Description

• Title:
  Shortening day length as a previously unrecognized selective pressure for early breeding in a bird with long parental care
• Creator:
  Podlaszczuk, Marcin;
  Wojciechowski, Zbigniew;
  Podlaszczuk, Patrycja;
  Minias, Piotr;
  Janiszewski, Tomasz;
  Wojciechowska, Agnieszka
• Contributor:
  Podlaszczuk Marcin, Łodz Society of Naturalists;
  Wojciechowski Zbigniew, University of Łodz, Department of Teacher Training and Biodiversity Studies;
  Podlaszczuk Patrycja, University of Łodz, Department of Teacher Training and Biodiversity Studies;
  Minias Piotr, University of Łodz, Department of Teacher Training and Biodiversity Studies;
  Janiszewski Tomasz, University of Łodz, Department of Teacher Training and Biodiversity Studies;
  Wojciechowska Agnieszka, University of Łodz, Department of Teacher Training and Biodiversity Studies;
  pminias@biol.uni.lodz.pl
• Description:
  Several different selective pressures have been suggested to explain an intense competition for early return to breeding grounds in birds. In this study we hypothesized that shortening day length during summer months may constitute additional selective force acting towards early breeding in avian species with long parental care. To test this hypothesis, we studied time budget and foraging activities of early-nesting and late-nesting white storks Ciconia ciconia from the Central-European population. We found that duration and distance of foraging trips increased significantly over the course of the reproductive season. The relative frequency of foraging trips increased at the expense of other activities, such as resting, plumage maintenance, and nest maintenance. Mean daily foraging duration increased with increasing day length in the early part of the season, with 0.68 h of foraging per individual per 13.16 h of day length in mid-April increasing to 7.42 h of foraging per individual during solstice (16.61 h of day length). Afterwards, mean foraging duration continued increasing in spite of decreasing day length, reaching 11.63 h of foraging per individual per 14.92 h of day length at the end of the season in mid-August, when storks were forced to continue foraging after sunset in order to meet energy requirements of fledglings. The results suggest that shortening day length during summer months may constitute a serious time constraint on food delivery rates to offspring for late-breeding pairs of white stork;
  European Social Fund and the Polish National Budget in the D-RIM project of the Human Capital Programme
• Object availability:
  free access
• Rights:
  Uznanie autorstwa 3.0 Polska;
  http://creativecommons.org/licenses/by/3.0/pl
• Date:
  2015.04.29;
  2014.11.23
• Type:
  Article
• Language:
  English
• Format:
  application/pdf
• Publisher:
  Springer Berlin Heidelberg
• Relation:
  Journal of Ornithology;Volume 156, Issue 2
• Subject:
  Ciconia ciconia;
  Foraging;
  Photoperiod;
  Timing of breeding;
  White stork
• Identifier:
  2193-7206;
  http://hdl.handle.net/11089/8461
• Data provider:
  Repozytorium Uniwersytetu Łódzkiego
• Can I use it?:
  check license
• Type:
  image