A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Experimental manipulation of Blue Tit nest height does not support the thermoregulation hypothesis
Tekijät: Jarvinen PH, Kluen E, Tiiri M, Brommer JE
Kustantaja: BIRDLIFE FINLAND
Julkaisuvuosi: 2017
Journal: Ornis Fennica
Tietokannassa oleva lehden nimi: ORNIS FENNICA
Lehden akronyymi: ORNIS FENNICA
Vuosikerta: 94
Numero: 2
Aloitussivu: 82
Lopetussivu: 91
Sivujen määrä: 10
ISSN: 0030-5685
Verkko-osoite: https://www.ornisfennica.org/latest.htm
Tiivistelmä
Birds show immense variation in nest sizes within species. At least six different hypotheses have been forwarded to explain intraspecific variation in nest size in cavity nesting species. hut very few of those hypotheses have been tested experimentally. In our study, when nestlings were 2 days old. we manipulated the height of 182 Blue Tit (Cyanistes caeruleus) nests to either 5 cm or 11 cm while standardising their ectoparasite load and genetic and maternal background. In line with the hypothesis that larger nests provide thermoregulatory benefits, we expected experimentally enlarged nests to show increased growth of nestlings compared to shallow nests, or to improve female somatic condition. We found that the nest height manipulation affected the tail lenth of 16-day old nestlings, hut did not affect any other morphometric measure (tarsus length. body mass, head size and wing length). In addition, nest height manipulation had no impact on nestling survival and did not affect female body condition. Our results do not therefore provide strong support for the thermoregulatory hypothesis and suggest regional differences in the relationship between nest size and reproductive success,
Birds show immense variation in nest sizes within species. At least six different hypotheses have been forwarded to explain intraspecific variation in nest size in cavity nesting species. hut very few of those hypotheses have been tested experimentally. In our study, when nestlings were 2 days old. we manipulated the height of 182 Blue Tit (Cyanistes caeruleus) nests to either 5 cm or 11 cm while standardising their ectoparasite load and genetic and maternal background. In line with the hypothesis that larger nests provide thermoregulatory benefits, we expected experimentally enlarged nests to show increased growth of nestlings compared to shallow nests, or to improve female somatic condition. We found that the nest height manipulation affected the tail lenth of 16-day old nestlings, hut did not affect any other morphometric measure (tarsus length. body mass, head size and wing length). In addition, nest height manipulation had no impact on nestling survival and did not affect female body condition. Our results do not therefore provide strong support for the thermoregulatory hypothesis and suggest regional differences in the relationship between nest size and reproductive success,
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