CLUTCH SIZE, BREEDING SUCCESS, AND PARENTAL SURVIVAL IN THE TREE SWALLOW ( IRIDOPROCNE BICOLOR )

Reproductive success and contaminants in tree swallows (Tachycineta bicolor) breeding at a wastewater treatment plant.

The uptake and effects of contaminants were measured in the insectivorous tree swallow (Tachycineta bicolor) at a wastewater treatment site. The study examined reproductive, immunological, and growth endpoints in tree swallows exposed to chlorinated hydrocarbon contaminants and to 4-nonylphenol in wastewater lagoons at the Iona Wastewater Treatment Plant, Vancouver (BC, Canada). Clutch size was...

Clutch Size and Parental Effort in the Great Tit Parusmajor

We experimentally reduced clutch size of Great Tits Parus major to investigate the effects on parental care (including Daily Energy Expenditure, DEE, measured with doubly labelled water), and the relationship between DEE and the residual reproductive value. The length of a working day was not affected, but the nestling phase was 0.7 days (4%) shorter in experimental clutches. Males fed reduced ...

Glucocorticoids and parental effort in tree swallows (Tachycineta bicolor)

CluTCh invESTmEnT in ThE ChilEan SwallOw (TaChyCineTa meyeni) ShifTS wiTh TimE Of brEEding and pOSiTiOn in ThE SEquEnCE Of laying

within a population, the sizes of eggs and clutches vary, and the combination of both determines a female’s reproductive investment. we investigated females’ investment in clutches of the Chilean Swallow (Tachycineta meyeni) at the southern limit of its range, where it breeds in an extreme climate. we analyzed variation in clutch, egg and yolk size in relation to the female’s condition, date of...

Date and parental quality effects in the seasonal decline in reproductive performance of the Tree Swallow Tachycineta bicolor : interpreting results in light of potential experimental bias

In many bird species early breeders have higher reproductive performance than late breeders from the same population. This could be caused by a reduction in environmental factors related to date per se (Date Hypothesis), or because poorer performers nest later (Parent Quality Hypothesis). We manipulated hatch date of Tree Swallows Tachycineta bicolor by switching clutches with different lay dat...