially increased close to the outlet. These distribution patterns indicate that aquafarms are a significant source of DOM. Herein, principal component analysis was applied to categorise the DOM origins. There were two distinct groups, namely, aquaculture activity for TDN with humic-like and high molecular weights DOM (PC1: 48.1%) and natural biological activity in the coastal water for DOC enrichment and protein-like DOM (PC2: 18.8%). We conclude that the aquafarms significantly discharge organic nitrogen pollutants and provoke in situ production of organic carbon. Furthermore, these findings indicate the potential of optical techniques for the efficient monitoring of anthropogenic organic pollutants from aquafarms worldwide.

scholarly journals Factors associated with prominent vessel sign on susceptibility-weighted imaging in acute ischemic stroke

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hai-fei Jiang ◽  
Yi-qun Zhang ◽  
Jiang-xia Pang ◽  
Pei-ning Shao ◽  
Han-cheng Qiu ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Large Vessel ◽  
Susceptibility Weighted Imaging ◽  
Regression Analyses ◽  
Large Vessel Occlusion ◽  
Stroke Patients ◽  
Anterior Circulation ◽  
Vessel Occlusion ◽  
Factors Associated ◽  
Univariate Analyses

AbstractThe prominent vessel sign (PVS) on susceptibility-weighted imaging (SWI) is not displayed in all cases of acute ischemia. We aimed to investigate the factors associated with the presence of PVS in stroke patients. Consecutive ischemic stroke patients admitted within 24 h from symptom onset underwent emergency multimodal MRI at admission. Associated factors for the presence of PVS were analyzed using univariate analyses and multivariable logistic regression analyses. A total of 218 patients were enrolled. The occurrence rate of PVS was 55.5%. Univariate analyses showed significant differences between PVS-positive group and PVS-negative group in age, history of coronary heart disease, baseline NIHSS scores, total cholesterol, hemoglobin, anterior circulation infarct, large vessel occlusion, and cardioembolism. Multivariable logistic regression analyses revealed that the independent factors associated with PVS were anterior circulation infarct (odds ratio [OR] 13.7; 95% confidence interval [CI] 3.5–53.3), large vessel occlusion (OR 123.3; 95% CI 33.7–451.5), and cardioembolism (OR 5.6; 95% CI 2.1–15.3). Anterior circulation infarct, large vessel occlusion, and cardioembolism are independently associated with the presence of PVS on SWI.

scholarly journals Willingness to receive future COVID-19 vaccines following the COVID-19 epidemic in Shanghai, China

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yehong Zhou ◽  
Junjie Zhang ◽  
Wenwen Wu ◽  
Man Liang ◽  
Qiang-Song Wu
Keyword(s):  
Vaccine Safety ◽  
Older Individuals ◽  
Regression Analyses ◽  
Pharmacological Interventions ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Factors Associated ◽  
History Of ◽  
Potential Factors ◽  
To Receive

Abstract Background There are no pharmacological interventions currently available to prevent the transmission of SARS-CoV-2 or to treat COVID-19. The development of vaccines against COVID-19 is essential to contain the pandemic. we conducted a cross-sectional survey of Shanghai residents to understand residents’ willingness to be vaccinated with any future COVID-19 vaccines and take measures to further improve vaccination coverage. Methods We conducted a cross-sectional survey using self-administered anonymous questionnaires from 1 July to 8 September 2020. The main outcome was willingness of participants, and any children or older individuals living with them, to receive future COVID-19 vaccines. Logistic regression analyses were used to explore potential factors associated with vaccination willingness. Results A total of 1071 participants were asked about their willingness to receive future COVID-19 vaccines, for themselves and at least 747 children and 375 older individuals (≥60 years old) living with them. The highest proportion of expected willingness to vaccinate was among participants (88.6%), followed by children (85.3%) and older individuals (84.0%). The main reasons for reluctance to vaccinate among 119 participants were doubts regarding vaccine safety (60.0%) and efficacy (28.8%). Participants with a self-reported history of influenza vaccination were more likely to accept COVID-19 vaccines for themselves [adjusted odds ratio (OR) = 1.83; 95% confidence interval (CI): 1.19–2.82], their children (adjusted OR = 2.08; 95%CI: 1.30–3.33), and older individuals in their household (adjusted OR = 2.12; 95%CI: 1.14–3.99). Participants with older individuals in their families were less willing to vaccinate themselves (adjusted OR = 0.59; 95%CI: 0.40–0.87) and their children (adjusted OR = 0.58; 95%CI: 0.38–0.89). Conclusions Participants were more reluctant to accept COVID-19 vaccines for older individuals living with them. The presence of older individuals in the home also affected willingness of participants and their children to be vaccinated.

scholarly journals Regional GRACE-based estimates of water mass variations over Australia: validation and interpretation

2013 ◽  
Vol 17 (12) ◽  
pp. 4925-4939 ◽  
Author(s):  
L. Seoane ◽  
G. Ramillien ◽  
F. Frappart ◽  
M. Leblanc
Keyword(s):  
Water Mass ◽  
Drainage Basin ◽  
Principal Component ◽  
Component Analysis ◽  
Climate Index ◽  
Accurate Estimation ◽  
Total Water ◽  
Spatial And Temporal Patterns ◽  
Regional Solutions

Abstract. Time series of regional 2° × 2° Gravity Recovery and Climate Experiment (GRACE) solutions have been computed from 2003 to 2011 with a 10-day resolution by using an energy integral method over Australia (112° E–156° E; 44° S–10° S). This approach uses the dynamical orbit analysis of GRACE Level 1 measurements, and specially accurate along-track K-band range rate (KBRR) residuals with a 1 μm s−1 level of errors, to estimate the total water mass over continental regions. The advantages of regional solutions are a significant reduction of GRACE aliasing errors (i.e. north–south stripes) providing a more accurate estimation of water mass balance for hydrological applications. In this paper, the validation of these regional solutions over Australia is presented, as well as their ability to describe water mass change as a response of climate forcings such as El Niño. Principal component analysis of GRACE-derived total water storage (TWS) maps shows spatial and temporal patterns that are consistent with independent data sets (e.g. rainfall, climate index and in situ observations). Regional TWS maps show higher spatial correlations with in situ water table measurements over Murray–Darling drainage basin (80–90%), and they offer a better localization of hydrological structures than classical GRACE global solutions (i.e. Level 2 Groupe de Recherche en Géodésie Spatiale (GRGS)) products and 400 km independent component analysis solutions as a linear combination of GRACE solutions provided by different centers.

scholarly journals Association of family risk and lifestyle/comorbidities in ovarian cancer patients

2015 ◽  
Vol 61 (3) ◽  
pp. 234-239 ◽  
Author(s):  
Natália Teixeira ◽  
Maria Aparecida Azevedo Koike Folgueira ◽  
Simone Maistro ◽  
Giselly Encinas ◽  
Geertruida Hendrika de Bock ◽  
...  
Keyword(s):  
Ovarian Cancer ◽  
Mutation Detection ◽  
Regression Analyses ◽  
Family Risk ◽  
Familial Predisposition ◽  
Factors Associated ◽  
System A ◽  
History Of ◽  
Psychiatric Conditions ◽  
The Impact

Summary Objectives: to analyze factors that might indicate familial predisposition for ovarian cancer in patients diagnosed with this disease. Methods: in a prospective single center cohort study at the Institute of Cancer of the State of São Paulo (ICESP), 51 women diagnosed with ovarian cancer were included. Familial predisposition for ovarian cancer was defined as having a higher than 10% chance of having a BRCA1/2 mutation according to the Manchester scoring system, a validated method to assess the likelihood of mutation detection. Each patient was interviewed with a standardized questionnaire on established risk factors for ovarian cancer and other factors that might influence the risk to develop ovarian cancer. Logistic regression analyses were performed to estimate the impact of the evaluated factors on the likelihood of mutation detection, by calculating odds ratios and 95% confidence intervals. Results: seventeen out of 51 patients had a family history of breast and/or ovarian cancer, four patients had a history of breast or endometrial cancer, 11 were diagnosed before the age of 50, and 12 presented a risk of familial predisposition to ovarian cancer higher than 10%. Patients with comorbidities, such as hypertension, diabetes, hormonal disorders, dyslipidemia and psychiatric conditions, presented a lower chance of having a familial predisposition for ovarian cancer (OR: 0.22; 95% CI: 0.06-0.88; p=0.03). Conclusion: in this study, having comorbidities was associated with a lower risk of having a familial predisposition for ovarian cancer. Other factors associated with the risk of ovarian cancer did not have an impact on this predisposition.

scholarly journals Influence on attitudes and lifestyle due to lockdown amidst COVID-19 pandemic: a perception-based analysis among Bangladeshi residents

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Md. Saiful Islam ◽  
Md. Asad Ullah ◽  
Ummay Soumayia Islam ◽  
Sahadat Hossain ◽  
Yusha Araf ◽  
...  
Keyword(s):  
Associated Factors ◽  
Formal Education ◽  
Rural Residence ◽  
Regression Analyses ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Factors Associated ◽  
Positive Attitudes ◽  
The Mean ◽  
Structured Questionnaire

Abstract Background Countrywide lockdown or stay-at-home order has been implemented to slow down the transmission of emergent coronavirus. However, the influence on attitudes and lifestyle due to lockdown amidst the coronavirus disease 2019 (COVID-19) pandemic has been poorly understood. The present study aimed to investigate the influence on attitudes and lifestyle due to lockdown amidst the COVID-19 pandemic among Bangladeshi residents. Methods A cross-sectional survey carried out involving 1635 community dwellers across eight divisions in Bangladesh conducted from April 15, 2020 to May 10, 2020. A structured questionnaire incorporating socio-demographic, attitudes towards lockdown and adverse lifestyle amidst lockdown measures was employed to collect data using the Google Forms. Multiple regression analyses were executed to determine the associated factors of positive attitudes towards lockdown and adverse lifestyle. Results The mean scores of attitudes towards lockdown were 67.9 (SD = 8.4) out of 85 with an overall correct rate (positive attitudes) of 79.9%; whereas the mean scores of adverse lifestyle amidst lockdown were 16.1 (SD = 4.8) out of 34 with an overall rate of 47.4%. The factors associated with more positive attitudes towards lockdown included being female, divorced, higher educated, and students. Conversely, being male, having no formal education, and rural residence were associated factors of adverse lifestyle amidst the COVID-19 pandemic. Conclusions The findings reflect how the COVID-19 lockdown has preciously impacted the attitudes, and lifestyle of Bangladeshi citizens, which will contribute to promoting appropriate measures during a subsequent zonal or complete lockdown.

scholarly journals School Outcomes among Elementary School-Aged Inuit Children in Inuit Nunangat

2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Rubab G. Arim ◽  
Benita Tam ◽  
Evelyne Bougie ◽  
Dafna E. Kohen
Keyword(s):  
Elementary School ◽  
Aboriginal Peoples ◽  
School Outcomes ◽  
Ecological Framework ◽  
Regression Analyses ◽  
Post Secondary Education ◽  
School Factors ◽  
Post Secondary ◽  
Factors Associated ◽  
Individual Family

The objective of this study was to examine factors associated with school outcomes among elementary school-aged Inuit children in Inuit Nunangat through a socio-ecological framework. The associations among children’s school outcomes and various individual, family, and school factors were examined using the 2012 Aboriginal Peoples Survey. Logistic regression analyses suggest that an Inuk child who is healthy and not hungry, whose parents obtained a post-secondary education, who is attending a school with a climate conducive to learning and at which parents are given opportunities to be involved, and who is exposed daily to the Inuit language has better odds of succeeding at school.

scholarly journals Risk factors for symptomatic Avascular Necrosis (AVN) in a multi-ethnic Systemic Lupus Erythematosus (SLE) cohort

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248845
Author(s):  
Syahrul Sazliyana Shaharir ◽  
Siew Huoy Chua ◽  
Rozita Mohd ◽  
Ruslinda Mustafar ◽  
Malehah Mohd Noh ◽  
...  
Keyword(s):  
Risk Factors ◽  
Logistic Regression ◽  
Avascular Necrosis ◽  
Lupus Erythematosus ◽  
Osteoporotic Fractures ◽  
Protective Effects ◽  
Regression Analyses ◽  
Mobility Limitations ◽  
Factors Associated ◽  
Multivariable Logistic Regression

Avascular necrosis of bone (AVN) is increasingly being recognized as a complication of SLE and causes significant disability due to pain and mobility limitations. We studied the prevalence and factors associated with avascular necrosis (AVN) in a multiethnic SLE cohort. SLE patients who visited the outpatient clinic from October 2017 to April 2019 were considered eligible. Their medical records were reviewed to identify patients who developed symptomatic AVN, as confirmed by either magnetic resonance imaging or plain radiography. Subsequently, their SLE disease characteristics and treatment were compared with the characteristics of patients who did not have AVN. Multivariable logistic regression analyses were performed to determine the independent factors associated with AVN among the multiethnic SLE cohort. A total of 390 patients were recruited, and the majority of them were females (92.6%); the patients were predominantly of Malay ethnicity (59.5%), followed by Chinese (35.9%) and Indian (4.6%). The prevalence of symptomatic AVN was 14.1%, and the mean age of AVN diagnosis was 37.6 ± 14.4 years. Both univariate and multivariable logistic regression analyses revealed that a longer disease duration, high LDL-C (low density lipoprotein cholesterol), positive anti-cardiolipin (aCL) IgG and anti-dsDNA results, a history of an oral prednisolone dose of more than 30 mg daily for at least 4 weeks and osteoporotic fractures were significantly associated with AVN. On the other hand, hydroxychloroquin (HCQ), mycophenolate mofetil (MMF) and bisphosphonate use were associated with a lower risk of AVN. No associations with ethnicity were found. In conclusion, several modifiable risk factors were found to be associated with AVN, and these factors may be used to identify patients who are at high risk of developing such complications. The potential protective effects of HCQ, MMF and bisphosphonates warrant additional studies.

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