scholarly journals Rapid and objective characterization of channel morphology in a small, forested stream

2020 ◽  
Author(s):  
Carina Helm ◽  
Marwan A. Hassan ◽  
David Reid
Keyword(s):  
Spatial Scale ◽  
Forest Canopy ◽  
Morphological Variability ◽  
Principal Component ◽  
Morphological Diversity ◽  
Channel Morphology ◽  
Classification Rate ◽  
Cross Sectional ◽  
Small Width ◽  
Gravel Bed Streams

Abstract. Forested, gravel bed streams possess complex channel morphologies which are difficult to objectively characterise. The spatial scale necessary to adequately capture variability in these streams is often unclear, as channels are governed by irregularly spaced features and episodic processes. This issue is compounded by the high cost and time-consuming nature of field surveys in this type of environment. In larger stream systems, remotely piloted aircraft (RPAs) have proven to be effective tools for characterizing channels at high resolutions over large spatial extents, but to date their use in small, forested streams with closed forest canopies has been limited. This paper seeks to demonstrate an objective method for characterizing channel attributes over large areas, using easily extractable data from RPA imagery collected under the forest canopy in a small (width = 10 to 15 m) stream, and to provide information on the spatial scale necessary to capture the dominant spatial morphological variability of these channels. First, the accuracy and coverage of RPAs for extracting channel data was investigated through a sub-canopy survey. From this survey data, relevant cross-sectional variables were extracted and used to characterize channel unit morphology using a principal component analysis-clustering (PCA-clustering) technique. Finally, the length scale required to capture dominant morphological variability was investigated from analysis of morphological diversity along nearly 3 km of channel. The results demonstrate that sub-canopy RPA surveys provide a viable alternative to traditional survey approaches for characterizing these systems, with 87 % coverage of the main channel stream bed. The PCA-clustering analysis provided a more objective means of classifying channel morphology with a correct classification rate of 85 %. Analysis of morphological diversity suggests that reaches of at least 15 bankfull width equivalents are required to capture the channel's dominant heterogeneity. Altogether, the results provide a precedent for using RPAs to characterize the morphology and diversity of forested streams under dense canopies.

scholarly journals Characterization of morphological units in a small, forested stream using close-range remotely piloted aircraft imagery

2020 ◽  
Vol 8 (4) ◽  
pp. 913-929
Author(s):  
Carina Helm ◽  
Marwan A. Hassan ◽  
David Reid
Keyword(s):  
Spatial Scale ◽  
Forest Canopy ◽  
Morphological Variability ◽  
Morphological Diversity ◽  
Point Clouds ◽  
Flying Height ◽  
Small Width ◽  
Remotely Piloted Aircraft ◽  
Close Range ◽  
Channel Unit

Abstract. Forested, gravel-bed streams possess complex channel morphologies which are difficult to objectively characterize. The spatial scale necessary to adequately capture variability in these streams is often unclear, as channels are governed by irregularly spaced features and episodic processes. This issue is compounded by the high cost and time-consuming nature of field surveys in these complex fluvial environments. In larger streams, remotely piloted aircraft (RPA) have proven to be effective tools for characterizing channels at high resolutions over large spatial extents, but to date their use in small, forested streams with closed forest canopies has been limited. This paper seeks to demonstrate an effective method for classifying channel morphological units in small, forested streams and for providing information on the spatial scale necessary to capture the dominant spatial morphological variability of these channels. This goal was achieved using easily extractable data from close-range RPA imagery collected under the forest canopy (flying height of 5–15 m above ground level; ma.g.l.) in a small (width of 10–15 m) stream along its 3 km of salmon-bearing channel. First, the accuracy and coverage of RPA for extracting channel data were investigated through a subcanopy survey. From these survey data, relevant cross-sectional variables (hydraulic radius, sediment texture, and channel slope) were extracted from high-resolution point clouds and digital elevation models (DEMs) of the channel and used to characterize channel unit morphology using a principal component analysis-clustering (PCA-clustering) technique. Finally, the length scale required to capture dominant morphological variability was investigated from an analysis of morphological diversity along the channel. The results demonstrate that subcanopy RPA surveys provide a viable alternative to traditional ground-based survey approaches for mapping morphological units, with 87 % coverage of the main channel stream bed achieved. The PCA-clustering analysis provided a comparatively objective means of classifying channel unit morphology with a correct classification rate of 85 %. An analysis of the morphological diversity along the surveyed channel indicates that reaches of at least 15 bankfull width equivalents are required to capture the channel's dominant morphological heterogeneity. Altogether, the results provide a precedent for using RPA to characterize the morphology and diversity of forested streams under dense canopies.

scholarly journals Morphological variation of wild peppers (Capsicum spp.) from the state of Tabasco, Mexico

2018 ◽  
pp. 115 ◽  
Author(s):  
Julio C. V.-Ventura, Efrain de la Cruz-Lazaro ◽  
Rodolfo Osorio- Osorio ◽  
Pablo Preciado- Rangel
Keyword(s):  
Morphological Variability ◽  
Principal Component ◽  
Morphological Diversity ◽  
Fruit Shape ◽  
Field Trips ◽  
Leaf Length ◽  
The State ◽  
Mean Values ◽  
Capsicum Spp ◽  
Branch Density

The pepper (Capsicum spp.) is one of the most important vegetables in Mexico. The aim of this study was to collect wild peppers and characterize in situ their morphological diversity. From January to November 2015, field trips were made to 54 locations in 15 municipalities in the state of Tabasco, Mexico; 131 collections were obtained in which a total of 23 plant, flower and fruit variables were evaluated. With the mean values of the variables, principal component (PC) and cluster analyses were performed. The first three PCs explained 65.2% of total morphological variability, with the variables fruit length, fruit shape, fruit width, leaf width, leaf length, plant height and branch density providing a greater explanation for the diversity. Cluster analysis grouped the 131 collections into two groups, one formed by the morphotypes 'Amashito', 'Garbanzo' and 'Ojo de cangrejo', with characteristics of C. annuum var. Glabriusculum, and the second group with the morphotype 'Pico de paloma' with characteristics of the species C. frutescens L. It is concluded that the wild peppers of the State of Tabasco have morphological diversity, which must be preserved as a genetic resource of interest.

scholarly journals Three-dimensional morphological variability of Recent rhynchonellide brachiopod crura

Paleobiology ◽  
10.1666/13042 ◽  
2014 ◽  
Vol 40 (4) ◽  
pp. 640-658 ◽  
Author(s):  
Holly A. Schreiber ◽  
Peter D. Roopnarine ◽  
Sandra J. Carlson
Keyword(s):  
Imaging Techniques ◽  
Morphological Variability ◽  
Three Dimensional ◽  
Principal Component ◽  
Shape Space ◽  
Ontogenetic Changes ◽  
Cross Sectional ◽  
Evolutionary Transitions ◽  
Geometric Morphometric ◽  
Computed Microtomography

Crura, the calcareous support structures of the lophophore in rhynchonellide brachiopods, have historically been used to justify higher-level rhynchonellide classification and reveal major evolutionary lineages within rhynchonellides. Seventeen crural types have been described and categorized into four groups based on variation in overall structure and cross-sectional shape, but not evaluated in a quantitative or comprehensive manner. Heterochrony has been hypothesized to play a role in the evolutionary transitions among some types, but the structural, developmental, and phylogenetic context for testing these hypotheses has not yet been established. In this study, we use three-dimensional geometric morphometric techniques to quantify morphological disparity among all six crural morphs in Recent adult rhynchonellides, with the goal of delineating more objective criteria for identifying and comparing crural morphs, ultimately to test hypotheses explaining morphological transformations in ontogeny and phylogeny. We imaged the crura of seven Recent rhynchonellide species, using X-ray computed microtomography. We used landmarks and semi-landmarks to define the dimensions and curvature of the crura and the surrounding hinge area. Procrustes-standardized landmark coordinates were analyzed using a principal component analysis to test the discreteness of the individual crural morphs and named groups of morphs, and to identify features that vary most among the crural configurations.Our results demonstrate that microCT imaging techniques provide novel ways to investigate the morphology of small features that may be otherwise impossible to quantify using more conventional imaging techniques. Although we predicted overlap among crural morphs in the 3-D shape space, the principal component analyses suggest that five of the six crural morphs differ distinctly from one another. Some but not all previously designated crural groups appear to exhibit morphological cohesion. This study establishes a quantitative morphological foundation necessary to begin an investigation of the phylogenetic significance of ontogenetic changes in crura, which will allow hypotheses of heterochrony to be tested.

Replicated ecological landscapes and the evolution of morphological diversity among Gasterosteus populations from an archipelago on the west coast of Canada

2006 ◽  
Vol 84 (5) ◽  
pp. 643-654 ◽  
Author(s):  
T.E. Reimchen ◽  
P. Nosil
Keyword(s):  
Gasterosteus Aculeatus ◽  
Morphological Variability ◽  
Principal Component ◽  
Morphological Diversity ◽  
Sexually Dimorphic ◽  
Haida Gwaii ◽  
Body Depth ◽  
Eye Diameter ◽  
Freshwater Stickleback ◽  
Gill Raker

We investigated defence and trophic morphology of 40 freshwater stickleback (Gasterosteus aculeatus L., 1758) populations from the Banks–Estevan archipelago for comparison with the isolated stickleback populations from the nearby Haida Gwaii archipelago. Using 14 size-standardized metric traits and 11 meristic or categorical traits from 1706 individuals (14–54/site), we found that the first principal component (PC1) defined a defence apparatus characterized by high loadings for pelvic spine length, number of forks on the ascending process, number of lateral plates, and overlap between lateral and basal plates. The second component (PC2) defined a trophic apparatus characterized by high loadings for gape length, eye diameter, and body depth. Populations with loss of spines, loss of plates, increased gape, increased body depth, and low gill raker number were most prevalent in ponds and shallow lakes with low conductivity. Most traits were sexually dimorphic, with males exhibiting greater armature and increased benthic trophic adaptations. We observed substantially less morphological variability among Banks–Estevan stickleback populations than among the Haida Gwaii populations and one instance of common ancestry or convergence to the giant black stickleback of Haida Gwaii.

scholarly journals Morphological Diversity and Bioactive Compounds in Wall Rocket (Diplotaxis erucoides (L.) DC.)

Agronomy ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 306 ◽  
Author(s):  
Carla Guijarro-Real ◽  
Jaime Prohens ◽  
Adrián Rodríguez-Burruezo ◽  
Ana Fita
Keyword(s):  
Growth Habit ◽  
Total Phenolics ◽  
Morphological Variability ◽  
Principal Component ◽  
Morphological Diversity ◽  
Breeding Programs ◽  
New Information ◽  
Diplotaxis Erucoides ◽  
Positive Correlations ◽  
Selection Of

Wall rocket is a wild vegetable with interest to become a crop. However, the information regarding morphological variability in the species is scarce, despite the interest it has received for breeding programs. In addition, evaluating the phytochemical composition can also be useful for developing materials of a high quality. In this study, forty-four populations were evaluated for selected morphoagronomic traits and contents in ascorbic acid (AA), total phenolics (TP), and nitrates (NO3−). Wall rocket plants had, on average, an intermediate growth habit and a good response to transplant. Moderate variability, mainly for size-related traits, was found, with low to moderate heritability estimates (H2 < 0.35). A Principal Component Analysis revealed that some materials may be selected for differenced traits. On the other hand, wall rocket materials had, on average, high contents in AA (53 mg 100 g−1) and TP (116 mg CAE 100 g−1) but also accumulated high levels of NO3− (891 mg 100 g−1). Significant positive correlations were found for AA and TP, which could be exploited for increasing the antioxidant activity and properties of the final product. We provide new information on the variation of wall rocket for traits of morphological and phytochemical interest, which together with other traits, such as the profile of glucosinolates, can be useful for the selection of materials in future breeding programs.

scholarly journals Mass Media Influence on Changing Healthy Lifestyle of Community People During COVID-19 Pandemic in Bangladesh: A Cross-Sectional Survey

2021 ◽  
pp. 101053952110110
Author(s):  
Md. Nazrul Islam ◽  
Abu Reza Md. Towfiqul Islam ◽  
Md. Sajjat Hossain ◽  
Md. Tabiur Rahman Prodhan ◽  
Mohammad Hasan Chowdhury ◽  
...  
Keyword(s):  
Mass Media ◽  
Healthy Lifestyle ◽  
Principal Component ◽  
Multiple Regression Model ◽  
Stepwise Multiple Regression ◽  
Media Influence ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Mass Media Influence ◽  
Stepwise Multiple Regression Model

We aimed to assess mass media influence on changing the healthy lifestyle behavior of people during the early phase of the COVID-19 (coronavirus disease 2019) pandemic. Principal component analysis and stepwise multiple regression model showed that knowledge level, media credibility, and media check-in had the most considerable contribution to influencing community people’s healthy lifestyle.

scholarly journals Association between Chronotype and Nutritional, Clinical and Sociobehavioral Characteristics of Adults Assisted by a Public Health Care System in Brazil

Nutrients ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 2260
Author(s):  
Juliana C. Reis-Canaan ◽  
Marcelo M. Canaan ◽  
Patrícia D. Costa ◽  
Tamires P. Rodrigues-Juliatte ◽  
Michel C. A. Pereira ◽  
...  
Keyword(s):  
Public Health ◽  
Heart Diseases ◽  
Principal Component ◽  
Public Health Care ◽  
Noncommunicable Diseases ◽  
Behavioral Risk ◽  
Omega 3 ◽  
Cross Sectional ◽  
Omega 6 ◽  
Sodium Zinc

Chronotype (CT) has been associated with predisposition to chronic noncommunicable diseases (CNCDs), such as diabetes mellitus and obesity. However, the effects of CT on individuals assisted by public health systems (PHSs) in middle-up economies are still poorly explored. The objective of this study was to evaluate the relationship between CT and clinical, sociobehavioral and nutritional aspects in adults assisted by a PHS in Brazil. This is a population-based cross-sectional study. The sample consisted of 380 individuals, selected through probabilistic sampling by clusters, in all health units in a city of approximately 100 thousand inhabitants. Data collection was performed during home visits, by means of general and nutritional interviews, anthropometric measurements and the Morningness–Eveningness Questionnaire (MEQ). Statistical analysis comprised chi-square test and principal component analysis (CPA) followed by Fisher’s discriminant analysis to determine aspects associated with each CT (morning, evening or intermediate). With the aim of explaining the variation in the CT scores, the consumption of micronutrients (corrected to the total energy intake) and other individual and sociodemographic variables were used as explanatory factors in the adjustment of a linear regression model. The morning group was characterized by older men, with less than eight years of schooling, with low body mass index (BMI) and with low intake of omega-6, omega-3, sodium, zinc, thiamine, pyridoxine and niacin. The evening group, on the other hand, was composed of younger individuals, with a high consumption of these same nutrients, with high BMI and a higher frequency of heart diseases (p < 0.05). It was concluded that most morning CT individuals were elderly thin males with lower consumption of omega-6 and -3, sodium, zinc, thiamine, pyridoxine and niacin, whereas evening individuals were younger, had higher BMI and had higher consumption of the studied micronutrients. The identification of circadian and behavioral risk groups can help to provide preventive and multidisciplinary health promotion measures.

scholarly journals An analysis of heavy metals contamination and estimating the daily intakes of vegetables from Uganda

2021 ◽  
Vol 5 ◽  
pp. 239784732098525
Author(s):  
Keneth Iceland Kasozi ◽  
Eric Oloya Otim ◽  
Herbert Izo Ninsiima ◽  
Gerald Zirintunda ◽  
Andrew Tamale ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Daily Intake ◽  
Principal Component ◽  
Absorption Spectrometry ◽  
Cross Sectional Study ◽  
Essential Elements ◽  
World Health ◽  
Cross Sectional ◽  
Health Organization ◽  
Daily Intakes

Background: Environmental contamination with elevated levels of copper (Cu), cobalt (Co), iron (Fe), zinc (Zn), lead (Pb), chromium (Cr6+), cadmium (Cd), and nickel (Ni)—all states of which are found in Uganda—raises health risk to the public. Pb, Cr6+, Cd, and Ni for instance are generally considered nonessential to cellular functions, notwithstanding the importance of the oxidative state of the metals in bioavailability. As such, we aimed in this study (i) to evaluate heavy metal concentrations in four vegetables from a typical open-air market in Uganda, (ii) to assess the safety of consuming these vegetables against the World Health Organization (WHO) recommended limits of heavy metals consumption, and (iii) to formulate a model of estimated daily intake (EDI) among consumers in the country. Methods: This was a cross-sectional study conducted in five georeferenced markets of Bushenyi district in January 2020. Amaranthus, cabbages, scarlet eggplants, and tomatoes were collected from open markets, processed, and analyzed by atomic absorption spectrometry. Modeled EDI, principal component (PCA) and cluster analysis (CA) were conducted to identify relationships in the samples. Results: The levels of essential elements in the four vegetables were found to fall from Co > Cu > Fe > Zn. Those of non-essential metals were significantly higher and followed the pattern Cd > Cr > Pb > Ni. The highest EDI values were those of Cu in scarlet eggplants, Zn in amaranthus, Fe in amaranthus, Co in amaranthus, Pb in cabbages, total Cr in scarlet eggplant, Cd in cabbages and tomatoes, and Ni in cabbages. In comparison to international limits, EDIs for Zn, Cu, Co and Fe were low while Ni in cabbages were high. PCA showed high variations in scarlet eggplant and amaranthus. The study vegetables were found to be related with each other, not according to the location of the markets from where they were obtained, but according to their species by CA. Conclusion: The presence of non-essential elements above WHO limits raises policy challenges for the consumption and marketing of vegetables in the study area. Furthermore, low EDIs of essential elements in the vegetables create demand for nutritious foods to promote healthy communities.

scholarly journals Validation of the Dutch-language version of Nurses’ Moral Courage Scale

2021 ◽  
pp. 096973302098175
Author(s):  
Olivia Numminen ◽  
Kasper Konings ◽  
Roelant Claerhout ◽  
Chris Gastmans ◽  
Jouko Katajisto ◽  
...  
Keyword(s):  
Goodness Of Fit ◽  
Scale Validation ◽  
Principal Component ◽  
Moral Courage ◽  
Copyright Holder ◽  
Moral Competence ◽  
Cross Sectional ◽  
Component Structure ◽  
Language Version ◽  
Dutch Language

Background: Moral courage as a part of nurses’ moral competence has gained increasing interest as a means to strengthen nurses acting on their moral decisions and offering alleviation to their moral distress. To measure and assess nurses’ moral courage, the development of culturally and internationally validated instruments is needed. Objective: The objective of this study was to validate the Dutch-language version of the four-component Nurses’ Moral Courage Scale originally developed and validated in Finnish data. Research design: This methodological study used non-experimental, cross-sectional exploratory design. Participants and research context: A total of 559 nurses from two hospitals in Flanders, Belgium, completed the Dutch-language version of the Nurses’ Moral Courage Scale. Ethical considerations: Good scientific inquiry guidelines were followed throughout the study. Permission to translate the Nurses’ Moral Courage Scale was obtained from the copyright holder, and the ethical approval and permissions to conduct the study were obtained from the participating university and hospitals, respectively. Findings: The four-component 21-item, Dutch-language version of the Nurses’ Moral Courage Scale proved to be valid and reliable as the original Finnish Nurses’ Moral Courage Scale. The scale’s internal consistency reliability was high (0.91) corresponding with the original Nurses’ Moral Courage Scale validation study (0.93). The principal component analysis confirmed the four-component structure of the original Nurses’ Moral Courage Scale to be valid also in the Belgian data explaining 58.1% of the variance. Confirmatory factor analysis based on goodness-of-fit indices provided evidence of the scale’s construct validity. The use of a comparable sample of Belgian nurses working in speciality care settings as in the Finnish study supported the stability of the structure. Discussion and conclusion: The Dutch-language version of the Nurses’ Moral Courage Scale is a reliable and valid instrument to measure nurses’ self-assessed moral courage in speciality care nursing environments. Further validation studies in other countries, languages and nurse samples representing different healthcare environments would provide additional evidence of the scale’s validity and initiatives for its further development.

scholarly journals The Perceived Impact of The First UK Covid-19 Lockdown on Companion Animal Welfare and Behaviour: A Mixed-Method Study of Associations with Owner Mental Health

2021 ◽  
Vol 18 (11) ◽  
pp. 6171
Author(s):  
Emily Shoesmith ◽  
Luciana Santos de Assis ◽  
Lion Shahab ◽  
Elena Ratschen ◽  
Paul Toner ◽  
...  
Keyword(s):  
Mental Health ◽  
Animal Welfare ◽  
Online Survey ◽  
Negative Impact ◽  
Companion Animals ◽  
Principal Component ◽  
Companion Animal ◽  
Free Text ◽  
Cross Sectional ◽  
Human Animal

Background: Companion animals may be a positive presence for their owners during the Covid-19 pandemic. However, the welfare of a companion animal is strongly influenced by the behaviour of their owners, as well as their physical and social environment. We aimed to investigate the reported changes in companion animal welfare and behaviour and to examine the association between these changes and companion animal owners’ mental health. Methods: A cross-sectional online survey of UK residents over 18 years of age was conducted between April and June 2020 (n = 5926). The questionnaire included validated, bespoke items measuring outcomes related to mental health, human-animal bonds and reported changes in animal welfare and behaviour. The final item of the survey invited open-ended free-text responses, allowing participants to describe experiences associated with human-animal relationships during the first UK lockdown phase. Results: Animal owners made up 89.8% of the sample (n = 5323), of whom 67.3% reported changes in their animal’s welfare and behaviour during the first lockdown phase (n = 3583). These reported changes were reduced to a positive (0–7) and negative (0–5) welfare scale, following principal component analysis (PCA) of 17 items. Participants reported more positive changes for cats, whereas more negative changes were reported for dogs. Thematic analysis identified three main themes relating to the positive and negative impact on companion animals of the Covid-19 pandemic. Generalised linear models indicated that companion animal owners with poorer mental health scores pre-lockdown reported fewer negative changes in animal welfare and behaviour. However, companion animal owners with poorer mental health scores since lockdown reported more changes, both positive and negative, in animal welfare and behaviour. Conclusion: Our findings extend previous insights into perceived welfare and behaviour changes on a very limited range of species to a wider a range of companion animals. Owner mental health status has a clear, albeit small, effect on companion animal welfare and behaviour.

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