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Search Results: 1 - 10 of 3750 matches for " migration routes "
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The use of GPS radio-collars to track elephants (Loxodonta africana) in the Tarangire National Park (Tanzania)
Valeria Galanti,Guido Tosi,Rossella Rossi,Charles Foley
Hystrix : the Italian Journal of Mammalogy , 2000, DOI: 10.4404/hystrix-11.2-4145
Abstract: The GPS (Global Positioning System) telemetry was used in Tarangire National Park (Tanzania) to study migration routes and the use of space by elephants (Loxodonta africana). Five female elephants were captured in November 1997 in five different areas of Tarangire National Park and fitted with GPS collars. The collar consists of a 6 channel Global Positioning System (GPS) receiver, a radio-modem for data communication, a non volatile memory, and an independent VHF transmitter. The operator can communicate with the collar through a command unit connected to a PC. The GPS collar receives signals from different satellites which permits automatic calculation of its position, with an accuracy of 25 m. The data collected in the period November 1997 - April 1998 show that three female elephants mainly used the northern sector of the park, moving sometimes outside the protected area about 10 to 20 km NE of the park boundary. Also the two female elephants captured in the southern sector of the park moved outside, travelling about 80 km SE of the park boundary. Home range size varied between 159 and 660 km2 for the northern elephants (n=3), and between 2104 and 3314 km2 for the southern elephants (n=2). The elephants whose ranges extended outside the park exhibited their highest movement rate from 4 p.m. to 12 p.m., while those animals within the park had the highest movement rates during daylight hours (from 8 a.m. to 4 p.m.). We discuss the advantages and shortcomings of GPS-telemetry as a means of gathering useful information on space use and movements of elephants for the development of long-term conservation strategies for large herbivores in the whole Tarangire area.
EVOLUTION OF CONCEPTION OF INTEGRAL BIRDS AREAL: ANALYSIS OF MIGRATORY FLYWAYS
Matsyura A. V.,Gorlov P. I.,Shepelova I. A.
Bìologì?nij Vìsnik Melìtopol?s?kogo Der?avnogo Pedagogì?nogo Universitetu ìmenì Bogdana Hmel?nic?kogo , 2012,
Abstract: Data on distribution and abundance of Ukraine migratory birds have nonsystematic character. Up to now there is no integrated evaluation of migratory bird populations’ status. The available information is of regional importance or it covers limited time period. Therefore, it is obvious to unite all the relevant information in order to establish monitoring program and work out the methodic on migratory birds abundance estimation concerning the Black-Mediterranean Sea Flyway.
Analysis of the temporary evolution of the Romanian migration flows abroad, on migration routes
Maria-Daniela Bondoc,Ramona-Florina Popescu,Emilia Ungureanu
Revista de Cercetare ?i Interven?ie Social? , 2010,
Abstract: This article analyses the international migration of the Romanians based on their direction, within the extent of 1990-2008. The tendencies are being examined depending on the region of origin and of destination of the migrants and also depending on the residential environment of migrants. The study details the labour circular migration, divided on the fourth main courses. The authors try to conduct a literature review on the subject, emphasising the conclusions of different studies conducted for the considered period.
Florística e fitossociologia do componente arbóreo de uma floresta ribeirinha, arroio Passo das Tropas, Santa Maria, RS, Brasil
Budke, Jean Carlos;Giehl, Eduardo Luis Hettwer;Athayde, Eduardo Anversa;Eisinger, S?nia Maria;Záchia, Renato Aquino;
Acta Botanica Brasilica , 2004, DOI: 10.1590/S0102-33062004000300016
Abstract: riverine forests have great environmental diversity, where many factors, physical and biotical, play a role on the vegetation mosaic. although riverine forests are hot spots for conservation, because of their fragility and ecological importance, few studies has been made in these areas, especially in rio grande do sul state. the aim of this work is to determine the floristic composition and the vegetation structure of arboreal species in a riverine forest in santa maria municipality. all individuals with pbh > 15 cm were sampled within 100 plots, each one 100m2. a total of 2,195 living and 137 standing dead individuals were sampled, belonging to 57 species and 26 botanicals families. the species with the largest importance values are gymnanthes concolor spreng, sebastiania commersoniana (baill.) smith & downs, eugenia uniflora l., plinia rivularis (camb.) rotman and sebastiania brasiliensis spreng. the diversity index (h') was 2.73 nats/individuals and the equability (j') 0.69 nats/individuals, which are considered intermediates values when compared with others works. more than half of the species (57%) belong to the eastern migratory group, characteristic of the paraná-uruguai basin, while 41% of the species have a large distribution in the state and only one specie belong to the atlantic corridor.
Roots and Routes
Ann-Dorte Christensen, Sune Qvotrup Jensen
Nordic Journal of Migration Research , 2011, DOI: 10.2478/v10202-011-0013-1
Abstract: This article is about transnational migrants, how they construct belonging to ‘new’ places where they have arrived, and how the feelings of belonging to their places of origin change when they go back. The theoretical part of the article outlines the relationship between migration and belonging arguing that there is a dynamic interplay between roots and routes in people's lives. The empirical point of departure is narratives about roots and routes by ethnic minorities settled in Aalborg East, an underprivileged neighbourhood in northern Denmark. One of the main findings is a gap between the national exclusion of transnational migrants marked as ‘strangers’ and border figures of the nation and a relatively high degree of local belonging to the neighbourhood. This is followed by an in-depth empirical analysis inspired by Alfred Schutz's distinction between the stranger and the homecomer. A somewhat paradoxical finding is that it appears to be more difficult for transnational migrants to maintain their roots in the country of origin when they go back than it was to establish new roots in the host country.
From the Black Sea Coast to Poland - An Incredible Journey of Monacha cartusiana (O. F. Müller, 1774)
Katarzyna Kurek , Kamil Najberek
Folia Malacologica , 2009, DOI: 10.2478/v10125-009-0005-0
Abstract: Though Monacha cartusiana (O. F. Müll.) is known to expand its distribution range through accidental introductions, the migration routes are usually unknown. The story of an individual which covered a distance of about 1,500 km from the Crimea to Poland, attached to a car, is one of the few examples of a fully documented migration pathway.
Theoretical and Methodological Contributions of a Multi-Situated Approach and the Analysis of Migration Routes: The Example of Migration between Morocco and Canada
Garneau, Stéphanie;
Frontera norte , 2010,
Abstract: based on a series of research results on moroccan migration to canada, this paper seeks to prove how focusing on the migration routes of a specific national group of migrants and using a multi-situated methodological approach will not lead to the "ethnisizing", culturalizing or nationalizing of the experienced realities, but rather to the placing of actions within their political, cultural, social and economic structuring contexts. by resorting to an inductive approach, this perspective allows us to identify frontiers (in a symbolic sense) other than cultural or national belonging, reminding us of the internal heterogeneity of the studied national group, allowing us to apprehend other decisive factors in the migration route, and favoring our understanding of the plurality of the space practices and integration strategies developed by social actors when facing the concrete opportunities and limitations found during the whole migration process.
Satellite Tracking on the Migratory Routes of Wintering Black-necked Cranes at Dashanbao in Yunnan
云南大山包越冬黑颈鹤迁徙路线的卫星跟踪

GAO Li-bo,QIAN Fa-wen,YANG Xiao-jun,WU He-qi,LI Feng-shan,
高立波

动物学研究 , 2007,
Abstract: Platform Transmitter Terminals (PTTs) were fitted onto four Black-necked Cranes (Grus nigricollis) at Dashanbao National Nature Reserve in northeast Yunnan Province on 26 February and 1 March, 2005, to study their migratory routes and stopover sites. Of the four birds, two successfully arrived at their breeding ground in late March and early April. Of the two cranes, one completed its autumn migration in November, 2005 and spring migration in March, 2006. During spring migration, the two cranes crossed over the Jinsha River and then the Dadu River, in the upper reaches of the Yangtze River. They finally arrived in the basins of the Baihe and Heihe Rivers, in the Ruoergai Marsh in the upper streams of the Yellow River. From wintering to breeding areas, these two birds traveled 674 km and 713 km respectively, stopped at three to four sites in Sichuan Province and took three to four days to travel this distance in spring 2005. The bird that completed its fall migration in 2005 took eight days. Based on location data from the PTTs, 13 stopover sites of the four Black-necked Cranes were confirmed in Sichuan Province, with an elevation over 1 900 m above sea level. Of the 13 sites, 11 were located on riversides and the other two were by alpine lakes.
A Study of Shark Stealth Behavior in the Proximity of Divers  [PDF]
Erich Ritter, Raid Amin
Open Journal of Animal Sciences (OJAS) , 2015, DOI: 10.4236/ojas.2015.52025
Abstract: This study examines the approach patterns of sharks in the vicinity of human divers, focusing on the diver’s body orientation and a shark’s distance from the sea bed when approaching the diver. A standardized video method was used to record the scenario of diver(s) kneeling in the sand while being approached by sharks. This showed that sharks had a preference to move in from outside a diver’s field of vision while larger sharks stayed closer to the sea floor. This may simultaneously enhance camouflage while reducing potential escape routes for the approaching animal. This stealth behavior raises the question of how sharks may interpret humans when moving towards them.
NOTES FROM THE EDITOR: Revisiting Migration
Teresa S. Encarnacion Tadem
Kasarinlan : Philippine Journal of Third World Studies , 2007,
Abstract:
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