scholarly journals Comparing population trend estimates of migratory birds from breeding censuses and capture data at a spring migration bottleneck

2020 ◽  
Author(s):  
Ivan Maggini ◽  
Massimiliano Cardinale ◽  
Andrea Favaretto ◽  
Petr Voříšek ◽  
Fernando Spina ◽  
...  
Keyword(s):  
Migratory Birds ◽  
Spring Migration ◽  
Population Trend

scholarly journals Diet and Preparation for Spring Migration in Captive Hermit Thrushes (Catharus Guttatus)

The Auk ◽  
2003 ◽  
Vol 120 (2) ◽  
pp. 323-330
Author(s):  
Jennifer A. Long ◽  
Philip C. Stouffer
Keyword(s):  
Body Mass ◽  
Food Choice ◽  
Migratory Birds ◽  
Subcutaneous Fat ◽  
Spring Migration ◽  
Migratory Activity ◽  
Fat Reserves ◽  
Significant Difference ◽  
Catharus Guttatus ◽  
Fat Score

Abstract Seasonal changes in food choice by migratory birds often reflect changes in relative food abundance and increased energetic demand. Hermit Thrushes (Catharus guttatus) in southeastern Louisiana are highly frugivorous during winter but forage exclusively on arthropods just prior to spring migration. We hypothesized that this switch to an exclusively arthropod diet would lead to an increase in fat reserves compared to a frugivorous diet, and that fat birds would initiate migration sooner and display more migratory activity than lean birds. We tested these hypotheses on captive Hermit Thrushes maintained on either an arthropod only diet or a mixed fruit and arthropod diet and measured changes in fat score, body mass, and nocturnal migratory activity (Zugunruhe) from February to April 2000. We found that the arthropod-only treatment led to greater body mass and greater amounts of subcutaneous fat than the mixed fruit and arthropod treatment by the third week of the experiment. Despite those differences, body mass was not correlated with intensity of Zugunruhe. We also did not find a significant difference in intensity or onset of Zugunruhe between treatments. We concluded that because Hermit Thrushes are short-distance migrants, large fat reserves are not crucial for their migration. Consequently, fruit and arthropods appear to be equivalent with respect to migratory behavior.

Season, anthocyanin supplementation, and flight training have mixed effects on the antioxidant system of migratory European Starlings

The Auk ◽  
2021 ◽  
Author(s):  
Abigail E Frawley ◽  
Kristen J DeMoranville ◽  
Katherine M Carbeck ◽  
Lisa Trost ◽  
Amadeusz Bryła ◽  
...  
Keyword(s):  
Uric Acid ◽  
Antioxidant System ◽  
Migratory Birds ◽  
Migratory Bird ◽  
Spring Migration ◽  
Egg Laying ◽  
Flight Training ◽  
European Starlings ◽  
Antioxidant Diet ◽  
Gpx Activity

AbstractMigratory birds engage in 2 periods of endurance flight annually as they travel between summer breeding and overwintering grounds, and such endurance flights likely incur oxidative costs. These costs may differ between fall and spring migration, especially for females who must prepare for breeding and egg laying in spring. The objective of this study of a migratory bird was to test proposed hypotheses about how key components of the female’s antioxidant system differ in response to flight training in the fall and spring and to dietary antioxidant supplementation. We hand raised female European Starlings (Sturnus vulgaris) and fed them either a diet supplemented with dietary anthocyanins or a diet without added anthocyanins. We flew females in a wind tunnel for 15 days during fall and spring migration seasons and measured over time oxidative lipid damage (d-ROMs) and 3 components of the antioxidant system: nonenzymatic antioxidant capacity (OXY), uric acid, and glutathione peroxidase (GPx) activity. Prior to flight training, OXY and oxidative damage were lower in females during spring compared with fall, and females fed a low-antioxidant diet had consistently higher circulating uric acid. GPx activity decreased more in spring immediately after a long-duration flight. Females fed a high-antioxidant diet had a greater decrease in OXY after the 15-day flight training. Flight-trained females had higher circulating uric acid than untrained females immediately after the longest-duration flight and decreased GPx activity after the 15-day flight training. In sum, females upregulated enzymatic and nonenzymatic endogenous antioxidants in spring, and females fed a diet with less antioxidants appear to compensate by increasing circulating uric acid. Our findings emphasize the important role of dietary antioxidants for birds during migration, and similar flights in fall and spring likely represent distinct oxidative challenges in the life history of female birds.

Spring migration decisions in relation to weather are predicted by wing morphology among trans-Mediterranean migratory birds

2009 ◽  
Vol 24 (3) ◽  
pp. 658-669 ◽  
Author(s):  
Nicola Saino ◽  
Diego Rubolini ◽  
Jost Von Hardenberg ◽  
Roberto Ambrosini ◽  
Antonello Provenzale ◽  
...  
Keyword(s):  
Migratory Birds ◽  
Spring Migration ◽  
Wing Morphology ◽  
Migration Decisions

scholarly journals Migration distance affects how closely Eurasian wigeons follow spring phenology during migration

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Mariëlle L. van Toor ◽  
Sergey Kharitonov ◽  
Saulius Švažas ◽  
Mindaugas Dagys ◽  
Erik Kleyheeg ◽  
...  
Keyword(s):  
Migratory Birds ◽  
Later Life ◽  
Breeding Strategy ◽  
Spring Migration ◽  
Migration Distance ◽  
Spring Phenology ◽  
Trade Offs ◽  
Breeding Grounds ◽  
Migratory Strategy ◽  
The Impact

Abstract Background The timing of migration for herbivorous migratory birds is thought to coincide with spring phenology as emerging vegetation supplies them with the resources to fuel migration, and, in species with a capital breeding strategy also provides individuals with energy for use on the breeding grounds. Individuals with very long migration distances might however have to trade off between utilising optimal conditions en route and reaching the breeding grounds early, potentially leading to them overtaking spring on the way. Here, we investigate whether migration distance affects how closely individually tracked Eurasian wigeons follow spring phenology during spring migration. Methods We captured wigeons in the Netherlands and Lithuania and tracked them throughout spring migration to identify staging sites and timing of arrival. Using temperature-derived indicators of spring phenology, we investigated how maximum longitude reached and migration distance affected how closely wigeons followed spring. We further estimated the impact of tagging on wigeon migration by comparing spring migratory timing between tracked individuals and ring recovery data sets. Results Wigeons migrated to locations between 300 and 4000 km from the capture site, and migrated up to 1000 km in a single day. We found that wigeons migrating to more north-easterly locations followed spring phenology more closely, and increasingly so the greater distance they had covered during migration. Yet we also found that despite tags equalling only around 2% of individual’s body mass, individuals were on average 11–12 days slower than ring-marked individuals from the same general population. Discussion Overall, our results suggest that migratory strategy can vary dependent on migration distance within species, and even within the same migratory corridor. Individual decisions thus depend not only on environmental cues, but potentially also trade-offs made during later life-history stages.

Distribution of Nearctic-Neotropical migratory birds along a South American elevation gradient during spring migration

2015 ◽  
Vol 127 (1) ◽  
pp. 72 ◽  
Author(s):  
Camila Gómez ◽  
Valentina Gómez-Bahamón ◽  
Laura Cárdenas-Ortíz ◽  
Nicholas J. Bayly
Keyword(s):  
Migratory Birds ◽  
Elevation Gradient ◽  
Spring Migration ◽  
South American ◽  
Neotropical Migratory Birds

scholarly journals Temperature and rainfall anomalies in Africa predict timing of spring migration in trans-Saharan migratory birds

2007 ◽  
Vol 35 ◽  
pp. 123-134 ◽  
Author(s):  
N Saino ◽  
D Rubolini ◽  
N Jonzén ◽  
T Ergon ◽  
A Montemaggiori ◽  
...  
Keyword(s):  
Migratory Birds ◽  
Spring Migration ◽  
Rainfall Anomalies ◽  
In Trans

scholarly journals Weather at the winter and stopover areas determines spring migration onset, progress, and advancements in Afro-Palearctic migrant birds

2020 ◽  
Vol 117 (29) ◽  
pp. 17056-17062 ◽  
Author(s):  
Birgen Haest ◽  
Ommo Hüppop ◽  
Franz Bairlein
Keyword(s):  
Climate Change ◽  
Migratory Birds ◽  
Spring Migration ◽  
Long Distance ◽  
Spring Phenology ◽  
Migration Timing ◽  
Climate Change Effects ◽  
Breeding Grounds ◽  
Migration Phenology ◽  
Exogenous Factors

Climate change causes changes in the timing of life cycle events across all trophic groups. Spring phenology has mostly advanced, but large, unexplained, variations are present between and within species. Each spring, migratory birds travel tens to tens of thousands of kilometers from their wintering to their breeding grounds. For most populations, large uncertainties remain on their exact locations outside the breeding area, and the time spent there or during migration. Assessing climate (change) effects on avian migration phenology has consequently been difficult due to spatial and temporal uncertainties in the weather potentially affecting migration timing. Here, we show for six trans-Saharan long-distance migrants that weather at the wintering and stopover grounds almost entirely (∼80%) explains interannual variation in spring migration phenology. Importantly, our spatiotemporal approach also allows for the systematic exclusion of influences at other locations and times. While increased spring temperatures did contribute strongly to the observed spring migration advancements over the 55-y study period, improvements in wind conditions, especially in the Maghreb and Mediterranean, have allowed even stronger advancements. Flexibility in spring migration timing of long-distance migrants to exogenous factors has been consistently underestimated due to mismatches in space, scale, time, and weather variable type.

scholarly journals Timing of the Spring Migration of the Song Thrush Turdus Philomelos through Southern Italy

Ring ◽  
2015 ◽  
Vol 36 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Sergio Scebba ◽  
Michele Soprano ◽  
Michele Sorrenti
Keyword(s):  
Southern Italy ◽  
Spring Migration ◽  
Population Trend ◽  
Song Thrush

Abstract We studied the population trend and movements of the Song Thrush during the winter near the Tyrrhenian coast in the region of Latium, from 2012 to 2014, in order to establish the timing of spring migration. During standardized mist-netting we captured and ringed 431 birds. The data collected indicate that the study area is mainly visited by wintering thrushes with significant year-toyear fluctuations in the number of birds. Based on the information gathered during this study, confirmed by the results of other studies carried out in southern Italy and France, we assume that spring migration starts in Latium between the second and third decade of February.

Body condition and spring migration in female high-arctic barnacle geeseBranta leucopsis

1996 ◽  
Vol 2 (1) ◽  
pp. 247-251 ◽  
Author(s):  
Ingunn M. Tombre ◽  
Kjell E. Erikstad ◽  
Geir W. Gabrielsen ◽  
Karl-Birger Strann ◽  
Jeffrey M. Black
Keyword(s):  
Body Condition ◽  
High Arctic ◽  
Spring Migration
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