scholarly journals Population drivers of aThalia democraticaswarm: insights from population modelling

2015 ◽  
Vol 37 (5) ◽  
pp. 1074-1087 ◽  
Author(s):  
Natasha Henschke ◽  
James A. Smith ◽  
Jason D. Everett ◽  
Iain M. Suthers
Keyword(s):  
Population Modelling

The population modelling of fallow deer and wild boar in a Mediterranean ecosystem

1996 ◽  
Vol 88 (1-2) ◽  
pp. 7-14 ◽  
Author(s):  
S. Focardi ◽  
S. Toso ◽  
E. Pecchioli
Keyword(s):  
Wild Boar ◽  
Fallow Deer ◽  
Mediterranean Ecosystem ◽  
Population Modelling

scholarly journals A Population Modelling Approach to Studying Age-Related Effects on Excitation-Contraction Coupling in Human Cardiomyocytes

2019 ◽  
Author(s):  
Arsenii Dokuchaev ◽  
Svyatoslav Khamzin ◽  
Olga Solovyova
Keyword(s):  
Experimental Data ◽  
Transient Outward Current ◽  
Model Parameters ◽  
Maximal Velocity ◽  
Population Modelling ◽  
Individual Parameter ◽  
Human Cardiomyocytes ◽  
Age Related ◽  
Age Related Changes ◽  
Modelling Approach

AbstractAgeing is the dominant risk factor for cardiovascular diseases. A great body of experimental data has been gathered on cellular remodelling in the Ageing myocardium from animals. Very few experimental data are available on age-related changes in the human cardiomyocyte. We have used our combined electromechanical model of the human cardiomyocyte and the population modelling approach to investigate the variability in the response of cardiomyocytes to age-related changes in the model parameters. To generate the model population, we varied nine model parameters and excluded model samples with biomarkers falling outside of the physiological ranges. We evaluated the response to age-related changes in four electrophysiological model parameters reported in the literature: reduction in the density of the K+ transient outward current, maximal velocity of SERCA, and an increase in the density of NaCa exchange current and CaL-type current. The sensitivity of the action potential biomarkers to individual parameter variations was assessed. Each parameter modulation caused an increase in APD, while the sensitivity of the model to changes in GCaL and Vmax_up was much higher than to those in the effects of Gto and KNaCa. Then 60 age-related sets of the four parameters were randomly generated and each set was applied to every model in the control population. We calculated the frequency of model samples with repolarisation anomalies (RA) and the shortening of the electro-mechanical window in the ageing model populations as an arrhythmogenic ageing score. The linear dependence of the score on the deviation of the parameters showed a high determination coefficient with the most significant impact due to the age-related change in the CaL current. The population-based approach allowed us to classify models with low and high risk of age-related RA and to predict risks based on the control biomarkers.

Reproductive synchrony of three sympatric species of wobbegong shark (genus Orectolobus) in New South Wales, Australia: reproductive parameter estimates necessary for population modelling

2007 ◽  
Vol 58 (8) ◽  
pp. 765 ◽  
Author(s):  
Charlie Huveneers ◽  
Terence I. Walker ◽  
Nicholas M. Otway ◽  
Robert G. Harcourt
Keyword(s):  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
Sympatric Species ◽  
Parameter Estimates ◽  
Reproductive Parameters ◽  
Population Modelling ◽  
Male Population ◽  
Total Length ◽  
South Wales

Reproductive parameters of three closely-related sympatric species of wobbegong (Orectolobus ornatus, O. maculatus and O. halei) off New South Wales (NSW) were investigated to contribute to a biological basis for the management of a commercial fishery targeting wobbegongs. Estimates of the onset of maturity based on ovary condition were 729 mm, 1117 mm, and 1591 mm total length (TL) for O. ornatus, O. maculatus and O. halei respectively. The length at which 50% of the male population is mature based on clasper calcification was 803 mm, 1282 mm and 1784 mm TL for O. ornatus, O. maculatus and O. halei, respectively, and was similar to female onset of maturity based on uterus condition and to TL-at-maternity. These species of wobbegong had synchronous, triennial reproductive cycles. Follicles took 2 years to enlarge before ovulation. During the first year, follicles remained small, and then grew rapidly during the second year before ovulation during November. Gestation lasted ~10–11 months and parturition occurred during September–October. Mean litter sizes were nine (s.e. 0.5) and 21 (s.e. 1.5) for O. ornatus and O. maculatus, respectively, and increased with female total length in O. ornatus. Pregnant O. ornatus and O. maculatus were frequently caught in northern NSW and no pregnant wobbegongs, or females with large, yolky follicles were captured south of Sydney. Differences in the reproductive conditions of wobbegongs caught in northern and central NSW suggested geographically dependent reproductive behaviour. Knowledge of the reproductive parameters provided in this paper is necessary for adequate fisheries management and species conservation assessments.

Ecology of black beetle,Heteronychus arator(Coleoptera: Scarabaeidae) - population modelling

1981 ◽  
Vol 24 (1) ◽  
pp. 99-105 ◽  
Author(s):  
P.D. King ◽  
C.F. Mercer ◽  
J.S. Meekings
Keyword(s):  
Population Modelling

GPA

2013 ◽  
pp. 144-169
Author(s):  
Jeremy T. Bradley ◽  
Marcel C. Guenther ◽  
Richard A. Hayden ◽  
Anton Stefanek
Keyword(s):  
Performance Analysis ◽  
State Of The Art ◽  
Large Population ◽  
Population Models ◽  
Population Modelling ◽  
Solution Methods

This chapter discusses the latest trends and developments in performance analysis research of large population models. In particular, it reviews GPA, a state-of-the-art Multiformalism, Multisolution (MFMS) tool that provides a framework for the implementation of various population modelling formalisms and solution methods.

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