Modeling Caribou Movements: Seasonal Ranges and Migration Routes of the Central Arctic Herd

Migration is an important component of the life history of many animals, but persistence of large-scale terrestrial migrations is being challenged by environmental changes that fragment habitats and create obstacles to animal movements. In northern Alaska, the Central Arctic herd (CAH) of barren-ground caribou (Rangifer tarandus granti) is known to migrate over large distances, but the herd’s seasonal distributions and migratory movements are not well documented. From 2003–2007, we used GPS radio-collars to determine seasonal ranges and migration routes of 54 female caribou from the CAH. We calculated Brownian bridges to model fall and spring migrations for each year and used the mean of these over all 4 years to identify areas that were used repeatedly. Annual estimates of sizes of seasonal ranges determined by 90% fixed kernel utilization distributions were similar between summer and winter ($\bar{X}$ = 27,929 SE = 1,064 and $\bar{X}$ = 26,585 SE = 4912 km², respectively). Overlap between consecutive summer and winter ranges varied from 3.3–18.3%. Percent overlap between summer ranges used during consecutive years ($\bar{X}$ = 62.4% SE = 3.7%) was higher than for winter ranges ($\bar{X}$ = 42.8% SE = 5.9%). Caribou used multiple migration routes each year, but some areas were used by caribou during all years, suggesting that these areas should be managed to allow for continued utilization by caribou. Restoring migration routes after they have been disturbed or fragmented is challenging. However, prior knowledge of movements and threats may facilitate maintenance of migratory paths and seasonal ranges necessary for long-term persistence of migratory species.     

Migration,Foraging, and Residency Patterns for Northern Gulf Loggerheads: Implications of Local Threats and International Movements

Northern Gulf of Mexico (NGoM) loggerheads (Caretta caretta) make up one of the smallest subpopulations of this threatened species and have declining nest numbers. We used satellite telemetry and a switching state-space model to identify distinct foraging areas used by 59 NGoM loggerheads tagged during 2010–2013. We tagged turtles after nesting at three sites, 1 in Alabama (Gulf Shores; n = 37) and 2 in Florida (St. Joseph Peninsula; n = 20 and Eglin Air Force Base; n = 2). Peak migration time was 22 July to 9 August during which >40% of turtles were in migration mode; the mean post-nesting migration period was 23.0 d (±13.8 d SD). After displacement from nesting beaches, 44 turtles traveled to foraging sites where they remained resident throughout tracking durations. Selected foraging locations were variable distances from tagging sites, and in 5 geographic regions; no turtles selected foraging sites outside the Gulf of Mexico (GoM). Foraging sites delineated using 50% kernel density estimation were located a mean distance of 47.6 km from land and in water with mean depth of −32.5 m; other foraging sites, delineated using minimum convex polygons, were located a mean distance of 43.0 km from land and in water with a mean depth of −24.9 m. Foraging sites overlapped with known trawling activities, oil and gas extraction activities, and the footprint of surface oiling during the 2010 Deepwater Horizon oil spill (n = 10). Our results highlight the year-round use of habitats in the GoM by loggerheads that nest in the NGoM. Our findings indicate that protection of females in this subpopulation requires both international collaborations and management of threats that spatially overlap with distinct foraging habitats.     

Cell Movements and Mechanical Force Distribution During the Migration of Dictyostelium Slugs

Migration of Dictyostelium discoideum slugs results from coordinated movement of their constituent cells. It is generally assumed that each cell contributes to the total motive force of the slug. However, the basic mechanisms by which mechanical forces (traction and resistive forces) are transmitted to the substrate, their magnitude and their location, are largely unknown. In this work, we performed detailed observations of cell movements by fluorescence microscopy using two-dimensional (2D) slugs. We show that 2D slugs share most of the properties of 3D ones. In particular, waves of movement propagate in long 2D slugs, and slug speed correlates with slug length as found in 3D slugs. We also present the first measurements of the distribution of forces exerted by 2D and 3D slugs using the elastic substrate method. Traction forces are mainly exerted in the central region of the slug. The large perpendicular forces around slug boundary and the existence of parallel resistive forces in the tip and/or the tail suggest an important role of the sheath in the transmission of forces to the substrate.     

Human Migration Patterns in Yemen and Implications for Reconstructing Prehistoric Population Movements

Population migration has played an important role in human evolutionary history and in the patterning of human genetic variation. A deeper and empirically-based understanding of human migration dynamics is needed in order to interpret genetic and archaeological evidence and to accurately reconstruct the prehistoric processes that comprise human evolutionary history. Current empirical estimates of migration include either short time frames (i.e. within one generation) or partial knowledge about migration, such as proportion of migrants or distance of migration. An analysis of migration that includes both proportion of migrants and distance, and direction over multiple generations would better inform prehistoric reconstructions. To evaluate human migration, we use GPS coordinates from the place of residence of the Yemeni individuals sampled in our study, their birthplaces and their parents'' and grandparents'' birthplaces to calculate the proportion of migrants, as well as the distance and direction of migration events between each generation. We test for differences in these values between the generations and identify factors that influence the probability of migration. Our results show that the proportion and distance of migration between females and males is similar within generations. In contrast, the proportion and distance of migration is significantly lower in the grandparents'' generation, most likely reflecting the decreasing effect of technology. Based on our results, we calculate the proportion of migration events (0.102) and mean and median distances of migration (96 km and 26 km) for the grandparent''s generation to represent early times in human evolution. These estimates can serve to set parameter values of demographic models in model-based methods of prehistoric reconstruction, such as approximate Bayesian computation. Our study provides the first empirically-based estimates of human migration over multiple generations in a developing country and these estimates are intended to enable more precise reconstruction of the demographic processes that characterized human evolution.     

Horizontal Movements,Migration Patterns,and Population Structure of Whale Sharks in the Gulf of Mexico and Northwestern Caribbean Sea

Whale sharks, Rhincodon typus, aggregate by the hundreds in a summer feeding area off the northeastern Yucatan Peninsula, Mexico, where the Gulf of Mexico meets the Caribbean Sea. The aggregation remains in the nutrient-rich waters off Isla Holbox, Isla Contoy and Isla Mujeres, Quintana Roo for several months in the summer and then dissipates between August and October. Little has been known about where these sharks come from or migrate to after they disperse. From 2003–2012, we used conventional visual tags, photo-identification, and satellite tags to characterize the basic population structure and large-scale horizontal movements of whale sharks that come to this feeding area off Mexico. The aggregation comprised sharks ranging 2.5–10.0 m in total length and included juveniles, subadults, and adults of both sexes, with a male-biased sex ratio (72%). Individual sharks remained in the area for an estimated mean duration of 24–33 days with maximum residency up to about 6 months as determined by photo-identification. After leaving the feeding area the sharks showed horizontal movements in multiple directions throughout the Gulf of Mexico basin, the northwestern Caribbean Sea, and the Straits of Florida. Returns of individual sharks to the Quintana Roo feeding area in subsequent years were common, with some animals returning for six consecutive years. One female shark with an estimated total length of 7.5 m moved at least 7,213 km in 150 days, traveling through the northern Caribbean Sea and across the equator to the South Atlantic Ocean where her satellite tag popped up near the Mid-Atlantic Ridge. We hypothesize this journey to the open waters of the Mid-Atlantic was for reproductive purposes but alternative explanations are considered. The broad movements of whale sharks across multiple political boundaries corroborates genetics data supporting gene flow between geographically distinct areas and underscores the need for management and conservation strategies for this species on a global scale.     

Belonging: Australians, Place and Aboriginal Ownership

Belonging: Australians, Place and Aboriginal Ownership. Peter Read. Cambridge: Cambridge University Press, 2000. 248 pp.     

Transnationalism and the state: recurring themes and new directions

Transnationalism is central to our understanding of the impact and experiences of global migration. The paper by Levitt and de la Dehesa (2003) explores the policies and strategies of the sending state in relation to their emigrants and investigates the reasons for policy convergences and divergences. While the issues examined in the paper continue to be relevant there are other areas and methodological approaches that need to be developed and/or included in contemporary studies of sending state led transnationalism explored in this piece. These include the need for research to take a multi-level approach to include the different actors involved and their interactions; longitudinal analysis that examines the heterogeneous and complex nature of contemporary migration flows, the changing situations in sending and destination countries and among migrants and the need to incorporate the second and subsequent generations into research.     

Transnationalism and Agency in East Malaysia: Filipina Migrants in the Nightlife Industries

East Malaysia's vibrant nightlife is a lucrative industry employing many Filipina migrants. The paper addresses the impact on Filipinas of discursive regimes of work, the state and family. These are derived from national discourses of ethnicity, class and nation intertwined with dominant discourses of womanhood in both Malaysia and the Philippines. The paper argues that in transnational space disciplinary regimes are heavily constraining, but resistance and negotiation are possible. The paper follows a feminist poststructuralist approach, which finds that disciplinary forces, rather than being coercive, are subtly inculcated in the migrant subject. Embodiment is never absolute and everyday actions of women initiate instability in the category ‘Woman’. This offers the opportunity for agency. Ethnographic methods are used to explore the tensions and constraints of the Filipinas' everyday experience of migration. In the setting of a largely non‐Muslim East Malaysia, ethnic identity seems differently constructed than in a predominantly Muslim Peninsula Malaysia. Through friendship and marriage with Malaysians, and integration into local communities, Filipinas are able to resist and negotiate their migrant status. The actions of Filipinas and their local Malaysian partners contest conservative notions of ethnicity, gender, class and nation in both the Philippines and Malaysia. This offers a potential for agency for Filipinas, the possibility for which could also extend to the largely non‐Muslim local Malaysians with whom they share their lives.     

Transnationalism reloaded: the historical trajectory of a concept

In this commentary, I discuss the importance of Portes, Guarnizo and Landolt’s article, focusing on three specific points. First, I argue that this 1999 article represented a turning point in transnational migration studies, in that it made it possible to address important weaknesses in this field of study. Second, I reflect on the article’s lack of reference to the nation-state and its power to shape transnational fields. Third, I argue that the cumulative knowledge gained over the last two decades – triggered in part by the claims of this 1999 article – have been steadily integrated into this field of investigation, rendering possible important theoretical alterations. These insights have made possible a shift towards a new stance, a transnational perspective whose specific epistemology makes it possible to develop explanatory frameworks for current transformation processes and to revise social theory more generally.     

Belonging to the nation: generational change,identity and the Chinese diaspora

This study reviews developments in the ethnic and national identity of the descendants of migrants, taking ethnic Chinese as a case study. Our core question is why, in spite of debates worldwide about identity, exclusion and rights, do minority communities continue to suffer discrimination and attacks? This question is asked in view of the growing incidence in recent years of ‘racial’ conflicts between majority and minority communities and among minorities, in both developed and developing countries. The study examines national identity from the perspective of migrants' descendants, whose national identity may be more rooted than is often thought. Concepts such as ‘new ethnicities’, ‘cultural fluidity’, and ‘new’ and ‘multiple’ identities feature in this examination. These concepts highlight identity changes across generations and the need to challenge and reinterpret the meaning of ‘nation’ and to review problems with policy initiatives designed to promote nation-building in multi-ethnic societies.     

Citizenship,Belonging, and Moldovan Migrants in Post-Soviet Russia

Drawing on ethnographic research among transnational Moldovan households in Moscow, this essay considers how ideals of belonging, assertions of historically inflected rights, and aspirations for mobility are all part of the everyday practice of citizenship. Mobile subjects encountering increasingly restrictive post-Soviet citizenship regimes often recall incorporation into a greater historical polity than their current passports would suggest. Three key areas are examined: the intersection of citizenship regimes and popular understandings of belonging; the sense of rights driven by cultural logics informed by previous history; and the way in which ideals and practices of citizenship are diverse among migrants from apparently homogeneous migration streams. The post-Soviet context where the Soviet promise of enfranchisement continues to inform how people on the margins view citizenship illustrates just how deeply citizenship regimes come to be incorporated into popular understandings of belonging even long after formal citizenship ceases to exist.     

Somalia and the Dissolution of the Nation-State 818–824

Anthropologists appear less interested in examining the dissolution of the nation-state than other social scientists. This is curious. Theoretically we may already possess tools for understanding conditions of dissolution. More significantly, we often are inadvertently caught within such situations. The ongoing dissolution of nation-states such as Somalia should thus raise questions about structure, perspective, and the role of anthropologists.     

Adolescent Movements: Dating,Elopements, and Youth Policing in Ladakh,India

ABSTRACT

In India's northwest border region of Ladakh, norms of sexuality are changing, which is resulting in the emergence of new sexual practices, such as dating, ‘roaming’, and the dramatic elopements of Buddhist and Muslim youth. This has caused the emergence of youth policing the perceived sexual infractions of others, through targeting particular zones of intimacy – marriage, religious identity, and mobility. Yet, youth policing is uneven, targeting those considered to be the most ‘at risk’ for moral transgressions, including Buddhists, the elite, and those pursuing education. Ladakhi youth are in a tenuous position, where they negotiate their desires to be ‘modern’ with the community pressure to maintain a strong sense of cultural identity. This paper examines how youth navigate between tensions of modernity and culture, showing that they employ a range of strategic practices and tactics that provide space for expressing desires for modernity, while simultaneously securing cultural loyalty.     

Constructing a Wild Mushroom Panopticon: The Extension of Nation-State Control over the Forest Understory in Oregon,USA

Constructing a Wild Mushroom Panopticon: The Extension of Nation-State Control over the Forest Understory in Oregon, USA. For most of the 20^th century, wild mushrooms on national forests in the United States fell under a de facto open-access management regime. As consumer demand for wild mushrooms increased, a nation-state wild mushroom management regime based on the use of disciplinary power emerged on many national forests in the Pacific Northwest region. Data from an ethnographic study conducted during the late 1990s illustrate how the simultaneous application of three core surveillance technologies—categorization, monitoring, and tracking, and the creation of a panopticon surveillance system—enabled the Forest Service to enforce nation-state claims to wild mushrooms. The data indicate that many pickers are unsupportive of the new regulatory system because it has transformed what was once their living space into a working place. Pickers also point out that the system does little to protect or enhance the growth of wild mushrooms. The study supports conclusions from previous studies that disciplinary power techniques play a critical role in the capacity of modern states to extend their control over mobile populations and natural resources.