scholarly journals Autumn migration of Jack Snipe Lymnocryptes minimus in southern Sweden: results from ten years of crepuscular ringing

Ornis Svecica ◽  
2021 ◽  
Vol 31 ◽  
pp. 113-122
Author(s):  
Adam Bergner ◽  
Christer Elderud ◽  
Kent Person ◽  
Lars Gezelius
Keyword(s):  
Population Dynamics ◽  
Suitable Method ◽  
Autumn Migration ◽  
Southern Sweden ◽  
Present Information ◽  
Southern Central ◽  
Migratory Movements

The autumn migration of Jack Snipe Lymnocryptes minimus was studied using mist-netting at night along a muddy shoreline at Lake Tåkern in southern central Sweden. During ten consecutive autumn seasons ranging from mid-September to mid-November a total of 107 birds were captured, particularly within the first two hours after dusk. The peak of migration occurred in the first ten days of October with the juvenile birds on average passing a few days earlier than the adult birds. We present information on movements and ringing recoveries and review the challenges of ageing the species. We propose that crepuscular mist-netting near wetlands offering important staging grounds may be a suitable method to monitor the migratory movements, and possibly the population dynamics, of this little-studied species.

scholarly journals Seasonal differences in migration strategies of Red Kites (Milvus milvus) wintering in Spain

2021 ◽  
Author(s):  
Jorge García-Macía ◽  
Javier Vidal-Mateo ◽  
Javier De La Puente ◽  
Ana Bermejo ◽  
Rainer Raab ◽  
...  
Keyword(s):  
Spring Migration ◽  
Great Variability ◽  
Autumn Migration ◽  
Seasonal Differences ◽  
North Eastern ◽  
Wintering Areas ◽  
Satellite Transmitters ◽  
Migration Strategies ◽  
Migratory Movements ◽  
Milvus Milvus

AbstractRed Kite shows a great variability in its migration strategies: most individuals in north-eastern Europe are migrants, but there is also a growing number of sedentary individuals. Here, we tagged 49 Red Kites wintering in Spain with GPS/satellite transmitters between 2013 and 2020 to study the autumn and spring migration between the breeding or summering areas in Central Europe and the wintering quarters in Spain. In first place, differences between immatures and adults were found for spring migration. Adults began the spring migration towards the northeast in February–March while the immature individuals began to migrate significantly later and showing a wider date range (February-June). Adults also takes significantly less days to arrive at their destinations (12 ± 5 days) and cover more distance per day (134.2 ± 37.1 km/day) than immatures (19 ± 11 days and 98.9 ± 21.2 km/day). In second place, we also found differences between spring and autumn migration (excluding immatures). Spring migrations were clearly faster and with less stopovers days than autumn migrations. Autumn migration began between mid-October and late November and two different behaviours were observed: most birds made a quick migration direct to the wintering areas with only some days of stopovers, but others prolonged the migration with long stops along the route. These results highlight a great variation in the migratory movements of Red Kite, not only according to age but also between individuals and seasons.

Impact of climate change on the population dynamics of Ips typographus in southern Sweden

2007 ◽  
Vol 146 (1-2) ◽  
pp. 70-81 ◽  
Author(s):  
Anna Maria Jönsson ◽  
Susanne Harding ◽  
Lars Bärring ◽  
Hans Peter Ravn
Keyword(s):  
Climate Change ◽  
Population Dynamics ◽  
Ips Typographus ◽  
Southern Sweden ◽  
Impact Of Climate Change

Long-term winter-site fidelity in Song Sparrows (Melospiza melodia)

The Auk ◽  
2019 ◽  
Vol 136 (2) ◽  
Author(s):  
Tosha R Kelly ◽  
Keith A Hobson ◽  
Garth W Casbourn ◽  
Elizabeth A MacDougall-Shackleton ◽  
Scott A MacDougall-Shackleton
Keyword(s):  
Population Dynamics ◽  
Site Fidelity ◽  
Migratory Birds ◽  
Melospiza Melodia ◽  
Factors Affecting ◽  
Song Sparrows ◽  
Breeding Grounds ◽  
Wintering Areas ◽  
Migratory Movements

Abstract In migratory animals, the degree to which individuals return to the same wintering sites across multiple years can affect fitness and population dynamics, and thus has important implications for conservation. Despite this, long-term evaluations of wintering-site fidelity are rare for migratory birds: many populations are intensively studied on their breeding grounds but tracking the migratory movements of small birds once they leave the breeding grounds is challenging. To evaluate patterns of overwintering location and fidelity, we collected winter-grown claw tissue from 301 Song Sparrows (Melospiza melodia; 449 samples) captured in spring at their breeding grounds over 6 consecutive yr and assessed stable hydrogen isotope (δ2Hc) values to determine within-individual repeatability and between-year variation in wintering latitudes. We also retrieved useable data from 8 geolocators over 2 consecutive winters. Geolocator-derived wintering positions correlated with origins based on δ2Hc values. Consistent with previous findings, male δ2Hc values reflected more northerly wintering areas than those of females, indicating shorter latitudinal migration distances for males, but the magnitude of the sex difference varied across years. The distribution of wintering latitudes was generally consistent among years, except for the 2015 舑2016 winter, which had unusually negative δ2Hc values. Values of δ2Hc were repeatable for males but not for females, suggesting that winter-site fidelity could differ between sexes. The data presented here emphasize the importance of tracking migratory populations across multiple years to uncover factors affecting population dynamics.

ROOSTING BEHAVIOUR BY FLETCHEROMYIA FLETCHERI (DIPTERA: SARCOPHAGIDAE) IN SARRACENIA PURPUREA (SARRACENIACEA)

1999 ◽  
Vol 131 (6) ◽  
pp. 829-830 ◽  
Author(s):  
Margaret A. Krawchuk ◽  
Philip D. Taylor
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Larval Habitat ◽  
Sarracenia Purpurea ◽  
Larval Life ◽  
Pitcher Plant ◽  
Invertebrate Diversity ◽  
Present Information ◽  
Nectar Sources ◽  
Larval Life History

The flute-shaped leaves of the pitcher plant Sarracenia purpurea L. are a fluidfilled microhabitat rich in invertebrate diversity (Bradshaw 1983; Heard 1994; Hardwick and Giberson 1996; Harvey and Miller 1996; Miller et al. 1994). They are the obligate larval habitat for Fletcherimyia fletcheri (Aldrich) (Forsyth and Robertson 1975). Most literature reports of F. fletcheri present information only on larval life history and population dynamics (Fish and Hall 1978; Hardwick and Giberson 1996). Forsyth and Robertson (1975) state anecdotally that they observed adults feeding on flowers and other nectar sources within their study area. We believe that our observations represent the first report of adult F. fletcheri roosting within the flower heads of the pitcher plant.

Population dynamics of rice planthoppers, Nilaparvata lugens and Sogatella furcifera (Hemiptera, Delphacidae) in Central Vietnam and its effects on their spring migration to China

2016 ◽  
Vol 107 (3) ◽  
pp. 369-381 ◽  
Author(s):  
G. Hu ◽  
M.-H. Lu ◽  
H.A. Tuan ◽  
W.-C. Liu ◽  
M.-C. Xie ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Interspecific Competition ◽  
South China ◽  
Light Trap ◽  
Nilaparvata Lugens ◽  
Sogatella Furcifera ◽  
Source Areas ◽  
Early Migration ◽  
Central Vietnam ◽  
Southern Central

AbstractRice planthopper (RPH) populations of Nilaparvata lugens and Sogatella furcifera periodically have erupted across Asia. Predicting RPH population dynamics and identifying their source areas are crucial for the management of these migratory pests in China, but the origins of the migrants to temperate and subtropical regions in China remains unclear. In particular, their early migration to China in March and April have not yet been explored due to a lack of research data available from potential source areas, Central Vietnam and Laos. In this study, we examined the population dynamics and migratory paths of N. lugens and S. furcifera in Vietnam and South China in 2012 and 2013. Trajectory modeling showed that in March and April in 2012 and 2013, RPH emigrated from source areas in Central Vietnam where rice was maturing to the Red River Delta and South China. Early migrants originated from Southern Central Vietnam (14–16°N), but later most were from Northern Central Vietnam (16–19°N). Analysis of meteorological and light-trap data from Hepu in April (1977–2013) using generalized linear models showed that immigration increased with precipitation in Southern Central Vietnam in January, but declined with precipitation in Northern Central Vietnam in January. These results determined that the RPH originate from overwintering areas in Central Vietnam, but not from southernmost areas of Vietnam. Winter precipitation, rather than temperature was the most important factor determining the number of RPH migrants. Based on their similar population dynamics and low population densities in Central Vietnam, we further speculated that RPH migrate to track ephemeral food resources whilst simultaneously avoiding predators. Migrations do not seem to be initiated by interspecific competition, overcrowding or host deterioration. Nevertheless, S. furcifera establishes populations earlier than N. lugens South China, perhaps to compensate for interspecific competition. We provide new information that could assist with forecasting outbreaks and implementing control measures against these migratory pests.

THE INTERACTING EFFECTS OF PRICES AND WEATHER ON POPULATION CYCLES IN A PREINDUSTRIAL COMMUNITY

1998 ◽  
Vol 30 (1) ◽  
pp. 15-32 ◽  
Author(s):  
SUSAN SCOTT ◽  
S. R. DUNCAN ◽  
C. J. DUNCAN
Keyword(s):  
Population Dynamics ◽  
Population Size ◽  
Short Wavelength ◽  
Population Cycles ◽  
Adult Mortality ◽  
Epidemic Disease ◽  
And Migration ◽  
First Year Of Life ◽  
Migratory Movements ◽  
Grain Prices

The exogenous cycles and population dynamics of the community at Penrith, Cumbria, England, have been studied (1557-1812) using aggregative analysis, family reconstitution and time series analysis. This community was living under marginal conditions for the first 200 years and the evidence presented is of a homeostatic regime where famine, malnutrition and epidemic disease acted to regulate the balance between resources and population size. This provides an ideal historic population for an investigation of the direct and indirect effects of malnutrition. Throughout the period studied, a short wavelength oscillation in grain prices was apparently the major external factor that drove exogenous cycles in mortality, birth rate, and migration. In particular, the different responses of children to variations in food supply are emphasised; fluctuations in poor nutrition correlated significantly with the variations in mortality rates for infants (probably indirectly during pregnancy and directly during the first year of life) and for young children (via susceptibility to lethal infectious diseases). Migratory movements contributed to the maintenance of homeostasis in the population dynamics. A medium wavelength cycle in low winter temperatures was associated with a rise in adult mortality which, in turn, promoted an influx of migrants into this saturated habitat. A model incorporating these interacting associations between vital events and exogenous cycles is presented: grain prices were an important density-dependent factor and constituted the major component of the negative feedback of this population and drove the exogenous, short wavelength mortality cycles. Cycles of births and immigration provide a positive feedback for the build-up of susceptibles and the initiation of smallpox epidemics and increased population size.

A comparison of autumn migration strategies in robinserithacus rubeculaat a coastal and an inland site in southern Sweden

1993 ◽  
Vol 14 (2) ◽  
pp. 84-93 ◽  
Author(s):  
Sophie Ehnbom ◽  
Lennart Karlsson ◽  
Roland Ylvén ◽  
Susanne Åkesson
Keyword(s):  
Autumn Migration ◽  
Southern Sweden ◽  
Migration Strategies
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