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Negative effects of high temperatures during development on immediate post-fledging survival in Great Tits Parus major

100%

Rodriguez S., Diez-Mendez D., Barba E.

Acta Ornithologica

2016

tom 51

nr 2

We analyzed the effect of nest temperatures, fledging date, age at fledging, fledgling mass and size on post- fledging survival of Great Tits Parus major in eastern Spain. We manipulated temperature during nestling development in 26 nests (average temperature was 39.8, 34.6 and 26.4 °C for heated, control and cooled nest-boxes, respectively), and used radio-telemetry to monitor the survival of 48 nestlings (16 heated, 18 cooled, 14 controls) during the first 15 days after fledging. Heated chicks were lighter than control and cooled chicks. Estimated survival of heated fledglings was lower than that of controls. Additionally, survival of control fledglings increased with size, but this relationship was reversed for heated fledglings. Our results suggest that high temperatures experienced in the nest could have negative consequences on immediate post-fledging survival, and that smaller nestlings may deal more effectively with temperatures surpassing their optimal thermal range.

The timing of fledging and annual post-fledging survival of juvenile feral pigeons, Columba livia, in a city area [Pomerania, NW Poland]

80%

Hetmanski T.

Polish Journal of Ecology

2007

tom 55

nr 2

Research on the annual postfledging survival of young Feral Pigeons Columba livia was conducted in 1998-2001 in five breeding colonies located in the city centre of Słupsk (NW Poland, area 43 km²). Breeding pairs and their offspring were individually ringed. A total of 1016 clutches were studied, as was the fate of 809 fledglings. It was found that although fledglings were produced throughout the entire year, about 81-93% of young was leaving the nest in the period between April and September. The peak period of fledging occurred in May, August or June accordingly in successive study years. The dynamic of fledging in one year reflected the pairs’ egg laying activity occurring two months earlier. Juvenile mortality was highest during the first month after fledging and was found to be 45% of young birds. The main cause of death was hunger, as the young, inexperienced individuals were unable to compete successfully with adults for food at foraging areas. Loss of young clearly decreased with every successive month. The annual survival rate of juveniles produced in a calendar year was 30%. Almost all the juveniles surviving their first year of life joined the breeding population. Young produced in winter and spring had better survival rates than did those leaving the nest in summer, and especially, in autumn. The differences in survival rates found among the seasons of the year most likely resulted from changes in the pressure of competition for food in foraging areas.

Ograniczanie wyników

1 Acta Ornithologica

1 Polish Journal of Ecology

1 Barba E.

1 Diez-Mendez D.

1 Hetmanski T.

1 Rodriguez S.

1 2016

1 2007

Wyniki wyszukiwania

Negative effects of high temperatures during development on immediate post-fledging survival in Great Tits Parus major

The timing of fledging and annual post-fledging survival of juvenile feral pigeons, Columba livia, in a city area [Pomerania, NW Poland]