scholarly journals Why fly the extra mile? Latitudinal trend in migratory fuel deposition rate as driver of trans‐equatorial long‐distance migration

2016 ◽  
Vol 6 (18) ◽  
pp. 6616-6624 ◽  
Author(s):  
Yaara Aharon‐Rotman ◽  
Ken Gosbell ◽  
Clive Minton ◽  
Marcel Klaassen
Keyword(s):  
Deposition Rate ◽  
Long Distance ◽  
Latitudinal Trend ◽  
Fuel Deposition

Fuel loss and flexible fuel deposition rates in a long-distance migrant

2014 ◽  
Vol 68 (9) ◽  
pp. 1465-1471 ◽  
Author(s):  
Cas Eikenaar ◽  
Thomas Klinner ◽  
Tessina de Lille ◽  
Franz Bairlein ◽  
Heiko Schmaljohann
Keyword(s):  
Long Distance ◽  
Deposition Rates ◽  
Fuel Loss ◽  
Fuel Deposition

scholarly journals Fuel load and flight ranges of blackcaps Sylvia atricapilla in northern Iberia during autumn and spring migrations

2009 ◽  
Vol 55 (6) ◽  
pp. 401-410 ◽  
Author(s):  
Juan Arizaga ◽  
Emilio Barba
Keyword(s):  
Fatty Acids ◽  
Deposition Rate ◽  
Bird Migration ◽  
Migratory Birds ◽  
Fuel Load ◽  
Sylvia Atricapilla ◽  
Selective Pressures ◽  
Migration Strategies ◽  
Fuel Accumulation ◽  
Fuel Deposition

Abstract Fuel accumulation, mainly as fatty acids, is one of the main characteristics of migratory birds. Studying to what extent each population or species manages fuel load and how it varies along routes of migration or between seasons (autumn and spring migrations) is crucial to our understanding of bird migration strategies. Our aim here was to analyse whether migratory blackcaps Sylvia atricapilla passing through northern Iberia differ in their mean fuel loads, rate of fuel accumulation and ‘potential’ flight ranges between migration seasons. Blackcaps were mist netted for 4 h-periods beginning at dawn from 16 September to 15 November 2003 - 2005, and from 1 March to 30 April 2004 - 2006 in a European Atlantic hedgerow at Loza, northern Iberia. Both fuel load and fuel deposition rate (this latter assessed with difference in body mass of within-season recaptured individuals) were higher in autumn than in spring. Possible hypotheses explaining these results could be seasonal-associated variations in food availability (likely lower during spring than during autumn), the fact that a fraction of the migrants captured in spring could breed close to the study area and different selective pressures for breeding and wintering.

scholarly journals Western Sandpipers (Calidris Mauri) During the Nonbreeding Season: Spatial Segregation on a Hemispheric Scale

The Auk ◽  
2002 ◽  
Vol 119 (4) ◽  
pp. 922-928 ◽  
Author(s):  
Silke Nebel ◽  
David B. Lank ◽  
Patrick D. O'Hara ◽  
Guillermo Fernández ◽  
Ben Haase ◽  
...  
Keyword(s):  
Depth Distribution ◽  
Data Sets ◽  
Long Distance ◽  
Calidris Mauri ◽  
Nonbreeding Season ◽  
The Pacific ◽  
Western Sandpipers ◽  
Bill Length ◽  
Latitudinal Trend ◽  
Shaped Pattern

Abstract The nonbreeding distribution of Western Sandpipers (Calidris mauri) was documented using 19 data sets from 13 sites along the Pacific and Atlantic coasts of the Americas. Western Sandpipers showed latitudinal segregation with regard to sex and age. Females wintered farther south than males. A “U” shaped pattern was found with respect to age, with juveniles occurring at higher proportions at both the northern and southern ends of the range. Distribution of sexes might be affected by differences in bill length and a latitudinal trend in depth distribution of prey. For age class distribution, two different life-history tactics of juveniles might exist that are related to the higher cost of feather wear for juveniles compared to adults. Most juveniles complete three long-distance migrations on one set of flight feathers whereas adults complete two. Juveniles may winter either far north, thereby reducing feather wear induced by ultraviolet light, migration, or both, or far south and spend the summer on the nonbreeding area.

scholarly journals The impact of an invasive exotic bush on the stopover ecology of migrant passerines

2013 ◽  
Vol 36 (1) ◽  
pp. 1-11
Author(s):  
J. Arizaga ◽  
◽  
E. Unamuno ◽  
O. Clarabuch ◽  
A. Azkona ◽  
...  
Keyword(s):  
Deposition Rate ◽  
Bird Species ◽  
Exotic Plants ◽  
Fuel Load ◽  
General Hypothesis ◽  
Control Zone ◽  
Migrant Bird ◽  
Invasive Exotic ◽  
The Impact ◽  
Fuel Deposition

Migration is highly energy-demanding and birds often need to accumulate large fuel loads during this period. However, original habitat at stopover sites could be affected by invasive exotic plants outcompeting native vegetation. The impact of exotic plants on the stopover behavior of migrant bird species is poorly understood. As a general hypothesis, it can be supposed that habitat change due to the presence of exotic plants will affect migrants, having a negative impact on bird abundance, on avian community assemblage, and/or on fuel deposition rate. To test these predictions, we used data obtained in August 2011 at a ringing station in a coastal wetland in northern Iberia which contained both unaltered reedbeds (Phragmites spp.) and areas where the reedbeds had been largely replaced by the invasive saltbush (Baccharis halimifolia). Passerines associated with reedbeds during the migration period were used as model species, with a particular focus on sedge warblers (Acrocephalus schoenobaenus). The saltbush promoted a noticeable change on bird assemblage, which became enriched by species typical of woodland habitats. Sedge warblers departed with a higher fuel load, showed a higher fuel deposition rate, and stayed for longer in the control zone than in the invaded zone. Invasive plants, such as saltbush, can impose radical changes on habitat, having a direct effect on the stopover strategies of migrants. The substitution of reedbeds by saltbushes in several coastal marshes in Atlantic Europe should be regarded as a problem with potential negative cons equences for the conservation of migrant bird species associated with this habitat.

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