Academic literature on the topic 'Migratory change'
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Journal articles on the topic "Migratory change"
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Morganti, Michelangelo. "Birds facing climate change: a qualitative model for the adaptive potential of migratory behaviour." Rivista Italiana di Ornitologia 85, no. 1 (December 23, 2015): 3. http://dx.doi.org/10.4081/rio.2015.197.
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Recent climate change is altering the migratory behaviour of many bird species. An advancement in the timing of spring events and a shift in the geographical distribution have been detected for birds around the world. In particular, intra-Palearctic migratory birds have advanced arrivals in spring and shortened migratory distances by shifting northward their wintering grounds. These changes in migratory patterns are considered adaptive responses facilitating the adjustment of the life cycle to the phenological changes found in their breeding areas. However, in some cases, populations exposed to the same selective pressures do not show any appreciable adaptive change in their behaviour. Basing on the comparison of realized and non-realized adaptive changes, I propose here the formulation of a qualitative model that predicts the potential of migratory birds populations to change adaptively their migratory behaviour. The model assumes that the adaptive potential of migratory behaviour is fuelled by both genetic diversity and phenotypic plasticity. Populations of long-distance migrants are exposed to strong environmental canalization that largely eroded their phenotypic plasticity and reduced genetic variability, so that they show a very low amount of adaptive potential regarding migratory behaviour. On the contrary, partial-migrant populations have a highly varied genetic profile and are more plastic at the phenotypic level, and consequently show the highest amount of adaptive potential. Species with mainly social and mainly genetic determination of the migratory behaviour are separately treated in the model. Specific empirical models to foresee the adaptive strategies of wild bird populations that face to climate change can be derived from the general theoretical model. As example, a specific model about the shortening of migratory distances in Western European migratory bird is presented. Finally, a number of future research lines on the topic of adaptive potential of migratory behaviour are discussed, including some examples of concrete study cases. In conclusion, partial-migration emerge as the less known system and future research efforts on this topic are expected to be especially fruitful.
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Nourani, Elham, Noriyuki M. Yamaguchi, and Hiroyoshi Higuchi. "Climate change alters the optimal wind-dependent flight routes of an avian migrant." Proceedings of the Royal Society B: Biological Sciences 284, no. 1854 (May 3, 2017): 20170149. http://dx.doi.org/10.1098/rspb.2017.0149.
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Migratory birds can be adversely affected by climate change as they encounter its geographically uneven impacts in various stages of their life cycle. While a wealth of research is devoted to the impacts of climate change on distribution range and phenology of migratory birds, the indirect effects of climate change on optimal migratory routes and flyways, through changes in air movements, are poorly understood. Here, we predict the influence of climate change on the migratory route of a long-distant migrant using an ensemble of correlative modelling approaches, and present and future atmospheric data obtained from a regional climate model. We show that changes in wind conditions by mid-century will result in a slight shift and reduction in the suitable areas for migration of the study species, the Oriental honey-buzzard, over a critical section of its autumn journey, followed by a complete loss of this section of the traditional route by late century. Our results highlight the need for investigating the consequences of climate change-induced disturbance in wind support for long-distance migratory birds, particularly species that depend on the wind to cross ecological barriers, and those that will be exposed to longer journeys due to future range shifts.
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Howard, Christine, Philip A. Stephens, Joseph A. Tobias, Catherine Sheard, Stuart H. M. Butchart, and Stephen G. Willis. "Flight range, fuel load and the impact of climate change on the journeys of migrant birds." Proceedings of the Royal Society B: Biological Sciences 285, no. 1873 (February 21, 2018): 20172329. http://dx.doi.org/10.1098/rspb.2017.2329.
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Climate change is predicted to increase migration distances for many migratory species, but the physiological and temporal implications of longer migratory journeys have not been explored. Here, we combine information about species' flight range potential and migratory refuelling requirements to simulate the number of stopovers required and the duration of current migratory journeys for 77 bird species breeding in Europe. Using tracking data, we show that our estimates accord with recorded journey times and stopovers for most species. We then combine projections of altered migratory distances under climate change with models of avian flight to predict future migratory journeys. We find that 37% of migratory journeys undertaken by long-distance migrants will necessitate an additional stopover in future. These greater distances and the increased number of stops will substantially increase overall journey durations of many long-distance migratory species, a factor not currently considered in climate impact studies.
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Doko, Tomoko, Wenbo Chen, and Hiroyoshi Higuchi. "DEVELOPMENT OF MATCHED (MIGRATORY ANALYTICAL TIME CHANGE EASY DETECTION) METHOD FOR SATELLITE-TRACKED MIGRATORY BIRDS." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences III-2 (June 2, 2016): 61–68. http://dx.doi.org/10.5194/isprsannals-iii-2-61-2016.
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Satellite tracking technology has been used to reveal the migration patterns and flyways of migratory birds. In general, bird migration can be classified according to migration status. These statuses include the wintering period, spring migration, breeding period, and autumn migration. To determine the migration status, periods of these statuses should be individually determined, but there is no objective method to define 'a threshold date' for when an individual bird changes its status. The research objective is to develop an effective and objective method to determine threshold dates of migration status based on satellite-tracked data. The developed method was named the “MATCHED (Migratory Analytical Time Change Easy Detection) method”. In order to demonstrate the method, data acquired from satellite-tracked Tundra Swans were used. MATCHED method is composed by six steps: 1) dataset preparation, 2) time frame creation, 3) automatic identification, 4) visualization of change points, 5) interpretation, and 6) manual correction. Accuracy was tested. In general, MATCHED method was proved powerful to identify the change points between migration status as well as stopovers. Nevertheless, identifying “exact” threshold dates is still challenging. Limitation and application of this method was discussed.
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Doko, Tomoko, Wenbo Chen, and Hiroyoshi Higuchi. "DEVELOPMENT OF MATCHED (MIGRATORY ANALYTICAL TIME CHANGE EASY DETECTION) METHOD FOR SATELLITE-TRACKED MIGRATORY BIRDS." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences III-2 (June 2, 2016): 61–68. http://dx.doi.org/10.5194/isprs-annals-iii-2-61-2016.
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Satellite tracking technology has been used to reveal the migration patterns and flyways of migratory birds. In general, bird migration can be classified according to migration status. These statuses include the wintering period, spring migration, breeding period, and autumn migration. To determine the migration status, periods of these statuses should be individually determined, but there is no objective method to define 'a threshold date' for when an individual bird changes its status. The research objective is to develop an effective and objective method to determine threshold dates of migration status based on satellite-tracked data. The developed method was named the “MATCHED (Migratory Analytical Time Change Easy Detection) method”. In order to demonstrate the method, data acquired from satellite-tracked Tundra Swans were used. MATCHED method is composed by six steps: 1) dataset preparation, 2) time frame creation, 3) automatic identification, 4) visualization of change points, 5) interpretation, and 6) manual correction. Accuracy was tested. In general, MATCHED method was proved powerful to identify the change points between migration status as well as stopovers. Nevertheless, identifying “exact” threshold dates is still challenging. Limitation and application of this method was discussed.
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Sudarsono, Hamim, Rosma Hasibuan, and Damayanti Buchori. "BIOLOGI DAN TRANSFORMASI BELALANG KEMBARA LOCUSTA MIGRATORIA MANILENSIS MEYEN (ORTHOPTERA: ACRIDIDAE) PADA BEBERAPA TINGKAT KEPADATAN POPULASI DI LABORATORIUM." Jurnal Hama dan Penyakit Tumbuhan Tropika 5, no. 1 (March 12, 2005): 24–31. http://dx.doi.org/10.23960/j.hptt.1524-31.
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Biology and Transformation of the Migratory Locust Locusta migratoria manilensis Meyen (Orthoptera: Acrididae) at Several Laboratory Population Density Levels. The migratory locust, Locusta migratoria manilensis Meyen (Orthoptera: Acrididae) is one of insect pests in Indonesia that undergoes a unique polymorphic biology. The locust develops a transformation phase which is triggered mainly by high population density. Its recent outbreaks in several regions of Indonesia cause major concern and control strategies must be developed to strengthen control efforts in the future. Its unique polymorphic phenomenon, therefore, must be investigated thoroughly for the basis of management of the outbreak. Due to its agility and its long range flying ability, the most realistic technique to study behavioral and morphological change of the locust is in controlled condition at a laboratory or a green house facility. The experiment was aimed to study effects of colony densities on the biology and transformation process of the migratory locust. More specifically, the experiment was to study effects of population density on the feeding activity, mortality rate, and the ratio of F/C and E/F of the migratory locust L. migratoria manilensis. The population densities were simulated in colonies at 2, 5, 10, 20, dan 30 couples per cage (cage size: 45x45x90 cm) reared in a green house. Results of the experiment show that, in general, higher densities of the migratory locust colonies tended to feed more rigorously than those of the less dense colonies. The locust remained in solitary phase at the density of 2-5 couples per cage whereas the transient phase occured at the density of 10-20 couples per cage. The colonies transformed to gregarious stage when their densities were 30 couples per cage or higher. Mortality percentage tended to be higher at colonies with higher density, especially for the third instar of the migratory locust.
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Prytula, E. D., A. E. McKellar, L. Schwitters, and M. W. Reudink. "Rapid advancement of spring migration and en route adjustment of migration timing in response to weather during fall migration in Vaux’s Swifts (Chaetura vauxi)." Canadian Journal of Zoology 100, no. 1 (January 2022): 56–63. http://dx.doi.org/10.1139/cjz-2021-0089.
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Climate change has generated earlier springs, later falls, and different weather patterns. These changes may prove challenging to migratory species if they are unable to adjust their migratory timing. We analyzed changes in migratory timing of Vaux’s Swifts (Chaetura vauxi (J.K. Townsend, 1839)) by examining first arrivals (date the first swift arrived) and peak roost occupancy (date the maximum number of swifts were observed) at migratory roosts in both spring and fall from the citizen science organization Vaux’s Happening. First arrivals and peak occupancy date in Vaux’s Swifts advanced over time from 2008 to 2017, and the timing of first arrivals advanced with an increase in local wind gust speeds. In contrast, fall migration timing did not change over time from 2008 to 2016, but higher temperatures were associated with later fall migration (both first arrival and peak roost occupancy) and higher local wind speeds were associated with earlier fall migration (peak roost occupancy only). Like many other migratory birds, Vaux’s Swifts may be tracking earlier spring phenology, and may also be altering their migratory timing in response to local weather conditions, especially during fall migration. Our results indicate that swifts may be able to adjust their migration to a changing climate, at least in the short term.
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Taylor, Caz M., Andrew J. Laughlin, and Richard J. Hall. "The response of migratory populations to phenological change: a Migratory Flow Network modelling approach." Journal of Animal Ecology 85, no. 3 (February 11, 2016): 648–59. http://dx.doi.org/10.1111/1365-2656.12494.
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Watts, Heather E., Jeffrey L. Rittenhouse, Kendra B. Sewall, and J. Michael Bowers. "Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins." Animal Migration 6, no. 1 (January 1, 2019): 19–27. http://dx.doi.org/10.1515/ami-2019-0001.
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Abstract Although the endocrine system likely plays an important role in orchestrating the transition to a migratory state, the specific mechanisms by which this occurs remain poorly understood. Changes in glucocorticoid signaling are one proposed mechanism that may be important in migratory transitions. Although previous work has focused on the role of changes in circulating glucocorticoids, another potential mechanism is changes in the expression of its cognate receptors. Here, we test this hypothesis by comparing mRNA expression of the genes for the mineralocorticoid receptor (MR) and glucocorticoid receptor (GR) in two brain regions implicated in the regulation of migratory behavior (the hippocampus and hypothalamus) in pine siskins (Spinus pinus) sampled before or after the transition to a spring nomadic migratory state. Compared to pre-migratory birds, migratory birds had body conditions more indicative of physiological preparations for migration (e.g., larger body mass), and greater levels of nocturnal migratory restlessness. However, we found no differences between pre-migratory and migratory birds in the expression of GR or MR mRNA in either the hippocampus or hypothalamus. Thus, differences in expression of receptors for glucocorticoids do not appear to underly the observed differences in physiology and behavior across a migratory transition. Taken together with previous results showing no change in circulating corticosterone levels during this transition, our findings provide no evidence for a role of glucocorticoid signaling in the spring migratory transition of this species.
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Holling, C. S. "TEMPERATE FOREST INSECT OUTBREAKS, TROPICAL DEFORESTATION AND MIGRATORY BIRDS." Memoirs of the Entomological Society of Canada 120, S146 (1988): 21–32. http://dx.doi.org/10.4039/entm120146021-1.
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AbstractEcosystems that are managed for resource production are under continual structural change. Changes imposed by local management aggregate to produce regional patterns and new regionwide responses. Anthropogenic influences on hemispheric and global processes add another level of change. The result is a bewildering variety of real or anticipated changes unique to experience. For example, in the spruce/fir and budworm interaction of eastern North America, a syndrome of causes affects the vulnerability of renewable resources, and the triggers of change can never be predicted. Yet, it is possible to identify key features that affect resilience of ecosystems and robustness of regulation and to reject other possibilities. This approach provides a way to assign priorities for research and for contingency planning to adapt to change.
Dissertations / Theses on the topic "Migratory change"
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Doswald, Nathalie. "Potential effects of climate change on the distribution and migration of European breeding migratory birds." Thesis, Durham University, 2009. http://etheses.dur.ac.uk/255/.
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Aim: This thesis aims to investigate the potential impacts of climatic change on Afro-Palaearctic migratory birds by investigating simulated changes in breeding and non-breeding distribution. Methods: Generalised Additive Models were used to determine those climatic variables that produced the most robust species distribution models. Tests on the performance of three regression-based techniques were undertaken and consensus modelling framework was subsequently chosen. This framework was used in conjunction with three general circulation models and two emission scenarios to model the future distributions of Afro-Palaearctic migratory birds. Changes in both breeding and non-breeding range and migratory distance were examined for groups of species. A vulnerability index was created to indicate those species that were most vulnerable to climate change. Finally, changes in recent population trends observed on the European breeding grounds were related to simulated climatic suitability to investigate the role of climate in recent population changes and determine the vulnerability of populations to climate change. This analysis also enabled a partial validation of species distribution models. Results: The results indicate differential change on the breeding and non-breeding grounds for many species. For many migratory birds a progressive separation of the two ranges is projected, potentially increasing migratory distances in future. However, for some species newly suitable climatic areas may provide non-breeding areas closer to the breeding range, enabling species to adapt to climatic change. Trans-Saharan migrants, species residing in dry environments as well as montane and coastal species are projected to be most vulnerable to climatic change. Although a link between population trends and climatic suitability could be found, the results indicated, as might be expected, that climate is only one of a number of factors potentially contributing to population changes Conclusion: This thesis gives the first broad analysis of the likely direction and magnitude of change of the distribution of migratory birds to climate change, when only climate is considered. The challenge ahead is to refine these coarse scale models to include habitat and demographic data so as to provide more realistic estimates of change and improve conservation strategies that aim to support species under climate change.
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Morrison, C. A. "Causes of population change in a long-distance migratory passerine, the willow warbler (Phylloscopus trochilus)." Thesis, University of East Anglia, 2011. https://ueaeprints.uea.ac.uk/38823/.
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Brunner, Alicia Rae Brunner. "The Winter Ecology and Response to Environmental Change of a Neotropical Migratory Songbird: the Swainson’s Warbler." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525441285908047.
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Macias-Duarte, Alberto. "Change in Migratory Behavior as a Possible Explanation for Burrowing Owl Population Declines in Northern Latitudes." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/145395.
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Recent observed changes in bird distributions provide an unprecedented opportunity to gain a deeper understanding of the processes that influence species' persistence. By modelling presence-absence data from the North American Breeding Bird Survey, we found evidence that the breeding range of the western burrowing owl has contracted at its northern, western, and eastern boundaries since 1967. We suggest that the species' breeding distribution is also expanding southwards to former wintering grounds into northern Mexico, facilitated by the appearance of new breeding habitat created by irrigated agriculture in the arid areas of southwestern United States and northwestern Mexico. This dissertation explores the hypothesis that burrowing owls from northern migratory populations have become resident breeders in areas of northwestern Mexico that were formerly used only by migratory owls during winter, contributing to both population declines near the northern extent of the species' breeding range and population increases in the southern half of the species' range. We used novel DNA microsatellite markers to test patterns of gene flow predicted by this migration-mediated range-shift hypothesis. We genotyped 1,560 owls from 36 study locations in Canada, Mexico, and the United States. Analyses of molecular variance provided evidence that burrowing owl populations in both northwestern Mexico and Canada are genetically different from the rest of the populations in the breeding range, lending some support to the migration-mediated range-shift hypothesis. We found evidence of subtle genetic differentiation associated with subtropical irrigated agricultural areas in southern Sonora and Sinaloa, demonstrating that land use can produce location-specific population dynamics leading to genetic structure even in the absence of dispersal barriers. We also used stable isotopes 2/H, 13/C, and 15/N in feathers to test philopatry and breeding dispersal patterns predicted by this migration-mediated range-shift hypothesis. Burrowing owl populations near the northern edge of the species' breeding range had a high proportion of immigrants compared to interior populations, while other populations had high levels of philopatry. Stable isotopes also provided evidence of breeding dispersal events from Canadian populations to northwestern Mexico in support of the migration-mediated range-shift hypothesis, but similar isotope signatures in nestling feathers between these two regions prevent stronger inferences.
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Hedlund, Johanna. "Climate change effects on migratory birds and on the ecology and behaviour of the willow warbler (Phylloscopus trochilus)." Doctoral thesis, Stockholms universitet, Zoologiska institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-120409.
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Recent global climate change is influencing the behaviour and ecology of species worldwide. Birds are typical systems to study in this context, as they are often migratory and thus subjected to a variety of environmental effects. This thesis employs the use of long-term ringing records, field observations, historical maps and historical volunteer observations with the aim of describing behavioural and ecological responses of birds to the current environmental change. An investigation into the spring arrival, reproduction and autumn departure in willow warblers (Phylloscopus trochilus) breeding at a southern study site in Sweden (65°N 18°E) showed that all three phenological events had advanced in parallel. Thus birds arrive earlier, start breeding earlier and leave Sweden earlier, with the breeding period staying the same in length. By teasing apart the migratory responses of different individuals, it became clear that particularly early arriving males and early departing juveniles had advanced migration. However, willow warblers migrating past a northern study site in Sweden (65°N 23°E) displayed no change in autumn departure. When migration in the two regionally separate populations were analyzed in relation to climatic variables, the results indicated that foremost a combined effect of growing season onset and the North Atlantic Oscillation influenced migratory timing, and only in individuals that had advanced migration. As growing season onset had advanced at both regions, but only elicited migratory change in southern willow warblers, it is proposed that intra-specific difference between populations prepare them differently to climate change. Willow warblers breeding at northern latitudes were also displaying absence of an otherwise common behaviour of the species: philopatry. It is suggested that the climate induced change in onset of the growing season, coupled with an increase in available territories, could have enabled a southern influx of dispersal-prone birds adopting a less philopatric breeding behaviour. Availability of territories was also studied in southern Sweden, in relation to 100 years of land use change and future climate change effects on forestry. The mass-conversion of grazed forest into coniferous sylvicultures that has occurred in Sweden 1900-2013 was shown to have negatively affected territory availability for willow warblers. The second most common bird species in Sweden, the chaffinch (Fringilla coelebs), was however shown to be largely unaffected. In a future scenario where rising temperatures will increase growth rates of trees, harvest rotation will be faster and both sylvicultures and logged areas will increase in coverage, favouring both species. Thus commonness in terms of landscape and species occurrence has altered historically and is dynamically linked. Historic perspectives were also applied to observations of spring arrival of 14 migratory bird species. A relative comparison of two data sets, collected over 140 years, revealed that short-distance migrants have changed their spring arrival more than long-distance migrants in southern Sweden. In conclusion, the results of this thesis provide insights into climate change effects on avian behaviour and ecology, document unique observations and contribute with a great spectrum of knowledge, from exact details on responses by individual birds, through long-term changes in populations to historical perspectives on shifts in entire landscapesAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.
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Schmidt-Verkerk, Kerstin. "The potential influence of climate change on migratory behaviour - a study of drought, hurricanes and migration in Mexico." Thesis, University of Sussex, 2012. http://sro.sussex.ac.uk/id/eprint/38599/.
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This thesis develops a conceptual and methodological approach to understanding how future climate change is likely to affect migration, and then applies this approach to explore the likely effects of climate change on different migration flows in and from Mexico. Scientific and policy interest in the climate change-migration nexus has been growing over the last decade, yet empirical results remain inconclusive. Existing approaches are often conceptually and methodologically unconvincing as they assume a linear relationship between climate change and migration, or try to separate climate stressors from other factors involved in migration decisions. Furthermore, most current research into the climate-migration nexus has focused on a relatively simple framing of localised environmental pressures forcing people to migrate. In contrast, this thesis acknowledges the complexity of migration and suggests that climate change is likely to affect factors involved in migration decisions at the local and the global level. It develops a more realistic understanding of the potential effect of climate change on migration by examining the impact of the local and global consequences of climate change on livelihood stressors and other factors involved in migration decisions. This thesis adopts a qualitative and comparative approach to illustrate this concept, based on fieldwork in Zacatecas and Veracruz, two Mexican states with different migration profiles and different local climate stressors. It analyses the factors involved in migration decisions, which include livelihood stressors but also networks, recruiters and individual agency. A risk matrix is then developed to explore the climate sensitivity of the various factors that influence internal and international migration flows. It analyses the extent to which each factor is likely to be affected by climate change in combination with the relevance of this factor for the migration decision-making process. This approach allows identifying those factors that, affected by future climate change, have the highest potential to impact on existing migration patterns. It also allows a comparison between different migration flows. Results suggest that climate change is likely to have moderate effects on migration, mainly on internal rural flows. Alarmist predictions of large numbers of 'climate change refugees' are thus inappropriate and policies should instead focus on the factors projected to impact most on migration under scenarios of future climate change. Policies should also aim at mitigating the negative effects of climate change on people's livelihoods and at protecting migrants and non-migrants.
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Campeau, Allen. "Remotely-sensed changes in the primary productivity of migratory caribou calving grounds and summer pasture : the mixed influences of climate change and caribou herbivory." Master's thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/27199.
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Nous avons utilisé la télédétection pour examiner comment l’abondance du caribou migrateur pouvait influencer la quantité de ressources alimentaires, et comment ces changements pouvaient affecter la dynamique de population et les patrons d’utilisation de l’espace des caribous. Nous avons évalué les relations entre le caribou et ses ressources alimentaires pour l’aire de mise bas et l’aire d’estivage du troupeau Rivière-George (TRG) du nord du Québec et du Labrador (Canada) entre 1991 et 2011. Nous avons modélisé les relations entre la productivité primaire et des variables climatiques, nous permettant d’isoler les effets d’autres facteurs, comme la pression de broutement des caribous. Nous avons trouvé une relation négative entre la densité de caribous et la productivité primaire à grande échelle, suggérant que la pression de broutement par les caribous pouvait réduire l’abondance des ressources alimentaires et contribuer à la dégradation de l’habitat. Une forte tendance au réchauffement durant la période d’étude, couplée avec un déclin de la taille de population du TRG, a cependant entrainé une productivité primaire plus élevée. Cette hausse de la productivité primaire pourrait représenter un rétablissement de la végétation suite à la réduction de la pression de broutement et/ou un effet du réchauffement climatique.This thesis used remote sensing to examine how changes in caribou abundance can impact forage availability, and how these changes might in turn affect the population dynamics and space use patterns of migratory caribou. We investigated these relationships for the Rivière-George caribou herd (RGH) and its calving grounds and summer range in Northern Quebec and Labrador (Canada) from 1991-2011. We modelled the relationships between primary productivity and various climatic variables, allowing us to isolate the effects of non-climatic factors, such as caribou herbivory, on primary productivity. We found a negative relationship between caribou density and primary productivity at the range-scale, suggesting that caribou herbivory can reduce forage abundance and contribute to habitat degradation. However, a strong warming trend over the study period, coupled with a decline in RGH population size, meant that we observed a trend towards higher primary productivity. This greening trend may represent vegetation recovery following the reduction in caribou herbivory and/or an effect of climate warming.
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Xenophontos, Marina. "Ecology of the endemic migratory passerine Cyprus Wheatear Oenanthe cypriaca : the effects of climate change on a restricted range species." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/11967.
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Migrant birds may be vulnerable to climate change at different stages of their annual cycles especially on the breeding grounds, where changes in phenology may affect their ability to synchronise breeding with the peak of resources availability. Understanding how phenology of breeding, survival and productivity varies between and within years is therefore crucial to understand migrant population dynamics. This thesis describes this variation in the Cyprus Wheatear Oenanthe cypriaca, with particular emphasis on a colour-ringed population at Troodos, Cyprus, 2010-2012. Our results suggest that the phenology of breeding of Cyprus Wheatear is variable with breeding onset and number of breeding attempts probably varying with annual temperature variation. Minimum true survival rates were very high for a small passerine migrant, although they were probably sufficiently annually variable to profoundly affect annual population dynamics. For productivity, nest survival was very high and did not vary between years, or nesting attempts, or with clutch initiation date but it was significantly higher in the chick stage versus the egg stage. Post-fledging survival in the first 4 weeks was very high. Renesting probability was significantly different in all years, yet total productivity per pair was the same in each of three years. Cyprus Wheatears at Troodos showed such high productivity and survival that the population must be a major source population and this was reflected in the very high density of breeding pairs at the study site. Finally we used altitude as a proxy for variation in temperature and investigated how abundance, productivity and phenology in Cyprus Wheatears varied between and within years, from sea level to 1952m, using transect surveys to record breeding birds across Cyprus. Cyprus Wheatears were common in all habitats and altitudes; altitudinal temperature variation probably affected the occurrence of double brooding and so the timing of chick production, but not the onset of breeding. The results suggest that Cyprus Wheatears are already very well adapted to high variation in temperature within and between seasons, changing investment accordingly.
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Stokes, Kimberley Laura. "Ecology of marine turtles under climate change." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/21847.
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Climate change threatens to disrupt biological systems around the globe, sparking debate over natural capacity for adaptation in a fragmented landscape. Marine turtles are evolutionarily ancient and have survived millions of years of prehistoric climate change, but are threatened by the rapidity of modern warming and a history of severe overexploitation that has left most populations depleted. This thesis explores a nesting aggregation of the green turtle (Chelonia mydas) in northern Cyprus, where a longitudinal programme of both intensive and extensive monitoring enables insight into individual and population level parameters and processes. Nesting on the two coastlines covered by this project is in the early stages of recovery, possibly in response to exhaustive nest protection efforts over the last twenty years. Saturation tagging at one key site allows us to confirm that recruitment of new breeders is an important driver of this trend, and that average clutch frequency has remained stable around three nests per female per year, validating nest-count derived abundance estimates at a regional scale. Concern has been raised, however, regarding recent changes in fishing practices which are impacting the local juvenile neritic phase, which may have a lagged effect on the recovery of this nesting population. A collaborative tracking effort including all other countries with major nesting in the Mediterranean allows us to identify major foraging grounds for this species, with two hotspots accounting for >50% of tracked individuals, as well as coastal and pelagic seasonal corridors of high use. Bycatch levels and mortality rates for turtles in these key areas are largely unknown and should be prioritised for investigation. Hatchling sex ratios from the main study beach are extremely female-biased (estimated 97% female for the twenty year period 1993-2012). A 1oC rise in average incubation temperatures threatens near complete hatchling feminisation on this beach, whilst a 2oC rise could reduce hatch success to less than 50%. Thermal effects on hatchling morphometrics are evident, with a 1oC rise in temperature reducing average length, width and weight by 1%, 2% and 3% respectively. More favourable incubation conditions were found early in the season, in deeper nests laid by larger females, and on beaches of lighter sand. In contrast, adult sex ratios at the main site are male-biased, posing questions regarding sex-specific survival rates and optimal hatchling sex ratios. A phenological shift towards earlier nesting is demonstrated for the first time in this species, and could potentially ameliorate warming effects. Carry-over climate forcing effects from the foraging ground influence the breeding frequency of individuals, driving population level responses in annual magnitude of nesting. This work emphasises the utility and necessity of long-term individual-based monitoring programmes in elucidating population trends and climate responses in iteroparous species with non-annual breeding.
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Schäfer, Merlin [Verfasser], Florian [Akademischer Betreuer] Jeltsch, Stephanie [Akademischer Betreuer] Kramer-Schadt, Marina [Akademischer Betreuer] Müller, Florian [Gutachter] Jeltsch, Karin [Gutachter] Frank, and Ulrich [Gutachter] Brose. "Understanding and predicting global change impacts on migratory birds / Merlin Schäfer ; Gutachter: Florian Jeltsch, Karin Frank, Ulrich Brose ; Florian Jeltsch, Stephanie Kramer-Schadt, Marina Müller." Potsdam : Universität Potsdam, 2019. http://d-nb.info/1218405287/34.
Full textBooks on the topic "Migratory change"
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Migratory birds and global change. Washington: Island Press, 2010.
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DeGraaf, Richard M. Neotropical migratory birds: Natural history, distribution, and population change. Ithaca: Comstock Publishing Associates, 1995.
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International Workshop on Developing Indicators of Climate Change for Migratory Species (2007 University of East Anglia). Indicators of the impact of climate change on migratory species. Thetford, Norfolk , UK: British Trust for Ornithology, 2008.
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International Workshop on Developing Indicators of Climate Change for Migratory Species (2007 University of East Anglia). Indicators of the impact of climate change on migratory species. Thetford, Norfolk , UK: British Trust for Ornithology, 2008.
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Cox, George W. Bird migration and global change. Washington: Island Press, 2010.
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Turner, Dorothea. The migratory behaviour of lotic macroinvertebrates, and the implications of genotypic and phenotypic variation in studies of their dispersal and response to environmental change. Ottawa: National Library of Canada, 1996.
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Programme, United Nations Development. Human development report 2009: Overcoming barriers : human mobility and development. New York: United Nations, 2009.
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Great Britain. Dept. for Environment, Food & Rural Affairs, United Nations Environment Programme, and Secretariat, Convention on Migratory Species, eds. Migratory species and climate change: Impacts of a changing environment on wild animals. Bonn, Germany: UNEP, 2006.
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Ilya, Maclean, ed. The effects of climate change on migratory waterbirds within the African-Eurasian flyway. Thetford, Norfolk: British Trust for Ornithology, 2007.
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Ricucci, Roberta. Ethnicity, Identity and Faith in the Current Migratory Crisis: Continuity and Change in Migrants' Religiousness in Southern Europe. Springer International Publishing AG, 2021.
Find full textBook chapters on the topic "Migratory change"
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Evans, Peter R. "Migratory birds and climate change." In Past and Future Rapid Environmental Changes, 227–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60599-4_18.
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Dolman, Paul M. "Migratory birds: Simulating adaptation to environmental change." In Past and Future Rapid Environmental Changes, 389–400. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60599-4_30.
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Ricucci, Roberta. "It is Time to Change Perspective: Outside the Framework—Muslim Exceptions." In Ethnicity, Identity and Faith in the Current Migratory Crisis, 105–20. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-84056-3_7.
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Van Nguyen, Quang. "The Effect of Climate Change and Natural Disasters on Mangrove Forests in Xuan Thuy National Park: Proposed Adaptation Measures for Mangrove Forests." In Interlocal Adaptations to Climate Change in East and Southeast Asia, 141–44. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-81207-2_14.
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AbstractXuan Thuy National Park (XTNP), the first Ramsar site in Southeast Asia, is located in a low-lying coastal region in Nam Dinh Province of Vietnam. Most of the core zone of the XTNP is comprised of mangrove forests, which are inhabited by 222 indigenous and migratory bird species, 202 plant species, 386 invertebrate species, and 154 fishes (Fig. C4.1). Many of these species are rare, including nine endangered birds that are listed in the IUCN Red List of Threatened Species, have been recorded and sighted in the XTNP. The endangered birds are Western Curlew, Black-faced Spoonbill, Saunders’s Gull, Painted Stork, Asian Dowitcher, Spoon-billed Sandpiper, Spot-billed Pelican, Nordmann’s Greenshank, and Chinese Egret (MONRE 2020).
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Van Praag, Lore, Loubna Ou-Salah, Elodie Hut, and Caroline Zickgraf. "Introduction." In IMISCOE Research Series, 1–15. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61390-7_1.
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AbstractThis book aims to demonstrate the complex interplay between environmental change and the development of migration aspirations and trajectories in the Moroccan context. Its objective is to show how environmental changes have resulted in the development of migration aspirations and have caused people to migrate over the last decades and, at an accelerating speed, continue to do so. Migration has been of all times and spaces, and people have migrated, both voluntarily and involuntarily, for environmental, economic, political, humanitarian, social, and cultural reasons (Castles et al. 2014). However, recently, environmental changes seem to have put other migration reasons increasingly under pressure (Massey 1990; Massey et al. 1998; Bates 2002; Carling 2002, 2014; De Haas 2010a, b; McLeman and Gemenne 2018b). More particularly, the increasing rate and altering nature of environmental changes add urgency to already existing factors encouraging migration (Evans 2009; TGOFS 2011; IPCC 2014) and even trigger new migratory movements (Gemenne and Blocher 2016).
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Sabeur, Z. A., G. Correndo, G. Veres, B. Arbab-Zavar, J. Lorenzo, T. Habib, A. Haugommard, F. Martin, J. M. Zigna, and G. Weller. "EO Big Data Connectors and Analytics for Understanding the Effects of Climate Change on Migratory Trends of Marine Wildlife." In Environmental Software Systems. Computer Science for Environmental Protection, 85–94. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-89935-0_8.
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Lucassen, Jan, and Donald A. Bloch. "Changes in Systems of Migratory Labour: Summary and Conclusion." In Migrant Labour in Europe, 1600-1900, 206. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003334071-18.
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Akoka, Karen, Olivier Clochard, Iris Polyzou, and Camille Schmoll. "What’s in a Street? Exploring Suspended Cosmopolitanism in Trikoupi, Nicosia." In IMISCOE Research Series, 101–10. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67365-9_8.
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AbstractSituated at the eastern part of the Mediterranean Sea, the island of Cyprus has always been a bridge as well as a border between the Middle East and Europe. It has also been an important place of both emigration and immigration. The situation in Nicosia, the capital city, is marked by decline following the 1974 conflict and partition. At the same time, however, the city has become an important settling place for international migrants, whose presence has grown during the last 20 years. Today Nicosia’s situation lies between a typical south European city (in which migrants find room in the interstices) and a post-war city. Following the growing effort within migration studies to use the street as a laboratory of diversity and cosmopolitanism (Susan Hall), this paper focuses on a single street. Formerly an important business street, Trikoupi Street is now well known as one of the most cosmopolitan streets in Nicosia, in which south Asians, Arabs, Sub-Saharan Africans as well as Eastern Europeans converge. These different populations correspond to different migratory waves as well as different modes of incorporation into local society. In this chapter, we aim to see how the street level may help us to reflect upon important topics in Cyprus such as contested citizenship, urban change, local/global connections, as well as new forms of cohabitation and patterns of subaltern cosmopolitanism. We also aim to reflect upon the multiple temporalities of the neighborhood, in order to show how the history of the street (and the history of the neighborhood) impacts on current ways of life in Trikoupi. We define the current situation as “suspended cosmopolitanism.”
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Jardón Hernández, Ana Elizabeth. "Changes and Continuities in the International Migratory Dynamics of Las Vueltas: Transition Toward a New Migratory Phase?" In International Migration and Crisis, 31–69. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43898-6_3.
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Jung, Philipp Roman. "Multinational Migration in the Global South: Complex and Non-linear Trajectories of Senegalese Migrants in Brazil." In IMISCOE Research Series, 159–78. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12503-4_8.
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AbstractA growing number of studies emphasise the non-linearity of migration. Aspirations and capabilities for multinational migration often develop or change during the migration process. These dynamics have mostly been analysed with regards to movements within the European Union or to countries in the so-called ‘Global North’. This chapter aims to broaden this focus by including movements in the context of South-South migration. It discusses multinational migration by Senegalese migrants in Brazil, which is both a destination and an origin of movements that connect a variety of countries and regions. It analyses the complex trajectories of Senegalese migrants from different social and educational backgrounds and focuses on how decisions to move again from one country to another develop and which factors influence the choice of destination. Through a multi-sited qualitative case study using interview and ethnographic methods with Senegalese migrants in four Brazilian cities – São Paulo, Praia Grande, Caxias do Sul and Passo Fundo – the research examines both already-occurred movements from Cape Verde and Argentina to Brazil and aspirations to migrate further to the ‘Global North’. The findings show that these multinational migrations are mostly driven by the desire for self-improvement – financial, professional or educational – and a hierarchy of desired destinations but also a result of suddenly emerging opportunities and mediation. The movements are facilitated through the multiple transnational ties with which Senegalese migrants are connected to different places. Furthermore, the study shows how Senegalese migrants acquire new migratory capital – for example in the form of another nationality, business activities or access to new networks – and how migration experiences influence onward migration aspirations and preparations, hereby drawing attention to the active learning process which migrants experience during their trajectory.
Conference papers on the topic "Migratory change"
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Duncan, K. "Climate change, migratory species and pandemic influenza." In ENVIRONMENTAL HEALTH RISK 2007. Southampton, UK: WIT Press, 2007. http://dx.doi.org/10.2495/ehr070221.
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Desmawati, Iska, Indah Trisnawati D. T., Ory Kurnia, Albi Hamdani, Mahsun Fahmi, and Mirza Fahmi. "Distribution study on migratory bird (Scolopacidae: Numenius) in Surabaya, Indonesia: Estimating the effect of habitat and climate change." In PROCEEDING OF INTERNATIONAL BIOLOGY CONFERENCE 2016: Biodiversity and Biotechnology for Human Welfare. Author(s), 2017. http://dx.doi.org/10.1063/1.4985399.
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Whelan, Debbie. "Light Touch on the land – continued conversations about architectural change, informality and sustainability." In HERITAGE2022 International Conference on Vernacular Heritage: Culture, People and Sustainability. Valencia: Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/heritage2022.2022.15043.
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Including ‘informally constructed’ buildings in the cornucopia of ‘vernacular’ has its opponents. They are not visually compelling, strongly represent the ‘other’, and their unpopularity derives from worldviews that prioritise ‘architecture’ as modernity rather than, perhaps, ‘buildings’ as humanity. However, it is argued that informal settlements are not only the kernel of new cities (using modern materials), but are inevitable and sanitized by health legislation, with slum ‘clearing’ having different potentials, to ‘slum building’. Considering informal settlements in Pietermaritzburg, South Africa in the early 1920s, and subsequent slum clearances due to post-War health legislation, tracking their continued negative, (and ambivalent connotations at the end of apartheid), and most extensive manifestations in current times, this paper considers informal settlements as recyclers of matter, distinct representations of cultural change (from the rural to the urban) and vectors of opportunity (driven by early health legislations). For the a global north which assumes culturally static societies, advocates for carbon-neutral construction, and renewable construction materials and recycling, there is possibly much we can learn from informal settlements, addressing complex and diverse world views, recycling, political organization and spatial planning. Also, viewed from the lofty perspective of the global north, such vernaculars are viewed derisively, are the focus of multiple, globally-crafted sustainable development goals, and are considered as ‘problems’ rather than, ‘solutions’. Thus, migratory trajectories, social and cultural change, and the continued use of existing and found materials is real for many millions of people globally. These constantly negotiated territories provide compelling ground for re-assessment, reflection and repositioning, interpretation of the vernacular.
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Feliz, Nerea. "Temple in a House." In 2016 ACSA International Conference. ACSA Press, 2016. http://dx.doi.org/10.35483/acsa.intlp.2016.4.
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In 2011, 15 families of the Burmese refugee community on Buffalo’s Westside collectively purchased a vacant house in Buffalo at 349 Plymouth Ave. They wanted to convert the house to a Buddhist temple and residence for three monks. ‘Temple in a House’ is an adaptive project designed in collaboration with local architect and artist Dennis Maher (University at Buffalo), which presented a significant challenge: that of trying to reconcile a very radical change of program, use, and cultural references. Beyond the project’s unique socio-economic characteristics pertaining to Buffalo, this project has global implications. Changing world demographics, as a result of different economic and migratory dynamics, are increasingly asking designers to negotiate complex cultural, social, religious, and economic systems.
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Whately, Lauro, Raquel Pinto, Muralidharan Rangarajan, Liviu Lftode, Ricardo Bianchini, and Claudio L. Amorim. "Adaptive Techniques for Home-based Software DSMs." In Simpósio de Arquitetura de Computadores e Processamento de Alto Desempenho. Sociedade Brasileira de Computação, 2001. http://dx.doi.org/10.5753/sbac-pad.2001.22205.
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This paper proposes and evaluates Home-based Adaptive Protocol (HAP), a software distributed shared-memory system. HAP performs two key functions that distinguish it from most other distributed shared-memory systems: detection of sharing patterns and behavior adaptation based on these patterns. Detection consists of identifying any change in the sharing pattern of a shared page. Adaptation consists of using a strategy that is specific to the sharing pattern detected to optimize the performance of the system. More specifically, HAP uses updates to maintain the coherence of single-writer pages, which fall under the migratory and producer-consumer sharing patterns. Invalidations are used to maintain the coherence of multiple-writer pages, which can potentially be falsely shared. As part of HAP's adaptation strategy, we dynamically assign homes to pages based on their sharing patterns. We performed preliminary experiments on an 8-node cluster of PCs. Our results show that the current implementation of HAP substantially improves the performance of single-writer applications in which shared pages are modified in critical sections protected by locks. The results also indicate potential improvement in the performance of applications exhibiting other sharing patterns such as producer-consumer, single-writer between barriers. However, the detection and adaptation techniques for these patterns have to be redesigned to exploit the real performance gains that can be achieved with the adaptive system.
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Ushakova, V. L. "ДИНАМИКА ЧИСЛЕННОСТИ НАСЕЛЕНИЯ ТИХООКЕАНСКОГО ПОБЕРЕЖЬЯ ДАЛЬНЕГО ВОСТОКА." In Geosistemy vostochnyh raionov Rossii: osobennosti ih struktur i prostranstvennogo razvitiia. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.33833/tig.2019.24.73.012.
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В статье рассматривается динамика численности населения в геополитически и экономически важной территории тихоокеанском побережье Дальнего Востока, как в советские, так и постсоветские годы. Проанализированы проистекающие здесь процессы изменения численности населения в течение длительного периода (19592015 гг.). Прибрежные территории имеют различия демографического развития, обусловленные особенностями освоения, экономикогеографического положения, уровнем социальноэкономического развития. Различия в размерах территории и численности постоянного населения находят отражение в показателе плотности населения, что также оказывает влияние на различия в демографическом потенциале. Демографические процессы протекают по разному в северных и южных муниципальных образованиях, а помимо фактора людности поселений, прибрежное положение накладывает свой отпечаток на них. Так, основной проблемой демографического развития материкового побережья Японского моря остается депопуляция. Только в пяти городских округах отмечается положительная динамика роста населения: Владивостокском, Артемовском, ЮжноСахалинском, ПетропавловскКамчатском и Магаданском. В результате усиливающейся концентрации населения вокруг региональных центров, демографические процессы заметно отличаются от периферийных прибрежных территорий, теряющих свое население. В северных субъектах отмечается значительная зависимость миграционного прироста с созданием крупных добывающих производств, определивших уровень экономического благополучия проживавшего здесь населения. Отток населения связан со сворачиванием добывающих производств в связи с перестроечными реформами. Такие особенности формирования демографического потенциала следует учитывать при разработке программ социальноэкономического развития этих территорий. Отмечается, что демографические процессы в различные периоды здесь проистекали с различной интенсивностью, по этим критериям выделены два разнонаправленных периода: период активного роста населения и период снижения численности населения. Положительная или отрицательная динамика численности населения в большинстве обусловлена влиянием миграционного и естественного движения в сторону роста или сокращения соответственно. Сохранение и наращивание человеческих ресурсов в регионе возможно только в условиях эффективной миграционной политики, направленной на сохранение собственного демографического потенциала и привлечение мигрантов. In the article populations dynamics in the geopolitically and economically important territory the Pacific coast of the Far East, both in the Soviet and PostSoviet years is considered. The processes of populations change occurring there for a long period of time (19592015) have been analyzed. The coastal territories are differed by demographic development conditioned by the features of development, by an economicgeographical position and by the level of socialeconomic development. The distinctions in the sizes of the territory and the number of resident population are reflected in the indicator of populations density, which also influences the distinctions in the demographic potential. The demographic processes occur in different ways in the northern and southern municipal unions. Besides the factor of population size in the settlements, the coastal position has its impact on them. For example, depopulation remains the basic problem of demographic development of the continental coast of the Sea of Japan. Only in five city districts positive dynamics of populations growth has been marked. These are Vladivostok, Artem, YuzhnoSakhalinsk, PetropavlovskKamchatky, and Magadan. As a result of amplifying concentration of the population around the regional centers, the demographic processes considerably differ from the peripheral coastal territories losing their population. In the northern subjects considerable dependence of migratory gain with creation of the large extracting industries, which have defined the level of economic wellbeing of the population living there, is marked. Population outflow is resulted from cutting down of the extracting industries in connection with the reorganization reforms. Such features of formation of the demographic potential should be considered in developing the programs of socialeconomic development of these territories. It is noticed, that there the demographic processes occurred with various intensity during the various periods. Two criteria of the different direction are allocated by these criteria, i.e. the period of active increase in the population and that of the decrease in the population. In a number of cases, positive or negative dynamics of population is caused by the influence of the migratory and natural movements towards growth or reduction respectively. Preservation and an increase in human resources in the region are possible only under the conditions of the effective migratory policy directed to preservation of its own demographic potential and attraction of migrants.
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Ushakova, V. L. "ДИНАМИКА ЧИСЛЕННОСТИ НАСЕЛЕНИЯ ТИХООКЕАНСКОГО ПОБЕРЕЖЬЯ ДАЛЬНЕГО ВОСТОКА." In Geosistemy vostochnyh raionov Rossii: osobennosti ih struktur i prostranstvennogo razvitiia. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.35735/tig.2019.24.73.012.
Full textAbstract:
В статье рассматривается динамика численности населения в геополитически и экономически важной территории тихоокеанском побережье Дальнего Востока, как в советские, так и постсоветские годы. Проанализированы проистекающие здесь процессы изменения численности населения в течение длительного периода (19592015 гг.). Прибрежные территории имеют различия демографического развития, обусловленные особенностями освоения, экономикогеографического положения, уровнем социальноэкономического развития. Различия в размерах территории и численности постоянного населения находят отражение в показателе плотности населения, что также оказывает влияние на различия в демографическом потенциале. Демографические процессы протекают по разному в северных и южных муниципальных образованиях, а помимо фактора людности поселений, прибрежное положение накладывает свой отпечаток на них. Так, основной проблемой демографического развития материкового побережья Японского моря остается депопуляция. Только в пяти городских округах отмечается положительная динамика роста населения: Владивостокском, Артемовском, ЮжноСахалинском, ПетропавловскКамчатском и Магаданском. В результате усиливающейся концентрации населения вокруг региональных центров, демографические процессы заметно отличаются от периферийных прибрежных территорий, теряющих свое население. В северных субъектах отмечается значительная зависимость миграционного прироста с созданием крупных добывающих производств, определивших уровень экономического благополучия проживавшего здесь населения. Отток населения связан со сворачиванием добывающих производств в связи с перестроечными реформами. Такие особенности формирования демографического потенциала следует учитывать при разработке программ социальноэкономического развития этих территорий. Отмечается, что демографические процессы в различные периоды здесь проистекали с различной интенсивностью, по этим критериям выделены два разнонаправленных периода: период активного роста населения и период снижения численности населения. Положительная или отрицательная динамика численности населения в большинстве обусловлена влиянием миграционного и естественного движения в сторону роста или сокращения соответственно. Сохранение и наращивание человеческих ресурсов в регионе возможно только в условиях эффективной миграционной политики, направленной на сохранение собственного демографического потенциала и привлечение мигрантов. In the article populations dynamics in the geopolitically and economically important territory the Pacific coast of the Far East, both in the Soviet and PostSoviet years is considered. The processes of populations change occurring there for a long period of time (19592015) have been analyzed. The coastal territories are differed by demographic development conditioned by the features of development, by an economicgeographical position and by the level of socialeconomic development. The distinctions in the sizes of the territory and the number of resident population are reflected in the indicator of populations density, which also influences the distinctions in the demographic potential. The demographic processes occur in different ways in the northern and southern municipal unions. Besides the factor of population size in the settlements, the coastal position has its impact on them. For example, depopulation remains the basic problem of demographic development of the continental coast of the Sea of Japan. Only in five city districts positive dynamics of populations growth has been marked. These are Vladivostok, Artem, YuzhnoSakhalinsk, PetropavlovskKamchatky, and Magadan. As a result of amplifying concentration of the population around the regional centers, the demographic processes considerably differ from the peripheral coastal territories losing their population. In the northern subjects considerable dependence of migratory gain with creation of the large extracting industries, which have defined the level of economic wellbeing of the population living there, is marked. Population outflow is resulted from cutting down of the extracting industries in connection with the reorganization reforms. Such features of formation of the demographic potential should be considered in developing the programs of socialeconomic development of these territories. It is noticed, that there the demographic processes occurred with various intensity during the various periods. Two criteria of the different direction are allocated by these criteria, i.e. the period of active increase in the population and that of the decrease in the population. In a number of cases, positive or negative dynamics of population is caused by the influence of the migratory and natural movements towards growth or reduction respectively. Preservation and an increase in human resources in the region are possible only under the conditions of the effective migratory policy directed to preservation of its own demographic potential and attraction of migrants.
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Matthieu, Jordan, and Tim Raaijmakers. "Interaction Between Offshore Pipelines and Migrating Sand Waves." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83875.
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Large areas of shallow, sandy seas are covered by migrating tidal sand waves. Sand wave migration rates are on the order of 10s of meters per year, with heights between 10 and 30% of the water depth. If such regions are traversed by pipelines, the dynamic interaction between the rock-berm protection of the pipelines and the migratory sand waves must be accounted for to assure the long term stability of both the rock-berms and pipelines. This study employs a 2DV model to demonstrate the hydrodynamic and morphodynamic interaction between migrating sand waves and a rock-berm constructed perpendicular to the migration direction. The timescale of sand waves and the design life of rock-berm are similar, consequently, rock-berms in sand wave regions experience a change in bed level approximately equal to that sand wave height. Due to the large difference in temporal scales between local erosive processes and sand wave migration, the passing of a sand wave is manifest as a general rising or falling of the ambient seabed, while a rock-berm is fixed at its construction elevation. Consequently, the critical design case is for a rock-berm constructed at a sand wave crest since the surrounding bed level decreases throughout the operational life of the pipeline. A conservative design approach is to construct rock berm protection in a sand wave trough, resulting in rising ambient seabed levels throughout the operational lifetime of the underlying pipeline or electrical cable.
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Lauc, Zvonimir, and Marijana Majnarić. "EU LEGAL SYSTEM AND CLAUSULA REBUS SIC STANTIBUS." In EU 2021 – The future of the EU in and after the pandemic. Faculty of Law, Josip Juraj Strossmayer University of Osijek, 2021. http://dx.doi.org/10.25234/eclic/18352.
Full textAbstract:
We are witnesses and participants of Copernican changes in the world which result in major crises/challenges (economic, political, social, climate, demographic, migratory, MORAL) that significantly change “normal” circumstances. The law, as a large regulatory system, must find answers to these challenges. Primarily, these circumstances relate to (i) the pandemic - Corona 19, which requires ensuring economic development with a significant encroachment on human freedoms and rights; (ii) globalization, which fundamentally changes the concept of liberal capitalism as the most efficient system of production of goods and services and democracy as a desirable form of government; (iii) automation, robotics, artificial intelligence, and big data are changing the ways we work, live, communicate, and learn in a Copernican manner. The law should serve to shape the relationship between people in order to realize a life of love and freedom. This is done to the greatest extent through the constitutional engineering of selected institutions. The legal system focuses on institutions that have a raison d'etre in their mission, which is read as “ratio legis”, as a desirable normative and real action in the range of causal and teleological aspect. Crisis situations narrow social cohesion and weaken trust in institutions. It is imperative to seek constitutional engineering that finds a way out in autopoietic institutions in allopoietic environment. We believe that the most current definition of law is that = law is the negation of the negation of morality. It follows that morality is the most important category of social development. Legitimacy, and then legality, relies on morality. In other words, the rules of conduct must be highly correlated with morality - legitimacy - legality. What is legal follows the rules, what is lawful follows the moral substance and ethical permissibility. Therefore, only a fair and intelligent mastery of a highly professional and ethical teleological interpretation of law is a conditio sine qua non for overcoming current anomalies of social development. The juridical code of legal and illegal is a transformation of moral, legitimate and legal into YES, and immoral, illegitimate and illegal into NO. The future of education aims to generate a program for global action and a discussion on learning and knowledge for the future of humanity and the planet in a world of increasing complexity, uncertainty and insecurity.
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Loi, Francesca Rita. "WOMAN PIONEER SOCIOLOGICAL ANALYSIS OF MICRO FACTORS REGARDING THE ROLE OF MIGRATORY WOMEN FROM EASTERN EUROPE." In "Social Changes in the Global World". Универзитет „Гоце Делчев“ - Штип, 2022. http://dx.doi.org/10.46763/scgw22089l.
Full textReports on the topic "Migratory change"
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Dorr, Brian S., Kristi L. Sullivan, Paul D. Curtis, Richard B. Chipman, and Russell D. McCullough. Double-crested Cormorants. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, August 2016. http://dx.doi.org/10.32747/2016.7207735.ws.
Full textAbstract:
The history of conflict between double-crested cormorants and human interest in fisheries is long and convoluted. Overall, double-crested cormorants are not major consumers of commercial and sportfish species. However, exceptions have been recorded at specific sites with documented impacts on local fisheries. Double-crested cormorants can have a significant impact on vegetation at breeding sites through normal nesting activities. Their guano is acidic and can change soil chemistry, killing ground vegetation and irreversibly damaging nest trees. Humans should avoid direct contact with excrement from wildlife, including droppings from cormorants. The U.S. Fish and Wildlife Service (USFWS) has the primary responsibility and authority for managing migratory bird populations in the U.S. This publication will focus on the double-crested cormorant, which is the most numerous and widely dispersed of the species.