About: Should males come first? The relationship between offspring hatching order and sex in the black-headed gull Larus ridibundus     Goto   Sponge   NotDistinct   Permalink

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  • In birds with hatching asynchrony and sexual size dimorphism, chicks hatched earlier and later in the laying sequence usually suffer different mortalities due to uneven abilities to compete for food, especially in poor years. If sexes differ in vulnerability to environmental conditions, e.g., by having different food equirements due to differential growth rates, mothers can increase fitness by allocating sex according to the laying order, producing less vulnerable sex later rather than early in the clutch. By analysing variation in primary sex ratio using a PCR-based DNA technique, we tested this prediction in black-headed gull Larus ridibundus chicks where males may be the less viable sex under adverse conditions. The overall primary sex ratio of the population did not depart from parity. However, first hatched chicks were more likely to be males whereas last hatched chicks were more likely to be females. Both egg volume and hatchling body mass decreased with laying order irrespective of sex. Time of
  • In birds with hatching asynchrony and sexual size dimorphism, chicks hatched earlier and later in the laying sequence usually suffer different mortalities due to uneven abilities to compete for food, especially in poor years. If sexes differ in vulnerability to environmental conditions, e.g., by having different food equirements due to differential growth rates, mothers can increase fitness by allocating sex according to the laying order, producing less vulnerable sex later rather than early in the clutch. By analysing variation in primary sex ratio using a PCR-based DNA technique, we tested this prediction in black-headed gull Larus ridibundus chicks where males may be the less viable sex under adverse conditions. The overall primary sex ratio of the population did not depart from parity. However, first hatched chicks were more likely to be males whereas last hatched chicks were more likely to be females. Both egg volume and hatchling body mass decreased with laying order irrespective of sex. Time of (en)
Title
  • Should males come first? The relationship between offspring hatching order and sex in the black-headed gull Larus ridibundus
  • Should males come first? The relationship between offspring hatching order and sex in the black-headed gull Larus ridibundus (en)
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  • Should males come first? The relationship between offspring hatching order and sex in the black-headed gull Larus ridibundus
  • Should males come first? The relationship between offspring hatching order and sex in the black-headed gull Larus ridibundus (en)
skos:notation
  • RIV/61989592:15310/05:00010330!RIV10-MSM-15310___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(GD206/05/H012), S, Z(AV0Z60930519), Z(MSM 123100003), Z(MSM6007665801), Z(MSM6198959212)
http://linked.open...iv/cisloPeriodika
  • 6
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 542560
http://linked.open...ai/riv/idVysledku
  • RIV/61989592:15310/05:00010330
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • offspring sex ratio; hatching asymetry (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • DK - Dánské království
http://linked.open...ontrolniKodProRIV
  • [CF6DFF5008D4]
http://linked.open...i/riv/nazevZdroje
  • Journal of Avian Biology
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 36
http://linked.open...iv/tvurceVysledku
  • Honza, Marcel
  • Tkadlec, Emil
  • Oborník, Miroslav
  • Šimek, Jaroslav
  • Ležalová, Radka
http://linked.open...n/vavai/riv/zamer
issn
  • 0908-8857
number of pages
http://localhost/t...ganizacniJednotka
  • 15310
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