Seasonal variation in diet digestibility of pine voles

1988 ◽  
Vol 66 (6) ◽  
pp. 1484-1487 ◽  
Author(s):  
Sandra L. MacPherson ◽  
Frederick A. Servello ◽  
Roy L. Kirkpatrick
Keyword(s):  
Seasonal Variation ◽  
Seasonal Pattern ◽  
Stomach Contents ◽  
Regression Equations ◽  
Apple Orchards ◽  
Digestible Energy ◽  
Habitat Variation ◽  
Microtus Pinetorum

Seasonal and habitat variation in diet digestibility of pine voles (Microtus pinetorum) in four apple orchards was estimated using regression equations and the Van Soest analysis of stomach contents. The estimated percent digestible energy of diets in the four orchards varied from 57 to 72% during the year but a uniform seasonal pattern was not found among orchards. Weights of stomach contents declined markedly during winter in all four habitats.

A method of estimating diet digestibility in wild meadow voles

1985 ◽  
Vol 63 (5) ◽  
pp. 1020-1022 ◽  
Author(s):  
Sandra L. MacPherson ◽  
Frederick A. Servello ◽  
Roy L. Kirkpatrick
Keyword(s):  
Dry Matter ◽  
Stomach Contents ◽  
Microtus Pennsylvanicus ◽  
Meadow Vole ◽  
Regression Equations ◽  
Chemical Analyses ◽  
Meadow Voles ◽  
Digestible Energy ◽  
Microtus Pinetorum

Regression equations for estimating diet digestibility in meadow voles (Microtus pennsylvanicus) were developed using laboratory digestion trials and chemical analyses of diets and stomach contents. These equations were used to obtain estimates of the apparent digestible dry matter (DDM) and apparent digestible energy (DE) in the diets of wild meadow voles. The estimated DDM and DE in the diets of two wild meadow vole populations varied between 62.9 and 75.2% and 62.0 and 74.2%, respectively, and were similar to those reported previously for pine voles (Microtus pinetorum).

Seasonal variation in births in rural East Pakistan

1972 ◽  
Vol 4 (1) ◽  
pp. 107-116 ◽  
Author(s):  
John Stoeckel ◽  
A. K. M. Alauddin Choudhury
Keyword(s):  
Seasonal Variation ◽  
Social Factors ◽  
Seasonal Pattern ◽  
Seasonal Patterns ◽  
First Order ◽  
Monthly Temperature ◽  
Monthly Distribution ◽  
Number Of Births

SummaryAn analysis of the monthly distribution of births in two areas of Matlab Thana, East Pakistan, indicates that there is a seasonal variation in births different from what would be expected by chance. The highest proportion of births occur in the last three months of a year and the lowest proportion between May and July. Investigation into some of the environmental and social factors which might contribute to the seasonal pattern revealed the following: mean minimum monthly temperature 9 months before birth was inversely related to the number of births; all occupations had seasonal patterns different from what would be expected by chance and the business and mill-and-office occupations had distributions significantly different from each other; the distribution of births for all pregnancy orders was different from chance and the distribution for first order pregnancies was significantly different from those for third and fourth or higher orders.

scholarly journals Increase in searches for erectile dysfunction during winter: seasonal variation evidence from Google Trends in the United States

2021 ◽  
Author(s):  
Belén Mora Garijo ◽  
Jonathan E. Katz ◽  
Aubrey Greer ◽  
Mia Gonzalgo ◽  
Alejandro García López ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
United States ◽  
Erectile Dysfunction ◽  
Seasonal Variation ◽  
Kidney Stones ◽  
Seasonal Pattern ◽  
The United States ◽  
Google Trends ◽  
Internet Search ◽  
Search Volume

AbstractSeveral diseases associated with erectile dysfunction (ED), such as type 2 diabetes mellitus (T2DM) and coronary artery disease (CAD), are known to have seasonal variation, with increased incidence during winter months. However, no literature exists on whether this chronological-seasonal evolution is also present within ED symptomatology. We hypothesized ED would follow the seasonal pattern of its lifestyle-influenced comorbid conditions and exhibit increased incidence during winter months. In order to investigate the seasonal variation of ED in the United States between 2009 and 2019, Internet search query data were obtained using Google Trends. Normalized search volume was determined during the winter and summer seasons for ED, other diseases known to be significantly associated with ED (T2DM and CAD), kidney stones (positive control), and prostate cancer (negative control). There were significantly more internet search queries for ED during the winter than during the summer (p = 0.001). CAD and T2DM also had significantly increased search volume during winter months compared to summer months (p < 0.001 and p = 0.011, respectively). By contrast, searches for kidney stones were significantly increased in the summer than in the winter (p < 0.001). There was no significant seasonal variation in the relative search frequency for prostate cancer (p = 0.75). In conclusion, Google Trends internet search data across a ten-year period in the United States suggested a seasonal variation in ED, which implies an increase in ED during winter. This novel finding in ED epidemiology may help increase awareness of ED’s associated lifestyle risk factors, which may facilitate early medical evaluation and treatment for those at risk of both ED and cardiovascular disease.

scholarly journals Mucormycosis in the Eastern Mediterranean: a seasonal disease

2005 ◽  
Vol 134 (2) ◽  
pp. 341-346 ◽  
Author(s):  
M. R. AL-AJAM ◽  
A. R. BIZRI ◽  
J. MOKHBAT ◽  
J. WEEDON ◽  
L. LUTWICK
Keyword(s):  
Seasonal Variation ◽  
Fungal Infection ◽  
Pulmonary Infection ◽  
Pattern Analysis ◽  
Eastern Mediterranean ◽  
Seasonal Pattern ◽  
Atmospheric Concentration ◽  
Tel Aviv ◽  
Significant Seasonal Variation ◽  
Immunocompromised Hosts

Mucormycosis is a fairly rare fungal infection caused by ubiquitous fungi of the order Mucorales and primarily affects immunocompromised hosts. A series of 16 cases of invasive mucormycosis admitted to three referral centres in Beirut, Lebanon between 1981 and 1999 is described. It includes 12 patients with rhinocerebral, three with cutaneous, and one with pulmonary infection. Onset of symptoms occurred in the summer and autumn in 15 out of 16 patients, showing a statistically significant seasonal variation (P=0·007) A recent report of 19 patients from Tel Aviv describes a strikingly similar seasonal pattern. Studies on atmospheric concentration of Mucorales spores in the Eastern Mediterranean are lacking. Weather pattern analysis in Beirut revealed clustering of onset of invasive mucormycosis at the end of a dry, warm period, which begins around May and ends in October. Mucormycosis incidence appears to be seasonal in the Eastern Mediterranean.

scholarly journals Occurrence of suicide and seasonal variation

1998 ◽  
Vol 32 (5) ◽  
pp. 408-412 ◽  
Author(s):  
Pedro Retamal C. ◽  
Derek Humphreys
Keyword(s):  
Seasonal Variation ◽  
Statistical Analysis ◽  
Southern Hemisphere ◽  
Suicide Rate ◽  
Seasonal Pattern ◽  
Suicide Rates ◽  
The North ◽  
Political Center

OBJECTIVE: To review the estimated suicide rates for the Region Metropolitan, the main socio-political center in Chile, for the period 1979-1994, and to determine whether they follow a seasonal pattern. METHOD: Data available for the period 1979-94 at the Forensic Services in Chile was analyzed using ANOVA. RESULTS: It was register 5.386 suicides. While the "warm" months (October, November, December & January) concentrated 39.0% of cases, the so called "cold" months reported 28,7%. This contrast is made even clearer by the month-to-month analysis, showing the highest suicide rate in December (10.9%) against the lowest rate in June (7.0%). Further statistical analysis revealed these differences to be significant. CONCLUSION: The study shows that in Chile, representing as it does the Southern Hemisphere, the suicide rates tend to present a seasonal variation as has elsewhere been determined for in the North Hemisphere.

Seasonal Variation in Serum 25-Hydroxy Vitamin D3 Does Not Affect 1,25-Dihydroxy Vitamin D

1994 ◽  
Vol 31 (1) ◽  
pp. 31-34 ◽  
Author(s):  
T J Hine ◽  
N B Roberts
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Reference Range ◽  
Seasonal Pattern ◽  
Individual Variability ◽  
Dihydroxyvitamin D ◽  
1,25 Dihydroxyvitamin D ◽  
25 Hydroxy Vitamin D ◽  
Time Periods ◽  
Sunlight Hours

The seasonal variation of serum 25-hydroxy vitamin D3 and 1,25-dihydroxyvitamin D has been investigated. Blood was taken from 27 healthy volunteers, aged 21–44 years old at 3 monthly intervals over a period of 1 year. A scrolling monthly programme with 12 quarterly (3 month) time periods was developed. A summer associated increase in 25-hydroxy vitamin D3 was significantly correlated with but lagged behind by 2 months, the increase in recorded sunlight hours. However, four individuals showed no seasonal rise but maintained constant concentrations throughout the year within the established reference range. Serum 1,25-dihydroxy vitamin D showed marked intra-individual variability with no seasonal pattern although the highest concentration (180 pmol/L) was observed in the winter and no concentration greater than 108 pmol/L in the summer.

scholarly journals Linking Climate, Basin Morphology and Vegetation Characteristics to Fu’s Parameter in Data Poor Conditions

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2333 ◽  
Author(s):  
Dario Ruggiu ◽  
Francesco Viola
Keyword(s):  
Water Balance ◽  
Potential Evapotranspiration ◽  
Seasonal Pattern ◽  
Computational Effort ◽  
Model Parameters ◽  
Large Set ◽  
Regression Equations ◽  
Water Balance Components ◽  
Water Partitioning

The prediction of long term water balance components is not a trivial issue, even when empirical Budyko’s type approaches are used, because parameter estimation is often hampered by missing or poor hydrological data. In order to overcome this issue, we provided regression equations that link climate, morphological, and vegetation parameters to Fu’s parameter. Climate is here defined as a specific seasonal pattern of potential evapotranspiration and rain: five climatic scenarios have been considered to mimic different conditions worldwide. A weather generator has been used to create stochastic time series for the related climatic scenario, which in turn has been used as an input to a conceptual hydrological model to obtain long-term water balance components with low computational effort, while preserving fundamental process descriptions. The morphology and vegetation’s role in determining water partitioning process has been epitomized in four parameters of the conceptual model. Numerical simulations explored a large set of basins in the five climates. Results show that climate superimposes partitioning rules for a given basin; morphological and vegetation watershed properties, as conceptualized by model parameters, determine the Fu’s parameter within a given climate. A sensitive analysis confirmed that vegetation has the most influencing role in determining water partitioning rules, followed by soil permeability. Finally, linear regressions relating basin characteristics to Fu’s parameter have been obtained in the five climates and tested in a basin for each case, obtaining encouraging results. The small amount of data required and the very low computational effort of the method make this approach ideal for practitioners and hydrologists involved in annual runoff assessment.

scholarly journals Seasonal Variation of Achilles Tendon Injury

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0017
Author(s):  
Jon-Michael Caldwell ◽  
Harry Lightsey ◽  
Hasani Swindell ◽  
Justin Greisberg ◽  
J. Turner Vosseller
Keyword(s):  
Seasonal Variation ◽  
Achilles Tendon ◽  
Tendon Rupture ◽  
Seasonal Pattern ◽  
Achilles Tendon Rupture ◽  
Tendon Injury ◽  
Categorical Variables ◽  
Continuous Variables ◽  
Significant Difference ◽  
Tendon Ruptures

Category: Sports Introduction/Purpose: Achilles tendon ruptures are increasingly common injuries. There are several known risk factors for Achilles tendon rupture, although little is reported on the seasonal variation of the incidence of these injuries. Of the few studies in the literature touching on this question, the results have been varied. We sought to determine if there is any seasonal pattern of Achilles tendon ruptures. Knowledge of such a seasonal pattern could be advantageous for patient education, risk assessment, and ultimately prevention of these injuries. Methods: We queried billing records for CPT codes 27650, 27652, and 27654 as well as ICD diagnosis codes 727.67, 845.09, and S86.01x pertaining to Achilles tendon injury, repair, and reconstruction. Charts were screened and included if the patient suffered an acute Achilles tendon rupture on a known date. Charts were excluded if the patient had a chronic Achilles tear or underwent reconstruction or debridement for tendonitis, Haglunds deformity, tendon laceration, or any other indication aside from acute rupture. Data was analyzed using a chi-squared test for categorical variables, binomial tests for dichotomous variables and Mann-Whitney-U or Welch t-test for continuous variables. Significance was set at p < 0.05. Results: Our search yielded 499 cases with 245 meeting inclusion criteria. Sixty-six percent (66%) of injuries were identified as sports-related while 34% were non-sports related. When stratified by month, significant peaks occurred in April and July (p = .036, .011 respectively) with significantly fewer injuries occurring in October through December (p = 0.049). The highest rate of injury was seen in Spring (p = .015) and the lowest was seen in Fall (p < .001). There was no significant difference between seasons when only the non-sports related injuries were considered. Basketball was the most common sport involved (n=78) accounting for 51% of injuries (p < .001), followed by soccer and tennis. There was no significant variation between seasons in any particular sport. Conclusion: There was significant seasonal variation in the incidence of Achilles tendon ruptures. Both sports and non-sports-related injuries followed a similar pattern, with most injuries occurring during the Spring and Summer and fewer during Fall and Winter. This increase corresponds to the increase in activity in the recreational athlete population in the region which is often preceded by a time of relative inactivity. Our study confirms that the deconditioned athlete is at particularly elevated risk for Achilles tendon rupture during the Spring season when abrupt increases in sporting activity are common. Targeted education and prevention efforts could help mitigate this risk.

scholarly journals Diet and niche breadth and overlap in fish communities within the area affected by an Amazonian reservoir (Amapá, Brazil)

2014 ◽  
Vol 86 (1) ◽  
pp. 383-406 ◽  
Author(s):  
JÚLIO C. SÁ-OLIVEIRA ◽  
RONALDO ANGELINI ◽  
VICTORIA J. ISAAC-NAHUM
Keyword(s):  
Community Structure ◽  
Seasonal Variation ◽  
Fish Species ◽  
Niche Breadth ◽  
Null Model ◽  
Stomach Contents ◽  
Physical Conditions ◽  
River Damming ◽  
Standard Configuration ◽  
Feeding Resources

We investigated the niche breadth and overlap of the fish species occurring in four environments affected by the Coaracy Nunes reservoir, in the Amapá Brazilian State. Seasonal samples of fishes were taken using a standard configuration of gillnets, as well as dragnets, lines, and castnets. Five hundred and forty stomach contents, representing 47 fish species were analyzed and quantified. Niche breadth and overlap were estimated using indexes of Levins and Pianka, respectively, while interspecific competition was evaluated using a null model (RA3). ANOVA and the KruskalWallis test were used, respectively, to evaluate differences in niche breadth and overlap between areas. The data indicate that the majority of the fish species belong to the piscivore, omnivore, and detritivore guilds. These species have likely colonized the environments due to the availability of suitable feeding resources, and the favorable physical conditions created by the river damming. Overall, few species have ample niches, but most of them are highly specialized. Resources seasonal variation had little effect on the feeding behavior of most species in the study areas. The null models indicated that competition was not a factor determining on community structure.

Seasonal Variation In the Occurrence of Venous Thromboembolism In Canada

Blood ◽  
2010 ◽  
Vol 116 (21) ◽  
pp. 5120-5120
Author(s):  
Dimple Kondal ◽  
Vicky Tagalakis ◽  
Antonio Ciampi ◽  
Susan Kahn
Keyword(s):  
Seasonal Variation ◽  
Venous Thromboembolism ◽  
Research Funding ◽  
Large Scale ◽  
Hospital Admissions ◽  
Seasonal Pattern ◽  
Statistical Significance ◽  
Discharge Diagnosis ◽  
Discharge Data ◽  
Significant Difference

Abstract Abstract 5120 Background. The evidence in support of a seasonal variation in the occurrence of venous thromboembolism (VTE) is conflicting and based on studies of mostly small or moderate size, often single centered and moreover, have never included data from Canada which has clearly-defined seasons with wide temperature differences between winter and summer months. Objectives. We used discharge data from a population-level hospital registry to assess the occurrence of a seasonal pattern in hospital admissions with VTE (deep vein thrombosis (DVT) or pulmonary embolism (PE)), DVT alone and PE alone in the province of Quebec, Canada. Methods. Using data from the province of Quebec's hospital discharge database (Med-Echo) which systematically records information on all hospital admissions in Quebec since 1967, we constructed a retrospective cohort of all individuals who had a first-time discharge diagnosis of DVT or PE between January 1, 1996 and December 31, 2004 and no prior discharge diagnosis for DVT or PE back to 1983. DVT and PE were defined based on the International Classification of Diseases, 9th edition, Clinical Modification. VTE cases were grouped according to season and month of occurrence, and statistical significance of seasonal variation was determined using the Edwards' and Walter & Elwood test. Results. The cohort comprised of 45,588 (26,076 (57%) women and 19,512 (43%) men) admitted patients with incident VTE. The mean age was 62.5 years (SD 17.6) and 26,537 (58%) patients had DVT alone, 12,758 (28%) had PE alone and 6,239 (14%) had DVT with PE. Data by season showed a statistically significant difference with the lowest proportion of hospital VTE admissions in summer months (24.1%) and highest in winter (25.9%) months (p<0.0001). Seasonal variation in number of admissions by month was statistically significant for PE alone (p=0.0084; adjusted for total number of monthly hospital admissions for the Quebec province) with peak occurrence in November-December. There was no seasonal variation in monthly VTE (p=0.12) and DVT alone (p=0.87) admissions. Conclusion. Our large-scale population study provides evidence that in Quebec, Canada there is a seasonal variation in PE hospital admissions with an annual autumn peak. The underlying pathophysiologyic mechanisms are unknown and deserve further study. Disclosures: Tagalakis: Pfizer: Research Funding; Sanofi Aventis: Honoraria. Kahn:Sigvaris: Research Funding; sanofi-aventis: Advisory Board, Research Funding; Boehringer Ingelheim:.

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