scholarly journals Population dynamics of reindeer

Rangifer ◽  
1990 ◽  
Vol 10 (3) ◽  
pp. 151 ◽  
Author(s):  
L. M. Baskin
Keyword(s):  
Population Dynamics ◽  
Biological Rhythms ◽  
Migration Routes ◽  
Social Attraction ◽  
Green Vegetation ◽  
The Common ◽  
And Migration ◽  
Old Females ◽  
Formation Of Groups ◽  
Dynamics Of Populations

Five types of reindeer populations are distinguished in terms of population dynamics, population density, social structure and migration distance. Differences in the biological rhythms of the populations result in calving occuring 20 days before snow melting in all populations as well as maximal utilization by the deer of young green vegetation in summer. The growth of antlers may serve as a regulatior of biological rhytms. Populations differ in the level of social motivation. Formation of groups of not less than 30-35 animals ensures cooperative protection from insects and management of the group by man. The fidelity to the calving sites, summer ranges and constant migration routes is based on the common orientation reactions of the animals and social attraction. The direction and migration routes are detemined by obligate learning. The dynamics of populations depends on the fertility of 2 and 3 year old females which is determined by feeding conditions in summer and the activity of males during the rut. Migration plays an important role in the population dynamics.

scholarly journals Contested borders: organized crime, governance, and bordering practices in Colombia-Venezuela borderlands

2020 ◽  
Author(s):  
Viviana García Pinzón ◽  
Jorge Mantilla
Keyword(s):  
Organized Crime ◽  
Border Studies ◽  
Transnational Organized Crime ◽  
Spatial Category ◽  
Criminal Organizations ◽  
The Common ◽  
Migration Flows ◽  
And Migration ◽  
Social Orders ◽  
Depth Interviews

Abstract Based on the conceptualizations of organized crime as both an enterprise and a form of governance, borderland as a spatial category, and borders as institutions, this paper looks at the politics of bordering practices by organized crime in the Colombian-Venezuelan borderlands. It posits that contrary to the common assumptions about transnational organized crime, criminal organizations not only blur or erode the border but rather enforce it to their own benefit. In doing so, these groups set norms to regulate socio-spatial practices, informal and illegal economies, and migration flows, creating overlapping social orders and, lastly, (re)shaping the borderland. Theoretically, the analysis brings together insights from political geography, border studies, and organized crime literature, while empirically, it draws on direct observation, criminal justice data, and in-depth interviews.

scholarly journals Cryptic speciation in the Warbling Vireo (Vireo gilvus)

The Auk ◽  
2021 ◽  
Author(s):  
Scott F Lovell ◽  
M Ross Lein ◽  
Sean M Rogers
Keyword(s):  
Contact Zone ◽  
Nuclear Dna ◽  
Biological Species ◽  
Valid Species ◽  
Migration Routes ◽  
Dna Evidence ◽  
Show Evidence ◽  
And Migration ◽  
Surrounding Areas ◽  
Taxonomic Groups

Abstract Eastern (Vireo gilvus gilvus) and western (V. g. swainsoni) forms of the Warbling Vireo have essentially allopatric breeding ranges across north-central North America, but come into contact in central Alberta, Canada. In 1986, Jon Barlow presented preliminary morphological and song evidence suggesting that the Warbling Vireo complex might comprise more than one valid species. However, to date, Barlow’s suggestion is supported by only limited DNA evidence, demonstration of molt and migration differences between the taxa, and anecdotal accounts of differences in song, morphology, plumage, and ecology. We analyzed variation in both mitochondrial and nuclear DNA in birds from Alberta and surrounding areas to determine the levels of genetic differentiation and hybridization occurring in the contact zone, and whether the two taxa warrant recognition as separate biological species. Our analyses reveal that Warbling Vireos in Alberta and the surrounding areas are separated into two well-defined, genetically differentiated, and monophyletic clades corresponding to previously recognized taxonomic groups. The two taxa come into contact in a narrow (~85 km) zone in Barrhead County, northwest of Edmonton, Alberta. They show evidence of limited hybridization. The distinct genetic differences are maintained in the contact zone, where individuals of the two taxa may occupy neighboring territories. Differences in spring arrival dates, molt schedules, and migration routes indicate that a migratory divide may play an important role in reproductive isolation. We suggest that the two taxa are distinct cryptic species: an eastern form, Vireo gilvus, and a western form, Vireo swainsoni.

scholarly journals Revised distribution and phytosociological data of Orobanche coerulescens Stephan in Willd. (Orobanchaceae): Poland in relation to Central Europe

2012 ◽  
Vol 26 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Renata Piwowarczyk
Keyword(s):  
Eastern Europe ◽  
Central Europe ◽  
Plant Communities ◽  
Field Research ◽  
Range Limits ◽  
Migration Routes ◽  
Original Field ◽  
Critical Revision ◽  
And Migration ◽  
North Western

Abstract Orobanche coerulescens has a Eurasian distribution. The species is classified as extinct at most of its localities at the western limit of its range. Its populations are very scarce and critically endangered in Central Europe. This work presents the current distribution of O.coerulescens in Poland, based on a critical revision of herbarium and literature data as well as results of original field research, and reviews its distribution in Central Europe (partly in Eastern Europe). Habitats, plant communities, and migration routes of O.coerulescens in Central Europe are discussed. The species was initially known in Poland from now historical localities in Pomerania and the valley of the lower Vistula. In 2000-2011 it was recorded at 9 localities in Podlasie, the Małopolska Upland (Wyżyna Małopolska), and the Łódź Hills (Wzniesienia Łódzkie). Its abundance at the localities ranged from a few to over 1000 shoots. These are the largest populations of O.coerulescens at its western and north-western range limits.

Population dynamics of priority geostrategic Territories of Russia in 2010-2018

2021 ◽  
Vol 12 (2) ◽  
pp. 123-142
Author(s):  
Valery V. Patsiorkovsky ◽  
Yury A. Simagin ◽  
Djamila J. Murtuzalieva
Keyword(s):  
Economic Development ◽  
Population Dynamics ◽  
Russian Federation ◽  
Far East ◽  
The Arctic ◽  
Natural Growth ◽  
North Caucasus ◽  
Socio Economic Development ◽  
The Russian Federation ◽  
And Migration

The article presents an analysis of the dynamics of the population of the priority geostrategic territories of the Russian Federation. They are highlighted in the "Strategy for the Spatial Development of the Russian Federation until 2025" as territories that are of particular importance for the development of the country as a whole and are distinguished at the same time by special life conditions and the functioning of the economy due to their geographical location. Population dynamics for such territories is both a factor determining socio-economic development and an indicator of the effectiveness of this development. The components of the population dynamics - natural growth and migration flows - are of particular importance. The article describes all four groups of priority geostrategic territories of Russia - isolated from the main territory of the country (exclaves), located in the North Caucasus and the Far East, in the Arctic zone of the Russian Federation. For each group, trends in population dynamics have been identified since the 2010 census, taking into account the components of natural growth and migration. The multidirectional aspect of the main demographic processes in the priority geostrategic territories of the country is revealed - natural growth is combined with the migration outflow of the population, and the migration inflow - with natural decline. At the same time, in the exclave and North Caucasian territories, the population is growing, and in the Far Eastern and Arctic territories it is decreasing. The features of both groups of priority geostrategic territories in comparison with Russia as a whole and of individual constituent entities of the Russian Federation and municipalities within groups of territories are shown. The latter became possible due to the use of the database "Municipal Russia", that summarises demographic statistics for all urban districts and municipal areas of the country, including those located in priority geostrategic territories. As a result of the analysis of the population dynamics, directions have been identified that can lead to an improvement in the demographic situation in the priority geostrategic territories of the country, and, accordingly, will contribute to the socio-economic development of not only these territories, but the entire Russian Federation

scholarly journals An Analysis of the Questionnaire Investigation on Tourists’ Behavior

2017 ◽  
Vol 6 (4) ◽  
pp. 16
Author(s):  
Akane Okubo ◽  
Kazuhiro Takeyasu
Keyword(s):  
Local Government ◽  
Hypothesis Testing ◽  
Regional Cooperation ◽  
Economic Aspects ◽  
Local Society ◽  
Tourist Behavior ◽  
Regional Collaboration ◽  
The Common ◽  
Common Problems ◽  
And Migration

Tourists from abroad are increasing rapidly in Japan. Particular aims of local government are to overcome the common problems of an aging population and declining birthrate through tourism-generated income and to stimulate the local society through regional exchange and migration. In order to analyze economic aspects of tourism, accurate and up-to-date statistics and information regarding tourism are needed. Specifically, this study presents opportunities for inter-regional cooperation in marketing, in light of studies of tourist behavior at events featuring seasonal flowers and held in Kawazu town, which is located on the Izu Peninsula in Shizuoka Prefecture. In this paper, a questionnaire investigation is executed in order to clarify tourists’ behavior, and to seek the possibility of developing regional collaboration among local government, tourism related industry and visitors. Hypothesis testing was executed based on that. Some interesting and instructive results were obtained.

Automated monitoring of a large-scale cod (Gadus morhua) migration in the open sea

2002 ◽  
Vol 59 (12) ◽  
pp. 1845-1850 ◽  
Author(s):  
Luc A Comeau ◽  
Steven E Campana ◽  
Martin Castonguay
Keyword(s):  
Large Scale ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Seasonal Migration ◽  
Migration Routes ◽  
Eastern Canada ◽  
Migration Patterns ◽  
Migration Timing ◽  
Open Sea ◽  
And Migration

The migration patterns of marine fishes are poorly known, in part owing to the technical limitations associated with tracking the movements of animals in deep water. Here we document a large-scale, directed, migration of Atlantic cod (Gadus morhua) off eastern Canada. Our approach was based on the acoustic tagging of 126 fish and the deployment of 69 subsurface receivers, stretching over a 160-km distance along the edge of the Laurentian Channel. After 1 year of automated recording, we found that 65% of the fish migrated out of coastal waters in two distinct runs during the summer–autumn period. The offshore-migrating fish overwintered in deep Laurentian Channel waters, returning inshore in April. Individual migration routes and migration timing were variable, indicating that the cod did not aggregate in large schools during the seasonal migration events.

scholarly journals Rationale for the creation of the National natural park «Central Podillya»

2021 ◽  
Author(s):  
О. Mudrak ◽  
G. Mudrak ◽  
V. Serebryakov ◽  
A. Shcherbliuk ◽  
V. Klochaniuk
Keyword(s):  
Protected Areas ◽  
Local Population ◽  
Field Research ◽  
Pilot Project ◽  
Landscape Diversity ◽  
Forest Steppe ◽  
Migration Routes ◽  
Balanced Development ◽  
The Creation ◽  
And Migration

Based on comprehensive environmental monitoring, geobotanical, zoogeographical, landscape-ecological, hydro-ecological, forest-typological, agroecological principles and approaches and own field research it is proposed to create a national nature park (NNP) «Central Podillya» within Vinnytsia region. A promising NNP is planned to be created on the territory of Vinnytsia and Khmilnytsky administrative districts of Vinnytsia region as a habitat and migration routes of bison (Bison bonasus) and preservation of unique biotic and landscape diversity. The projected area of NPP «Central Podillya» is 53 820 hectares. The need to create a park due to the presence of natural (forest, wetland, peat-swamp, floodplain, meadow, forest-steppe, meadow-steppe, steppe, weed-field) complexes with associations of plant groups, where more than 40 species of plants and lives more than 50 species of animals listed in the RBU, as well as the presence of a significant number of objects that have historical, cultural, recreational, health (medical) value. The general ecological and geographical characteristics of the park from the standpoint of physical-geographical and geobotanical zoning are given. There are 34 objects of the nature reserve fund (NRF), which will be a part of the perspective park. Functional zoning of the territory of the projected NNP «Central Podillya» was carried out taking into account representative and rare ecosystems, where its 4 zones (protected, regulated recreation, stationary recreation, economic) were allocated. The structural elements of the ecological network of the perspective park are singled out. The necessity of protection, preservation and reproduction of biotic and landscape diversity and historical and cultural heritage of the studied territory through the greening of economic activity, education and culture of the local population is substantiated. It was found that the creation of NPP «Central Podillya» through the Presidential Decree and the optimization of protected areas, which account for 2.27% of the total area of Vinnytsia region, the implementation of regional ecological and Emerald networks is an extremely important, important and absolutely necessary for effective adjustment of the strategy of balanced development of territorial communities. Creation of NPP «Central Podillya» will increase the percentage of protected areas to 4.5% of the total area of Vinnytsia region. According to this indicator Vinnytsia region is in one of the last places in Ukraine. According to the Institute of World Resources (Washington), for the effective functioning of the territory, the area of its reserves should be at least 10–12%. Preparation of scientific substantiation and project of creation of NPP «Central Podillya» within Vinnytsia region is a pilot project that requires official detailing, delimitation, land management, coordination with land users on which the park will be located, creation of park directorate, introduction of technologies aimed at preservation and restoration of biogeocenotic cover, reproduction of broken types of connections, preservation of settlements, optimization of land use, balanced development of territorial communities that will be a part of the NNP.

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