Academic literature on the topic 'Migratory connectivity'
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Journal articles on the topic "Migratory connectivity"
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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.
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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.
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Norris, D. Ryan, Michael B. Wunder, and Marylène Boulet. "Perspectives on Migratory Connectivity." Ornithological Monographs, no. 61 (January 2006): 79–88. http://dx.doi.org/10.2307/40166838.
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Gao, Boya, Johanna Hedlund, Don R. Reynolds, Baoping Zhai, Gao Hu, and Jason W. Chapman. "The 'migratory connectivity' concept, and its applicability to insect migrants." Movement Ecology 8, no. 1 (2020): 48. https://doi.org/10.5281/zenodo.14815906.
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(Uploaded by Plazi for the Bat Literature Project) Migratory connectivity describes the degree of linkage between different parts of an animal's migratory range due to the movement trajectories of individuals. High connectivity occurs when individuals from one particular part of the migratory range move almost exclusively to another localized part of the migratory range with little mixing with individuals from other regions. Conversely, low migratory connectivity describes the situation where individuals spread over a wide area during migration and experience a large degree of mixing with individuals from elsewhere. The migratory connectivity concept is frequently applied to vertebrate migrants (especially birds), and it is highly relevant to conservation and management of populations. However, it is rarely employed in the insect migration literature, largely because much less is known about the migration circuits of most migratory insects than is known about birds. In this review, we discuss the applicability of the migratory connectivity concept to longrange insect migrations. In contrast to birds, insect migration circuits typically comprise multigenerational movements of geographically unstructured (non-discrete) populations between broad latitudinal zones. Also, compared to the faster-flying birds, the lower degree of control over movement directions would also tend to reduce connectivity in many insect migrants. Nonetheless, after taking account of these differences, we argue that the migratory connectivity framework can still be applied to insects, and we go on to consider postulated levels of connectivity in some of the most intensively studied insect migrants. We conclude that a greater understanding of insect migratory connectivity would be of value for conserving threatened species and managing pests.
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Kramer, Gunnar R., David E. Andersen, David A. Buehler, et al. "Population trends inVermivorawarblers are linked to strong migratory connectivity." Proceedings of the National Academy of Sciences 115, no. 14 (2018): E3192—E3200. http://dx.doi.org/10.1073/pnas.1718985115.
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Migratory species can experience limiting factors at different locations and during different periods of their annual cycle. In migratory birds, these factors may even occur in different hemispheres. Therefore, identifying the distribution of populations throughout their annual cycle (i.e., migratory connectivity) can reveal the complex ecological and evolutionary relationships that link species and ecosystems across the globe and illuminate where and how limiting factors influence population trends. A growing body of literature continues to identify species that exhibit weak connectivity wherein individuals from distinct breeding areas co-occur during the nonbreeding period. A detailed account of a broadly distributed species exhibiting strong migratory connectivity in which nonbreeding isolation of populations is associated with differential population trends remains undescribed. Here, we present a range-wide assessment of the nonbreeding distribution and migratory connectivity of two broadly dispersed Nearctic-Neotropical migratory songbirds. We used geolocators to track the movements of 70Vermivorawarblers from sites spanning their breeding distribution in eastern North America and identified links between breeding populations and nonbreeding areas. Unlike blue-winged warblers (Vermivora cyanoptera), breeding populations of golden-winged warblers (Vermivora chrysoptera) exhibited strong migratory connectivity, which was associated with historical trends in breeding populations: stable for populations that winter in Central America and declining for those that winter in northern South America.
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Trierweiler, Christiane, Raymond H. G. Klaassen, Rudi H. Drent, et al. "Migratory connectivity and population-specific migration routes in a long-distance migratory bird." Proceedings of the Royal Society B: Biological Sciences 281, no. 1778 (2014): 20132897. http://dx.doi.org/10.1098/rspb.2013.2897.
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Knowledge about migratory connectivity, the degree to which individuals from the same breeding site migrate to the same wintering site, is essential to understand processes affecting populations of migrants throughout the annual cycle. Here, we study the migration system of a long-distance migratory bird, the Montagu's harrier Circus pygargus , by tracking individuals from different breeding populations throughout northern Europe. We identified three main migration routes towards wintering areas in sub-Saharan Africa. Wintering areas and migration routes of different breeding populations overlapped, a pattern best described by ‘weak (diffuse) connectivity’. Migratory performance, i.e. timing, duration, distance and speed of migration, was surprisingly similar for the three routes despite differences in habitat characteristics. This study provides, to our knowledge, a first comprehensive overview of the migration system of a Palaearctic-African long-distance migrant. We emphasize the importance of spatial scale (e.g. distances between breeding populations) in defining patterns of connectivity and suggest that knowledge about fundamental aspects determining distribution patterns, such as the among-individual variation in mean migration directions, is required to ultimately understand migratory connectivity. Furthermore, we stress that for conservation purposes it is pivotal to consider wintering areas as well as migration routes and in particular stopover sites.
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Bauer, Silke, Simeon Lisovski, and Steffen Hahn. "Timing is crucial for consequences of migratory connectivity." Oikos 125, no. 5 (2016): 605–12. https://doi.org/10.5281/zenodo.3935254.
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<strong>Abstract</strong> Migratory connectivity can have important consequences for individuals, populations and communities. We argue that most consequences not only depend on <em>which</em> sites are used but importantly also on <em>when</em> these are used and suggest that the timing of migration is characterised by synchrony, phenology, and consistency. We illustrate the importance of these aspects of timing for shaping the consequences of migratory connectivity on individual fitness, population dynamics, gene flow and community dynamics using examples from throughout the animal kingdom. Exemplarily for one specific process that is shaped by migratory connectivity and the timing of migration – the transmission of parasites and the dynamics of diseases – we underpin our arguments with a dynamic epidemiological network model of a migratory population. Here, we quantitatively demonstrate that variations in migration phenology and synchrony yield disease dynamics that significantly differ from a time‐neglecting case. Extending the original definition of migratory connectivity into a spatio‐temporal concept can importantly contribute to understanding the links migratory animals make across the globe and the consequences these may have both for the dynamics of their populations and the communities they visit throughout their journeys.
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Cohen, Emily B., Jeffrey A. Hostetler, Michael T. Hallworth, Clark S. Rushing, T. Scott Sillett, and Peter P. Marra. "Quantifying the strength of migratory connectivity." Methods in Ecology and Evolution 9, no. 3 (2017): 513–24. http://dx.doi.org/10.1111/2041-210x.12916.
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Ambrosini, Roberto, Anders Pape Møller, and Nicola Saino. "A quantitative measure of migratory connectivity." Journal of Theoretical Biology 257, no. 2 (2009): 203–11. http://dx.doi.org/10.1016/j.jtbi.2008.11.019.
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Webster, Michael S., Peter P. Marra, Susan M. Haig, Staffan Bensch, and Richard T. Holmes. "Links between worlds: unraveling migratory connectivity." Trends in Ecology & Evolution 17, no. 2 (2002): 76–83. http://dx.doi.org/10.1016/s0169-5347(01)02380-1.
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Koehler, Geoff, Kevin J. Kardynal, Ron E. Jensen, and Keith A. Hobson. "An evaluation of migration fidelity of Ruby-throated Hummingbirds inferred from stable isotope methods." PeerJ 13 (April 7, 2025): e19252. https://doi.org/10.7717/peerj.19252.
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Knowledge of spatial connectivity between breeding and non-breeding locations of migratory birds and their breeding site fidelity are important for avian conservation. Ruby-throated Hummingbirds (RTHU, Archilochus colubris) breed in eastern Canada west to the Rocky Mountains and in the USA east of the Mississippi River and spend the non-breeding period in Mexico, Central America, and southern Florida, USA. We measured the hydrogen and oxygen stable isotopic compositions of adult RTHU tailfeathers (fourth rectrix) from three breeding locations in North America to estimate migratory connectivity between breeding and non-breeding grounds where feathers are grown. Feather δ2H values showed no statistical difference among the three sampling locations as well as disparate geographic assignments from one location on the non-breeding grounds in Costa Rica. Therefore, only weak evidence of migratory connectivity between breeding and non-breeding grounds could be ascertained for our sample of this species. The lack of migratory connectivity detected for Ruby-throated Hummingbirds using stable isotopes is consistent with origins from broad regions on the non-breeding grounds. However, it may also imply that precipitation δ2H values on the non-breeding grounds do not vary enough to detect a difference among our study populations. Sampling of additional populations in the eastern and southern portion of the species’ breeding range and the non-breeding grounds may reveal differences in migratory connectivity among populations and requires further investigation. The δ18O values of feathers correlated poorly to their δ2H values, an effect that may reflect the balance between metabolically driven processes and environmental water on the δ18O values of hummingbird tissues. This study provides the foundations for further investigations into migratory connectivity of RTHU using δ2Hf values and suggests potential avenues of study for use of δ18O values of tissues in metabolic research.
Dissertations / Theses on the topic "Migratory connectivity"
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Ibarguen, Siri B. "Population connectivity combining methods for estimating avian dispersal and migratory linkages /." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1079979416.
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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xvii, 143 p.; also includes graphics. Includes abstract and vita. Advisor: Thomas A. Waite, Dept. of Evolution, Ecology, and Organismal Biology. Includes bibliographical references (p. 135-143).
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Reese, Jessica. "A Range-wide Assessment of Migratory Connectivity for the Prothonotary Warbler Using Stable Hydrogen Isotopes." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4871.
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Populations of many species of migratory birds are declining, and an understanding of how populations are linked between the breeding and nonbreeding grounds is necessary in order to determine drivers of declines. While all current tracking technologies to study the movements of small songbirds are limited by their coarse resolution, tracking birds by measuring stable isotopes in keratin offers an advantage because it requires only a single capture and is cost-effective, which leads to robust sample sizes. While this tracking method is accurate, stable hydrogen isotope values measured in feathers (δ2Hf) are known to be variable within a site, and may be influenced by the hydrology of a site. In this study, we assessed sources of variation in δ2Hf values in a wetland-associated Neotropical migratory bird, the prothonotary warbler (Protonotaria citrea), by comparing δ2Hf values among ages, sexes, years and feather type. We found that age and year significantly influence δ2Hf values, and that differences between primaries and rectrices are statistically significant but generally small. We also tested the accuracy and precision of models to assign prothonotary warblers to their breeding origin using known-origin feathers. We assigned birds in a spatially-explicit manner using an interpolated surface of stable hydrogen values measured in precipitation (δ2Hp), and developed a species-specific calibration equation to account for the offset between δ2Hf and δ2Hp, which explained 51% of the variation in δ2Hf values. We incorporated breeding bird abundance as prior information in our assignment model, and compared two sources of abundance data: the Breeding Bird Survey and a spatio-temporal exploratory model developed with eBird data. The assignment model with no prior information was accurate (83% of birds correctly assigned to their true location of origin), but imprecise (50% of grid cells assigned as likely locations of origin). Incorporating abundance as prior information led to a decrease in accuracy (9-14% of birds correctly assigned) but higher precision (1% of grid cells assigned as likely). We also assigned prothonotary warblers to their breeding origin using feathers collected from across the nonbreeding range. We found that all nonbreeding sampling locations contained a mixture of birds whose origins spanned the majority of the breeding range, with no evidence of strong connectivity between the seasons. In the absence of strong connectivity, the influence of events occurring at one nonbreeding location will be widespread and diffuse across the breeding range. For prothonotary warblers, understanding connectivity can help conservation planners understand how nonbreeding season habitat destruction and other processes influence population dynamics. We recommend that future studies account for age and year variation in δ2Hf values when possible, and continue to examine the trade-off between precision gained and accuracy lost when using abundance as prior information.
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Skinner, Aaron. "Using GPS-Tracking to Fill Knowledge Gaps in the Full Annual Cycle of an Elusive Aerial Insectivore in Steep Decline." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1626886599137179.
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Amaral, Susana Cristina Amador Dias. "Permeability of small weirs for upstream fish passage." Doctoral thesis, ISA, 2020. http://hdl.handle.net/10400.5/21202.
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DeSaix, Matthew G. "Migratory patterns and population genetic structure in a declining wetland-dependent songbird." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5432.
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Understanding migratory connectivity is essential for assessing the drivers behind population dynamics and for implementing effective management in migratory species. Genetic markers provide a means to describe migratory connectivity, as well as incorporate population genetic analyses, however genetic markers can be uninformative for species with weak genetic structure. In this study, we evaluate range-wide population genetic structure and migratory connectivity in the prothonotary warbler, Protonotaria citrea, a wetland-dependent neotropical migratory songbird, using high-resolution genetic markers. We reveal regional genetic structure between sampling sites in the Mississippi River Valley and the Atlantic Seaboard with overall weak genetic differentiation among populations (FST = 0.0051). By ranking loci by FST and using subsets of the most differentiated genetic markers (200 – 3000), we identify a maximum assignment accuracy (89.7% to site, 94.3% to region) using 600 single nucleotide polymorphisms. We assign samples from unknown origin nonbreeding sites to a breeding region, illustrating weak migratory connectivity between prothonotary warbler breeding and nonbreeding grounds. Our results highlight the importance of using high-resolution markers in studies of migratory connectivity with species exhibiting weak genetic structure. Using similar techniques, studies may begin to describe population genetic structure that was previously undocumented, allowing us to infer the migratory patterns of an increasing number of species.
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Cardoso, Gabriela Ribeiro. "Monitorização da passagem para peixes do açude-ponte em Coimbra: otimização da metodologia de contagem." Master's thesis, Universidade de Évora, 2014. http://hdl.handle.net/10174/12064.
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A procura de água conduziu à necessidade do represamento do recurso e à construção de barragens e açudes que comprometem a conetividade longitudinal e as movimentações das populações de peixes migradores. Este efeito pode ser mitigado pela construção de Passagens para Peixes (PPP).
O presente estudo, realizado no âmbito do Programa de Monitorização da Passagem para Peixes do Açude-Ponte de Coimbra, entre Janeiro e Junho de 2013, pretendeu otimizar a metodologia de contagem visual dos peixes que utilizam o dispositivo e relacionar essa utilização com variáveis abióticas.
A utilização da PPP por parte das espécies diádromas foi sobretudo regulada pelo caudal. Para as espécies potamódromas, além do caudal outros preditores foram identificados como a temperatura e a turbidez. O pico de utilização da PPP foram os meses de Março e Abril para a lampreia-marinha, Abril e Maio para o sável, savelha e barbo do Norte e entre Janeiro e Abril para a boga-comum; ### ABSTRACT:
Monitoring of Açude-Ponte fishway in Coimbra: Optimization of counting methodology.
Water demand has led to the need of the impoundment of the resource and the construction of dams, that compromise the longitudinal connectivity of the rivers, impacting the populations of migratory fish. This effect can be mitigated with the construction of fishways.
This work, that was performed under the monitoring of the Açude-Ponte fishway in Coimbra, and between January and June of 2013, was intended to optimize the methodology of visual counting of the fish, and relate this pattern of use with abiotic variables.
The use of the fishway by the diadromous species was mainly regulated by the flow. For potamodromous species, in addition to the influence of flow, other predictors were identified, such as temperature and turbidity. The peak use of the fishway occurred in March and April for the sea lamprey, April and May for allis shad, twaite Shad and Iberian barbel and the period between January and April for Iberian nase.
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Dalleau, Mayeul. "Écologie spatiale des tortues marines dans le Sud-ouest de l’océan Indien : apport de la géomatique et de la modélisation pour la conservation." Thesis, La Réunion, 2013. http://www.theses.fr/2013LARE0037/document.
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Le déplacement animal joue un rôle déterminant dans la structuration spatiale et la dynamique des populations biologiques, en particulier des espèces fortement mobiles. L’espace et l’environnement font ainsi partie intégrante du cycle de vie des tortues marines. Ce travail de thèse propose de caractériser l’écologie spatiale des tortues marines, du stade juvénile au stade adulte, dans le Sud-ouest de l’océan Indien, principalement par l’usage de deux méthodes : la télémétrie satellitaire et la modélisation individu-centrée. Il montre en premier lieu que la phénologie de la reproduction de la tortue verte à travers la région est principalement liée à la température de surface de la mer au voisinage des sites de reproduction. Sont ensuite étudiés les patrons de dérive des nouveau-nés générés par les courants océaniques qui impacteraient inégalement leurs traits d’histoire de vie selon l’emplacement du site de naissance. Concernant le stade immature, les résultats suggèrent un cycle de développement trans-équatorial pour la tortue caouanne dans l’océan Indien. Pour le stade adulte, cette étude caractérise les couloirs et la connectivité migratoires de la tortue verte dans la région. Enfin, l’intégration de ces résultats permet de comprendre la structuration des patrons migratoires régionaux et leur influence sur la dynamique des populations. L’ensemble des connaissances acquises fournit un support concret d’aide à la décision pour la mise en place de plans de gestion et de conservation des tortues marines dans le Sud-ouest de l’océan Indien. Cela souligne l’importance d’une approche à grande échelle pour la protection d’un patrimoine biologique partagé par plusieurs nations<br>Animal movement is crucial to the ecology of spatially structured population, particularly for highly mobile species. Marine turtles’ life cycle is indeed closely related to spatial and environmental factors. This work analyses the spatial ecology of marine turtles, from early juvenile to adult stages, in the Southwest Indian Ocean, primarily through the use of two methods: satellite tracking and individual-based modeling. Firstly, this analysis argues that green turtle’s reproductive phenology across the region is mainly related to the sea surface temperature in the vicinity of the nesting site. Then, it shows how drifting trajectories of hatchlings in oceanic currents unevenly influence their life history traits depending on the position of the natal site. By tracking late juvenile stage, this work also suggests a trans-equatorial developmental cycle for loggerhead turtle in the Indian Ocean. At adult stage, it describes migratory corridors and connectivity for green turtle across the region. Finally, an integrative approach considering all these results allows for an understanding of the regional migratory patterns and their influence on population dynamics. The results of this work provide a practical policy decision tool for management and conservation of marine turtles in the Southwest Indian Ocean and highlight the need for a large-scale approach in the protection of biological resources and heritage shared by multiple nations
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CHABOT, AMY A. "The Impact of Migration on the Evolution and Conservation of an Endemic North American Passerine: Loggerhead Shrike (Lanius ludovicianus)." Thesis, 2011. http://hdl.handle.net/1974/6283.
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Migration acts as a selective force on the ecology and evolutionary trajectory of species, as well as presenting fundamental challenges for conservation. My thesis examines the impact of migration by exploring patterns of differentiation among and within migratory and non-migratory populations of the Loggerhead Shrike (Lanius ludovicianus). First, I use morphological, genotypic, stable isotope and leg band recovery data to quantify migratory connectivity in the species. Comparison across markers reveals a generally concordant pattern of moderate connectivity to the Gulf Coast, but overall mixing among populations on the wintering grounds. Combining data from multiple markers in a Bayesian framework improves the resolution of assignment of wintering birds to a breeding ground origin. Information on the species’ migratory patterns provides an explicit framework for interpreting patterns of genetic and ecological variation. I test two hypotheses regarding the interaction of gene flow and migratory habit: (1) migration facilitates gene flow; and (2) gene flow will occur most often along the axis of migration. Genetic population structure in migratory populations is weaker than in non-migratory populations, with gene flow facilitated by dispersal movements of females and first year breeders. As predicted, gene flow occurs most often along the north-south axis of migration, likely due either to opportunistic settling of dispersers or potentially, pairing on the wintering grounds. I investigate variation in the extent and scheduling of moult in relation to underlying genetic differences among populations, age, sex, body size, food availability and migratory habit. I find a pattern of interrupted moult across migratory populations, which may represent a trade-off between time allocated to breeding versus molt and migration. Loggerhead Shrikes in eastern and more southerly migratory populations undergo a greater extent of their moult on the breeding grounds and non-migratory individuals undergo a more extensive pre-formative moult than migratory individuals. I interpret this as suggesting a trade-off between resources allocated to molt versus those required for reproduction.<br>Thesis (Ph.D, Biology) -- Queen's University, 2011-01-25 15:54:36.593
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Rodrigues, Manuela dos Santos. "Mechanisms constraining distribution of juvenile Spoonbills Platalea leucorodia." Master's thesis, 2018. http://hdl.handle.net/10316/86157.
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Dissertação de Mestrado em Ecologia apresentada à Faculdade de Ciências e Tecnologia<br>As zonas húmidas são habitats de elevada importância ecológica dado que desempenham funções únicas e vitais para os ecossistemas, albergam uma enorme biodiversidade e fornecem vários serviços de ecossistema. As zonas húmidas e a vida selvagem a elas associadas estão a diminuir a grande ritmo, no entanto, na Europa, várias espécies de aves aquáticas estão, inesperadamente, a aumentar os seus números. Um exemplo notável é o do Colhereiro Europeu (Platalea leucorodia) cujos números aumentaram abruptamente nos últimos 50 anos, o que permitiu a (re)colonização de vários locais dentro da sua área de distribuição. Com este trabalho pretendemos perceber as razões por detrás da colonização de áreas Portuguesas pelos colhereiros e do seu aumento de população. Para isto, focámo-nos em três aspetos: 1) analisámos a base de dados Portuguesa de avistamentos de colhereiros marcados com anilhas coloridas, 2) comparámos a dieta e a ecologia trófica entre colhereiros de uma colónia tradicional e de uma recente, 3) seguimos com GPS os movimentos de juvenis de uma colónia tradicional para estudar a sua seleção de habitat e ecologia espacial. Este trabalho revelou vários aspetos da, quase desconhecida, ecologia dos colhereiros em Portugal. A Ria Formosa, a Ria de Alvor e o estuário do Tejo são as zonas húmidas mais importantes para colhereiros estrangeiros durante o Inverno e também as que abrigaram mais juvenis durante os movimentos dispersivos. Durante a época de reprodução, colhereiros Espanhóis e Holandeses foram comuns na Ria Formosa, Paúl do Boquilobo, Ria de Alvor e Estuário do Sado. A conectividade migratória entre colónias reprodutoras europeias e zonas húmidas portuguesas é baixa para as maiores populações (Holandesas 0.04 e Espanholas -0.14). Na Ria Formosa (colónia tradicional), os colhereiros consomem principalmente crustáceos, que são mais abundantes e fáceis de capturar, do que peixes. No Tejo, uma colónia recente, predam o Lagostim vermelho do Louisiana (Procambarus clarkii), o que suporta a ideia de que esta espécie invasora pode contribuir para o crescimento de populações de aves aquáticas. Os valores dos isótopos de carbono das penas e do sangue das crias de ambas as colónias foram diferentes, mas de acordo com as diferenças entre os locais, o que indica que os colhereiros alimentam as crias na proximidade das colónias. Os colhereiros juvenis da Ria Formosa usam vários tipos de habitat, incluindo artificiais, principalmente zonas húmidas intertidais (28%), poços de evaporação de sal (28%) e campos de arroz (23%). Os juvenis apresentaram heterogeneidade de movimentos, de padrões de migração e dispersão, e de tamanho das áreas vitais. No geral, concluímos que a expansão dos colhereiros em Portugal pode ser promovida pela possibilidade de predar espécies invasivas nas colónias recentes, pelo uso de habitats artificiais que podem funcionar como habitats substitutos nas colónias tradicionais, pela grande heterogeneidade de movimentos espaciais e de dispersão, e pela imigração de colhereiros reprodutores provenientes das colónias Europeias mais antigas. Com este trabalho reforçamos a necessidade de proteger as zonas húmidas, a necessidade de gerir corretamente os habitats artificiais para que beneficiem as espécies de aves aquáticas e, por fim, a importância de estudar populações sob a luz da teoria das metapopulações, protegendo e impondo medidas de conservação ao longo de toda a área de distribuição das espécies e durante todo o ano (épocas de reprodução, migração e de invernada).<br>Wetlands are habitats of ecological importance because they provide unique and vital functions for the ecosystems, hold an enormous biodiversity and provide several ecosystem services. Wetland areas and associated wildlife are declining at fast rate, however, in Europe, some waterbird species are, unexpectedly, increasing their numbers. A remarkable example is the Eurasian Spoonbill (Platalea leucorodia) whose numbers increased sharply in the last 50 years which enabled the (re)colonization of several areas across their range. With this work we aimed to understand the drivers behind the colonization of Portuguese areas by spoonbills and their population expansion. To address this, we focused on three major aspects: 1) analysed the Portuguese database of coloured marked spoonbills re-sightings, 2) compared the diet and trophic ecology of spoonbill in traditional and recently established colonies, and 3) tracked the movements of juveniles of a traditional colony to study their habitat selection and spatial ecology. This work unravelled unknown aspects of spoonbills’ ecology in Portugal. Ria Formosa, Ria de Alvor and Tejo estuary were the most important wetlands for foreign spoonbills during the wintering season, and those that sheltered more juveniles during dispersal movements. Throughout the breeding season, Spanish and Dutch spoonbills were common in Ria Formosa, Paúl do Boquilobo, Ria de Alvor and Sado estuary. Migratory connectivity between European breeding colonies and Portuguese wetlands was low for the largest breeding populations (Netherland 0.04 and Spain -0.14). In Ria Formosa (traditional colony), spoonbills rely more on crustaceans, that are more abundant and easy to catch, than fish. In Tejo estuary, a more recent colony, they feed on the Louisiana Crayfish (Procambarus clarkii), which supports the idea that this invasive species may contribute to the growth of waterbirds populations. Carbon isotopic values of feathers and blood from chicks of both colonies were different but in accordance with differences between areas which indicates that spoonbills feed their chicks in its vicinity. Juvenile spoonbills of Ria Formosa use several habitat types, including anthropogenic habitats, mainly intertidal wetlands (28%), salt evaporation ponds (28%) and rice fields (23%). Juveniles showed heterogeneity of movements, migratory and dispersal patterns, and home range sizes. Overall, we conclude that the expansion of spoonbills in Portugal can be promoted by: a) the possibility of preying on invasive species in recent colonies, b) the use of anthropogenic habitats that can act as substitute for the traditional wetland habitats, c) the great heterogeneity in dispersal and spatial movements, and d) the immigration of breeding spoonbills from the older European colonies. This reinforces the need to protect wetlands, the need to correctly manage anthropogenic habitats to benefit waterbird species, and finally, the importance of studying populations in the view of the metapopulation theory, conserving and taking measures across the entire range of species, and including breeding, migration and wintering seasons.
Books on the topic "Migratory connectivity"
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(Editor), Marylene Boulet, and D. Ryan Norris (Editor), eds. Patterns of Migratory Connectivity in Two Nearctic-Neotropical Songbird: New Insights from Intrinsic Markers (Ornithological Monographs, Number 61). American Ornithologists' Union, 2006.
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Achmadi, Amanda, Paul Walker, and Soon-Tzu Speechley, eds. Architectural Encounters in Asia Pacific. Bloomsbury Publishing Plc, 2024. http://dx.doi.org/10.5040/9781350421394.
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Architectural Encounters in Asia Pacificexplores the architecture of colonial trade and industry, revealing a complex network of transnational connections across the built heritage of the world’s most dispersed and culturally diverse region. A wide-ranging collection of case studies uncover these forgotten connections, drawing together stories of migratory architects, imperial commodities, and indentured labour. From Iran to Tasmania, Japan to Java, and Imperial China to the Pacific Islands, the chapters reveal how remnants of colonial trade and industry shed light on the many multi-faceted mobilities of the imperial age, and their enduring legacy in the postcolonial built environments of Australasia, the Pacific, Southeast Asia and beyond. The chapters also reveal deep strands of cultural influences and material imprints long neglected by national histories of architecture, and showcase new methodologies to analyse the interconnectivities and bordering practices which are shaping our experiences of the 21st century. With almost every chapter arising from new archival sources, this richly interdisciplinary volume brings together the work of architectural historians, geographers and heritage practitioners to provide a new understanding of the rich and contested history of this region. This book illuminates a new geography of architectural histories through explorations of intracolonial encounters and exchanges across Asia Pacific (1800s-1940s). It reveals a complex field of transnational connectivity manifest in the built environments across of the world’s most disperse and culturally diverse region. Buildings for industry, agriculture, and trade in Australia, the Pacific and South-East Asia share an important but forgotten history of encounter, exchange, and influence. Industrial heritage is also under-represented in World Heritage lists, with the Asia Pacific region poorly represented and global connections between industrial sites insufficiently understood. This book addresses these research gaps by examining unprecedented buildings for trade and industrial-scale resource extraction across Asia-Pacific’s multiple colonial entities and their successor nation-states. The various chapters collected in this book help uncover these forgotten connections, drawing together stories of migratory architects, imperial commodities, and indentured labour. They reveal how remnants of colonial trade and industry shed light on the many multi-faceted mobilities of the imperial age, and their enduring legacy in the postcolonial built environments of Australasia, the Pacific, Southeast Asia and beyond. They reveal the deep strands of cultural influence and material imprints long neglected by national histories of architecture. They also showcase new methodologies to analyse the dialectics of interconnectivity and bordering practice that are shaping our experiences of the 21st century. This richly interdisciplinary volume brings together the works of architectural historians, architects, and heritage practitioners to provide a holistic view of the rich and contested architectural and urban history of this region.
Book chapters on the topic "Migratory connectivity"
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Lapin, Katharina, Heino Konrad, Christoph Leeb, and Janine Oettel. "Species on the Move: Migration, Range Shifts, and Dispersal of Species." In Ecological Connectivity of Forest Ecosystems. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-82206-3_2.
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Abstract Migration is a fundamental biological phenomenon with significant impacts on the survival of populations and ecosystems. Its precise definition depends on the ecological discipline in focus, but it essentially entails the movement of an individual or population between habitats to ensure survival and enhance the likelihood of successful reproduction. Evolution has led to different types and mechanisms of migration ranging from passive to active movements, and from a few meter to migrations across biomes. Climate change has a strong effect on migration behaviour, leading to shifts in the ranges of populations and species as the quality and availability of habitats are altered. This chapter provides an overview of migratory behaviour and points out examples of variations caused by climate change. In addition, it discusses the context of migratory and ecological connectivity, both of which are essential for preserving biodiversity and facilitating adaptation. Understanding migration, range shifts, and dispersal is key to effective conservation and management efforts and should therefore be a primary focus of international collaborations.
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Mukerjee, Susmita. "Locating The Bengali Revolutionaries in Burma (1923-33): As Reflected in The History and Literature of the Wider Migratory Culture of Bay of Bengal." In Contiguity, Connectivity and Access. Routledge, 2022. http://dx.doi.org/10.4324/9781003365020-4.
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Prieto-Blanco, Patricia. "Afterword: Visual Research in Migration. (In)Visibilities, Participation, Discourses." In IMISCOE Research Series. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67608-7_18.
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AbstractProfound developments in terms of scale, diversity of digital media and prosumerism (García-Galera & Valdivia, 2014; Madianou, 2011) in the last decade have resulted in vast monitoring of movement, migratory or otherwise. While migrants have been outlined as digital natives, early adopters and heavy users of digital technologies (Ponzanesi & Leurs, 2014); the intersection of ICT (Information and Communications Technology) and migration is still under-researched (Oiarzabal & Reips 2012), Madianou’s (2011) work being a notable exception. As Leurs and Prabhakar highlight (2018, p. 247), the implications of the rise of ubiquitous and pervasive technologies (software and hardware) for the migration experience can be grouped in two sets of media practices. On the one hand, these technologies are used to reproduce and (forcefully) enforce top-down control by (state) authorities. On the other, they enable migrants - both voluntary and forced - to connect (dis)affectively, manage kinship and other relationships (Cabalquinto, 2018; Madianou, 2012; Prieto-Blanco, 2016), participate in collective processes (Siapera & Veikou, 2013; Martínez Martínez, 2017; Özdemir, Mutluer & Özyürek, 2019), establish a sense of belonging (Yue, Li, Jin, & Feldman, 2013; Budarick, 2015; Gencel-Bek & Prieto-Blanco, 2020), and move money across borders (Aker, 2018; Batista & Narciso, 2013). “[T]he transformed epistolary base and the communication infrastructure of the migrant experience” (Hedge 2016, p. 3), with their distinct affordances, impact on how migration is currently understood via a focus on connectivity and presence. Stay in touch. Remain within reaching distance. Leave, but let your presence linger.
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Marra, P. P., C. E. Studds, and M. Webster. "Migratory Connectivity." In Encyclopedia of Animal Behavior. Elsevier, 2010. http://dx.doi.org/10.1016/b978-0-08-045337-8.00072-3.
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Marra, Peter P., Emily Cohen, Autumn-Lynn Harrison, Colin E. Studds, and Michael Webster. "Migratory Connectivity." In Encyclopedia of Animal Behavior. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-809633-8.20761-9.
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Rubenstein, Dustin R. "Territoriality and Movement." In Animal Behavior. Oxford University Press, 2021. http://dx.doi.org/10.1093/hesc/9780197573822.003.0007.
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Where to Live Habitat Selection Territoriality Competition for Territories To Stay or Go Dispersal Migration Variation in Migratory Behavior and Connectivity Use cost–benefit analysis and evolutionary game theory to understand an animal’s decisions about habitat selection and territoriality. Consider the causes...
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"GOLDEN-WINGED WARBLER MIGRATORY CONNECTIVITY DERIVED FROM STABLE ISOTOPES." In Golden-winged Warbler Ecology, Conservation, and Habitat Management. CRC Press, 2016. http://dx.doi.org/10.1201/9781315372945-22.
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Ambrosini, Roberto, Andrea Romano, and Nicola Saino. "Changes in migration, carry-over effects, and migratory connectivity." In Effects of Climate Change on Birds. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198824268.003.0008.
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Studies of the timing (phenology) of bird migration provided some of the first evidence for the effects of climate change on organisms. Since the rate of climate change is uneven across the globe, with northern latitudes experiencing faster warming trends than tropical areas, animals moving across latitudes are subject to diverging trends of climate change at different stages of their annual life cycle, and, consequently, they can become mistimed with the local ecological conditions, with potentially negative effects on population size. This chapter reviews the modifications induced by climate change in different migration traits, like the timing of migration events, the distribution of organisms, and the direction and the speed of movements. It also considers the effects of ecological carry-over effects and migratory connectivity on the response of birds to climate change.
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Henry, Hugh A. L., and Robert L. Jefferies. "5 Opportunistic Herbivores, Migratory Connectivity, and Catastrophic Shifts in Arctic Coastal Systems." In Human Impacts on Salt Marshes. University of California Press, 2009. http://dx.doi.org/10.1525/9780520943759-007.
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Wesolowski, Amy, and Nathan Eagle. "Mobile Phones as a Lens into Slum Dynamics." In Online Research Methods in Urban and Planning Studies. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0074-4.ch020.
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The worldwide adoption of mobile phones is providing researchers with an unprecedented opportunity to utilize large-scale data to better understand human behavior. This chapter highlights the potential use of mobile phone data to better understand the dynamics driving slums in Kenya. Given slum dwellers informal and transient lifetimes (in terms of places of employment, living situations, etc.), comprehensive longitude behavioral data sets are rare. Working with communication and location data from Kenya’s leading mobile phone operator, the authors use mobile phone data as a window into the social, mobile, and economic dimensions of slum dwellers. The authors address questions about the functionality of slums in urban areas in terms of economic, social, and migratory dynamics. In particular, the authors discuss economic mobility in slums, the importance of social networks, and the connectivity between slums and other urban areas. With four years until the 2015 deadline to meet the Millennium Development Goals, including the goal to improve the lives of slum dwellers worldwide, there is a great need for tools to make development and urban planning decisions more beneficial and precise.
Conference papers on the topic "Migratory connectivity"
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Simonovic Alfirevic, SANJA, BORJAN BRANKOV, MARINA Nenkovic-Riznic, and MILENA STOJKOVIC. "CONNECTGREEN PROJECT AND THE FUTURE OF PLANNING INFRASTRUCTURE CORRIDORS." In IRASA International Scientific Conference. IRASA – International Research Academy of Science and Art, 2024. https://doi.org/10.62982/seti06.sasi.06.
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Abstract The ConnectGREEN project, conducted from 2018-2021 within the INTERREG Programme (DTP 072-2.3), focused on restoring and managing ecological corridors as green infrastructure in the mountain regions of the Danube basin. The project's primary aim was to develop a methodology for identifying migratory corridors for large mammals such as wolves, lynxes, and bears in the Carpathian region. It involved five countries and 13 institutions, led by WWF Romania. The Republic of Serbia participated as an IPA partner with two institutions: the Institute for Architecture and Urban & Spatial Planning of Serbia and Đerdap National Park. The project established guidelines to mitigate conflicts in these corridors and created a geodatabase on Natura 2000 designated areas and ecological corridors in Serbia. This opened new perspectives in Serbian strategic planning, offering fresh insights and proposals for planning infrastructure corridors. The results could inform new planning practices. This paper highlights the main methodological and strategic improvements in Serbian planning practice, especially for planning infrastructure corridors such as highways, motorways, and railways in nature-protected areas. It also provides guidance to enhance ecological connectivity between natural habitats, particularly within the Natura 2000 network and other protected areas in the Carpathian ecoregion of Serbia. Key words: ConnectGREEN, ecological corridors, Serbia, Đerdap National Park, infrastructure planning.
Reports on the topic "Migratory connectivity"
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Huijser, Marcel P., and James S. Begley. Exploration of opportunities to address the impacts of roads and traffic on wildlife around Rocky Flats National Wildlife Refuge. Western Transportation Institute, 2023. http://dx.doi.org/10.15788/1706129872.
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Rocky Flats National Wildlife Refuge (“the Refuge”) in Colorado near Denver, Colorado, has a history (1952-1 989) of producing components for nuclear weapons. The current goal for the area is “to restore and preserve the native prairie ecosystems, provide habitat for migratory and resident wildlife, conserve and protect habitat for Preble’s meadow jumping mouse, and provide research and education opportunities”. The grasslands of the Refuge are surrounded by busy roads to the west (Hwy 93, 18,000 AADT), north (Hwy 128, 4,200 AADT) and east (Indiana St. 7,000 AADT), and there are houses and associated roads on its southern boundary. Other open space with non-motorized trails and protected areas with predominantly grassland are to the west, north and east. Large ungulates, including mule deer, elk, and moose cross the roads. This results in large ungulate -vehicle collisions and the roads also represent a barrier to the movements of animals. Creek crossings under the roads are a concern as they are likely a barrier for species dependent on riparian habitat, including the Preble’s meadow jumping mouse. The objectives of the current project were to 1. Formulate measures that reduce collisions with large wild mammals, and 2. Formulate measures that improve connectivity across roads for large wild mammal species and one small mammal species in specific, the Preble’s meadow jumping mouse. We suggest large open span bridges at creek crossings (for deer, moose, black bear, mountain lion, and Preble’s meadow jumping mouse) and designated wildlife overpasses for elk and also f or mule deer. The crossing structures may be combined with human co-use to connect the trails on the refuge with the trail system in the surrounding areas.