Journal articles: 'Migratory dynamics'

1

Knisley, J., T. Schmickl, and I. Karsai. "Compartmental Models of Migratory Dynamics." Mathematical Modelling of Natural Phenomena 6, no. 6 (2011): 245–59. http://dx.doi.org/10.1051/mmnp/20116613.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Richardson, George P., and John D. Sterman. "A note on migratory dynamics." System Dynamics Review 4, no. 1-2 (1988): 200–207. http://dx.doi.org/10.1002/sdr.4260040111.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Taylor, Caz M., and D. Ryan Norris. "Population dynamics in migratory networks." Theoretical Ecology 3, no. 2 (2009): 65–73. http://dx.doi.org/10.1007/s12080-009-0054-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Bourouiba, L., Jianhong Wu, S. Newman, et al. "Spatial dynamics of bar-headed geese migration in the context of H5N1." Journal of The Royal Society Interface 7, no. 52 (2010): 1627–39. http://dx.doi.org/10.1098/rsif.2010.0126.

Full text

Abstract:

Virulent outbreaks of highly pathogenic avian influenza (HPAI) since 2005 have raised the question about the roles of migratory and wild birds in the transmission of HPAI. Despite increased monitoring, the role of wild waterfowl as the primary source of the highly pathogenic H5N1 has not been clearly established. The impact of outbreaks of HPAI among species of wild birds which are already endangered can nevertheless have devastating consequences for the local and non-local ecology where migratory species are established. Understanding the entangled dynamics of migration and the disease dynamics will be key to prevention and control measures for humans, migratory birds and poultry. Here, we present a spatial dynamic model of seasonal migration derived from first principles and linking the local dynamics during migratory stopovers to the larger scale migratory routes. We discuss the effect of repeated epizootic at specific migratory stopovers for bar-headed geese ( Anser indicus ). We find that repeated deadly outbreaks of H5N1 on stopovers during the autumn migration of bar-headed geese could lead to a larger reduction in the size of the equilibrium bird population compared with that obtained after repeated outbreaks during the spring migration. However, the opposite is true during the first few years of transition to such an equilibrium. The age-maturation process of juvenile birds which are more susceptible to H5N1 reinforces this result.

APA, Harvard, Vancouver, ISO, and other styles

5

Peacock, Stephanie J., Martin Krkošek, Mark A. Lewis, and Péter K. Molnár. "A unifying framework for the transient parasite dynamics of migratory hosts." Proceedings of the National Academy of Sciences 117, no. 20 (2020): 10897–903. http://dx.doi.org/10.1073/pnas.1908777117.

Full text

Abstract:

Migrations allow animals to track seasonal changes in resources, find mates, and avoid harsh climates, but these regular, long-distance movements also have implications for parasite dynamics and animal health. Migratory animals have been dubbed “superspreaders” of infection, but migration can also reduce parasite burdens within host populations via migratory escape from contaminated habitats and transmission hotspots, migratory recovery due to parasite mortality, and migratory culling of infected individuals. Here, we show that a single migratory host–macroparasite model can give rise to these different phenomena under different parametrizations, providing a unifying framework for a mechanistic understanding of the parasite dynamics of migratory animals. Importantly, our model includes the impact of parasite burden on host movement capability during migration, which can lead to “parasite-induced migratory stalling” due to a positive feedback between increasing parasite burdens and reduced movement. Our results provide general insight into the conditions leading to different health outcomes in migratory wildlife. Our approach lays the foundation for tactical models that can help understand, predict, and mitigate future changes of disease risk in migratory wildlife that may arise from shifting migratory patterns, loss of migratory behavior, or climate effects on parasite development, mortality, and transmission.

APA, Harvard, Vancouver, ISO, and other styles

6

Peacock, Stephanie J., Juliette Bouhours, Mark A. Lewis, and Péter K. Molnár. "Macroparasite dynamics of migratory host populations." Theoretical Population Biology 120 (March 2018): 29–41. http://dx.doi.org/10.1016/j.tpb.2017.12.005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Couto, MCM, S. Quinelato, FC Cordeiro, IBM Saio, and MLA Rodrigues. "Migratory dynamics of cyathostomin larvae in a Bermuda grass pasture in South America." Veterinární Medicína 56, No. 4 (2011): 168–72. http://dx.doi.org/10.17221/3146-vetmed.

Full text

Abstract:

Studies of the migratory dynamics of cyathostomin infective larvae (L3) in different seasons and with two types of irrigation were carried out over 12 months (September 2006 to September 2007) in the subtropical climate of the Baixada Fluminense region of Rio de Janeiro state, Brazil. Four faecal masses weighing 500 g each from naturally infected horses were placed in a Bermuda grass (Cynodon dactylon) pasture in the beginning of each season. Samples of faeces and grass were collected every 15 days until the end of each season. The highest recovery in faeces occured in Autumn (491 910 L3/kg dried herbage) and in pasture was achieved in Winter (9 963 L3/kg dried herbage). The lowest number of infective larvae recovered from faeces (55 100 L3/kg dried herbage) and pastures (2 188 L3/kg dried herbage) were achieved in Spring. The nonparametric Kruskal-Wallis test showed a significant difference in infective larvae recovery between the seasons. The collection time of the samples did not affect the larva recovery. The results suggest that in the conditions of the region studied, animals maintained in pasture are at permanent risk of infection.

APA, Harvard, Vancouver, ISO, and other styles

8

Hulthén, Kaj, Ben B. Chapman, P. Anders Nilsson, et al. "Escaping peril: perceived predation risk affects migratory propensity." Biology Letters 11, no. 8 (2015): 20150466. http://dx.doi.org/10.1098/rsbl.2015.0466.

Full text

Abstract:

Although migratory plasticity is increasingly documented, the ecological drivers of plasticity are not well understood. Predation risk can influence migratory dynamics, but whether seasonal migrants can adjust their migratory behaviour according to perceived risk is unknown. We used electronic tags to record the migration of individual roach ( Rutilus rutilus ), a partially migratory fish, in the wild following exposure to manipulation of direct (predator presence/absence) and indirect (high/low roach density) perceived predation risk in experimental mesocosms. Following exposure, we released fish in their lake summer habitat and monitored individual migration to connected streams over an entire season. Individuals exposed to increased perceived direct predation risk (i.e. a live predator) showed a higher migratory propensity but no change in migratory timing, while indirect risk (i.e. roach density) affected timing but not propensity showing that elevated risk carried over to alter migratory behaviour in the wild. Our key finding demonstrates predator-driven migratory plasticity, highlighting the powerful role of predation risk for migratory decision-making and dynamics.

APA, Harvard, Vancouver, ISO, and other styles

9

Nilsson, Anna L. K., and Maria I. Sandell. "Stress hormone dynamics: an adaptation to migration?" Biology Letters 5, no. 4 (2009): 480–83. http://dx.doi.org/10.1098/rsbl.2009.0193.

Full text

Abstract:

The hormone corticosterone (CORT) is an important component of a bird’s response to environmental stress, but it can also have negative effects. Therefore, birds on migration are hypothesized to have repressed stress responses (migration-modulation hypothesis). In contrast to earlier studies on long-distance migrants, we evaluate this hypothesis in a population containing both migratory and resident individuals. We use a population of partially migratory blue tits ( Cyanistes caeruleus ) in southern Sweden as a model species. Migrants had higher CORT levels at the time of capture than residents, indicating migratory preparations, adaptation to stressors, higher allostatic load or possibly low social status. Migrants and residents had the same stress response, thus contradicting the migration-modulation hypothesis. We suggest that migrants travelling short distances are more benefited than harmed by retaining the ability to respond to stress.

APA, Harvard, Vancouver, ISO, and other styles

10

Becker, Daniel J., Ellen D. Ketterson, and Richard J. Hall. "Reactivation of latent infections with migration shapes population-level disease dynamics." Proceedings of the Royal Society B: Biological Sciences 287, no. 1935 (2020): 20201829. http://dx.doi.org/10.1098/rspb.2020.1829.

Full text

Abstract:

Annual migration is common across animal taxa and can dramatically shape the spatial and temporal patterns of infectious disease. Although migration can decrease infection prevalence in some contexts, these energetically costly long-distance movements can also have immunosuppressive effects that may interact with transmission processes in complex ways. Here, we develop a mechanistic model for the reactivation of latent infections driven by physiological changes or energetic costs associated with migration (i.e. ‘migratory relapse’) and its effects on disease dynamics. We determine conditions under which migratory relapse can amplify or reduce infection prevalence across pathogen and host traits (e.g. infectious periods, virulence, overwinter survival, timing of relapse) and transmission phenologies. We show that relapse at either the start or end of migration can dramatically increase prevalence across the annual cycle and may be crucial for maintaining pathogens with low transmissibility and short infectious periods in migratory populations. Conversely, relapse at the start of migration can reduce the prevalence of highly virulent pathogens by amplifying culling of infected hosts during costly migration, especially for highly transmissible pathogens and those transmitted during migration or the breeding season. Our study provides a mechanistic foundation for understanding the spatio-temporal patterns of relapsing infections in migratory hosts, with implications for zoonotic surveillance and understanding how infection patterns will respond to shifts in migratory propensity associated with environmental change. Further, our work suggests incorporating within-host processes into population-level models of pathogen transmission may be crucial for reconciling the range of migration–infection relationships observed across migratory species.

APA, Harvard, Vancouver, ISO, and other styles

11

Rushing, Clark S., Thomas B. Ryder, and Peter P. Marra. "Quantifying drivers of population dynamics for a migratory bird throughout the annual cycle." Proceedings of the Royal Society B: Biological Sciences 283, no. 1823 (2016): 20152846. http://dx.doi.org/10.1098/rspb.2015.2846.

Full text

Abstract:

Worldwide, migratory species are undergoing rapid declines but understanding the factors driving these declines is hindered by missing information about migratory connectivity and the lack of data to quantify environmental processes across the annual cycle. Here, we combined range-wide information about migratory connectivity with global remote-sensing data to quantify the relative importance of breeding and non-breeding environmental processes to persistent long-term population declines of a migratory songbird, the wood thrush ( Hylocichla mustelina ). Consistent with theoretical predictions about population limitation of migratory birds, our results suggest that habitat loss and climate have contributed to the observed declines in wood thrush breeding abundance, yet the relative importance of breeding versus non-breeding factors is population-specific. For example, high-abundance core breeding populations appear to be more limited by habitat loss, whereas low-abundance, peripheral populations appear to be limited by climate-driven seasonal interactions. Further, our analysis indicates that the relative impact of breeding habitat loss is at least three to six times greater than the impact of equivalent non-breeding habitat loss and therefore the steepest regional declines have likely been driven by the loss of breeding habitat. These results underscore the need for population-specific conservation strategies implemented throughout the annual cycle to reverse long-term declines.

APA, Harvard, Vancouver, ISO, and other styles

12

Kanaroglou, P., K.-L. Liaw, and Y. Y. Papageorgiou. "An Analysis of Migratory Systems: 1. Theory." Environment and Planning A: Economy and Space 18, no. 7 (1986): 913–28. http://dx.doi.org/10.1068/a180913.

Full text

Abstract:

The task of combining evolutionary migration models with stochastic utility theory is undertaken in a series of three interrelated papers. The present, first, paper deals with the evolution of migratory systems and its dynamics are drawn mainly from work by Haag and Weidlich. A migratory system is defined and then the foundations upon which the evolution of such a system is based are described, including an approximation due to Kurtz which allows the most probable state of the evolutionary model to be represented as a dynamical system. This paper closes with a discussion of disequilibrium, which is central in this series. Disequilibrium is related to the concept of a steady state, the existence of which is established for nonlinear migratory systems of the type discussed here.

APA, Harvard, Vancouver, ISO, and other styles

13

Satterfield, Dara A., John C. Maerz, and Sonia Altizer. "Loss of migratory behaviour increases infection risk for a butterfly host." Proceedings of the Royal Society B: Biological Sciences 282, no. 1801 (2015): 20141734. http://dx.doi.org/10.1098/rspb.2014.1734.

Full text

Abstract:

Long-distance animal migrations have important consequences for infectious disease dynamics. In some cases, migration lowers pathogen transmission by removing infected individuals during strenuous journeys and allowing animals to periodically escape contaminated habitats. Human activities are now causing some migratory animals to travel shorter distances or form sedentary (non-migratory) populations. We focused on North American monarch butterflies and a specialist protozoan parasite to investigate how the loss of migratory behaviours affects pathogen spread and evolution. Each autumn, monarchs migrate from breeding grounds in the eastern US and Canada to wintering sites in central Mexico. However, some monarchs have become non-migratory and breed year-round on exotic milkweed in the southern US. We used field sampling, citizen science data and experimental inoculations to quantify infection prevalence and parasite virulence among migratory and sedentary populations. Infection prevalence was markedly higher among sedentary monarchs compared with migratory monarchs, indicating that diminished migration increases infection risk. Virulence differed among parasite strains but was similar between migratory and sedentary populations, potentially owing to high gene flow or insufficient time for evolutionary divergence. More broadly, our findings suggest that human activities that alter animal migrations can influence pathogen dynamics, with implications for wildlife conservation and future disease risks.

APA, Harvard, Vancouver, ISO, and other styles

14

Bergerud, A. T. "Evolving perspectives on caribou population dynamics, have we got it right yet?" Rangifer 16, no. 4 (1996): 95. http://dx.doi.org/10.7557/2.16.4.1225.

Full text

Abstract:

The roles of food, weather and predation are compared between sedentary and migratory caribou herds. Sedentary herds disperse (space out) at calving time while the cows of migratory herds move in masse (space away) to calving grounds to reduce predation risk. The sedentary ecotype calves on ranges near open water if tree cover is present or in rugged topography in the absence of tree cover. The migratory ecotype aggregates on calving grounds located on alpine mountain plateaus or on the tundra north of the Arctic tree line. The two herds with the greatest densities in North America, the sedentary Slate Islands Herd and the migratory George River Herd both had changes in abundance that followed summer food problems. The hypothesis that winter lichen supplies determine abundance and set the carrying capacity is rejected. Lichens are not a necessary food for caribou. A review of the mortality of young calves documented in the past 30 years provides no support for the hypothesis that hypothermia is a common mortality problem. Young calves documented can be born inviable at birth if their dams are severely malnourished. The migratory caribou in North America reached peak numbers in the 1980s after wolf populations were heavily harvested in the 1970s. The sedentary ecotype is frequently regulated by wolf predation that affects both recruitment (R) and the mortality of adults (M). The balance between R/M schedules commonly occurs when R (calves) represents, about 15% of the herd and when numbers (prorated to the area of the dispersed annual range) approximate 0.06 caribou/km2. Population limitation of migratory herds by predation has occurred in the NWT and in several herds in Alaska but only when wolf densities were &gt; 6.5/1000 km2. Wolf predation halted the growth of the George River Herd in 1980 but then wolves contracted rabies and the herd again increased and degraded spring/summer ranges. The reduced summer phytomass resulted in lower birth rates and increased the vulnerability of calves and possibly adults to wolf predation. Stabilizing mechanisms for migratory herds include movements between herds above tree line and range contractions/expansions with resultant changes in demography. It is hypothesized that the most important ecological variable in all seasonal distributions of caribou is predation risk rather than to maximize forage supplies.

APA, Harvard, Vancouver, ISO, and other styles

15

SHITAGAWA, Yoshimichi, Katsuya SATO, Taiji ADACHI, and Masaki HOJO. "1255 Observation of Actin Network Dynamics in Migratory Cell." Proceedings of the JSME annual meeting 2005.6 (2005): 121–22. http://dx.doi.org/10.1299/jsmemecjo.2005.6.0_121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Ngana, Janeth James. "Modelling the Migratory Population Dynamics of the Serengeti Ecosystem." Applied and Computational Mathematics 3, no. 4 (2014): 125. http://dx.doi.org/10.11648/j.acm.20140304.13.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Reiner, Rolf, Martin Munz, and Wolfgang Weidlich. "Migratory dynamics of interacting subpopulations: Regular and chaotic behavior." System Dynamics Review 4, no. 1-2 (1988): 179–99. http://dx.doi.org/10.1002/sdr.4260040110.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Sturis, Jeppe, and Erik Mosekilde. "Bifurcation sequence in a simple model of migratory dynamics." System Dynamics Review 4, no. 1-2 (1988): 208–17. http://dx.doi.org/10.1002/sdr.4260040112.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Johnson, B. L., and D. B. Noltie. "Migratory dynamics of stream-spawning longnose gar (Lepisosteus osseus)." Ecology of Freshwater Fish 5, no. 3 (1996): 97–107. http://dx.doi.org/10.1111/j.1600-0633.1996.tb00041.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Jonzén, Niclas, Anders Hedenström, Christian Hjort, Åke Lindström, Per Lundberg, and Arne Andersson. "Climate patterns and the stochastic dynamics of migratory birds." Oikos 97, no. 3 (2002): 329–36. http://dx.doi.org/10.1034/j.1600-0706.2002.970303.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Dhanjal-Adams, Kiran L., Silke Bauer, Tamara Emmenegger, Steffen Hahn, Simeon Lisovski, and Felix Liechti. "Spatiotemporal Group Dynamics in a Long-Distance Migratory Bird." Current Biology 28, no. 17 (2018): 2824–30. http://dx.doi.org/10.1016/j.cub.2018.06.054.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Garvon, Jason M., Alan M. Fedynich, Markus J. Peterson, and Danny B. Pence. "Helminth Community Dynamics in Populations of Blue-Winged Teal (Anas discors) Using Two Distinct Migratory Corridors." Journal of Parasitology Research 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/306257.

Full text

Abstract:

The influence of spatially distinct host subpopulations on helminth community structure and pattern was examined in a migratory avian host species. Forty helminth species represented by 24,082 individuals were collected from 184 blue-winged teal (Anas discors; BWT) from 2 primary migratory corridors in Florida (eastern migratory corridor; EMC) and Louisiana and Texas (western migratory corridor; WMC). Mean species richness was greater in BWT from the WMC (x¯±S.E=10.2 ± 0.3species) than the EMC (8.6 ± 0.2). The helminth community from the WMC had higher abundances of 6 common/intermediate species. Corridor helminth communities were similar in species composition but less similar when incorporating abundances of those species. Overlapping distributions of phylogenetically related host species that share generalist helminth species across ecologically similar habitats seem to mitigate the isolating mechanisms that are necessary for the distinct coevolutionary pathways to develop between adjacent corridors.

APA, Harvard, Vancouver, ISO, and other styles

23

Magrach, Ainhoa, Carlos Lara, Ubaldo Márquez Luna, Sergio Díaz-Infante, and Ingrid Parker. "Community-level reorganizations following migratory pollinator dynamics along a latitudinal gradient." Proceedings of the Royal Society B: Biological Sciences 287, no. 1930 (2020): 20200649. http://dx.doi.org/10.1098/rspb.2020.0649.

Full text

Abstract:

Predicting how communities re-arrange in response to changes in species composition remains a key challenge in ecology. Migratory species, which enter and leave communities across latitudinal gradients, offer us a unique opportunity to evaluate community- and species-level responses to a shift in community composition. We focused on a migratory hummingbird and the communities that host it along a latitudinal and species diversity gradient. Our results show higher niche overlap in more diverse communities, allowing resident species to compensate for the loss of the migrant in providing pollination services. Contrastingly, in less diverse communities, the migrant behaves as a specialist, monopolizing abundant resources. In its absence, its role is not fully covered by resident species, resulting in a decrease in the fruit set of the migrant's preferred plant species. These results help us understand the potential impacts of biodiversity loss and have important implications for community persistence given expected changes in the migratory behaviours of some species.

APA, Harvard, Vancouver, ISO, and other styles

24

Rolland, Jonathan, Frédéric Jiguet, Knud Andreas Jønsson, Fabien L. Condamine, and Hélène Morlon. "Settling down of seasonal migrants promotes bird diversification." Proceedings of the Royal Society B: Biological Sciences 281, no. 1784 (2014): 20140473. http://dx.doi.org/10.1098/rspb.2014.0473.

Full text

Abstract:

How seasonal migration originated and impacted diversification in birds remains largely unknown. Although migratory behaviour is likely to affect bird diversification, previous studies have not detected any effect. Here, we infer ancestral migratory behaviour and the effect of seasonal migration on speciation and extinction dynamics using a complete bird tree of life. Our analyses infer that sedentary behaviour is ancestral, and that migratory behaviour evolved independently multiple times during the evolutionary history of birds. Speciation of a sedentary species into two sedentary daughter species is more frequent than speciation of a migratory species into two migratory daughter species. However, migratory species often diversify by generating a sedentary daughter species in addition to the ancestral migratory one. This leads to an overall higher migratory speciation rate. Migratory species also experience lower extinction rates. Hence, although migratory species represent a minority (18.5%) of all extant birds, they have a higher net diversification rate than sedentary species. These results suggest that the evolution of seasonal migration in birds has facilitated diversification through the divergence of migratory subpopulations that become sedentary, and illustrate asymmetrical diversification as a mechanism by which diversification rates are decoupled from species richness.

APA, Harvard, Vancouver, ISO, and other styles

25

Dunn, Daniel C., Autumn-Lynn Harrison, Corrie Curtice, et al. "The importance of migratory connectivity for global ocean policy." Proceedings of the Royal Society B: Biological Sciences 286, no. 1911 (2019): 20191472. http://dx.doi.org/10.1098/rspb.2019.1472.

Full text

Abstract:

The distributions of migratory species in the ocean span local, national and international jurisdictions. Across these ecologically interconnected regions, migratory marine species interact with anthropogenic stressors throughout their lives. Migratory connectivity, the geographical linking of individuals and populations throughout their migratory cycles, influences how spatial and temporal dynamics of stressors affect migratory animals and scale up to influence population abundance, distribution and species persistence. Population declines of many migratory marine species have led to calls for connectivity knowledge, especially insights from animal tracking studies, to be more systematically and synthetically incorporated into decision-making. Inclusion of migratory connectivity in the design of conservation and management measures is critical to ensure they are appropriate for the level of risk associated with various degrees of connectivity. Three mechanisms exist to incorporate migratory connectivity into international marine policy which guides conservation implementation: site-selection criteria, network design criteria and policy recommendations. Here, we review the concept of migratory connectivity and its use in international policy, and describe the Migratory Connectivity in the Ocean system, a migratory connectivity evidence-base for the ocean. We propose that without such collaboration focused on migratory connectivity, efforts to effectively conserve these critical species across jurisdictions will have limited effect.

APA, Harvard, Vancouver, ISO, and other styles

26

Taylor, Caz M., and Richard J. Hall. "Metapopulation models for seasonally migratory animals." Biology Letters 8, no. 3 (2011): 477–80. http://dx.doi.org/10.1098/rsbl.2011.0916.

Full text

Abstract:

Metapopulation models are widely used to study species that occupy patchily distributed habitat, but are rarely applied to migratory species, because of the difficulty of identifying demographically independent subpopulations. Here, we extend metapopulation theory to describe the directed seasonal movement of migratory populations between two sets of habitat patches, breeding and non-breeding, with potentially different colonization and extinction rates between patch types. By extending the classic metapopulation model, we show that migratory metapopulations will persist if the product of the two colonization rates exceeds the product of extinction rates. Further, we develop a spatially realistic migratory metapopulation model and derive a landscape metric—the migratory metapopulation capacity—that determines persistence. This new extension to metapopulation theory introduces an important tool for the management and conservation of migratory species and may also be applicable to model the dynamics of two host–parasite systems.

APA, Harvard, Vancouver, ISO, and other styles

27

Mariani, Richard A., Shalaka Paranjpe, Radek Dobrowolski, and Gregory F. Weber. "14-3-3 targets keratin intermediate filaments to mechanically sensitive cell–cell contacts." Molecular Biology of the Cell 31, no. 9 (2020): 930–43. http://dx.doi.org/10.1091/mbc.e18-06-0373.

Full text

Abstract:

14-3-3 serves as a major regulator of keratin intermediate filament dynamics in vivo. Migratory mesendoderm tissue of the Xenopus embryo is used to show that the dynamic reorganization of keratin filaments, a consequence of force on cell-cell adhesions, is mediated by a novel association between 14-3-3 and Keratin 19.

APA, Harvard, Vancouver, ISO, and other styles

28

Visvizi, Anna, Colette Mazzucelli, and Miltiadis Lytras. "Irregular migratory flows." Journal of Science and Technology Policy Management 8, no. 2 (2017): 227–42. http://dx.doi.org/10.1108/jstpm-05-2017-0020.

Full text

Abstract:

Purpose The purpose of this study is to navigate the challenges irregular migratory flows generate for cities and urban systems. The migration and refugee crises that challenged Europe in 2015-2016 revealed that the developed world cities and urban areas are largely unprepared to address challenges that irregular migratory flows generate. This paper queries the smart and resilient cities’ debates, respectively, to highlight that migration-related challenges and opportunities have not been explicitly addressed in those deliberations. This creates a disconnect between what these debates promise and what cities/urban systems increasingly need to address on a daily basis. Subsequently, a way of bridging that disconnect is proposed and its policy-making implications discussed. Design/methodology/approach To suggest ways of navigating irregular migration-inflicted challenges cities/urban areas face, a nexus between the smart cities and resilient cities’ debates is established. By placing advanced sophisticated information and communication technologies (ICTs) at the heart of the analysis, a novel dynamic ICTs’ enabled integrated framework for resilient urban systems is developed. The framework’s dynamics is defined by two hierarchically interconnected levers, i.e. that of ICTs and that of policy-design and policy-making. Drawing from qualitative analysis and process tracing, the cross-section of policy design and policy-making geared towards the most efficient and ethically sensitive use of sophisticated ICTs is queried. Subsequently, options available to cities/urban systems are discussed. Findings The ICTs’ enabled integrated framework for resilient urban systems integrates the effectiveness of migrants and refugees’ policy design and policy-making in human-centred thinking, planning and policy-design for resilient urban systems. It places resilient approaches in the spotlight of research and policy-making, naming them the most effective methods for promoting a humanistic smart cities and resilient urban systems vision. It highlights critical junctions that urban systems’ stakeholders must consider if the promise of emerging sophisticated ICTs is to be employed effectively for the entire society, including its most vulnerable members. Research limitations/implications First, when designing ICTs’ enabled integrated resilient urban systems, the key stakeholders involved in the policy-design and policy-making process, including local, national and regional authorities, must employ a holistic view to the urban systems seen through the lens of hard and soft concerns as well as considerations expressed by the receiving and incoming populations. Second, the third-sector representatives, including non-governmental organizations (NGOs) and other actors, need to be seen as peers in integrated humanistic networks, thereby contributing critical, unbiased knowledge flows to infrastructures, which promote fair and inclusive participation of migrants and refugees in local economies. Practical implications The ICTs’ enabled integrated framework for resilient urban systems promotes a humanistic smart cities’ and resilient urban systems’ vision. It suggests how to design and implement policies apt to meet the needs of both receiving and incoming populations along value chains specific to smart and resilient cities. It promotes emerging sophisticated ICTs as the subtle, yet key, enabler of data ecosystems and customized services capable of responding to critical societal needs of the receiving and the incoming populations. In addition, the framework suggests options, alternatives and strategies for urban systems’ stakeholders, including the authorities, businesses, NGOs, inhabitants and ICTs’ providers and vendors. Originality/value The value added of this paper is three-fold. At the conceptual level, by bringing together the smart cities and resilient cities debates, and incorporating sophisticated ICTs in the analysis, it makes a case for their usefulness for cities/urban areas in light of challenges these cities/urban areas confront each day. At the empirical level, this analysis maps the key challenges that cities and their stakeholders face in context of migratory flows and highlights their dual nature. At the policy-making level, this study makes a case for a sound set of policies and actions that boost effective use of ICTs beyond the smart technology hype.

APA, Harvard, Vancouver, ISO, and other styles

29

Briedis, Martins, and Silke Bauer. "Migratory connectivity in the context of differential migration." Biology Letters 14, no. 12 (2018): 20180679. http://dx.doi.org/10.1098/rsbl.2018.0679.

Full text

Abstract:

Understanding how breeding populations are spatially and temporarily associated with one another over the annual cycle has important implications for population dynamics. Migratory connectivity typically assumes that populations mix randomly; yet, in many species and populations, sex-, age- or other subgroups migrate separately, and/or spend the non-breeding period separated from each other—a phenomenon coined differential migration. These subgroups likely experience varying environmental conditions, which may carry-over to affect body condition, reproductive success and survival. We argue that environmental or habitat changes can have disproportional effects on a population's demographic rates under differential migration compared to random mixing. Depending on the relative contribution of each of these subgroups to population growth, environmental perturbations may be buffered (under-proportional) or amplified (over-proportional). Thus, differential migration may result in differential mortality and carry-over effects that can have concomitant consequences for dynamics and resilience of the populations. Recognizing the role of differential migration in migratory connectivity and its consequences on population dynamics can assist in developing conservation actions that are tailored to the most influential demographic group(s) and the times and places where they are at peril.

APA, Harvard, Vancouver, ISO, and other styles

30

Kanaroglou, P., K.-L. Liaw, and Y. Y. Papageorgiou. "An Analysis of Migratory Systems: 2. Operational Framework." Environment and Planning A: Economy and Space 18, no. 8 (1986): 1039–60. http://dx.doi.org/10.1068/a181039.

Full text

Abstract:

This is the second in a series of three interrelated papers which aim to combine evolutionary migration models with stochastic utility theory. The first paper dealt with migratory dynamics. Here the details are given of a choice model, established by McFadden, which can be used in conjunction with migratory dynamics thus providing an explicit link between the macroproperties of the population system and human behaviour. First, the structure of transition probabilities is derived under a two-level decision to migrate. An argument is then given about the empirical form of these probabilities, and the discussion closes with a method which can be used for their maximum likelihood estimation.

APA, Harvard, Vancouver, ISO, and other styles

31

Franco Aguilar, José. "Mujeres mexicanas retornadas: reconfiguraciones en la dinámica familiar / Mexican women migrants returning. Reconfigurations in the family dynamics." Revista Trace, no. 80 (July 30, 2021): 234. http://dx.doi.org/10.22134/trace.80.2021.754.

Full text

Abstract:

El presente artículo analiza los cambios o continuidades generados por mujeres mexicanas retornadas dentro de su dinámica intrafamiliar, derivados de su experiencia migratoria en EE. UU. El objetivo será la construcción de una tipología que discrimine la existencia de transformaciones dentro de dicha dinámica. En concreto, se exploran cuestiones intrínsecas en las familias que dan la pauta para contrastar situaciones. Particularmente, se estudian las siguientes dimensiones de análisis: trabajo doméstico, cuidado de los hijos, pautas de interacción familiar y concepción propia de la posición dentro del grupo doméstico. Los sujetos de análisis son veinte mujeres retornadas que tuvieron una residencia en EE. UU., quienes radican en una localidad rural, en el estado de Jalisco en México.Abstract: This article analyzes the changes and continuities in gender roles and family dynamics among migrant women returning from the United States. It considers the migratory experience as a potentially important factor influencing changes in gender dynamics within the family. The objective is to construct a typology that discriminates between existing changes in family dynamics and changes in gender roles resulting from the migratory experience. In order to provide a context to contrast situations, the article explores gender dynamics apparent in certain family dynamics, including housework, childcare, patterns of family interaction, and returning migrants’ conception of their position within the domestic group. The subjects of analysis are twenty returning migrant women from the United States who currently reside in a rural village in Jalisco, Mexico. Keywords: return migration; female return migration; family dynamics; rural area; Mexico. Résumé : Cet article analyse les changements et les continuités générés par les femmes mexicaines de retour de migration dans leur dynamique intra-familiale, comme résultats de leur expérience migratoire aux États-Unis. L’article propose de construire une typologie qui observe l’existence de transformations dans ces dynamiques. Plus précisément, les problèmes intrinsèques sont explorés au sein des familles et définissent la norme dans des situations contrastées. En particulier, sont analysées les dimensions suivantes : travail domestique, garde des enfants, modèles d’interaction familial et conception du rôle féminin dans le groupe domestique. Les sujets analysés sont vingt femmes de retour de migration qui ont résidé aux États-Unis et qui vivent actuellement dans une ville rurale de l’État de Jalisco au Mexique.Mots-clés : migration de retour ; femmes rapatriées ; dynamique intra-familiale ; zones rurales ; Mexique.

APA, Harvard, Vancouver, ISO, and other styles

32

Brown, Leone M., and Richard J. Hall. "Consequences of resource supplementation for disease risk in a partially migratory population." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1745 (2018): 20170095. http://dx.doi.org/10.1098/rstb.2017.0095.

Full text

Abstract:

Anthropogenic landscape features such as urban parks and gardens, landfills and farmlands can provide novel, seasonally reliable food sources that impact wildlife ecology and distributions. In historically migratory species, food subsidies can cause individuals to forgo migration and form partially migratory or entirely sedentary populations, eroding a crucial benefit of migration: pathogen avoidance through seasonal abandonment of transmission sites and mortality of infected individuals during migration. Since many migratory taxa are declining, and wildlife populations in urban areas can harbour zoonotic pathogens, understanding the mechanisms by which anthropogenic resource subsidies influence infection dynamics and the persistence of migration is important for wildlife conservation and public health. We developed a mathematical model for a partially migratory population and a vector-borne pathogen transmitted at a shared breeding ground, where food subsidies increase the nonbreeding survival of residents. We found that higher resident nonbreeding survival increased infection prevalence in residents and migrants, and lowered the fraction of the population that migrated. The persistence of migration may be especially threatened if residency permits emergence of more virulent pathogens, if resource subsidies reduce costs of infection for residents, and if infection reduces individual migratory propensity. This article is part of the theme issue ‘Anthropogenic resource subsidies and host–parasite dynamics in wildlife’.

APA, Harvard, Vancouver, ISO, and other styles

33

RYAN NORRIS, D., and PETER P. MARRA. "SEASONAL INTERACTIONS, HABITAT QUALITY, AND POPULATION DYNAMICS IN MIGRATORY BIRDS." Condor 109, no. 3 (2007): 535. http://dx.doi.org/10.1650/8350.1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Ryan Norris, D., and Peter P. Marra. "Seasonal Interactions, Habitat Quality, and Population Dynamics in Migratory Birds." Condor 109, no. 3 (2007): 535–47. http://dx.doi.org/10.1093/condor/109.3.535.

Full text

Abstract:

AbstractAbstract. Historically, studies of habitat selection have focused on quantifying how current patterns of habitat occupancy influence condition and survival within a season. This approach, however, is overly simplistic, especially for migratory birds that spend different periods of the year in geographically distinct places. Habitat occupancy and the resulting condition of individual birds is likely to be affected by events in the previous season, and the consequences of habitat occupancy will influence individuals and populations in subsequent seasons. Thus, for migratory birds, variation in habitat quality (and quantity) needs to be understood in the context of how events interact throughout periods of the annual cycle. Seasonal interactions can occur at the individual level or population level. Individual-level interactions occur when events in one season produce nonlethal, residual effects that carry over to influence individuals the following season. Population-level interactions occur when a change in population size in one season influences per capita rates the following season. We review various methods for estimating seasonal interactions and highlight a number of examples in the literature. Using a variety of techniques, including intrinsic and extrinsic markers, the vast majority of studies to date have measured seasonal interactions at the individual level. Obtaining estimates of density and changes in per capita rates across multiple seasons to determine population-level interactions has been more challenging. Both types of seasonal interactions can influence population dynamics, but predicting their effects requires detailed knowledge of how populations are geographically connected (i.e., migratory connectivity). We recommend that researchers studying habitat occupancy and habitat selection consider how events in previous seasons influence events within a season.

APA, Harvard, Vancouver, ISO, and other styles

35

Smith, W. E., and T. J. Kwak. "Otolith microchemistry of tropical diadromous fishes: spatial and migratory dynamics." Journal of Fish Biology 84, no. 4 (2014): 913–28. http://dx.doi.org/10.1111/jfb.12317.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Li, Yiwen, Amanda A. Pierce, and Jacobus C. de Roode. "Variation in Forewing Size Linked to Migratory Status in Monarch Butterflies." Animal Migration 3, no. 1 (2016): 27–34. http://dx.doi.org/10.1515/ami-2016-0003.

Full text

Abstract:

AbstractLong-distance migration can be seen throughout the animal kingdom and can have large impacts on population dynamics and species distributions. The act of migration itself also affects the evolution of a species, as evolutionary forces select for certain characteristics in animals conducting long-distance migration. Monarch butterflies are best known for their annual migration from Canada and the northern United States to central Mexico, but some populations of monarchs have lost the ability to migrate. Previous research found that migratory monarchs had larger, more elongated wings than their non-migratory counterparts and it was hypothesized that these traits were beneficial for migration. However, Bergmann’s rule - which predicts larger body sizes with increasing latitude - could also explain this pattern as migratory populations are found at higher latitudes. To understand the role of wing dimensions in migration, we examined forewing size and shape of migratory and non-migratory monarchs from seven worldwide populations varying in latitude. Results showed that larger forewing size was indeed correlated with migratory status rather than latitude. However, migratory monarchs did not have more elongated forewing shape than non-migratory monarchs across the globe. Our study indicates that size may play a larger role than shape in long-distance migratory capability.

APA, Harvard, Vancouver, ISO, and other styles

37

Wallace, B. M., and Danny B. Pence. "Population dynamics of the helminth community from migrating blue-winged teal: loss of helminths without replacement on the wintering grounds." Canadian Journal of Zoology 64, no. 8 (1986): 1765–73. http://dx.doi.org/10.1139/z86-266.

Full text

Abstract:

The main and interactive effects of host and seasonal factors on abundance of 22 common helminth species from fall and spring migratory blue-winged teal collected in the Texas Panhandle were examined. Although abundances of many common helminth species were greater in immature than adult birds just off the breeding grounds, fall-collected adults had higher abundances of most helminth species than did both juvenile and adult birds from the wintering grounds in Mexico. While total abundance of helminths declined on the wintering grounds to only 54% of that from fall-collected birds, overall species composition and abundances of some helminth species were equivalent in the host population throughout the year, regardless of changing geographic locality and migratory stress. The helminth fauna acquired in the northern latitude breeding grounds was not replaced by an ecologically equivalent fauna in the southern latitude wintering grounds. Only one species, Corynosoma constrictum, was lost without replacement during the wintering period. Schistorphus cucullatus, a parasite of the Raillidae, occurred in birds on the wintering grounds but was lost without replacement on the breeding grounds. Thus, most of these helminth species were capable of ubiquitous transmission across the range of this host and (or) infections of the respective species persisted through the migratory stress period. This study suggests that diversity in the helminth community of a migratory host species over its entire geographic range may largely result from differences between separate populations that have become isolated over time as a result of establishing specific migratory corridors, rather than from the short-term effects of environmental differences between regions representing the extremes of the overall migratory range (breeding and wintering grounds).

APA, Harvard, Vancouver, ISO, and other styles

38

Freshwater, Cameron, Brian J. Burke, Mark D. Scheuerell, Sue C. H. Grant, Marc Trudel, and Francis Juanes. "Coherent population dynamics associated with sockeye salmon juvenile life history strategies." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 8 (2018): 1346–56. http://dx.doi.org/10.1139/cjfas-2017-0251.

Full text

Abstract:

Although the importance of diversity to maintaining metapopulation stability is widely recognized, the ecological characteristics that lead to synchronous dynamics within population aggregates are often unclear. We used a constrained dynamic factor analysis to explore patterns of covariance in productivity among 16 Fraser River sockeye salmon (Oncorhynchus nerka) conservation units (CUs). Specifically, we tested whether coherent trends in productivity covaried with five distinct ecological attributes: physical characteristics of nursery lakes, large-scale management interventions, genetic similarity, adult migration phenology, or juvenile migratory traits. The top-ranked model had two trends based on nursery lake characteristics and juvenile migratory traits. One trend represented the dynamics of CUs that rear in nursery lakes prior to ocean entry and undergo relatively rapid marine migrations. The second included a sea-type CU, Harrison River, which enters the marine environment without rearing in a nursery lake and migrates more slowly. The uniform response of lake-type CUs, as well as Harrison River CU’s unique life history, suggests that coherent trends are structured by traits that covary with broad life history type, rather than fine-scale characteristics. Furthermore, we document substantial temporal variability in the strength of synchronous dynamics among Fraser River CUs. Greater synchrony in recent years suggests that the importance of shared regional drivers, relative to local processes, may have increased.

APA, Harvard, Vancouver, ISO, and other styles

39

Schultner, Jannik, Børge Moe, Olivier Chastel, Claus Bech, and Alexander S. Kitaysky. "Migration and stress during reproduction govern telomere dynamics in a seabird." Biology Letters 10, no. 1 (2014): 20130889. http://dx.doi.org/10.1098/rsbl.2013.0889.

Full text

Abstract:

Changes in telomere length are believed to reflect changes in physiological state and life expectancy in animals. However, much remains unknown about the determinants of telomere dynamics in wild populations, and specifically the influence of conditions during highly mobile life-history stages, for example migration. We tested whether telomere dynamics were associated with migratory behaviour and/or with stress during reproduction in free-living seabirds. We induced short-term stress during reproduction in chick-rearing, black-legged kittiwakes ( Rissa tridactyla ), tracked winter migration with geolocators and measured telomere length before and after winter migration. We found that time spent at wintering grounds correlated with reduced telomere loss, while stress during reproduction accelerated telomere shortening. Our results suggest that different life-history stages interact to influence telomere length, and that migratory patterns may be important determinants of variation in an individual's telomere dynamics.

APA, Harvard, Vancouver, ISO, and other styles

40

Wong, Siu Ying, Anders Frederiksen, Maja Hanić, et al. "Navigation of migratory songbirds: a quantum magnetic compass sensor." Neuroforum 27, no. 3 (2021): 141–50. http://dx.doi.org/10.1515/nf-2021-0005.

Full text

Abstract:

Abstract The remarkable ability of migratory birds to navigate accurately using the geomagnetic field for journeys of thousands of kilometres is currently thought to arise from radical pair reactions inside a protein called cryptochrome. In this article, we explain the quantum mechanical basis of the radical pair mechanism and why it is currently the dominant theory of compass magnetoreception. We also provide a brief account of two important computational simulation techniques that are used to study the mechanism in cryptochrome: spin dynamics and molecular dynamics. At the end, we provide an overview of current research on quantum mechanical processes in avian cryptochromes and the computational models for describing them.

APA, Harvard, Vancouver, ISO, and other styles

41

Sudarsono, Hamim. "HAMA BELALANG KEMBARA (LOCUSTA MIGRATORIA MANILENSIS MEYEN): FAKTA DAN ANALISIS AWAL LEDAKAN POPULASI DI PROVINSI LAMPUNG." Jurnal Hama dan Penyakit Tumbuhan Tropika 3, no. 2 (2003): 51–56. http://dx.doi.org/10.23960/j.hptt.2351-56.

Full text

Abstract:

Migratory locust (Locusta migratoria manilensis Meyen) : Preliminary facts and analyzes on the population outbreaks in Lampung Province. The migratory locust (locally known as belalang kembara), Locusta migratoria manilensis Meyen (Orthoptera: Acrididae), has become a major insect pest in Lampung in recent years since its outbreak in 1998. Thousand hectares of agricultural fields were severely destroyed by the locust populations during the course of the outbreak. Local as well as national government were caught in surprised by the population upsurge with little information and technology available for controlling the pest. First presence of locust population was recorded in Kecamatan Pakuan Ratu in 1990. Area damage in the first year was ca. 60 ha. The population grew steadily over the years and reached its peak in April-May of 1998 when thousands of corn and rice fields were severely damaged. Country roads and fields were filled with millions of locust nymphs. Records of locust attacks during preliminary outbreaks from 1990 to 1998 also indicated that the insect started its outbreak from the same areas during those years, i.e. North Lampung District and northern Tulang Bawang District (two of the outmost northern of Lampung Province). Insect pest control experts were very concerned that the locust has established its populations in the region and could cause significant loss in the upcoming years. Control strategy and techniques based on the insect biology and population dynamics, therefore, should be explored and developed to manage future outbreaks. This paper discusses and analyzes preliminary facts and information on the migratory locust and possible strategies that could be implemented for managing the locust.

APA, Harvard, Vancouver, ISO, and other styles

42

Anjos, Carolina C., Carolina R. F. Chagas, Alan Fecchio, et al. "Avian Malaria and Related Parasites from Resident and Migratory Birds in the Brazilian Atlantic Forest, with Description of a New Haemoproteus Species." Pathogens 10, no. 2 (2021): 103. http://dx.doi.org/10.3390/pathogens10020103.

Full text

Abstract:

Determining the prevalence and local transmission dynamics of parasitic organisms are necessary to understand the ability of parasites to persist in host populations and disperse across regions, yet local transmission dynamics, diversity, and distribution of haemosporidian parasites remain poorly understood. We studied the prevalence, diversity, and distributions of avian haemosporidian parasites of the genera Plasmodium, Haemoproteus, and Leucocytozoon among resident and migratory birds in Serra do Mar, Brazil. Using 399 blood samples from 66 Atlantic Forest bird species, we determined the prevalence and molecular diversity of these pathogens across avian host species and described a new species of Haemoproteus. Our molecular and morphological study also revealed that migratory species were infected more than residents. However, vector infective stages (gametocytes) of Leucocytozoon spp., the most prevalent parasites found in the most abundant migrating host species in Serra do Mar (Elaenia albiceps), were not seen in blood films of local birds suggesting that this long-distance Austral migrant can disperse Leucocytozoon parasite lineages from Patagonia to the Atlantic Forest, but lineage sharing among resident species and local transmission cannot occur in this part of Brazil. Our study demonstrates that migratory species may harbor a higher diversity and prevalence of parasites than resident species, but transportation of some parasites by migratory hosts may not always affect local transmission.

APA, Harvard, Vancouver, ISO, and other styles

43

Lei, Jialin, Yifei Jia, Aojie Zuo, et al. "Bird Satellite Tracking Revealed Critical Protection Gaps in East Asian–Australasian Flyway." International Journal of Environmental Research and Public Health 16, no. 7 (2019): 1147. http://dx.doi.org/10.3390/ijerph16071147.

Full text

Abstract:

Most migratory birds depend on stopover sites, which are essential for refueling during migration and affect their population dynamics. In the East Asian–Australasian Flyway (EAAF), however, the stopover ecology of migratory waterfowl is severely under-studied. The knowledge gaps regarding the timing, intensity and duration of stopover site usages prevent the development of effective and full annual cycle conservation strategies for migratory waterfowl in EAAF. In this study, we obtained a total of 33,493 relocations and visualized 33 completed spring migratory paths of five geese species using satellite tracking devices. We delineated 2,192,823 ha as the key stopover sites along the migration routes and found that croplands were the largest land use type within the stopover sites, followed by wetlands and natural grasslands (62.94%, 17.86% and 15.48% respectively). We further identified the conservation gaps by overlapping the stopover sites with the World Database on Protected Areas (PA). The results showed that only 15.63% (or 342,757 ha) of the stopover sites are covered by the current PA network. Our findings fulfil some key knowledge gaps for the conservation of the migratory waterbirds along the EAAF, thus enabling an integrative conservation strategy for migratory water birds in the flyway.

APA, Harvard, Vancouver, ISO, and other styles

44

Le Bris, Arnault, Alain Fréchet, Peter S. Galbraith, and Joseph S. Wroblewski. "Evidence for alternative migratory behaviours in the northern Gulf of St Lawrence population of Atlantic cod (Gadus morhua L.)." ICES Journal of Marine Science 70, no. 4 (2013): 793–804. http://dx.doi.org/10.1093/icesjms/fst068.

Full text

Abstract:

Abstract Le Bris, A., Fréchet, A., Galbraith, P. S., and Wroblewski, J. S. 2013. Evidence for alternative migratory behaviours in the northern Gulf of St Lawrence population of Atlantic cod (Gadus morhua L.). – ICES Journal of Marine Science, 70: 793–804. Inter-individual variation in migration propensity affects population dynamics and connectivity. The diversity of migratory behaviours of Atlantic cod (fork length >40 cm) in the northern Gulf of St Lawrence was studied using data-storage tags that record depth and temperature. Movement patterns of Atlantic cod equipped with data-storage tags were reconstructed using a geolocation model based on daily maximum depth and bottom temperature. Reconstructed migration routes revealed the previously undocumented coexistence of resident and migratory individuals in the population. Migratory cod overwintered in relatively deep (300–500 m) and warm (5°C) waters, while residents displayed a prolonged period of immobility in shallow (<100 m) and near-freezing (–1.5°C) coastal waters of western Newfoundland. In the spring, migratory cod displayed extensive diel vertical migration suggestive of spawning behaviour. The presence of alternative migratory behaviours should be considered in the spatiotemporal management of the collapsed population.

APA, Harvard, Vancouver, ISO, and other styles

45

Silva, Fernanda de Oliveira, Francisco Ricardo de Andrade Neto, Samara Hermes Silva, et al. "Recruitment dynamics of a migratory fish in a semiarid river system." Inland Waters 10, no. 4 (2020): 529–41. http://dx.doi.org/10.1080/20442041.2020.1805977.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Alvarado, Allison H., Trevon L. Fuller, and Thomas B. Smith. "Integrative tracking methods elucidate the evolutionary dynamics of a migratory divide." Ecology and Evolution 4, no. 17 (2014): 3456–69. http://dx.doi.org/10.1002/ece3.1205.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Sarà, Maurizio, Daniela Campobello, Laura Zanca, and Bruno Massa. "Food for flight: pre-migratory dynamics of the Lesser KestrelFalco naumanni." Bird Study 61, no. 1 (2014): 29–41. http://dx.doi.org/10.1080/00063657.2013.867476.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Bernard, Andrea M., Kevin A. Feldheim, Michael R. Heithaus, Sabine P. Wintner, Bradley M. Wetherbee, and Mahmood S. Shivji. "Global population genetic dynamics of a highly migratory, apex predator shark." Molecular Ecology 25, no. 21 (2016): 5312–29. http://dx.doi.org/10.1111/mec.13845.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Lee, Rachel M., Leonard Campanello, Matt J. Hourwitz, et al. "Quantifying topography-guided actin dynamics across scales using optical flow." Molecular Biology of the Cell 31, no. 16 (2020): 1753–64. http://dx.doi.org/10.1091/mbc.e19-11-0614.

Full text

Abstract:

Two cell types with different migratory behaviors both exhibit guided actin polymerization along nanoscale ridge textures. Optical flow, a tool used in autonomous vehicles and facial recognition, is adapted for fluorescence imaging. The power of optical flow as a tool for future studies of intracellular dynamics is demonstrated.

APA, Harvard, Vancouver, ISO, and other styles

50

Rivera, J., E. Barba, A. Mestre, et al. "Effects of migratory status and habitat on the prevalence and intensity of infection by haemoparasites in passerines in eastern Spain." Animal Biodiversity and Conservation 36, no. 1 (2013): 113–21. http://dx.doi.org/10.32800/abc.2013.36.0113.

Full text

Abstract:

The Iberian peninsula is a suitable place to study the effects of migratory condition on the prevalence of blood parasites in avian communities as resident, local populations cohabit with migratory species and with abundant vector populations. In this study we examined the incidence of avian blood parasites in three localities in the Mediterranean region (east Spain), in relation to the migratory status of the species. We analyzed 333 blood smears from 11 avian species, and obtained an overall prevalence of 9.6 %. The prevalence of parasites varied among the different species studied, although intensity of infection did not. Our results are discussed in terms of population dynamics and abundance of Diptera vectors able to transmit blood parasites to other birds.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Migratory dynamics'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles