Do birds select habitat or food resources? Nearctic-neotropic migrants in northeastern Costa Rica

PLoS One. 2014 Jan 28;9(1):e86221. doi: 10.1371/journal.pone.0086221. eCollection 2014.

Abstract

Nearctic-neotropic migrant birds need to replenish energy reserves during stopover periods to successfully complete their semiannual movements. In this study we used linear models to examine the habitat use of 11 migrant species in northeastern Costa Rica to better understand the influence of food and structural resources on the presence of birds during stopover periods. Our models indicated that frugivorous migrants primarily used food abundance, while insectivorous migrants chiefly used vegetation structure as cues for habitat use during stopover. In addition to habitat use models, we documented fruiting plant phenology and found a general relationship between migrant arrival and the timing of ripe fruit availability. Our results suggest that insectivorous migrants probably rely on structural features when using habitat because it may be inherently difficult to assess cryptic-arthropod availability during a short period of time in a novel habitat, such as stopover periods.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animal Migration / physiology
  • Animals
  • Birds / physiology*
  • Costa Rica
  • Ecosystem*
  • Seasons

Grants and funding

This project was funded in part by United States Department of Agriculture Forest Service's Redwood Sciences Laboratory, Klamath Bird Observatory, United States Fish and Wildlife Service Richard J. Guadagno Memorial Scholarship and the Stanley Harris Scholarship. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.