scholarly journals Multiple density–dependence mechanisms regulate a migratory bird population during the breeding season

2003 ◽  
Vol 270 (1529) ◽  
pp. 2105-2110 ◽  
Author(s):  
Nicholas L. Rodenhouse ◽  
T. Scott Sillett ◽  
Patrick J. Doran ◽  
Richard T. Holmes
Keyword(s):  
Density Dependence ◽  
Breeding Season ◽  
Migratory Bird ◽  
Bird Population

scholarly journals Novel methods reveal shifts in migration phenology of barn swallows in South Africa

2011 ◽  
Vol 279 (1733) ◽  
pp. 1485-1490 ◽  
Author(s):  
Res Altwegg ◽  
Kristin Broms ◽  
Birgit Erni ◽  
Phoebe Barnard ◽  
Guy F. Midgley ◽  
...  
Keyword(s):  
South Africa ◽  
Breeding Season ◽  
Environmental Variability ◽  
Southern Oscillation ◽  
Bird Species ◽  
Breeding Population ◽  
Migratory Bird ◽  
Recent Climate ◽  
Breeding Grounds ◽  
Barn Swallows

Many migratory bird species, including the barn swallow ( Hirundo rustica ), have advanced their arrival date at Northern Hemisphere breeding grounds, showing a clear biotic response to recent climate change. Earlier arrival helps maintain their synchrony with earlier springs, but little is known about the associated changes in phenology at their non-breeding grounds. Here, we examine the phenology of barn swallows in South Africa, where a large proportion of the northern European breeding population spends its non-breeding season. Using novel analytical methods based on bird atlas data, we show that swallows first arrive in the northern parts of the country and gradually appear further south. On their north-bound journey, they leave South Africa rapidly, resulting in mean stopover durations of 140 days in the south and 180 days in the north. We found that swallows are now leaving northern parts of South Africa 8 days earlier than they did 20 years ago, and so shortened their stay in areas where they previously stayed the longest. By contrast, they did not shorten their stopover in other parts of South Africa, leading to a more synchronized departure across the country. Departure was related to environmental variability, measured through the Southern Oscillation Index. Our results suggest that these birds gain their extended breeding season in Europe partly by leaving South Africa earlier, and thus add to scarce evidence for phenology shifts in the Southern Hemisphere.

Seasonal Variations of Avifauna of Shallabug Wetland, Kashmir

1970 ◽  
pp. 20-34 ◽  
Author(s):  
Imran A Dar ◽  
Mithas A Dar
Keyword(s):  
Research Work ◽  
Bird Species ◽  
Migratory Bird ◽  
Current Status ◽  
High Power Field ◽  
Long Distance ◽  
Monthly Basis ◽  
Bird Population ◽  
Different Seasons ◽  
Vantage Points

The main thrust in this research work has been given on the evaluation of current status of Avifauna associated with Shallabug wetland. The main objectives were to evaluate the bird population fluctuation, to determine various threats to waterbirds and their habitats, and to present the remedial measures based on the key issues identified. For the purpose of present investigation, the study area was divided systematically into three study units of 700 m² each. Visual census method was used for the estimation of bird population. Visual counting was made with the help of high power field binocular (SG- 9.2) from respective vantage points. The birds were observed on the monthly basis in 2008 and the fluctuation in bird population was determined in different seasons: summer, autumn and winter.  The observations were made from 5:00 am to 7:00 am (when they come out from their resting place) and 6:00 pm to 7:00 pm (when they approach towards their resting place). The analysis of the results showed that the Shallabug Wetland is particularly important for migratory bird species and marsh land breeding species. The wetland was also found important for long distance migrants as a stopper site for feeding and resting. The bird population showed fluctuation with site differences as well as with changing seasons. Key words: Wetland, Shallabug, Avifauna, Fluctuation, Wetland managementDOI: 10.3126/jowe.v2i1.1853 Journal of Wetlands Ecology, (2009) vol. 2, pp 20-34

scholarly journals Linking warming effects on phenology, demography, and range expansion in a migratory bird population

2019 ◽  
Vol 9 (5) ◽  
pp. 2365-2375 ◽  
Author(s):  
José A. Alves ◽  
Tómas G. Gunnarsson ◽  
William J. Sutherland ◽  
Peter M. Potts ◽  
Jennifer A. Gill
Keyword(s):  
Range Expansion ◽  
Migratory Bird ◽  
Bird Population

scholarly journals Annual variation in long-distance dispersal driven by breeding and non-breeding season climatic conditions in a migratory bird

Ecography ◽  
2015 ◽  
Vol 38 (10) ◽  
pp. 1006-1014 ◽  
Author(s):  
Clark S. Rushing ◽  
Michele R. Dudash ◽  
Colin E. Studds ◽  
Peter P. Marra
Keyword(s):  
Breeding Season ◽  
Annual Variation ◽  
Migratory Bird ◽  
Climatic Conditions ◽  
Long Distance Dispersal ◽  
Long Distance

scholarly journals Seasonal mortality and sequential density dependence in a migratory bird

2015 ◽  
Vol 46 (4) ◽  
pp. 332-341 ◽  
Author(s):  
Eldar Rakhimberdiev ◽  
Piet J. van den Hout ◽  
Maarten Brugge ◽  
Bernard Spaans ◽  
Theunis Piersma
Keyword(s):  
Density Dependence ◽  
Migratory Bird ◽  
Seasonal Mortality

scholarly journals Non-breeding season events influence sexual selection in a long-distance migratory bird

2009 ◽  
Vol 276 (1662) ◽  
pp. 1619-1626 ◽  
Author(s):  
Matthew W Reudink ◽  
Peter P Marra ◽  
T. Kurt Kyser ◽  
Peter T Boag ◽  
Kathryn M Langin ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Reproductive Success ◽  
Breeding Season ◽  
Poor Quality ◽  
Migratory Bird ◽  
Lower Probability ◽  
Mixed Mating ◽  
Long Distance ◽  
High Quality ◽  
American Redstarts

The study of sexual selection has traditionally focused on events and behaviours immediately surrounding copulation. In this study, we examine whether carry-over effects from the non-breeding season can influence the process of sexual selection in a long-distance migratory bird, the American redstart ( Setophaga ruticilla ). Previous work on American redstarts demonstrated that overwintering in a high-quality habitat influences spring departure dates from the wintering grounds, advances arrival dates on the breeding grounds and increases apparent reproductive success. We show that the mixed-mating strategy of American redstarts compounds the benefits of overwintering in high-quality winter habitats. Males arriving to breed in Canada from high-quality winter habitats arrive earlier than males from poor-quality habitats, resulting in a lower probability of paternity loss, a higher probability of achieving polygyny and ultimately higher realized reproductive success. Such results suggest that the process of sexual selection may be influenced by events interacting throughout the annual cycle.

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