scholarly journals The migration propensity index: An application to Guatemala

Author(s):  
Francisco Ceballos ◽  
Manuel A. Hernandez
Keyword(s):  
2021 ◽  
Vol 132 (8) ◽  
pp. e82-e83
Author(s):  
Sivapriya Senthilkumar ◽  
Chaitra Venugopal ◽  
K. Shobha ◽  
Bindu M. Kutty ◽  
Anandh Dhanushkodi

Author(s):  
Valentina Bosetti ◽  
Cristina Cattaneo ◽  
Giovanni Peri

Abstract There is extensive evidence that higher temperatures increase the probability of local conflict. There is also evidence that emigration represents an important margin of adaptation to a warming climate. In this article, we analyse whether migration influences the link between warming and conflicts by either attenuating this connection in countries of origin and/or by exacerbating it in countries of destination. We find that in countries where the propensity to emigrate—as measured by past diaspora—is higher, increases in temperature have smaller effects on the probability of armed conflict, compared to countries with lower migration propensity. This is consistent with emigration functioning as ‘escape valve’ for local tensions. We find no evidence that climate-induced migration increased the probability of conflict in receiving countries.


2020 ◽  
Vol 16 (4) ◽  
pp. 20190922 ◽  
Author(s):  
Andrew K. Davis ◽  
Farran M. Smith ◽  
Ashley M. Ballew

For many animals and insects that are experiencing dramatic population declines, the only recourse for conservationists is captive rearing. To ensure success, reared individuals should be biologically indistinct from those in the wild. We tested if this is true with monarch butterflies, Danaus plexippus , which are increasingly being reared for release by citizens and commercial breeders. Since late-summer monarchs should be as migration capable as possible for surviving the arduous long-distance migration, we evaluated four migration-relevant traits across two groups of captive-reared monarchs ( n = 41 and 42) and one group of wild-caught migrants ( n = 41). Monarchs (descendants of wild individuals) were reared from eggs to adulthood either in a warm indoor room next to a window, or in an incubator that mimicked late-summer conditions. Using an apparatus consisting of a perch mounted to an electronic force gauge, we assessed ‘grip strength' of all groups, then used image analysis to measure forewing size, pigmentation and elongation. In three of the four traits, reared monarchs underperformed compared to wild ones, even those reared under conditions that should have produced migration-ready individuals. The average strength of reared monarchs combined was 56% less than the wild group, even when accounting for size. Their orange wing colour was paler (an indicator of poor condition and flight ability) and their forewings were less elongated (elongation is associated with migration propensity) than wild monarchs. The reason(s) behind these effects is unknown but could stem from the frequent disturbance and/or handling of reared monarchs, or the fact that rearing removes the element of natural selection from all stages. Regardless, these results explain prior tagging studies that showed reared monarchs have lower migratory success compared to wild.


2006 ◽  
Vol 129 (4) ◽  
pp. 630-636 ◽  
Author(s):  
Alain Gagnon ◽  
Bruno Toupance ◽  
Marc Tremblay ◽  
Jan Beise ◽  
Evelyne Heyer

1985 ◽  
Vol 7 (1) ◽  
pp. 94-120 ◽  
Author(s):  
Brian L. Pitcher ◽  
William F. Stinner ◽  
Michael B. Toney

2004 ◽  
Vol 7 (10) ◽  
pp. 958-966 ◽  
Author(s):  
Ilkka Hanski ◽  
Claudia Erälahti ◽  
Maaria Kankare ◽  
Otso Ovaskainen ◽  
Heli Sirén

2020 ◽  
Vol 8 (2) ◽  
pp. 985-992
Author(s):  
Hairul Suhaimi Nahar ◽  
Erlane K Ghani

The purpose of the study: This research explores issues related to human mobility trend reflecting an increasing outflow of intellectual talents by surveying the migration propensity of future professional labours in Malaysia using small samples from selected universities having different establishment orientation and student compositions. It also surveys factors of their migration intention decisions. Methodology: A quantitative approach utilizing a questionnaire survey distributed to final year students was adopted. A total of 193 usable responses are used in the analysis covering descriptive and mean differences across five identified dimensions of gender, race, academic performance, university type, and education financing. Main Findings: The results indicate that 51% of the respondents have the intention of leaving the country, the majority of whom are private university students, females, Malays, studies funded by education loans, and those from the average group of academic achievement. The low economic reward was ranked first as the main factor in influencing their migration decision. Surprisingly, the worldwide application of accounting-based knowledge plays little role in students’ decision of migrating abroad, signalling students' inability to appreciate the economic consequence of mastering such knowledge and skills. Implications: The research contributes to the public policy debate with respect to education and human mobility by providing a strong basis for a reality check on the sustainability of Malaysia’s future landscape of its professional labour market. It also feeds critical policy inputs for all stakeholders involved, particularly the employers, in providing future Malaysian professionals with a conducive, meaningful, and rewarding career to attract and retain them.


2016 ◽  
Vol 24 (3) ◽  
pp. 381-396 ◽  
Author(s):  
Ibrahim Sirkeci ◽  
Jeffrey H. Cohen

We approach Turkish mobility using a culture of migration perspective with reference to conflict. Conflicts are defined broadly into an array of situations including minor disputes, tensions or latent conflicts on the one hand and major violent events on the other. These situations, defined along a security continuum shape individual perceptions. Increasing perceptions of human insecurity are positively correlated to a rise in migration propensity. Applied to Turkey’s international migration history we note that major conflicts have determined inflows and outflows of populations and created a Turkish culture of migration, which reinforces continuous population flows between countries of destination and origin. Migration flows between Germany and Turkey are exemplary in this regard.


2018 ◽  
Vol 285 (1888) ◽  
pp. 20181333 ◽  
Author(s):  
Jan-Niklas Runge ◽  
Anna K. Lindholm

Life is built on cooperation between genes, which makes it vulnerable to parasitism. Selfish genetic elements that exploit this cooperation can achieve large fitness gains by increasing their transmission relative to the rest of the genome. This leads to counter-adaptations that generate unique selection pressures on the selfish genetic element. This arms race is similar to host–parasite coevolution, as some multi-host parasites alter the host’s behaviour to increase the chance of transmission to the next host. Here, we ask if, similarly to these parasites, a selfish genetic element in house mice, the t haplotype, also manipulates host behaviour, specifically the host’s migration propensity. Variants of the t that manipulate migration propensity could increase in fitness in a meta-population. We show that juvenile mice carrying the t haplotype were more likely to emigrate from and were more often found as migrants within a long-term free-living house mouse population. This result may have applied relevance as the t has been proposed as a basis for artificial gene drive systems for use in population control.


1985 ◽  
Vol 7 (4) ◽  
pp. 535-562 ◽  
Author(s):  
William F. Stinner ◽  
Brian L. Pitcher ◽  
Michael B. Toney

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