Effects of Habitat Fragmentation on Pairing Success of Ovenbirds: Importance of Male Age and Floater Behavior

• Author(s) / Creator(s)

  • Bayne, Erin M.
  • Hobson, Keith A.

• Between 1996 and 1998, we compared pairing success of territorial male Ovenbirds (Seiurus aurocapillus) in forest fragments created by forestry (n 5 3) and agriculture (n 5 10) to contiguous forest plots (n 5 3) in the southern boreal mixedwood forest of central Saskatchewan. The percentage of Ovenbird males paired per site was lower in fragments created by agriculture (86 6 3%) and forestry (87 6 3%) than in contiguous forest (97 6 3%). At the individual level, second-year males (82%) were less likely to be paired than aftersecond- year males (94%), whereas males closer to edges were less likely to be paired than those in forest interiors. Although pairing success differed among landscapes, those differences were smaller than reported in studies conducted in eastern North America. The high density of birds in our study area may have resulted in intense intraspecific competition, which could have prevented unpaired individuals from maintaining territories. Removal experiments in 1997 and 1998 demonstrated floaters occurred in contiguous forest, but rarely occurred in fragments created by agriculture. The presence of floaters in contiguous forest suggests the ratio of breeding to nonbreeding males in forest fragments and contiguous forest may be similar, but that the strategy (i.e. floater vs. territorial) used by unpaired birds may differ among landscapes

• Date created

  2001

• Subjects / Keywords

  • Populations
  • Removal experiment
  • Selection
  • Seiurus-aurocapillus
  • American Redstarts
  • Conspecific attraction
  • Landscapes
  • Warblers Dendroica-Caerulescens
  • Forest fragmentation
  • Quality

• Type of Item

  Article (Published)

• DOI

  https://doi.org/10.7939/R3BZ91

• License

  This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.