Polymorphism of the age population structure of two wild Mastomys natalensis (Rodentia: Muridae) Tanzanian habitat samples: a multicriteria comparison / Polymorphisme de la structure de l'âge dans deux populations sauvages de Mastomys natalensis (Rodentia: Muridae) de Tanzanie: une comparaison sur la base de plusieurs critères d'étude

Mammalia ◽  
2006 ◽  
Vol 70 (3/4) ◽  
Author(s):  
Aude Lalis ◽  
Emilie Lecompte ◽  
Raphaël Cornette ◽  
Sybille Moulin ◽  
Robert S. Machangu ◽  
...  
Keyword(s):  
Population Structure ◽  
Mastomys Natalensis ◽  
Age Population Structure

Ostracods as Tsunami Tracers in Holocene Sequences

2010 ◽  
Vol 73 (1) ◽  
pp. 130-135 ◽  
Author(s):  
Francisco Ruiz ◽  
Manuel Abad ◽  
Luís Miguel Cáceres ◽  
Joaquín Rodríguez Vidal ◽  
María Isabel Carretero ◽  
...  
Keyword(s):  
Population Structure ◽  
Species Diversity ◽  
Indian Ocean ◽  
High Energy ◽  
Indian Ocean Tsunami ◽  
Tsunami Deposits ◽  
Shallow Marine ◽  
Juvenile Stages ◽  
Marine Areas ◽  
Age Population Structure

This review analyses the ostracod record in Holocene tsunami deposits, using an overview of the 2004 Indian Ocean tsunami impact on its recent populations and the associated tsunamigenic deposits, together with results from numerous investigations of other Holocene sequences. Different features such as the variability of the local assemblages, population density, species diversity, age population structure (e.g., percentages of adults and juvenile stages) or taphonomical signatures suggest that these microorganisms may be included amongst the most promising tracers of these high-energy events in marshes, lakes, lagoons or shallow marine areas.

scholarly journals Comparison of Growth Parametres Between Sardine Sardina Pilchardus (Walbaum, 1792) and Anchovy Engraulis Encrasicolus (Linnaeus, 1758) from the Eastern Adriatic Sea

2020 ◽  
Vol 3 (3) ◽  
pp. 325-333
Author(s):  
Bosiljka Mustać ◽  
Gabrijela Zoja Cukar ◽  
Anita Vidović
Keyword(s):  
Population Structure ◽  
Adriatic Sea ◽  
Growth Parameters ◽  
Fish Length ◽  
Sardina Pilchardus ◽  
Age Composition ◽  
Positive Allometry ◽  
Engraulis Encrasicolus ◽  
Weight Relationship ◽  
Age Population Structure

Sardine Sardina pilchardus (Walbaum, 1792) and anchovy Engraulis encrasicolus (Linnaeus, 1758), besides being ecologically very important pelagic resources, are also the most numerous fish species in Croatian fisheries landings. Hence, the aim of this study was to compare sardine and anchovy growth parameters: length, length-weight relationship, condition and age population structure. All samples (N=3313) were collected from purse seine catches of eastern Adriatic Sea, during period June 2015 – August 2016. Total lengths of sardine and anchovy ranged from 10.5 to 17.5 cm (average ± SD: 13.94 cm ± 1.07) and from 10.0 to 17.5 cm (average ± SD: 14.09 cm ± 0.88), respectively. Both sardine and anchovy length-weight relationship indicated positive allometry, although allometric coefficient was higher in anchovy (b=3.201) than in sardine (b=3.069). In general, condition of both species grew with fish length. Sardine and anchovy age composition varied from one to five years, while most of the analysed samples belonged to the 3 year class. Growth parameters were for anchovy: L∞=18.36cm; K=0.317; t0= -1.89 and for sardine L∞=19.71 cm; K=0.286; t0= -1.82.

scholarly journals POPULATION NATURAL DYNAMICS OF YUGOSLAV HILLMOUNTAIN AREAS - THE MIDDLE BOSNIA EXEMPLAR FOR THE PERIOD 1980-1989. YEAR

1991 ◽  
Vol 35 ◽  
pp. 91-98
Keyword(s):  
Population Structure ◽  
Population Growth ◽  
Population Development ◽  
Large Area ◽  
Growth Type ◽  
Mountain Area ◽  
Three Stages ◽  
Late Transition ◽  
Natural Dynamics ◽  
Age Population Structure

The middle Bosnia is a part of the central mountain area, Yugoslav integral large area complex. According to the administrativ-political organisation it is consisting of 37 municipalities with total are 12883 km/2 (ENCLOSURE 1). During ten years studied period the middle Bosnia population is characterized by the slow pulsating (variability 3,1 prom.) low values of middle type natality (the rates were between 15,2 prom. and 18,3 prom.). Furthermore, it is noticing the slow pulsating (variability 1,0 prom.) low mortality values with the rates between 6,3 prom. and 7,3 prom. (the rates of infantile mortality after Year 1984. were low and during first four studied years were between 25,5 prom. and 32,7 prom.). The results is the slow pulsating (variability 3,5 prom.) middle values of moderate natural population growth type (the rates were between 7,9 prom.) and 11,4 prom.). According to the indicated results, as wel as considering the characteristics of middle Bosnia sex and age population structure during studied period and Its social-economics development, and as per as the three-stages model of demographics transition, that is as per as the population development charac. teristics, it is possible to conclude that the studied population is very deep in a late transition substage.

scholarly journals Demographic potential of sex-age structure as a factor of population dynamics

2019 ◽  
Vol 15 (6) ◽  
pp. 69-79
Author(s):  
Vladimir N. Arkhangelskiy ◽  
Yuliya V. Zinkina ◽  
Sergey G. Shulgin
Keyword(s):  
Population Structure ◽  
Population Growth ◽  
Natural Population ◽  
Age Structure ◽  
Natural Increase ◽  
Female Population ◽  
Retrospective Assessment ◽  
Demographic Dynamics ◽  
Demographic Potential ◽  
Age Population Structure

The study aims to assess the sex-age population structure in terms of its impact on the up-coming dynamics of natural increase and, consequently, on the general change in the population size. There are various approaches to assessing this influence, proposed and used by scientists who have studied this aspect of demographic dynamics. This article discusses a relatively simple indica-tor of the sex-age population structure, which allows estimating its future influence on the ratio of births to deaths, and on the natural population growth. The indicator proposed is the so-called demographic potential of the sex-age structure, which is the ratio of female population aged 10–39 to the population of both sexes aged 65 years and older. The number of births in the next 10–15 years largely depends on the size of the first one, while the number of deaths in this period depends on the size of the second one.Before using the demographic potential of the sex-age structure to forecast the dynamics of natural population growth, a retrospective assessment of the relation of this potential with subse-quent natural population growth should be carried out for some particular time point in the past. We chose the sex-age structure of the mid-2000s and the natural increase (per 1000 population) in 2000–2015 for such assessment, accounting for 201 countries. The high value of the correlation coefficient (0.815) indicates that the current sex-age structure and its demographic potential can be used (with varying degrees of conditionality, of course) to forecast the future dynamics of natural growth. In turn, the size of the demographic potential of the sex-age structure of the population depends on the preceding levels of fertility and mortality.An assessment of the demographic potential of the sex-age population structure in mid-2015 for 201 countries of the world showed that in a number of countries in Asia and Africa the value of this potential exceeds 10, so significant natural population growth is highly probable there in the next 10–15 years. Meanwhile, in a number of European countries the value of this potential is less than 1 (i.e., the population aged 65 years and older is larger than the female population aged 10–39 years), which is likely to result in a very small natural increase (in case of a favorable mode of pop-ulation reproduction) or even a natural decline.

Erhöhte Bildung von Plattenepithelzellkarzinomen in Mastomys natalensis Papillomvirus E6-transgenen Mäusen induziert mithilfe der Mehrstufenkarzinogenese

2003 ◽  
Vol 29 (08/09) ◽  
Author(s):  
I Helfrich ◽  
M Chen ◽  
A Kopp-Schneider ◽  
HJ Gröne ◽  
H zur Hausen ◽  
...  
Keyword(s):  
Mastomys Natalensis
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