Fat accumulation and autumn migration strategy of Reed WarblersAcrocephalus scirpaceusand Sedge WarblersA.schoenobaenusin southern Sweden

2013 ◽  
Vol 28 (2) ◽  
pp. 69-76
Author(s):  
Bo Nielsen ◽  
Jan Rees
Keyword(s):  
Autumn Migration ◽  
Southern Sweden ◽  
Migration Strategy ◽  
Fat Accumulation

scholarly journals Evolution of moult-migration is directly linked to aridity of the breeding grounds in North American passerines

2020 ◽  
Vol 16 (6) ◽  
pp. 20200155
Author(s):  
Claudie Pageau ◽  
Christopher M. Tonra ◽  
Mateen Shaikh ◽  
Nancy J. Flood ◽  
Matthew W. Reudink
Keyword(s):  
North American ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Autumn Migration ◽  
Western North America ◽  
Migration Distance ◽  
Migration Strategy ◽  
Breeding Grounds ◽  
Breeding Migration ◽  
Moult Migration

To avoid energy allocation conflicts, birds generally separate breeding, migration and moult during the annual cycle. North American passerines typically moult on the breeding grounds prior to autumn migration. However, some have evolved a moult-migration strategy in which they delay moult until stopping over during autumn migration. Rohwer et al . (2005) proposed the ‘push–pull hypothesis' as an explanation for the evolution of this moult strategy, but it has not been empirically tested. Poor conditions on the breeding grounds at the end of the summer would push birds to depart prior to moult, while productive stopover locations would pull them. We tested for a relationship between moult-migration and breeding grounds aridity as measured by the normalized difference vegetation index. Our results strongly support the ‘push' aspect of the push–pull hypothesis and indicate that arid breeding grounds, primarily in western North America, would drive species to evolve stopover moult-migration, although this relationship may depend upon migration distance.

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 Parameters of the autumn migration stopover of the chiffchaff (Phylloscopus collybita Vieillot, 1817) (Sylviidae, Aves) in the conditions of the middle taiga in the Eastern Russian plain

2021 ◽  
pp. 319-334
Author(s):  
G. L. Nakul
Keyword(s):  
Body Weight ◽  
Migratory Birds ◽  
Accumulation Rate ◽  
Middle Taiga ◽  
Autumn Migration ◽  
Russian Plain ◽  
Taiga Zone ◽  
Fat Accumulation ◽  
Time And Energy ◽  
Average Body

Parameters of the autumn migration stopover of the chiffchaff Phylloscopus collybita (Vieillot, 1817) in the taiga zone of the Eastern Russian plain were estimated. The studies were carried out in 2015–2019, a total of 1,634 birds were included in our analysis. It has been established that migrating chiffchaffs can be conditionally divided into two groups. The first group consists of transit individuals leaving their stopover just on the day of arrival, without delay. The other group includes individuals who make stopovers for a longer period (4.87 days on average). For the birds of both groups, changes in their body weight and fat accumulation rate were revealed during one day and throughout the entire migration stopover. During an average migration stopover, birds retain their energy reserves at a certain level. In general, they accumulate no more than 5% of the average body weight in the population during the average stop period. A smaller proportion of migrants make multi-day stops when the fat accumulation rate is low. Every day of staying at a migration stopover leads to temporary surges and losses in body weight, with no increase in body fat. Birds, at the end of their migration season, spend more time and energy for looking for food. The part of migratory birds deciding to stop finds themselves in the most optimal conditions. This small group is the main reserve for preserving the population during the difficult period of migration. 

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

Variation in Autumn Migration Strategy in the First-Year Wood SandpipersTringa glareola

2010 ◽  
Vol 45 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Piotr Minias ◽  
Krzysztof Kaczmarek ◽  
Radosław Włodarczyk ◽  
Tomasz Janiszewski
Keyword(s):  
Autumn Migration ◽  
First Year ◽  
Migration Strategy

scholarly journals Alternate non-stop migration strategies of pied flycatchers to cross the Sahara desert

2016 ◽  
Vol 12 (4) ◽  
pp. 20151060 ◽  
Author(s):  
Janne Ouwehand ◽  
Christiaan Both
Keyword(s):  
Frequent Occurrence ◽  
Autumn Migration ◽  
Sahara Desert ◽  
Migration Strategy ◽  
Intermittent Flight ◽  
Migration Strategies

Each year more than two billion songbirds cross the Sahara, but how they perform this formidable task is largely unknown. Using geolocation tracks from 27 pied flycatchers, a nocturnally migrating passerine, we show that most birds made diurnal flights in both autumn and spring. These diurnal flights were estimated to be part of non-stop flights of mostly 40–60 h. In spring, birds flew across the Sahara, while autumn migration probably circumpassed part of the desert, through a long oversea flight. Our data contradict claims that passerines cross the Sahara by intermittent flight and daytime resting. The frequent occurrence of long non-stop flights to cross the desert shows migrants' physiological abilities and poses the question why this would not be the general migration strategy to cross the Sahara.

Differential timing of autumn migration between sex groups in adult European honey buzzards Pernis apivorus

2021 ◽  
pp. 175815592199736
Author(s):  
Michele Cento ◽  
Vittoria Malpassuti ◽  
Giacomo Dell’Omo ◽  
Nicolantonio Agostini
Keyword(s):  
Breeding Season ◽  
Field Survey ◽  
Central Africa ◽  
Autumn Migration ◽  
Gps Tracking ◽  
Southern Sweden ◽  
Central Mediterranean ◽  
Differential Timing ◽  
Made In

The European honey buzzard Pernis apivorus is a summer visitor in Europe, wintering mostly in West-central Africa. Previous studies concerning timing of autumn migration in relation to sex groups provided contrasting results. In particular, a field survey made in southern Sweden did not report differences in timing, while a satellite study via GPS tracking on six adults, three males, and three females, revealed that the latter departed earlier. The aim of this 4-year study is to further investigate the timing of autumn migration in this species carrying out observations at the Strait of Messina, a bottleneck located along the Central Mediterranean flyway, between August 10th and September 30th 2016–2019. Adult European honey buzzards concentrated the passage between late August early September, with females passing on average 5 days earlier than males. It is suggested that a different role of sexes concerning exhibition of territorial displays during the late breeding season, would explain differences between sex groups in timing of both moult and autumn migration.

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