scholarly journals Ukuran Kelompok Simpai (Presbytis Melalophos) Di Hutan Desa Cugung Kesatuan Pengelolaan Hutan Lindung Model Gunung Rajabasa Lampung Selatan

2015 ◽  
Vol 3 (3) ◽  
pp. 11
Author(s):  
Cindy Yoeland Violita ◽  
Agus Setiawan ◽  
Elly Lestari Rustiati
Keyword(s):  
Population Structure ◽  
Forest Management ◽  
Group Size ◽  
Natural Habitat ◽  
Reproductive Age ◽  
Presbytis Melalophos ◽  
Unit Model ◽  
Key Word ◽  
Method Group ◽  
Size And Structure

Cugung forest managed by Protection Forest Management Unit Model (KPHL) of Rajabasa Mountain, its a natural habitat for simpai (Presbytis melalophos). Its size and structure are not known. Research was done to observe its group size and population structure in Cugung forest using concentration count method. Group size was 11 individuals, with 4 reproductive age and 5 young individuals and 2 infants. Sexual ratio is 1:2.Key word: simpai, group size, a cugung forest

scholarly journals Group size and aquatic vegetation modulates male preferences for female shoals in wild zebrafish, Danio rerio

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aditya Ghoshal ◽  
Anuradha Bhat
Keyword(s):  
Group Size ◽  
Aquatic Vegetation ◽  
Natural Habitat ◽  
Ecological Factors ◽  
Choice Test ◽  
Female Group ◽  
Aquatic Flora ◽  
In The Wild ◽  
The Individual

AbstractShoaling decisions in the wild are determined by a combination of innate preferences of the individual along with the interplay of multiple ecological factors. In their natural habitat as well as in the laboratory, zebrafish is a shoaling fish. Here, we investigate the role of group size and associated vegetation in shaping shoaling preferences of wild male zebrafish. We studied the association preference of males to groups of female shoals in a multi-choice test design. We found that males made greater proportion of visits to an 8-female group compared to 2 and 4-female groups. However, males spent similar proportions of time across the three female-containing groups. When artificial vegetation was incorporated along with female number as an additional factor, we found that males prefer high and moderately vegetated patches compared to low or no-vegetation groups, irrespective of the number of females in these patches. Based on experiments using a novel multi-choice design, our results show that preference for group size can change due to interaction of two separate factors. This work is a first attempt to understand the role of aquatic flora in determining shoaling preferences in zebrafish, using an experimental paradigm consisting of a gradation in female and vegetation densities.

scholarly journals Statistical Estimation of Modern Trends and Prospects of the Size and Structure Population of Ukraine

2017 ◽  
pp. 65-72
Author(s):  
Z. О. Palian ◽  
I. H. Bondarenko
Keyword(s):  
Population Size ◽  
Age Structure ◽  
Structural Changes ◽  
Age Groups ◽  
Natural Increase ◽  
Reproductive Age ◽  
Structural Factors ◽  
Forecast Horizon ◽  
The Crimea ◽  
Size And Structure

A balanced change in demographic processes should be considered as a prerequisite and, at the same time, as a result of the stable development of the state. Reproduction intensity depends not only on the character of demographic behavior, but also on the presence of contingents of the population, providing or potentially able to provide for its replacement. The dynamics of Ukrainian population, the transformation of its gender-age structure during the period of independence, taking into account the intensive and structural factors of natural increase and migration, is considered. During 2002-2015, the regime of survival and fertility improved in Ukraine, due to which the depopulation slowed down somewhat. But even these positive changes do not compensate for the loss of population size as a result of systematic aging, reducing the proportion of reproductive contingent and its aging. Significant demographic losses, direct and indirect, were caused by a hybrid war from Russia. Alienation of the territory of the Crimea and parts of Donbas is not only a minus 2.5 million citizens of Ukraine. This is a change in the structure of the population - a decrease in the proportion of older age groups that increase the demographic load and worsen the characteristics of survival and fertility of the maternal generation. In this work are presented the results of the short-term simulation of population size and structure taking into account modern trends of replacements components and existing administrative-territorial changes. Two scenarios of the forecast for 2018 have been developed, and the base year it was taken in 2013, when the Crimea was part of Ukraine. The first, realistic scenario was based on the preservation of the current situation - Ukraine without the annexed Crimea and the occupied part of the Donbas. The second scenario imitates the return to Ukraine of all the lost territories. Simulation showed that the population of Ukraine will be reduced by both scenarios, but to 41.9 million people under the scenario without the occupied and annexed territories and to 44.7 million people in the second scenario. The finish of war will due to slow down the death rate to 14.9%0. The age structure of the population does not differ significantly in two scenarios, because the forecast horizon is very short (4 years). The share of generation of parents and women of reproductive age in both variants of the forecast decreases. However, in the case of returning Crimea, it will be even lower (47.4% vs. 47.5% in the first scenario). The reason for this is the emigration of young and middle-aged people to the mainland of Ukraine and to the Russian Federation, which provided some preferences to the settlers from Ukraine. Expected structural changes combined with the modern life and fertility regime will worsen natural population growth rates in both scenarios. In further research is planned to build trend models of births and deaths that will allow the artificially restore the interrupted time series due to administrative-territorial incomparability of data on demographic events

scholarly journals Towards a Characterization of Working Forest Conservation Easements in Georgia, USA

Forests ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 635 ◽  
Author(s):  
Tyler Reeves ◽  
Bin Mei ◽  
Jacek Siry ◽  
Pete Bettinger ◽  
Susana Ferreira
Keyword(s):  
Land Use ◽  
Forest Management ◽  
Forest Conservation ◽  
Natural Habitat ◽  
Bottomland Hardwoods ◽  
Conservation Easements ◽  
Management Activity ◽  
Land Use Types ◽  
Conservation Values ◽  
Food Plots

We examine the attributes of working forest conservation easements in Georgia. Easement contracts and baseline reports are inspected to investigate easement themes, land use types, recreation opportunities, hydrological features, and forest management activity. Easement themes are heavily weighted towards themes of protecting natural habitat and preserving the conservation values of properties. Predominant land use types include wildlife food plots, bottomland hardwoods, and planted pine stands. Common hydrological features found were small creeks/streams and ponds. Lastly, forest management was characterized as having small amounts of restrictions present, with forest management being largely similar to other unencumbered property in the southeastern USA. This information can be used as a reference for landowners interested in establishing a working forest conservation easement (WFCE) on their property as well as a tool for comparison for researchers investigating easement characteristics in other regions.

scholarly journals Fertility as a constraint on group size in African great Apes

2019 ◽  
Author(s):  
R I M Dunbar
Keyword(s):  
Group Size ◽  
Environmental Effects ◽  
Social Groups ◽  
Great Apes ◽  
Adult Females ◽  
African Great Apes ◽  
Cognitive Cost ◽  
Size And Structure ◽  
Do So ◽  
The Way

Abstract Gorillas and chimpanzees live in social groups of very different size and structure. Here I test the hypothesis that this difference might reflect the way fertility maps onto group demography as it does in other Catarrhines. For both genera, birth rates and the number of surviving offspring per female are quadratic (or ∩-shaped) functions of the number of adult females in the group, and this is independent of environmental effects. The rate at which fertility declines ultimately imposes a constraint on the size of social groups that can be maintained in both taxa. The differences in group size between the two genera seem to reflect a contrast in the way females buffer themselves against this cost. Gorillas do this by using males as bodyguards, whereas chimpanzees exploit fission–fusion sociality to do so. The latter allows chimpanzees to live in much larger groups without paying a fertility cost (albeit at a cognitive cost).

scholarly journals Non-Inverse J - shaped population distribution: Peculiarity of Red Sanders forests

2018 ◽  
Vol 10 (2) ◽  
pp. 11356
Author(s):  
S. Suresh Ramanan ◽  
T. K. Kunhamu
Keyword(s):  
Population Structure ◽  
Andhra Pradesh ◽  
Population Distribution ◽  
Natural Habitat ◽  
Wildlife Sanctuary ◽  
Pterocarpus Santalinus ◽  
Red Sanders ◽  
Density Population

Response to the published article "A study on the density, population structure and regeneration of Red Sanders (Pterocarpus santalinus) (Fabales: Fabaceae) in a protected natural habitat of Sri Lankamalleswara Wildlife Sanctuary, Andhra Pradesh, India" by Ankalaiah et al. 2017. 

CERTAIN TRENDS IN DEMOGRAPHIC DEVELOPMENT OF RURAL AREAS IN THE XXI CENTURY

2020 ◽  
Vol 66 (6) ◽  
pp. 8-8
Author(s):  
A.Yu. Senchenko ◽  
◽  
V.F. Kapitonov ◽  
Keyword(s):  
Population Structure ◽  
Rural Areas ◽  
Birth Rate ◽  
The State ◽  
Reproductive Age ◽  
Demographic Development ◽  
Krasnoyarsk Region ◽  
Working Age ◽  
Working Age Population

Implementation of the "Concept of demographic policy of the Russian Federation for the period until 2025" and Priority national projects in health and demography helped to reduce mortality and increase birth rate. However, these processes in rural areas had their own characteristics due to the long-term systemic crisis. Purpose: to assess the state and trends in demographic development of the rural district of the Krasnoyarsk region. Material and methods. The paper uses data of the State statistics for the period 2010-2018. The main demographic indicators of the Nizhneingashsky district of the Krasnoyarsk region were studied: population size, population structure by age and gender, birth and death rates. Results. The district population has a long-term sustainable tendency towards decreasing (15.9% during the study period). It is mainly due to the migration outflow of the working – age population, the size of which decreased by 24.6 %. The district mortality rate is high (16.7‰), however, during the study period it has dropped by 30.3 %. There is an ongoing tendency towards reduction in the share of people of working ages (up to 55.9%) in the population structure, primarily due to moving to other territories, and increase in the share of the elderly and senile (up to 23.9%), which makes it possible to classify this area as the one with a very high level of demographic old age population. Analysis of indicators of the special birth rate F allows us to characterize it as low (˂ 64‰). The growth rate of this indicator added up to 20.9 % in 2013 compared to 2010, while it decreased by 45.9% from 2013 to 2018. From 2010 to 2017, the total birth rate in the Nizhneingashsky district decreased by -1.02‰ (∆b), or 7.5 %. Conclusion. The ongoing decline in the share of fertile females is the main demographic factor that has spurred the decline in the birth rate since 2013. Opening new jobs in the district will stimulate the influx of people from other territories as well as reduce the migration outflow of the working-age population, rather increasing the population then just preserving its size. Increase in the share of the working-age population of reproductive age will contribute to the increased birth rate, because it is traditionally higher in rural areas. Improving demographic situation in the district requires development of socio-economic measures aimed at stimulating the birth of the third and subsequent children.

Nest excavation in ants: group size effects on the size and structure of tunneling networks

2004 ◽  
Vol 91 (12) ◽  
pp. 602-606 ◽  
Author(s):  
J�r�me Buhl ◽  
Jacques Gautrais ◽  
Jean-Louis Deneubourg ◽  
Guy Theraulaz
Keyword(s):  
Group Size ◽  
Size Effects ◽  
Nest Excavation ◽  
Size And Structure

scholarly journals Population structure of Cotylelobium melanoxylon within vegetation community in Bona Lumban Forest, Central Tapanuli, North Sumatra, Indonesia

2019 ◽  
Vol 20 (6) ◽  
Author(s):  
ARIDA SUSILOWATI ◽  
HENTI HENDALASTUTI RACHMAT ◽  
DENI ELFIATI ◽  
CUT RIZLANI KHOLIBRINA ◽  
YOSIE SYADZA KUSUMA ◽  
...  
Keyword(s):  
Population Structure ◽  
Diversity Index ◽  
Natural Habitat ◽  
Line Transect ◽  
Growth Stages ◽  
Mature Trees ◽  
Vegetation Community ◽  
Regeneration Status ◽  
In The Wild ◽  
North Sumatra

Abstract. Susilowati A, Rachmat HH, Elfiati D, Kholibrina CR, Kusuma YS, Siregar H. 2019. Population structure of Cotylelobium melanoxylon within vegetation community in Bona Lumban Forest, Central Tapanuli, North Sumatra, Indonesia. Biodiversitas 20: 1681-1687. In many forests stand, Cotylelobium melanoxylon is hard to find in the wild at present day because its bark has been intensively harvested for traditional alcoholic drink and sold by kilogram in traditional market in North Sumatra and Riau. This activity has put the species into serious threats of their existence in their natural habitat. We conducted study to determine the population structure of the species at seedling to tree stage in Bona Lumban Forest, Central Tapanuli. We used purposive sampling by making line transect at forest area where C. melanoxylon naturally grow. There were four transects with each transect consisted of five plots in which nested plots were established to record data at four growth stages, resulting in 80 plots in total. The result showed that the Important Value Index (IVI) for C. melanoxylon were 66.33, 17.65, 11.82, 12.90; Diversity Index (H) were 2.9, 1.90,2.88, 2.53 and 12.90, Index of evenness (E) were 0.844, 0.534, 0.85, 0.935 and the Index of Richness (R) were 5.71, 7.13, 5.37, 3.67 for the stage tree, pole, sapling, and seedlings, respectively This result demonstrates that C. melanoxylon still grows naturally in Bona Lumban at all stages from tree to seedling. However, there might be a problem in its natural regeneration as there is big difference of its high IVI at tree stage compared to IVI value for its younger stages. The regeneration status of C. melanoxylon was also classified into fair. This might be generated from the condition that the existing mature trees remaining were no longer productive and healthy due to excessive harvesting for its bark.

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