TITLE

Population and Colony-Level Determinants of Tertiary Sex Ratio in the Declining Barn Swallow

AUTHOR(S)
Saino, Nicola; Romano, Maria; Rubolini, Diego; Caprioli, Manuela; Ambrosini, Roberto; Boncoraglio, Giuseppe; Canova, Luca
PUB. DATE
February 2013
SOURCE
PLoS ONE;Feb2013, Vol. 8 Issue 2, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Sex ratio of adults (tertiary sex ratio, TSR) is a major feature of animal populations with consequences for their behaviour, genetic structure and viability. Spatial and temporal variation in TSR occurs within species but the mechanisms behind it are poorly understood. In this long-term study of a declining population of a socially monogamous, colonial, migratory bird, the barn swallow (Hirundo rustica), we first analyzed population-level variation in TSR ( = proportion of males) of yearlings at sexual maturation in relation to ecological conditions as gauged by annual survival rate of adults. TSR was male-biased both among yearlings and older individuals, but male bias of yearlings was more pronounced after years with larger decline in adult survival. Thus, male offspring were less susceptible to the adverse ecological conditions that cause increased mortality. Dispersal and settling site decisions can have major consequences on fitness via the effects of local TSR on mating and sperm competition. Breeding barn swallows are highly philopatric while natal dispersal is high and, together with mortality, is the main determinant of colony TSR. We thus also investigated the mechanisms of breeding colony choice by yearlings and found that TSR of new-settlers in a given colony and year was negatively predicted by TSR of returning, early arriving older individuals in that year, but not by overall TSR at the colony in the previous year. This suggests that in our male-biased population new-settler males respond to local TSR upon arrival to choose the sites with larger breeding opportunities. Hence, variation in ecological conditions as reflected by adult survival can shift the TSR of individuals recruiting into a local population, with potentially various demographic consequences. However, breeding site choice based on TSR tends to homogenize TSR at a population level likely by facilitating settling of dispersing males in colonies with less male-biased TSR.
ACCESSION #
87624662

 

Related Articles

  • A Continent-Wide Migratory Divide in North American Breeding Barn Swallows (Hirundo rustica). Hobson, Keith A.; Kardynal, Kevin J.; Van Wilgenburg, Steven L.; Albrecht, Gretchen; Salvadori, Antonio; Cadman, Michael D.; Liechti, Felix; Fox, James W. // PLoS ONE;Jun2015, Vol. 10 Issue 6, p1 

    Populations of most North American aerial insectivores have undergone steep population declines over the past 40 years but the relative importance of factors operating on breeding, wintering, or stopover sites remains unknown. We used archival light-level geolocators to track the phenology,...

  • Neophobia and social tolerance are related to breeding group size in a semi-colonial bird. Dardenne, Sophie; Ducatez, Simon; Cote, Julien; Poncin, Pascal; Stevens, Virginie // Behavioral Ecology & Sociobiology;Aug2013, Vol. 67 Issue 8, p1317 

    In semi-colonial species, some individuals choose to breed in isolation while others aggregate in breeding colonies. The origin and the maintenance of this pattern have been questioned, and inherited phenotype dependency of group breeding benefits has been invoked as one of the possible...

  • Variation in sperm morphometry and sperm competition among barn swallow ( Hirundo rustica) populations. Laskemoen, Terje; Albrecht, Tomas; Bonisoli-Alquati, Andrea; Cepak, Jaroslav; Lope, Florentino; Hermosell, Ignacio; Johannessen, Lars; Kleven, Oddmund; Marzal, Alfonso; Mousseau, Timothy; Møller, Anders; Robertson, Raleigh; Rudolfsen, Geir; Saino, Nicola; Vortman, Yoni; Lifjeld, Jan // Behavioral Ecology & Sociobiology;Feb2013, Vol. 67 Issue 2, p301 

    Spermatozoa vary greatly in size and shape among species across the animal kingdom. Postcopulatory sexual selection is thought to be the major evolutionary force driving this diversity. In contrast, less is known about how sperm size varies among populations of the same species. Here, we...

  • Switching Hemispheres: A New Migration Strategy for the Disjunct Argentinean Breeding Population of Barn Swallow (Hirundo rustica). Garcia-Perez, Belen; Hobson, Keith A.; Powell, Rebecca L.; Still, Christopher J.; Huber, Gernot H. // PLoS ONE;Jan2013, Vol. 8 Issue 1, Special section p1 

    Background: Barn Swallows (Hirundo rustica) breed almost exclusively in the Northern Hemisphere. However, since the early 1980's, a small disjunct breeding population has become established in eastern Argentina, presumably by birds previously derived from those breeding in North America....

  • Genetic Analyses of Some Central Anatolian Domestic Duck Populations with Inter Simple Sequence Repeat (ISSR): A Preliminary Study. Tunca, Rahsan Ivgin; Taskin, Atilla; Buyuk, Mithat // Pakistan Journal of Zoology;2015, Vol. 47 Issue 6, p1709 

    The aim of this study is to investigate the genetic structure of some domestic duck populations from Kirsehir and Yozgat provinces of the Central Anatolia region of Turkey. Blood samples were obtained from the venae cutenea ulnaris of 76 ducks from four different locations. Eleven ISSR primers...

  • Multiple mating opportunities boost protandry in a pied flycatcher population. Canal, David; Jovani, Roger; Potti, Jaime // Behavioral Ecology & Sociobiology;Jan2012, Vol. 66 Issue 1, p67 

    Protandry, the earlier arrival of males than females to breeding areas, is widespread in birds, but its underlying mechanisms are far from well understood. The two, not mutually exclusive most highly supported hypotheses to explain avian protandry postulate that it has evolved from intrasexual...

  • Invading together: the benefits of coalition dispersal in a cooperative bird. Ridley, Amanda // Behavioral Ecology & Sociobiology;Jan2012, Vol. 66 Issue 1, p77 

    Dispersal attempts can be costly and may often end in failure. Individuals should therefore only disperse when the benefits of dispersal outweigh the costs. While previous research has focussed on aspects of the individual that may affect dispersal success, social factors may also influence...

  • Mortality of Parental Mountain Plovers (Charadrius montanus) during the Post-hatching Stage. Dreitz, Victoria J. // Avian Conservation & Ecology;Jun2010, Vol. 5 Issue 1, p1 

    Monitoring, management, and conservation of grassland birds are topics of importance because of widespread population declines. Annual estimates of survival are available for many species, however knowledge of how survival varies on a seasonal basis remains poor. Information on the relative...

  • DISPERSAL, BAND ENCOUNTERS, AND CAUSES OF DEATH IN A REINTRODUCED AND RAPIDLY GROWING POPULATION OF PEREGRINE FALCONS. Katzner, Todd; Winton, Julia D.; Mcmorris, F. Arthur; Brauning, Daniel // Journal of Raptor Research;Mar2012, Vol. 46 Issue 1, p75 

    This article presents a study which examined the impact of dispersal and its correlates on Peregrine Falcon demography and encounter rates in eastern North America. Researchers searched for patterns of sex- and site-based differences in the dispersal movements of falcons from Pennsylvania. They...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics