scholarly journals Fuelling in front of the barrier - are there age based behavioral differences in Garden Warblers Sylvia borin?

2014 ◽  
Author(s):  
Christos Barboutis ◽  
Ian Henshaw ◽  
Cecilia Kullberg ◽  
Stamatina Nikolopoulou ◽  
Thord Fransson
Keyword(s):  
Body Mass ◽  
Site Fidelity ◽  
Release Site ◽  
Fuel Load ◽  
First Year ◽  
Sahara Desert ◽  
Behavioral Differences ◽  
Stopover Site ◽  
Sylvia Borin ◽  
Fig Trees

Garden Warblers Sylvia borin were studied during autumn stopover in Crete before crossing the barrier of the Mediterranean Sea and the Sahara desert. Birds followed with transmitters show extensive stopover periods, which were longer in first-year birds, 16 days, compared with adult birds, 14 days. The distribution of body masses from birds trapped in fig trees were used to estimate the departure body mass and the results found indicate that both age categories on average depart with a fuel load close to 100% of lean body mass. The movement of transmitter birds shows differences between first-year and adult birds. Adult birds move further away from the release site and many also left the study area. Several were found settled outside the study area, up to 17 km away, indicating that they regularly make longer stopover movements. It is suggested that this might be a result of that they return to a place where they stayed during an earlier migration. It was shown that stopover site fidelity exists and nine garden warblers were recaptured in the area during a following autumn. The results found highlights the importance of stopover areas close to the Sahara desert.

scholarly journals Fuelling in front of the barrier - are there age based behavioral differences in Garden Warblers Sylvia borin?

2014 ◽  
Author(s):  
Christos Barboutis ◽  
Ian Henshaw ◽  
Cecilia Kullberg ◽  
Stamatina Nikolopoulou ◽  
Thord Fransson
Keyword(s):  
Body Mass ◽  
Site Fidelity ◽  
Release Site ◽  
Fuel Load ◽  
First Year ◽  
Sahara Desert ◽  
Behavioral Differences ◽  
Stopover Site ◽  
Sylvia Borin ◽  
Fig Trees

Garden Warblers Sylvia borin were studied during autumn stopover in Crete before crossing the barrier of the Mediterranean Sea and the Sahara desert. Birds followed with transmitters show extensive stopover periods, which were longer in first-year birds, 16 days, compared with adult birds, 14 days. The distribution of body masses from birds trapped in fig trees were used to estimate the departure body mass and the results found indicate that both age categories on average depart with a fuel load close to 100% of lean body mass. The movement of transmitter birds shows differences between first-year and adult birds. Adult birds move further away from the release site and many also left the study area. Several were found settled outside the study area, up to 17 km away, indicating that they regularly make longer stopover movements. It is suggested that this might be a result of that they return to a place where they stayed during an earlier migration. It was shown that stopover site fidelity exists and nine garden warblers were recaptured in the area during a following autumn. The results found highlights the importance of stopover areas close to the Sahara desert.

scholarly journals Philopatry to Stopover Site and Body Condition of Transient Reed Warblers During Autumn Migration Through Israel

The Condor ◽  
2000 ◽  
Vol 102 (2) ◽  
pp. 441-444 ◽  
Author(s):  
Kobi Merom ◽  
Yoram Yom-Tov ◽  
Robin McClery
Keyword(s):  
Body Mass ◽  
Body Condition ◽  
Wing Length ◽  
First Year ◽  
Sahara Desert ◽  
Stopover Site ◽  
Acrocephalus Scirpaceus ◽  
The Mean ◽  
High Degree ◽  
Mass Increase

Abstract Philopatry to stopover site and changes in body condition of migrating Reed Warblers Acrocephalus scirpaceus were studied in Bet Shean Valley, Israel, where warblers were netted throughout the year. Although the majority of birds were seen only once, the proportion of transients seen twice or more in different years is comparable to the figure for summer residents returning between years, indicating a high degree of philopatry among transients. Transients get heavier with longer duration of stay, up to about 15 days, after which body mass increase appears to level off at about 3 g. Change in body condition, taken to be body mass divided by wing length, also was noted, albeit of less significance. The mean date of arrival in the autumn of birds in their first year was about 20 days later than that of older birds. Reed Warblers use their time effectively to replenish their body mass and improve their condition before starting the dangerous crossing of the Sahara Desert.

scholarly journals Cheetahs (Acinonyx jubatus) running the gauntlet: an evaluation of translocations into free-range environments in Namibia

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1346 ◽  
Author(s):  
Florian J. Weise ◽  
Joseph R. Lemeris ◽  
Stuart J. Munro ◽  
Andrew Bowden ◽  
Cicelia Venter ◽  
...  
Keyword(s):  
High Risk ◽  
Site Fidelity ◽  
Average Distance ◽  
Release Site ◽  
First Year ◽  
Private Land ◽  
Population Declines ◽  
Conservation Areas ◽  
Acinonyx Jubatus ◽  
Free Range

Following dramatic range and population declines, the cheetah is Africa’s most endangered large felid. In Namibia, private land managers still trap cheetahs but increasingly consider moving animals instead of killing them. Across Africa, managers have translocated perceived conflict carnivores for decades, but rarely evaluated their actions. We analyse the outcomes of 15 cheetah translocations (for 23 adults and 10 dependent offspring) into free-range environments in Namibia. We released cheetahs at an average distance of 419.6 km ± 216.1 km SD (range: 71–816 km) after captive periods ranging from 1–1,184 days (350.6 days ± 439.0 days SD). An individual’s ability to survive the first year predominantly determined the overall translocation success of 40%. Post-release conflict and homing had less impact on success. Cheetah survival was lowest in the first three months after release. Human persecution (50% of deaths) and spotted hyaenas (29% of deaths) had the highest effect on survival. The degree of habituation to humans acquired during captivity significantly influenced chances of survival. Cheetahs surviving the initial post-release period (∼90 days) often settled into ranges and females reproduced successfully. However, all individuals exhibited extensive movements, frequently roaming >4,000 km2in the first six months after release (with a maximum of 19,743 km2in 112 days), resulting in low release site fidelity. Soft release and larger recipient area size did not improve site fidelity. Based on these outcomes, we evaluated which unfenced conservation areas in Namibia could potentially receive cheetahs. We found that there are currently few public and/or private reserves large enough to contain the movement profiles we observed in this study. This suggests that most translocations will result in cheetahs re-entering farmlands where they face a high risk of persecution. In conclusion, translocations into unconfined areas can successfully conserve individual cheetahs. Due to high mortality and unpredictable outcomes, however, conservation efforts need to focus on improving tolerance of cheetahs in commercial livestock and game farming areas in order to reduce the number of indiscriminately trapped animals.

When and where to fuel before crossing the Sahara desert – extended stopover and migratory fuelling in first-year garden warblers Sylvia borin

2008 ◽  
Vol 39 (2) ◽  
pp. 133-138 ◽  
Author(s):  
Thord Fransson ◽  
Christos Barboutis ◽  
Roger Mellroth ◽  
Triantaphyllos Akriotis
Keyword(s):  
First Year ◽  
Sahara Desert ◽  
Sylvia Borin

scholarly journals Sex, age, molt strategy, and migration distance explain the phenology of songbirds at a stopover along the East Asian flyway

2021 ◽  
Vol 75 (1) ◽  
Author(s):  
Jonas Wobker ◽  
Wieland Heim ◽  
Heiko Schmaljohann
Keyword(s):  
East Asian ◽  
Russian Far East ◽  
First Year ◽  
Large Set ◽  
Differential Migration ◽  
Breeding Area ◽  
Migration Distance ◽  
Stopover Site ◽  
Evolutionary Response ◽  
Migrant Birds

Abstract Sex- and age-specific differences in the timing of migration are widespread among animals. In birds, common patterns are protandry, the earlier arrival of males in spring, and age-differential migration during autumn. However, knowledge of these differences stems mainly from the Palearctic-African and Nearctic-Neotropical flyways, while detailed information about the phenology of migrant birds from the East Asian flyway is far scarcer. To help fill parts of this gap, we analyzed how migration distance, sex, age, and molt strategy affect the spring and autumn phenologies of 36 migrant songbirds (altogether 18,427 individuals) at a stopover site in the Russian Far East. Sex-differential migration was more pronounced in spring than in autumn, with half of the studied species (6 out of 12) showing a protandrous migration pattern. Age-differences in migration were rare in spring but found in nearly half of the studied species (11 out of 25) in autumn. These age effects were associated with the birds’ molt strategy and the mean latitudinal distances from the assumed breeding area to the study site. Adults performing a complete molt before the onset of autumn migration passed the study site later than first-year birds undergoing only a partial molt. This pattern, however, reversed with increasing migration distance to the study site. These sex-, age-, and molt-specific migration patterns agree with those found along other flyways and seem to be common features of land bird migration strategies. Significance statement The timing of animal migration is shaped by the availability of resources and the organization of annual cycles. In migrant birds, sex- and age-differential migration is a common phenomenon. For the rarely studied East Asian flyway, we show for the first time and based on a large set of migrant songbirds that earlier migration of males is a common pattern there in spring. Further, the timing and extent of molt explained age-differential migration during autumn. Adults molting their complete plumage at the breeding area before migration showed delayed phenology in comparison to first-year birds, which perform only a partial molt. This pattern, however, reversed with increasing migration distance to the study site. Since our results agree with the general patterns from the other migration flyways, similar drivers for differential migration may act across different flyway systems, provoking a similar evolutionary response.

scholarly journals Energy Stores, Oxidative Balance, and Sleep in Migratory Garden Warblers (Sylvia borin) and Whitethroats (Sylvia communis) at a Spring Stopover Site

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Andrea Ferretti ◽  
Scott R McWilliams ◽  
Niels C Rattenborg ◽  
Ivan Maggini ◽  
Massimiliano Cardinale ◽  
...  
Keyword(s):  
Food Intake ◽  
High Energy ◽  
Oxidative Status ◽  
Energy Reserves ◽  
Stopover Site ◽  
Garden Warbler ◽  
Oxidative Balance ◽  
Energy Stores ◽  
Sylvia Borin ◽  
Sylvia Communis

Synopsis Little is known about how songbirds modulate sleep during migratory periods. Due to the alternation of nocturnal endurance flights and diurnal refueling stopovers, sleep is likely to be a major constraint for many migratory passerine species. Sleep may help to increase the endogenous antioxidant capacity that counteracts free radicals produced during endurance flight and reduces energy expenditure. Here, we investigated the relationship between sleep behavior, food intake, and two markers of physiological condition—the amount of energy reserves and oxidative status—in two migratory songbird species, the garden warbler (Sylvia borin) and the whitethroat (Sylvia communis). In garden warblers, birds with high energy stores were more prone to sleep during the day, while this condition-dependent sleep pattern was not present in whitethroats. In both species, birds with low energy stores were more likely to sleep with their head tucked in the feathers during nocturnal sleep. Moreover, we found a positive correlation between food intake and the extent of energy reserves in garden warblers, but not in whitethroats. Finally, we did not find significant correlations between oxidative status and sleep, or oxidative status and energy stores. Despite our study was not comparative, it suggests that different species might use different strategies to manage their energy during stopover and, additionally, it raises the possibility that migrants have evolved physiological adaptations to deal with oxidative damage produced during migration.

Stopover Site Fidelity by Tennessee Warblers at a Southern Appalachian High-elevation Site

2012 ◽  
Vol 124 (2) ◽  
pp. 366-370 ◽  
Author(s):  
David F. Vogt ◽  
Mark E. Hopey ◽  
G. Rad Mayfield ◽  
Eric C. Soehren ◽  
Laura M. Lewis ◽  
...  
Keyword(s):  
Site Fidelity ◽  
High Elevation ◽  
Stopover Site ◽  
Southern Appalachian ◽  
High Elevation Site

Age and Sex Differences in Fuel Load and Biometrics of Aquatic WarblersAcrocephalus paludicolaat an Autumn Stopover Site in the Loire Estuary (NW France)

Ardeola ◽  
2014 ◽  
Vol 61 (1) ◽  
pp. 15-30 ◽  
Author(s):  
Dariusz Jakubas ◽  
Katarzyna Wojczulanis-Jakubas ◽  
Julien Foucher ◽  
Joanna Dziarska-Pałac ◽  
Hubert Dugué
Keyword(s):  
Sex Differences ◽  
Fuel Load ◽  
Stopover Site ◽  
Age And Sex

Abstract 18749: Body Mass Index, Leptin, and Recovery in Peripartum Cardiomyopathy: Results of the Multicenter IPAC Study

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Esa Davis ◽  
Julie Damp ◽  
Rami Alharethi ◽  
Gregory Ewald ◽  
Michael Givertz ◽  
...  
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
Post Partum ◽  
Peptide Hormone ◽  
Peripartum Cardiomyopathy ◽  
Study Entry ◽  
First Year ◽  
Biomarker Analysis ◽  
Lv Remodeling ◽  
The Impact

Introduction: The contribution of obesity and metabolic syndrome to the development of peripartum cardiomyopathy (PPCM) remains unknown. Leptin is a peptide hormone released by adipose tissue which may mediate impact of the obesity on cardiovascular function. We sought to evaluate their effect on myocardial recovery in PPCM in the multicenter Investigation of Pregnancy Associated Cardiomyopathy (IPAC) study. Methods: 100 women with new onset of PPCM were enrolled and serum obtained for biomarker analysis at entry. Myocardial function was assessed by echocardiography at entry, 2 months, 6 months and 12 months postpartum and LVEF calculated at a core lab. Leptin levels were measured by ELISA and the correlation of leptin with body mass index (BMI) and days post-partum evaluated. LVEF over the first year postpartum was compared by BMI at study entry (BMI >30 versus<=) and then compared by of Leptin levels (median). Results: The cohort was 30% black 65% white 5% other,age 30 + 6, mean BMI was 28.9 + 7.4 and LVEF 0.34 + 0.10 at study entry 31 + 25 days post-partum.Compared to those with a BMI<=30 women with a BMI > 30 had a similar LVEF at entry (LVEF BMI>30 vs < : 0.35 + 0.09 vs 0.34 + 0.10, p=0.60), but a lower LVEF at 2 month (0.39 + 0.12 vs 0.45 + 0.12, p=0.02), 6months (0.38 + 0.12 vs 0.53 + 0.09, p=0.02) and 12 months (0.50 + 0.13 vs 0.55 + 0.08, p=0.03). Leptin levels (mean 23.4 + 21.1 ng/ml, median 15.26 ng/ml) correlated with BMI (r=0.57, p<0.001). Higher leptin levels were associated with more remodeling (LVEDD for high/low leptin= 5.8 + 0.7/5.4 + 0.6, p=0.02) at entry and lower LVEF 2months (high/low= 0.40 + 0.12/ 0.46 + 0.11, p=0.02) which persisted at 12 months (high/low= 0.51 + 0.11/0.56 + 0.08, p=0.03). Leptin levels were significantly lower at entry in subjects who subsequently recovered to an LVEF>=0.50 (19.2 + 19.1 vs 31.8 + 22.9, p=0.006), and were higher in diabetics (p=0.01) and in blacks (p=0.03). Conclusions: In women with PPCM, obesity was associated with a lower LVEF at 6 and 12 months. Leptin levels correlated with BMI and were associated with greater LV remodeling at presentation and lower LVEF at 12 months. The impact of obesity and leptin on the development of cardiomyopathy warrants further investigation.

Growth of Southern Elephant Seals, Mirounga leonina, during their First Foraging Trip

1997 ◽  
Vol 45 (5) ◽  
pp. 447 ◽  
Author(s):  
Cameron M. Bell ◽  
Harry R. Burton ◽  
Mark A. Hindell
Keyword(s):  
Body Composition ◽  
Body Size ◽  
Body Mass ◽  
First Year ◽  
Mirounga Angustirostris ◽  
Mirounga Leonina ◽  
Elephant Seals ◽  
Southern Elephant Seals ◽  
First Year Of Life ◽  
Foraging Skills

A longitudinal study of growth of southern elephant seals, Mirounga leonina, during their first foraging trip was undertaken at Macquarie Island. On average, body mass increased by 75% while foraging at sea, with individuals growing at 0.34 ± 0.12 (s.d.) kg day-1 (n = 64), and spending 182 ± 51 days (n = 64) at sea. Relatively smaller changes in body length were recorded during the same period, suggesting that growth was composed primarily of adjustments to body composition, rather than increases in gross body size. This may be in response to the functional demands of pelagic life. Body size established early in life (birth mass and departure mass) positively influenced body mass upon return from the first foraging trip. Growth rate, however, was negatively related to departure mass for females, and this is hypothesised to be related to sex differences in body composition, as well as intrasex differences in foraging skills, diving ability and food- conversion efficiency. Despite this, there was no detectable age-specific sexual dimorphism in the first year of life. Animals that were at sea longer tended to return in better body condition. Interspecific comparison suggests that southern elephant seals grow more than do northern elephant seals, Mirounga angustirostris, and this difference may be related to prey abundance and distribution.

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