Demography of the Porcupine caribou herd, 1983–1992

1994 ◽  
Vol 72 (5) ◽  
pp. 840-846 ◽  
Author(s):  
Steven G. Fancy ◽  
Kenneth R. Whitten ◽  
Donald E. Russell
Keyword(s):  
Survival Rate ◽  
Population Size ◽  
Computer Model ◽  
Rangifer Tarandus ◽  
Survival Rates ◽  
Annual Rate ◽  
Population Estimates ◽  
First Year ◽  
The Mean ◽  
Hunting Mortality

Population size, parturition rates, and sex- and age-specific survival rates were determined for the Porcupine caribou herd (Rangifer tarandus granti) in northeastern Alaska and northwestern Canada between 1983 and 1992. The herd increased at an annual rate of r = 0.0467 between censuses in July 1983 (n = 135 000), July 1987 (n = 165 000), and July 1989 (n = 178 000). The mean parturition rate for 225 radio-collared cows aged ≥3 years monitored for 603 reproductive attempts between 1982 and 1992 was 80% and did not differ among years. First-year survival of calves was 51%. The survival rate of calves through their first month differed among years (range 57–90%). The mean annual survival rate for ≥3-year-old caribou was 84.2% for 225 females and 82.6% for 42 males. Hunting mortality for the herd averaged 2–3% annually. Population estimates generated by a computer model using parturition and survival rates for the herd closely tracked population trends determined from photocensus data. Growth of the herd is most sensitive to the survival of females 3 years of age and older, followed by calf production and survival.

Developing a census method based on sight counts to estimate rabbit (Oryctolagus cuniculus) numbers

2003 ◽  
Vol 30 (5) ◽  
pp. 487 ◽  
Author(s):  
Dylan W. Poole ◽  
Dave P. Cowan ◽  
Graham C. Smith
Keyword(s):  
Population Size ◽  
Field Trials ◽  
Population Estimates ◽  
Economic Costs ◽  
Natural Conditions ◽  
Commercial Farms ◽  
The Mean ◽  
The Difference ◽  
Study Sites ◽  
Autumn And Winter

A rabbit-census method, based on systematic counts conducted at night or at dawn and dusk, was developed and validated in terms of estimating the total number of rabbits present in a given area. Initially, models were developed under semi-natural conditions to describe the relationships between the numbers of rabbits counted and population size. Confidence limits were also calculated. The models were developed by comparing rabbit counts with the actual number of rabbits present, from a known population of animals. Only spotlight counts at night were considered reliable enough to estimate rabbit population size. During the autumn and winter months these represented ~60% of the population present. The model was subsequently validated, in two different exercises, following a series of field trials conducted under a variety of conditions on commercial farms. Initially, population estimates derived from the model were compared with those calculated using an alternative census technique. Population estimates, using the two techniques, were very similar at nine of the ten study sites. A second validation exercise was also conducted whereby the number of rabbits removed at each of the sites was compared with the difference between the mean pre- and post-removal spotlight counts. The results further supported the proposition that spotlight counts represent ~60% of the population present, with the difference between the two mean spotlight counts representing 61.2% (± 11.0, s.d.) of the number of rabbits removed. The census method therefore shows considerable promise as a means to estimate rabbit numbers under a range of agricultural conditions and therefore has the potential to predict accurately the economic costs of rabbit damage and also to gauge the effectiveness of various methods of rabbit control.

Demography of barren-ground grizzly bears

2003 ◽  
Vol 81 (2) ◽  
pp. 294-301 ◽  
Author(s):  
Philip D McLoughlin ◽  
Mitchell K Taylor ◽  
H Dean Cluff ◽  
Robert J Gau ◽  
Robert Mulders ◽  
...  
Keyword(s):  
Survival Rate ◽  
Litter Size ◽  
Birth Interval ◽  
Ursus Arctos ◽  
Survival Rates ◽  
Grizzly Bears ◽  
Adult Males ◽  
Barren Ground ◽  
Rate Of Increase ◽  
The Mean

Between May 1995 and June 1999, we equipped 81 barren-ground grizzly bears (Ursus arctos) with satellite radio collars within a study area of 235 000 km2, centred 400 km northeast of Yellowknife, Northwest Territories, Canada. We used data from radiotelemetry to estimate survival rates, reproductive parameters, and the finite rate of increase of the population (λ). The annual survival rate of adult females was estimated at 0.979 (95% confidence intervals (CI) = 0.955–0.998), while the survival rate of adult males was 0.986 (95% CI = 0.942–1.0). The cub survival rate was 0.737 (95% CI = 0.600–0.844) and the yearling survival rate was 0.683 (95% CI = 0.514–0.821). Cub litter size averaged 2.23 (SE = 0.13, n = 35), while yearling litter size decreased to a mean of 1.86 (SE = 0.12, n = 35). The mean litter size of females with 2-year-olds was 1.85 (SE = 0.15, n = 20). The mean birth interval was 2.8 years (SE = 0.3 years, n = 17). The mean reproductive interval, which is calculated by excluding the loss of whole litters from the sample, was 3.9 years (SE = 0.4 years, n = 9). Mean litter size divided by mean birth interval yielded an annual natality rate of 0.81 cubs per adult female per year. The mean age at first parturition was 8.1 years (SE = 0.5 years, n = 10). We believe the population to be currently stable or slightly increasing (λ = 1.033, 95% CI = 1.008–1.064).

scholarly journals Short Term Outcomes of Gastric Cancer at University Teaching Hospital of Kigali (CHUK), Rwanda.

2020 ◽  
Author(s):  
Irénée Niyongombwa ◽  
Irénée David Karenzi ◽  
Isaie Sibomana ◽  
Vital Muvunyi ◽  
Jean Marie Vianney Kagimbangabo ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Survival Rate ◽  
Mortality Rate ◽  
Hospital Mortality ◽  
Cox Regression ◽  
Advanced Disease ◽  
Survival Rates ◽  
University Teaching ◽  
Short Term ◽  
The Mean

Abstract Background: Gastric cancer is the 4th most common cause of cancer death worldwide with an annual global incidence of 985,600; two thirds of them being in the developing countries. Gastric cancer is endemic in the so called stomach cancer region comprising Rwanda, Burundi, South Western Uganda and eastern Kivu province of Democratic Republic of Congo and its incidence in Rwanda is estimated around 13 to 15 per 100,000 population. To date, the outcomes of gastric cancer in the East African region are under investigated, and the survival rate in Rwanda is not known. The aim of this study was to describe the short term outcomes (in-hospital mortality rate, length of hospital stay, 3, 6, 12 and 24 months survival rates) in patients treated for gastric cancer at CHUK.Methods: We retrospectively reviewed the data collected from records of patients who consulted CHUK over a period of 10 years from September 2007 to August 2016. Patients were followed in hospital and after discharge for survival length. Descriptive statistics were used for baseline demographic data, Kaplan-Meier model and univariate cox regression were used for survival analysis.Results: Of the 199 patients enrolled in the study, 92 (46%) were males and 107 (54%) females. The mean age was 55.4 ranging between 24 and 93. The mean symptoms duration was 15 months. Most patients consulted with advanced disease, 62.3% with distant metastases. Treatment with curative intent was offered for only 19.9% of patients. The in-hospital mortality rate was 13.3%. The 3, 6, 12 and 24 months survival rate was 52%, 40.5%, 28% and 23.4% respectively. The Overall survival rate was 7 months.Conclusion: Patients with gastric cancer have delayed consultations and advanced disease at the time of presentation. This cancer is associated with poor outcomes in terms of hospital mortality and post discharge survival rates.

The 1997 Report of the Japanese National Registry Data on Pediatric Peritoneal Dialysis Patients

1999 ◽  
Vol 19 (2_suppl) ◽  
pp. 473-478 ◽  
Author(s):  
Masataka Hondaa
Keyword(s):  
Peritoneal Dialysis ◽  
Survival Rate ◽  
Survival Rates ◽  
National Registry ◽  
Catheter Survival ◽  
Technique Survival ◽  
The Mean ◽  
National Registry Data ◽  
Patient Survival Rate

Objective We have collected data on pediatric patients less than 16 years of age from the National Registry of Chronic Peritoneal Dialysis (PD). We present our experience with this population. Design The database details the patient numbers, age, outcome, cause of death, reason for terminating PD therapy, type of PD therapy, peritonitis, and catheter survival. Patients Of 807 patients, 70 patients (8.7%) were under 1 year of age, and 268 patients (33.2%) were under 6 years of age, clearly indicating that PD was the treatment of choice in young children. The duration on PD was 5 years or more in 200 patients (24.8%), which showed an increase in long-term PD patients from 11% in 1991. Patients on automated PD (APD) increased to 75% in 1997 from 9% in 1991. Results The outcomes for the total patient population of 807 as of the end of 1997 is: 253 patients (31.4%) were being successfully treated with PD, 87 patients (10.8%) died, 238 patients (29.5%) received a kidney transplant, and 121 (15.0%) were transferred to hemodialysis. The patient survival rate was 91% in 3 years and 86% in 5 years. The technique survival rate was 83% in 3 years and 71% in 5 years. The rate of peritonitis was 1 episode per 30 patient -months. The mean catheter duration was 2.25 years. Conclusion The patient and technique survival rates, the peritonitis rate, and the catheter survival improved recently. However, these data were worse in younger children (less than 6 years of age), indicating that extra-careful management is needed for this young age group.

Experience with CAPD in Diabetic Patients in Toronto

1981 ◽  
Vol 2 (1_suppl) ◽  
pp. 12-14 ◽  
Author(s):  
Clair Williams ◽  
Dale Belvedere ◽  
Daniel Cattran ◽  
Sheila Clayton ◽  
Edward Cole ◽  
...  
Keyword(s):  
Success Rate ◽  
Cause Of Death ◽  
Cardiovascular Events ◽  
Survival Rates ◽  
First Year ◽  
Diabetic Patients ◽  
Dialysis Modality ◽  
Short Term ◽  
The Mean

During the first four years of the CAPD programs in Toronto, 409 patients completed CAPD training; of these 64 (15.7%) were diahetics. The mean age of the diabetics was 46.7 and of the non-diabetics 51.4 years. One and two-year survival rates were not significantly different between the two groups (93%-82% for the non-diabetics and 90%-72% for the diabetics}. The main cause of death was cardiovascular events, in both groups. During the first year on CAPD, diabetics were transplanted at a higher rate than non-diabetics (20% vs. 9%). The overall technique success rate, the rate of transfer to an alternative dialysis modality and the incidence of peritonitis were similar in the two groups. At least in the short -term, diabetics do well on CAPD. It is suggested that CAPD may be the dialysis modality of choice in diabetics with ESRD.

Overestimation of the Effectiveness of Cardiopulmonary Resuscitation

1997 ◽  
Vol 84 (3_suppl) ◽  
pp. 1409-1410 ◽  
Author(s):  
Nathan M. Kostoulakos ◽  
Drake R. Bradley
Keyword(s):  
College Students ◽  
Survival Rate ◽  
Cardiopulmonary Resuscitation ◽  
Survival Rates ◽  
The Mean ◽  
Actual Survival

38 college students estimated the survival rates of people administered cardiopulmonary resuscitation. The mean estimated survival rate (54.5%) was significantly higher than the actual survival rate (10%).

Twenty Years of Renal Transplantation in Children

PEDIATRICS ◽  
1986 ◽  
Vol 77 (4) ◽  
pp. 465-470
Author(s):  
Donald Potter ◽  
Nicholas Feduska ◽  
Juliet Melzer ◽  
Marvin Garovoy ◽  
Susan Hopper ◽  
...  
Keyword(s):  
Overall Survival ◽  
Renal Transplantation ◽  
Survival Rate ◽  
Living Donor ◽  
Patient Survival ◽  
Survival Rates ◽  
Overall Survival Rate ◽  
Creatinine Concentration ◽  
The Mean ◽  
Cadaver Donor

Two-hundred three children 1 to 16 years of age received kidney transplants during a 20-year period, 100 from living donors and 103 from cadaver donors. The overall survival rate was 79%. Actuarial patient and kidney survival rates at 15 years were 79% and 52%, respectively, for recipients of living donor kidneys and 57% and 19%, respectively, for recipients of cadaver donor kidneys. One of two children who received transplants in 1964 was alive 20½ years later. Twenty-nine children had kidneys that had functioned more than 10 years; their mean serum creatinine concentration was 1.7 mg/dL and 24 were fully rehabilitated. Eighteen were more than 2 SD below the mean height of normal chidren, however. Comparison of survival rates during successive 5-year intervals showed significant improvement in patient survival during the 20-year period and smaller improvements in kidney survival after 1979. Patient survival after living donor transplants during the last 10 years was 100%, and kidney survival during the last 5 years was 92%. Improvement was attributed to the effect of experience, as well as to changes in immunosuppressive therapy in 1972 and the introduction of donor-specific transfusions in 1978.

Longevity and survival of the black stork Ciconia nigra based on ring recoveries

Biologia ◽  
2011 ◽  
Vol 66 (5) ◽  
Author(s):  
Enikő Tamás
Keyword(s):  
Survival Rate ◽  
Survival Rates ◽  
Present Knowledge ◽  
First Year ◽  
Previous Knowledge ◽  
Significant Difference ◽  
Ring Recoveries ◽  
Ciconia Nigra ◽  
Black Stork

AbstractTo understand population dynamics, the determination of survival rates is very important. For the black stork Ciconia nigra no survival rate determination has been published to date. This might be due to the fact that ringing activity and recovery numbers in general are still relatively low for the species. The international black stork colour ringing programme is taking place with the participation of 25 countries including Hungary. Altogether more than 7,000 black storks have been colour ringed worldwide, of which 1,069 individuals were marked in Hungary. This article’s objective is the determination of the survival rates for the black stork, as well as to estimate the longevity of the species based on live encounters of ringed individuals. The conclusions are that longevity can be estimated based on the data, and is in agreement with previous knowledge; and that the survival rate of the species, with our present knowledge, shows a significant difference between first year (0.1696, 0.1297–0.219) and older birds (0.838, 0.773–0.887).

Clinical and endoscopic aspects of metastases to the gastrointestinal tract

Endoscopy ◽  
2019 ◽  
Vol 51 (07) ◽  
pp. 646-652 ◽  
Author(s):  
Luiza Haendchen Bento ◽  
Mauricio Kazuyoshi Minata ◽  
Clelma Pires Batista ◽  
Bruno da Costa Martins ◽  
Luciano Henrique Lenz Tolentino ◽  
...  
Keyword(s):  
Survival Rate ◽  
Palliative Treatment ◽  
Survival Rates ◽  
Case Series ◽  
Gastric Body ◽  
Gi Tract ◽  
Cancer Disease ◽  
Primary Tumors ◽  
The Mean ◽  
Single Center Observational Study

Abstract Background Studies that describe metastases to the gastrointestinal (GI) tract are restricted to small case series. An increase in the frequency of this condition is expected, so it would be useful to better characterize the endoscopic aspects of metastasis to the GI tract. The aims of this study were to describe the frequency and endoscopic features of the lesions, and to analyze the survival rate after diagnosis of metastasis. Methods This was a retrospective, single-center, observational study, conducted between 2009 and 2017. Patients with metastasis to the GI tract were included. Results 95 patients were included. Melanoma (25.3 %), lung (15.8 %), and breast (14.7 %) were the most frequent primary tumors. The most common endoscopic presentation was a solitary, ulcerated lesion in the gastric body. Conventional biopsy was diagnostic in 98.9 % of the cases. The mean and median survival rates were 13.3 months (95 % confidence interval [CI] 8.2 – 18.3) and 4.7 months (95 %CI 3.7 – 5.6), respectively. Palliative treatment with chemo- and/or radiotherapy after the diagnosis of the metastasis was related to a higher survival rate. Conclusions Melanoma, lung, and breast cancer were the most common primary tumors to metastasize to the GI tract. The endoscopic features could not predict the primary site of the tumor. The finding of metastasis in the GI tract is related to the final stage of the cancer disease but patients who received palliative treatment with chemo- and/or radiotherapy after diagnosis of GI metastasis had higher survival rates.

scholarly journals Variability of demographic parameters and population dynamics of Atlantic salmon Salmo salar L. in a south-west French river

2003 ◽  
Vol 60 (2) ◽  
pp. 356-370 ◽  
Author(s):  
J. Dumas ◽  
P. Prouzet
Keyword(s):  
Survival Rate ◽  
Survival Rates ◽  
Maximum Yield ◽  
First Year ◽  
South West ◽  
Salmon Population ◽  
Second Year ◽  
First Year Of Life ◽  
French River ◽  
Good Agreement

Abstract The abundance of the salmon population in the Nivelle River was assessed for 11 cohorts during all the stages of their life cycle, from eggs to spawners. A stochastic life history model was used to simulate the changes in numbers at each stage over several years and to evaluate the parameters of a Ricker-type Stock and Recruitment (S–R) relationship. Parameters necessary for managing the exploitation of the species were also estimated. The results indicated that an average deposition of 611 700 eggs (values varying in a proportion of 1 to 3, depending on the year) produced 4870 0+ parr in autumn (variation from 1 to 5.6); 71.8% of which belonged to the group of future 1-year old smolts. The age 1+ parr were eight times less numerous. Survival from egg to 0+ parr was on average 0.97%, but highly variable (varying from 1 to 15). It was density-dependent and followed Ricker S–R model with an optimum of 7800 parr for a survival rate of 3%. During their second year, the survival of 1+ parr reached 53.4% and varied little. The adult runs of complete cohorts amounted to 196 maiden salmon (range, 88 to 382) and previous spawners comprised only 0.9% of adults. Grilse (1 year in the sea) constituted the majority (88.7%). The overall survival rates from 0+ parr to adult returns (6.2% on average) varied three-fold. The majority was females among the grilse (56.2%) and 2-sea-year salmon (88.6%); all 3-sea-year adults were female. Eggs deposited per female averaged 4200, 8500 and 12 750 eggs in each age group, respectively. Simulations of population abundances at various life stages were in good agreement with the observed data. The S–R relationship revealed the low productivity and the vulnerability of this stock, mainly due to the low survival rate of the young during their first year of life. The maximum yield of 12.2% of recruits could be obtained from a deposition of 1 424 000 eggs, which is twice the present average level.

Sign in / Sign up

Export Citation Format

Share Document