Should I stay or should I go? Testing optimality models of stopover decisions in migrating birds

1999 ◽  
Vol 46 (4) ◽  
pp. 280-286 ◽  
Author(s):  
Thomas P. Weber ◽  
Thord Fransson ◽  
Alasdair I. Houston
Keyword(s):  
Migrating Birds ◽  
Optimality Models

Comparative Use of Riparian Corridors and Oases by Migrating Birds in Southeast Arizona

1998 ◽  
Vol 12 (4) ◽  
pp. 896-909 ◽  
Author(s):  
Susan K. Skagen ◽  
Cynthia P. Melcher ◽  
William H. Howe ◽  
Fritz L. Knopf
Keyword(s):  
Riparian Corridors ◽  
Migrating Birds

scholarly journals Sex and age-specific differences in wing pointedness and wing length in blackcaps Sylvia atricapilla migrating through the southern Baltic coast

2020 ◽  
Author(s):  
Agnieszka Ożarowska ◽  
Grzegorz Zaniewicz ◽  
Włodzimierz Meissner
Keyword(s):  
Wing Length ◽  
Sub Saharan Africa ◽  
Migration Route ◽  
Sylvia Atricapilla ◽  
Climatic Effects ◽  
Migration Distance ◽  
Baltic Coast ◽  
Southern Baltic ◽  
Sub Saharan ◽  
Migrating Birds

Abstract The blackcap Sylvia atricapilla shows a complex migratory pattern and is a suitable species for the studies of morphological migratory syndrome, including adaptations of wing shape to different migratory performance. Obligate migrants of this species that breed in northern, central, and Eastern Europe differ by migration distance and some cover shorter distance to the wintering grounds in the southern part of Europe/North Africa or the British Isles, although others migrate to sub-Saharan Africa. Based on ˃40 years of ringing data on blackcaps captured during autumn migration in the Southern Baltic region, we studied age- and sex-related correlations in wing pointedness and wing length of obligate blackcap migrants to understand the differences in migratory behavior of this species. Even though the recoveries of blackcaps were scarce, we reported some evidence that individuals which differ in migration distance differed also in wing length. We found that wing pointedness significantly increased with an increasing wing length of migrating birds, and adults had longer and more pointed wings than juvenile birds. This indicates stronger antipredator adaptation in juvenile blackcaps than selection on flight efficiency, which is particularly important during migration. Moreover, we documented more pronounced differences in wing length between adult and juvenile males and females. Such differences in wing length may enhance a faster speed of adult male blackcaps along the spring migration route and may be adaptive when taking into account climatic effects, which favor earlier arrival from migration to the breeding grounds.

Fuel Supply and Metabolic Constraints in Migrating Birds

1998 ◽  
Vol 29 (4) ◽  
pp. 521 ◽  
Author(s):  
Lukas Jenni ◽  
Susanne Jenni-Eiermann
Keyword(s):  
Fuel Supply ◽  
Migrating Birds

Optimality Models and the Test of Adaptationism

1994 ◽  
Vol 143 (3) ◽  
pp. 361-380 ◽  
Author(s):  
Steven Hecht Orzack ◽  
Elliott Sober
Keyword(s):  
Optimality Models

Ticks (Ixodoidea) on migrating birds in Cyprus, fall 1967 and spring 1968, and epidemiological considerations

1974 ◽  
Vol 64 (1) ◽  
pp. 97-110 ◽  
Author(s):  
Makram N. Kaiser ◽  
Harry Hoogstraal ◽  
George E. Watson
Keyword(s):  
Biological Diversity ◽  
Q Fever ◽  
Eastern Mediterranean ◽  
Mediterranean Area ◽  
Wide Distribution ◽  
Sub Saharan Africa ◽  
Boutonneuse Fever ◽  
Ixodes Frontalis ◽  
Haemaphysalis Concinna ◽  
Migrating Birds

AbstractMore or less cursory examination of migrating birds in Cyprus revealed 115 of 2580 southward (fall) migrants and 177 of 22015 northward (spring) migrants to be infested by 167 and 797 ticks, respectively. Most ticks on fall migrants were Hyalomma marginatum marginatum Koch; others were Ixodes frontalis (Panz.), I. ricinus (L.), Haemaphysalis concinna Koch, and H. punctata C. & F., all representative of the Eurasian fauna. Most ticks on spring migrants were H. m. rufipes Koch; others were Amblyomma lepidum Dön., A. nuttalli Dön., and A. variegatum (F.), representative of sub-Saharan Africa, and Argas streptopelia Kaiser, Hoogst. & Horner, Ixodes eldaricus Dzhaparidze, and I. redikorzevi Olen. which probably attached to the hosts in the eastern Mediterranean area. In Africa and Eurasia, 16 arboviruses have been recorded from eight of these tick species, and also the agents of boutonneuse fever, Siberian tick typhus, Q fever, and tularaemia. The epidemiological potential of migrating birds is enhanced by the multiplicity of pathogens that may infect them and the biological diversity of ticks that may infest them. The remarkably wide distribution of Crimean-Congo haemorrhagic fever virus in Africa and Eurasia is likely to be due to intercontinental carriage of the virus and ticks by migrating birds.

A comparison of nocturnal call counts of migrating birds and reflectivity measurements on Doppler radar

2004 ◽  
Vol 35 (4) ◽  
pp. 365-369 ◽  
Author(s):  
Andrew Farnsworth ◽  
Sidney A. Gauthreaux, Jr. ◽  
Donald van Blaricom
Keyword(s):  
Doppler Radar ◽  
Migrating Birds
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