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From Migration Corridors to Clusters: The Value of Google+ Data for Migration Studies [article]

Johnnatan Messias and Fabricio Benevenuto and Ingmar Weber and Emilio Zagheni
2016 arXiv   pre-print
In our work, we use data about "places lived" from millions of Google+ users in order to study migration "clusters", i.e. groups of countries in which individuals have lived.  ...  We hope that this first study about migration clusters will stimulate the use of Web data for the development of new theories of international migration that could not be tested appropriately before.  ...  We also would like to thank Gabriel Magno for sharing his data collection.  ... 
arXiv:1607.00421v1 fatcat:nqm5enmspzhpdfxvaky2d5mybe

The contribution of the lexical component in hybrid clustering, the case of four decades of "Scientometrics"

Bart Thijs, Wolfgang Glänzel
2018 Scientometrics  
This study investigates the contribution of the lexical component in hybrid cluster on a set of articles published in the journal Scientometrics since its foundation during four decades.  ...  Earlier research showed the added value of hybrid document networks over link-based ones through the reduction of the extreme sparseness.  ...  H 100 most papers are gender studies but use a publication set retrieved from Google Scholar.  ... 
doi:10.1007/s11192-018-2659-0 fatcat:2ccoftdk7ne5zc6y7j6rcop4qq

Randomized Experimental Design via Geographic Clustering [article]

David Rolnick, Kevin Aydin, Jean Pouget-Abadie, Shahab Kamali, Vahab Mirrokni, Amir Najmi
2019 arXiv   pre-print
We use a random sample of anonymized traffic from Google Search to form a graph representing user movements, then construct a geographically coherent clustering of the graph.  ...  Our main technical contribution is a statistical framework to measure the effectiveness of clusterings.  ...  Acknowledgments The authors would like to thank Kay Brodersen and Hal Varian for helpful advice.  ... 
arXiv:1611.03780v2 fatcat:cb4mwl7bfngt5gtin77fhr5lsq

Clusters of Entrepreneurship and Innovation

Aaron Chatterji, Edward Glaeser, William Kerr
2014 Innovation Policy and the Economy  
We discuss rationales for the agglomeration of these activities and the economic consequences of clusters.  ...  While arguments exist for and against policy support of entrepreneurial clusters, our understanding of what works and how it works is quite limited.  ...  The need for specialized infrastructure does increase the value of clustering.  ... 
doi:10.1086/674023 fatcat:e6b4logt45dinhdioxi3liwyvu

Prioritizing Tiger Conservation through Landscape Genetics and Habitat Linkages

Bibek Yumnam, Yadvendradev V. Jhala, Qamar Qureshi, Jesus E. Maldonado, Rajesh Gopal, Swati Saini, Y. Srinivas, Robert C. Fleischer, Alfred L. Roca
2014 PLoS ONE  
The results of our study highlight that many corridors may still be functional as there is evidence of contemporary migration.  ...  However, habitat corridors that link regional tiger populations are often lost to development projects due to lack of objective evidence on their importance.  ...  Acknowledgments We thank the Ministry of Environment and Forests, and the Chief Wildlife Wardens of Madhya Pradesh, Maharashtra, and Chhattisgarh states, India, for permissions and logistic support.  ... 
doi:10.1371/journal.pone.0111207 pmid:25393234 pmcid:PMC4230928 fatcat:c7omrbuzxvhlbkmk23xleu5rle

A multi-method approach to delineate and validate migratory corridors

Monica L. Bond, Curtis M. Bradley, Christian Kiffner, Thomas A. Morrison, Derek E. Lee
2017 Landscape Ecology  
We merged the predictive corridors from these three data-method combinations to reveal habitat with 20 highest probability of use.  ...  We used this approach to delineate and validate migration corridors for wildebeest (Connochaetes taurinus) in the Tarangire Ecosystem of northern Tanzania.  ...  Acknowledgements This research was conducted with permission from Tanzania Commission for Science and  ... 
doi:10.1007/s10980-017-0537-4 fatcat:a5gg64hvyzfuhf7xcb424rjgki

The renaissance of the city as a cluster of innovation

Jerome S. Engel, Jasmina Berbegal-Mirabent, Josep M. Piqué, Sebastian Aparicio
2018 Cogent Business & Management  
Acknowledgments Jasmina Berbegal-Mirabent acknowledges financial support by the Spanish Ministry of Education, Culture and Sport, under the "José Castillejo" Mobility Grant Program (CAS15/00297) and the  ...  Data were collected from February to June 2016.  ...  Knowledge and technology naturally migrate with people from one venture to another. A similar behavior is observed in the mobility of money.  ... 
doi:10.1080/23311975.2018.1532777 fatcat:n2syuhygd5g7zcvothavy6seci

Exploration of Urban Interaction Features Based on the Cyber Information Flow of Migrant Concern: A Case Study of China's Main Urban Agglomerations

Chun Li, Xingwu Duan
2020 International Journal of Environmental Research and Public Health  
Considering the dramatic population migration and the explosive growth of cyberspace in China's main urban agglomerations, we constructed the information flow of migrant attention (IFMA) index to quantify  ...  for the adjustment of urban landscape planning.  ...  All authors have read and agreed to the published version of the manuscript. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/ijerph17124235 pmid:32545840 fatcat:tpwecpv6rbfxjoz7w5jnkde4ua

Phylogeography of the termite Macrotermes gilvus and insight into ancient dispersal corridors in Pleistocene Southeast Asia

G. Veera Singham, Ahmad Sofiman Othman, Chow-Yang Lee, Tzen-Yuh Chiang
2017 PLoS ONE  
Dispersal of soil-dwelling organisms via the repeatedly exposed Sunda shelf through much of the Pleistocene in Southeast Asia has not been studied extensively, especially for invertebrates.  ...  We sampled 213 termite colonies from 66 localities throughout the region. Independently inherited microsatellites and mtDNA markers were used to infer the phylogeographic framework of M. gilvus.  ...  To validate the clustering accuracy, the genotypic data from each termite were assigned back into the respective clusters as determined by STRUCTURE [51] .  ... 
doi:10.1371/journal.pone.0186690 pmid:29186140 pmcid:PMC5706666 fatcat:ki24msro25dvxd5we45kq4mjr4

Dispersal and genetic structure in a tropical small mammal, the Bornean tree shrew (Tupaia longipes), in a fragmented landscape along the Kinabatangan River, Sabah, Malaysia

Jennifer Brunke, Isa-Rita M Russo, Pablo Orozco-terWengel, Elke Zimmermann, Michael W Bruford, Benoit Goossens, Ute Radespiel
2020 BMC Genetics  
This study revealed the importance of landscape connectivity to maintain migration and gene flow between fragmented populations, and to ensure the long-term persistence of species in anthropogenically  ...  In addition to the Kinabatangan River, a known barrier for dispersal in tree shrews, the heterogeneous landscape along the riverbanks affected the genetic structure in this species.  ...  We are grateful to Audrey Adella Umbol for her help with local authorities and Jumrafiah Abd. Shukor for accepting the role of the Malaysian counterpart.  ... 
doi:10.1186/s12863-020-00849-z pmid:32303177 pmcid:PMC7164274 fatcat:wotuwbjpkzb67bi3vmn2hkmvnq

Linking Ecosystem Service and MSPA to Construct Landscape Ecological Network of the Huaiyang Section of the Grand Canal

Feng Tang, Xu Zhou, Li Wang, Yangjian Zhang, Meichen Fu, Pengtao Zhang
2021 Land  
, and the level of ecosystem services showed a trend of continuous degradation from 1990 to 2018.  ...  This study is of great significance for carrying out the ecological protection and restoration of the Huaiyang Canal and adjusting local land-use policies.  ...  In addition, there were several small-scale high-value ecological resistance clusters in the middle regions of the study area.  ... 
doi:10.3390/land10090919 fatcat:iju5c553ifefrlyorssokl6ugy

Wind selectivity and partial compensation for wind drift among nocturnally migrating passerines

James D. McLaren, Judy Shamoun-Baranes, Willem Bouten
2012 Behavioral Ecology  
migration corridor to the Iberian coast.  ...  We conclude that along migration corridors with generally nonsupportive winds, juvenile passerines should not strictly select supportive winds but partially compensate for drift to increase their chances  ...  This study represents the first direct comparison of radar data with IBMs.  ... 
doi:10.1093/beheco/ars078 pmid:22936843 pmcid:PMC3431116 fatcat:vwdnwm23uvd3bgcep64bwnzq3q

Genome-wide diversity and global migration patterns in dromedaries follow ancient caravan routes

Sara Lado, Jean Pierre Elbers, Angela Doskocil, Davide Scaglione, Emiliano Trucchi, Mohammad Hossein Banabazi, Faisal Almathen, Naruya Saitou, Elena Ciani, Pamela Anna Burger
2020 Communications Biology  
By understanding subtle population structure we recognize the value of small, locally adapted populations and appeal for securing genomic diversity for a sustainable utilization of this key desert species  ...  Global patterns of effective migration rates revealed pathways of dispersal after domestication, following historic caravan routes like the Silk and Incense Roads.  ...  Acknowledgements We are very grateful to all veterinarian colleagues and camel owners for their agreements to submit sample aliquots for scientific purposes.  ... 
doi:10.1038/s42003-020-1098-7 pmid:32678279 pmcid:PMC7366924 fatcat:ol535d42gvaz5clt3xuewrkve4

Movements of Wild Ruddy Shelducks in the Central Asian Flyway and Their Spatial Relationship to Outbreaks of Highly Pathogenic Avian Influenza H5N1

John Takekawa, Diann Prosser, Bridget Collins, David Douglas, William Perry, Baoping Yan, Luo Ze, Yuansheng Hou, Fumin Lei, Tianxian Li, Yongdong Li, Scott Newman
2013 Viruses  
Thus, studies of the movement ecology of wild birds in areas with persistent HPAI H5N1 outbreaks may contribute to understanding their role in transmission of this disease.  ...  However, timing of outbreaks suggested that outbreaks in the flyway began during the winter in poultry with spillover to wild birds during the spring migration.  ...  Conflicts of Interest The authors declare no conflict of interest.  ... 
doi:10.3390/v5092129 pmid:24022072 pmcid:PMC3798894 fatcat:jdkudnkdg5fstagtvbgpgp5xji

Phenotypic and morphometric differentiation of indigenous chickens from Kenya and other tropical countries augments perspectives for genetic resource improvement and conservation

Newton O Otecko, Irene Ogali, Said I Ng'ang'a, David H Mauki, Stephen Ogada, Grace K Moraa, Jacqueline Lichoti, Bernard Agwanda, Min-Shen Peng, Sheila C Ommeh, Ya-Ping Zhang
2019 Poultry Science  
Using a comprehensive dataset of Kenyan indigenous chickens and additional mined data of chickens from 8 African and 5 Asian countries, we performed univariate and multivariate assessments to uncover the  ...  genotypic assessments to identify resources for effective breed improvement and conservation strategies of indigenous chickens in the tropics.  ...  ACKNOWLEDGMENTS We sincerely thank the Director of the Veterinary Services Ministry of Agriculture Livestock Fisheries and Irrigation of Kenya for granting permission to conduct this work.  ... 
doi:10.3382/ps/pez097 pmid:30850827 pmcid:PMC6591685 fatcat:dswjrbrwa5cmnpjd2sfb2tqlpy
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