Corticosterone levels as indicators of habitat quality: effects of habitat segregation in a migratory bird during the non-breeding season

Oecologia ◽  
1998 ◽  
Vol 116 (1-2) ◽  
pp. 284-292 ◽  
Author(s):  
Peter P. Marra ◽  
Rebecca L. Holberton
Keyword(s):  
Breeding Season ◽  
Habitat Quality ◽  
Migratory Bird ◽  
Habitat Segregation

Dynamic occupancy models reveal within-breeding season movement up a habitat quality gradient by a migratory songbird

Ecography ◽  
2008 ◽  
Vol 31 (5) ◽  
pp. 592-600 ◽  
Author(s):  
Matthew G. Betts ◽  
Nicholas L. Rodenhouse ◽  
T. Scott Sillett ◽  
Patrick J. Doran ◽  
Richard T. Holmes
Keyword(s):  
Breeding Season ◽  
Habitat Quality ◽  
Occupancy Models ◽  
Migratory Songbird

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.

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 Severe recent decrease of adult body mass in a declining insectivorous bird population

2014 ◽  
Vol 281 (1786) ◽  
pp. 20140649 ◽  
Author(s):  
Sébastien Rioux Paquette ◽  
Fanie Pelletier ◽  
Dany Garant ◽  
Marc Bélisle
Keyword(s):  
Body Mass ◽  
Habitat Quality ◽  
Bird Species ◽  
Migratory Bird ◽  
Breeding Habitat ◽  
Tree Swallow ◽  
Adult Body Mass ◽  
Agricultural Intensity ◽  
Carry Over ◽  
Substantial Decline

Migratory bird species that feed on air-borne insects are experiencing widespread regional declines, but these remain poorly understood. Agricultural intensification in the breeding range is often regarded as one of the main drivers of these declines. Here, we tested the hypothesis that body mass in breeding individuals should reflect habitat quality in an aerial insectivore, the tree swallow ( Tachycineta bicolor ), along a gradient of agricultural intensity. Our dataset was collected over 7 years (2005–2011) and included 2918 swallow captures and 1483 broods. Analyses revealed a substantial decline of the population over the course of the study (−19% occupancy rate), mirrored by decreasing body mass. This trend was especially severe in females, representing a total loss of 8% of their mass. Reproductive success was negatively influenced by intensive agriculture, but did not decrease over time. Interestingly, variation in body mass was independent of breeding habitat quality, leading us to suggest that this decline in body mass may result from carry-over effects from non-breeding areas and affect population dynamics through reduced survival. This work contributes to the growing body of evidence suggesting that declines in migratory aerial insectivores are driven by multiple, complex factors requiring better knowledge of year-round habitat use.

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 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.

scholarly journals Seasonal matching of habitat quality and fitness in a migratory bird

2005 ◽  
Vol 272 (1578) ◽  
pp. 2319-2323 ◽  
Author(s):  
Tómas Grétar Gunnarsson ◽  
Jennifer A Gill ◽  
Jason Newton ◽  
Peter M Potts ◽  
William J Sutherland
Keyword(s):  
Habitat Quality ◽  
Migratory Bird ◽  
Seasonal Matching
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