Productivité en larves de moustiques (Diptera: Culicidae) des milieux aquatiques peu profonds d'un secteur du Moyen-Nord Québécois (LG-1, Territoire de la Baie de James)

1981 ◽  
Vol 59 (5) ◽  
pp. 738-749 ◽  
Author(s):  
Claude Tessier ◽  
Alain Maire ◽  
Antoine Aubin
Keyword(s):  
Relative Frequency ◽  
Larval Density ◽  
James Bay ◽  
Ecological Distribution ◽  
Carex Aquatilis ◽  
Aedes Mosquitoes ◽  
Carex Rostrata ◽  
Quantitative Results ◽  
The Mean ◽  
Ecological Unit

The LG-1 area (53°46′ N; 77°30′ W) is located on La Grande Rivière, 28 km upstream of its mouth at James Bay. It is a Middle Subarctic landscape. The ecological distribution of mosquito larval populations of 21 species is analyzed. For each ecological unit the following data are taken into account: the density of the larval community (larvae per metre cubed) and relative frequency (percentage) of the species per sample.The larval productivity of snowmelt Aedes mosquitoes is evaluated for each ecological unit from the percentage of the area covered by water (percentage), the average depth of the shallow pools (in metres) and the mosquito larval density. The mean number of larvae (log x) per hectare and the standard error of mean range from 4.77 ± 0.255 (33 000 < 59 000 < 106 000) in the Carex rostrata unit with peat bog substrate up to 7.12 ± 0.413 (5.1 × 106 < 1.3 × 107 < 3.4 × 107) in the silty Carex aquatilis unit. The mapping of a typical area of 2 500 ha in which 626 ha are mosquito-productive wetlands, shows an average productivity (log x) of 5.29 ± 0.146 (140 000 < 200 000 < 280 000). These data are compared with quantitative results published from similar northern localities.

scholarly journals Adaptive Image Enhancement Using Entropy-Based Subhistogram Equalization

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Liyun Zhuang ◽  
Yepeng Guan
Keyword(s):  
Image Enhancement ◽  
Dynamic Range ◽  
State Of The Art ◽  
Image Database ◽  
Input Image ◽  
Public Image ◽  
Contrast Enhanced ◽  
Quantitative Results ◽  
The Mean ◽  
Visual Assessments

A novel image enhancement approach called entropy-based adaptive subhistogram equalization (EASHE) is put forward in this paper. The proposed algorithm divides the histogram of input image into four segments based on the entropy value of the histogram, and the dynamic range of each subhistogram is adjusted. A novel algorithm to adjust the probability density function of the gray level is proposed, which can adaptively control the degree of image enhancement. Furthermore, the final contrast-enhanced image is obtained by equalizing each subhistogram independently. The proposed algorithm is compared with some state-of-the-art HE-based algorithms. The quantitative results for a public image database named CVG-UGR-Database are statistically analyzed. The quantitative and visual assessments show that the proposed algorithm outperforms most of the existing contrast-enhancement algorithms. The proposed method can make the contrast of image more effectively enhanced as well as the mean brightness and details well preserved.

scholarly journals First evaluation of coral recruitment in Madagascar

2021 ◽  
Vol 20 (1) ◽  
pp. 47-62
Author(s):  
Gildas G.B. Todinanahary ◽  
Nomeniarivelo Hasintantely ◽  
Igor Eeckhaut ◽  
Thierry Lavitra
Keyword(s):  
Larval Density ◽  
Average Density ◽  
Recruitment Rate ◽  
Seasonal Distribution ◽  
Coral Recruitment ◽  
Significant Difference ◽  
Southwest Region ◽  
The Mean ◽  
First Time ◽  
Very High

The distribution of larvae and recruitment of scleractinians in the southwest region of Madagascar were evaluated for the first time between October 2013 and September 2014 at 3 sites. The presence of coral larvae (planulae) was monitored through weekly sampling using a plankton net and the recruitment rate evaluated by monthly sampling of the newly settled corals (<1 year stage) on recruitment tiles and by a monitoring of the recruitment of juveniles (1< Juveniles < 2 years) using the quadrat method. Planulae were present in the plankton for 9 months during the survey. The recorded mean annual density of planula varied from 0.43 ± 0.41 larvae m-3 to 3.23 ± 5.72 larvae m-3 depending on site, with a peak in larval density towards the end of November and the beginning of December. The variability in the occurrence of planula is very high and implied that the density observed in the year does not present a significant difference between the sites (pKW=0.33). The average density of total recruits was 620.13 ± 621.30 recruits m-2, 40.28 ± 50.97 recruits m-2 and 36.34 ± 33.82 recruits m-2, respectively at the sites of Nosy Tafara, Grande Vasque and Rose Garden. Seasonal distribution of coral recruitment was different between the sites. The mean annual density of newly settled recruits (< 1 month stage) was significantly higher at Nosy Tafara with 94.91±101.08 recruits m-2 compared to Grande Vasque and Rose Garden with 18.75±34.32 recruits m-2 and 11.57±18.47 recruits m-2 (pKW<0.001), respectively. The highest density of newly settled recruits was observed between October to December. Higher density of recruits was also observed in March at Nosy Tafara and in May at all three sites. Results of juvenile monitoring showed high rates (> 10 juveniles m-2) compared to other regions and the threshold, but it revealed high mortality among recruits. Coral recruitment in the southwest region of Madagascar was found to be high and could result in increased resilience of the coral reef assemblages.

scholarly journals Open quotient (EGG) measurements of young and elderly voices: results of a production and perception study

2005 ◽  
Vol 40 ◽  
pp. 213-225
Author(s):  
Ralf Winkler ◽  
Walter Sendlmeier
Keyword(s):  
The Elderly ◽  
Positive Relation ◽  
Male And Female ◽  
Elderly Males ◽  
Significant Difference ◽  
Vocal Effort ◽  
Quantitative Results ◽  
The Mean ◽  
Perceived Age ◽  
Age Independent

This paper presents the results of Open Quotient measurements in EGG signals of young (18 to 30 year old) and elderly (59 to 82 year old) male and female speakers. The paper further presents quantitative results on the relation between the OQ and the perception of a speaker's age. Higgins & Saxman (1991) found a decreased OQEGG with increasing age for females, whereas the OQEGG in sustained vowel material increased for males as the speakers age increased. In Linville (2002), however, the spectral amplitudes in the region of F0 (obtained by LTAS-measurements of read speech material) increased with increasing age independent of gender; this could be interpreted indirectly as an increasing OQ. We measured the OQEGG not only for sustained vowels, but also in vowels taken from isolated words. In order to analyse the relation between breathiness in terms of an increased OQ and the mean perceived age per stimulus a perception test was carried out in which listeners were asked to estimate speaker's age based on sustained /a/-vowel stimuli varying in vocal effort (soft - normal - loud) during production. The results indicated the following: (i) The decreased OQ for elderly females originally found by Higgins & Saxman is not apparent in our data for sustained /a/-vowels. For our female speakers no significant difference between the OQ of young and old speakers was found; for elderly males, however, we also found an increasing OQ with increasing age.(ii) In addition, a statistically significant increased OQEGG occurs for the group of the elderly males for the vowels from the word material. (iii) Our results show a strong positive relation between perceived age and OQ in male voices. Regarding (i) and (ii), at least the male speaker's voice becomes more breathy as age increases. Considering (iii), increased breathiness may contribute to the listener’s perception of increased age.  

Temporal, diel and spatial variability of decapod larvae from St Paul's Rocks, an equatorial oceanic island of Brazil

2009 ◽  
Vol 90 (6) ◽  
pp. 1227-1239 ◽  
Author(s):  
Andrea G. Koettker ◽  
Andrea S. Freire ◽  
Paulo Y.G. Sumida
Keyword(s):  
Surface Waters ◽  
Larval Density ◽  
Ecological Systems ◽  
Scaling Analysis ◽  
Diel Variation ◽  
Multidimensional Scaling Analysis ◽  
Species Analysis ◽  
The Mean ◽  
First Time ◽  
Decapod Larvae

Temporal, spatial and diel variation in the distribution and abundance of organisms is an inherent property of ecological systems. The present study describes these variations and the composition of decapod larvae from the surface waters of St Paul's Rocks. The expeditions to the archipelago were carried out in April, August and November 2003, March 2004 and May 2005. Surface plankton samples were collected during the morning and dusk periods, inside the inlet and in increasing distances around the archipelago (~150, 700 and 1500 m). The identification resulted in 51 taxa. Seven species, six genera and larvae of the families Pandalidae and Portunidae were identified for the first time in the area. The mean larval density varied from zero to 150.2±69.6 individuals 100 m−3 in the waters surrounding the archipelago and from 1.7±3.0 to 12,827±15,073 individuals 100 m−3 inside the inlet. Significant differences on larval density were verified between months and period of the day, but not among the three sites around the archipelago. Cluster and non-metric multidimensional scaling analysis indicated that the decapod larvae community was divided into benthic and pelagic assemblages. Indicator species analysis (ISA) showed that six Brachyura taxa were good indicators for the inlet, while three sergestids were the main species from the waters around the archipelago. These results suggest that St Paul's Rocks can be divided into two habitats, based on larval composition, density and diversity values: the inlet and the waters surrounding the archipelago.

The Dynamic Behaviour of a Crystal During Defect Jumps

1986 ◽  
Vol 41 (8) ◽  
pp. 1051-1059 ◽  
Author(s):  
R. Vogelsang ◽  
C. Hoheisel
Keyword(s):  
Correlation Functions ◽  
Dynamic Behaviour ◽  
High Density ◽  
Mean Square ◽  
Pure Crystal ◽  
Pure Fluid ◽  
Fcc Lattice ◽  
Quantitative Results ◽  
The Mean

In continuation of a previous paper, M D simulations of vacancy jump in an fcc-lattice have been performed, due to an increased averaging process, quantitative results for a number of correlation functions are obtained, which throw light on the details of the highly cooperative mechanism of vacancy jumps involving some fifty neighbouring particles. This Part II is mainly concerned with self correlation functions while part III focusses on distinct correlation functions. Both the mean square displacements and the velocity correlations of the particles have been considered and were analysed in comparison with those of a pure crystal and a pure fluid of high density.

scholarly journals Haplotype block dynamics in hybrid populations

2016 ◽  
Author(s):  
Thijs Janzen ◽  
Arne W. Nolte ◽  
Arne Traulsen
Keyword(s):  
Relative Frequency ◽  
Haplotype Block ◽  
Genetic Recombination ◽  
Universal Function ◽  
Analytical Treatment ◽  
Ancestral Species ◽  
Haplotype Blocks ◽  
Hybrid Genome ◽  
The Mean ◽  
Over Time

ABSTRACTWhen species originate through hybridization, the genomes of the ancestral species are blended together. Over time genomic blocks that originate from either one of the ancestral species accumulate in the hybrid genome through genetic recombination. Modeling the accumulation of ancestry blocks can elucidate processes and patterns of genomic admixture. However, previous models have ignored ancestry block dynamics for chromosomes that consist of a discrete, finite number of chromosomal elements. Here we present an analytical treatment of the dynamics of the mean number of blocks over time, for continuous and discrete chromosomes, in finite and infinite populations. We describe the mean number of haplotype blocks as a universal function dependent on population size, the number of genomic elements per chromosome, the number of recombination events, and the initial relative frequency of the ancestral species.

scholarly journals The Effect of Rekattidiri Ovitrap towards Aedes aegypti Larval Density

2017 ◽  
Vol 6 (1) ◽  
pp. 80
Author(s):  
Malik Saepudin ◽  
Soeharyo Hadisaputro ◽  
Ari Suwondo ◽  
Suhartono Suhartono
Keyword(s):  
Experimental Design ◽  
Aedes Aegypti ◽  
Larval Density ◽  
Hemorrhagic Fever ◽  
Control Group ◽  
P Value ◽  
Dengue Disease ◽  
Density Index ◽  
Quasi Experimental ◽  
The Mean

Dengue Hemorrhagic Fever (DHF) is a health problem in Indonesia. The entire region of Indonesia at risk of contracting dengue disease. The study aims to prove the effect of modifications ovitrap rekattidiri on the density of larvae (HI: House Index, CI: Container Index and BI: Breteu Index) as well as comparing the differences between the mean larvae trapped between ovitrap Rekattidiri with standard ovitrap. Using a quasi experimental design, time series experimental design with Control group. Population subjects were Aedes aegypti at the endemic sites in Pontianak, West Borneo. The results showed larval density index in the intervention area decreased each ie HI from 26% to 3%, CI of 6.95% to 2.19 %, and BI from 29% to 13%. The number of larvae trapped in ovitrap rekattidiri ie 70% (12,770 larvae) more than the standard ovitrap in the control and intervention, namely: 17% (3,057 larvae) and 13% (2,334 larvae). It is concluded that there are significant modifications Rekattidiri ovitrap against larval density index (HI p-value: 0.025, CI p-value: 0.052, BI value of p: 0.04) and there are differences between the mean larvae trapped in ovitrap Rekattidiri and standard ovitrap with p value: 0.001.

I need an exact margin measurement for this basal cell carcinoma!

2021 ◽  
pp. jclinpath-2021-208030
Author(s):  
Ian Katz ◽  
Les Irwig ◽  
Kevin McGeehan ◽  
Katy Bell
Keyword(s):  
Skin Cancer ◽  
Basal Cell Carcinoma ◽  
Measurement Uncertainty ◽  
Cell Carcinoma ◽  
Basal Cell ◽  
Quantitative Results ◽  
The Mean

Background/objectivesPathology laboratories are required to determine or estimate the measurement uncertainty for all quantitative results, but there is no literature on the uncertainty in margin measurements for skin cancer excisions.MethodsSix pathologists measured 4–14 histological margins in each of 10 basal cell carcinoma.ResultsThe mean of measurements from all the margins from all the cases was 1.8 mm (range 0 and 6 mm). Regarding the overall variance in margin measurements across the ten cases, 25% was from variation within cases (differences in margin measurement for a given case, because of different margins and different pathologists measuring each margin, SD 0.7 mm). For a given case, we estimate that 95% of margin measurements would fall approximately within±1.4 mm of the mean measurement for that case. When only pathologists’ closest margin for each case were included (for the six cases with uninvolved margins), 6% of the overall variance was from differences within cases (because of different pathologists’ measurements of the closest margin, SD 0.2 mm). For a given case without an involved margin, 95% of closest margin measurements would fall approximately within±0.5 mm of the mean closest measurement for that case.ConclusionsClinicians should be aware there is uncertainty in reported histological margins.

scholarly journals Athletic Trainers' Attitudes and Perceptions of Environmental Sustainability

2017 ◽  
Vol 52 (12) ◽  
pp. 1109-1120 ◽  
Author(s):  
Kelly Potteiger ◽  
William A. Pitney ◽  
Thomas A. Cappaert ◽  
Angela Wolfe
Keyword(s):  
New York ◽  
Environmental Impact ◽  
Athletic Training ◽  
Environmental Sustainability ◽  
Athletic Trainers ◽  
Sequential Mixed Methods ◽  
Quantitative Results ◽  
The Mean ◽  
National Athletic Trainers Association ◽  
Post Hoc

Context:  Environmental sustainability efforts are becoming a critical concern in health care. However, little is known regarding how athletic trainers feel about the environment or what can be done to reduce the environmental impact of the practice of athletic training. Objective:  To examine athletic trainers' attitudes toward and perceptions of factors related to environmental sustainability. Design:  Sequential, mixed methods using a survey, focus groups, and personal interviews. Setting:  Field study. Patients or Other Participants:  Four hundred forty-two individuals completed the survey. Sixteen participated in the qualitative portion. Main Outcome Measure(s):  Quantitative results from the Athletic Training Environmental Impact Survey included data from a 5-point Likert scale (1 = lowest rating and 5 = highest rating). Descriptive statistics and 1-way analyses of variance were used to describe perceptions and determine differences in mean opinion, National Athletic Trainers' Association district, and use of green techniques. Qualitative data were transcribed verbatim and analyzed inductively. Results:  The mean score for opinion of the environment was 3.30 ± 0.52. A difference was found between opinion and National Athletic Trainers' Association district (F9, 429 = 2.43, P = .01). A Bonferroni post hoc analysis identified this difference (P = .03) between members of District 2 (Delaware, New Jersey, New York, Pennsylvania) and District 9 (Alabama, Florida, Georgia, Kentucky, Louisiana, Mississippi, Tennessee). An inductive analysis resulted in 3 emergent themes: (1) barriers to using green techniques, (2) motivators for using green techniques, and (3) solutions to overcoming the barriers. The information gleaned from participants in the qualitative portion of the study can be useful for clinicians wishing to implement basic conservation efforts in their practice settings and may guide future sustainability projects. Conclusions:  Overall, participants reported a positive opinion of environmental sustainability topics related to athletic training. However, many barriers to practicing green techniques were identified.

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