2 edition of Selected quantitative data on night migration in autumn found in the catalog.
Selected quantitative data on night migration in autumn
Robert J. Newman
|Statement||Robert J. Newman and George H. Lowery, Jr.|
|Series||Special publication of the Museum of Zoology -- no. 3|
|Contributions||Lowery, George H., jr., Louisiana State University (Baton Rouge, La.)|
|The Physical Object|
|Pagination||39,  p.|
|Number of Pages||39|
Search the world's most comprehensive index of full-text books. My library. migration and mobility policies needs to be underpinned by sound evidence and analysis, reliable and comparable data, of the kind that socio-economic research is in a position to contribute to. At European level, research on migration was widely supported by the Seventh Framework Programme for Research (FP7), in particular under the Socio-File Size: KB.
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In autumn, the duration of nocturnal flights of thrushes under head winds is much shorter than under the tail winds. In our opinion, it allows thrushes to use two alternative strategies of migration in autumn: • long nocturnal flights under tail winds with subsequent long stopovers; •Cited by: 3.
autumn migration averaged slightly higher. My data on the ab- solute altitude at which passerine migration takes place differ markedly from these estimates. My hourly means for clear nights are all below 1, ft. For every hour of the night, more than 60% of the passerine migrants were below 2, ft.
I believe in general. Migration timing and its determinants for nocturnal migratory birds during autumn migration Frank A. La Sorte1*, Wesley M. Hochachka1, Andrew Farnsworth1, Daniel Sheldon2,3, Daniel Fink1, Jeffrey Geevarghese2, Kevin Winner2, Benjamin M. Van Doren1 and Steve Kelling1 1Cornell Laboratory of Ornithology, Cornell University, Ithaca, New YorkUSA; 2School of Computer Science,Cited by: The two migrations differ in several ways.
First, spring and autumn migrations placed before and after the breeding season, respectively, differ in context. Spring migration is relevant for the timely arrival of migrants at the breeding grounds, while the autumn migration is essentially for the wintering habitat with an adequate food by: 9.
Perdeck AC () An experiment on the ending of autumn migration in starlings. Ardea – Google Scholar Podolsky RH, Shaw RG, Shaw FH () Population structure of morphological traits in Clarkia by: Migration is fundamental in the life of many birds and entails significant energetic and time investments.
Given the importance of arrival time in the breeding area and the relatively short period available to reproduce (particularly at high latitudes), it is expected that birds reduce spring migration duration to a greater extent than autumn migration, assuming that pressure to arrive into Cited by: 3.
The main purpose of this article is a brief presentation of the most crucial stages of a research process concerning migration of foreign workers in Greece. The research (within my doctoral studies at Sussex University, Brighton, UK) was undertaken for a period of almost nine months () in Athens, Greece.
In this article I present some important dimensions of the multiple methods Cited by: The autumn migration of Helicoverpa armigera (Hübner) was observed with radar and two types of light-trap at Langfang, Hebei province, China in and The sudden increase in the proportion of H.
armigera moths in the searchlight trap indicated migration into the area and catches increased fold during the second half of the night due to the landing of migrants before by: Moving away from the quantitative and empiricist-positivist approaches that have often characterised migration research, Qualitative Methods in Migration Studies explores in a concise but comprehensive way the key issues involved in researching migratory phenomena in a qualitative.
Quantitative methods in migration research identifying available data sources on migration flows and stocks at a regional and national level (macro-level data) 2) designing a survey on migration topics: sampling issues, developing the questionnaire, Introduction to quantitative migration research and selected theoretical approaches in File Size: 40KB.
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the : Syed Muhammad Sajjad Kabir. International migration data collection A paper prepared for the Policy Analysis and Research Programme of the Global Commission on International Migration by John Parker [email protected] September The analysis provided in this paper is that of the author, and does not.
The date of migration initiation (F 1, 30 =p =R 2 = ), migration midpoint (F 1, 30 =p =R 2 = ), migration termination (F 1, 30 =p =R 2 = ), and the duration of migration (F 1, 30 =p =R 2 = ) did not vary due to individual model classification (single- or double-sigmoid).
Thus, all subsequent analyses pooled information from both Cited by: Bird migration occurred during many nights, but a smaller number of nights with large movements of birds defined regional nocturnal migration. Densities varied by date, time, and location but peaked in the second and third deciles of night during the autumn Cited by: Newspaper data are popular in Comparative Migration Studies as they allow diachronic and cross-national comparison and are relatively easy and inexpensive to acquire.
Critics, however, warn that newspaper data are hampered by selection, description and researcher bias. This article argues that research drawing on newspaper data can be improved by employing mixed methods to confirm and Cited by: 3. Latin America & the Caribbean Migration Portal.
This is the first comprehensive website that tracks immigration policy developments in Latin America and the Caribbean, presenting authoritative research, data, and analysis from MPI, governments, international organizations, researchers, and civil society.
We analyzed our expression profiles to find out whether genes in selected categories had coordinated expression patterns, and to obtain quantitative data on the total pattern of gene expression for the different categories.
We discuss the results for genes found in some of the categories, but the full dataset is presented in Additional data by: numbers passing. This method permitted direct quantitative observa- tions on night migration for the first time, but it is usable only on clear, moonlit nights, so has limited application to the problem reviewed here.
Still more recently, Sutter (a,b) established the value of radar. Recent years have witnessed growing interest in a series of issues related to migration, including identity formation and change, the role of social capital and social networks, ethnic discrimination, racism and xenophobia, socio-political participation and mobilisation and the complex nature of the causal mechanisms linked to migration - issues that are better highlighted and investigated.
Library of Congress Cataloging-in-Publication Data. Climate change and migration: evidence from the Middle East and North Africa / edited by Quentin Wodon, Andrea Liverani, George Joseph, and Nathalie Bougnoux. pages cm “World Bank Study.” ISBN —ISBN 1.
Migration, Internal—Environmental aspects. Moon watching is a method of quantifying nocturnal bird migration by focusing a telescope on the moon and recording observations of flying birds silhouetted against the lunar surface. Although simple and well-established, researchers use moon watching infrequently due in part to the hours of late night observation it requires.The average density of nocturnal passerine migration (migration traffic rate) comprised 14 birdsnight -1 km -1 in September and birdsnight -1 km -1 in October.Migration Books Showing of 2, The Warmth of Other Suns: The Epic Story of America's Great Migration (Hardcover) by.
Isabel Wilkerson (Goodreads Author) (shelved 42 times as migration) avg rating — 50, ratings — published Want to Read saving Want to Read.