Delineating pattern and process in tropical lowland : mealy parrot migration dynamics as a guide for regional conservation planning Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6682x604q

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Most reserves fail to capture the habitat heterogeneity necessary to maintain viable populations of wide-ranging species. Methods to determine defensible dimensions of reserves and reserve networks are needed. The primary goal of this study was to develop such methods for lowland tropical forests by examining habitat- and spatial-use patterns of the Mealy Parrot (Amazona farinosa) in northern Guatemala. Regional connectivity has been demonstrated by altitudinal migration of birds that track seasonal fruit availability; it is now recognized that a suite of habitats along the elevational gradient must be protected to conserve biodiversity of tropical montane ecosystems. However, in tropical lowlands, little is known about spatiotemporal patterns of resources and animals that rely on them. I considered the large-bodied, frugivorous Mealy Parrot a useful focal species because its movements and habitat use should be coupled with the ecological factors determining fruit distribution. Individual- and population-based methods were developed in this study. In each of 4 years, radio telemetry revealed that adult Mealy Parrots breeding in northeastern Guatemala engaged in predictable seasonal migrations within mature lowland forest. Although the area covered by these parrots was considerable (10,000 km²), more significant was the consistency of their movements and specific locations utilized. Canopy-based population surveys were used to estimate densities of all 6 locally occurring parrot species as a function of landscape type and season over a two-year period; the data suggest that migration is common in this parrot community. Mealy Parrots rely on mature lowland forest arrayed along regional environmental gradients. Over distances of a few hundred kilometers and a range in elevation of [approximately] 200 m, variation in fruiting phenology, forest composition, and rainfall shape this species' movement patterns. Basing reserve design on size alone is insufficient. Large protected areas, such as the 600 km² Tikal National Park and even the 21,000 km² Maya Biosphere Reserve, will not maintain this population of Mealy Parrots without inclusion of areas that encompass the range of spatiotemporal variability governing migration patterns. The Mealy Parrot occurs from Mexico through Amazonia and may serve as a valuable focal species for conservation planning in other parts of its range.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Language
Digitization Specifications
  • Master files scanned at 600 ppi (256 Grayscale, 24-bit Color) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W, 256 Grayscale, 24-bit Color), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2009-03-09T15:36:18Z No. of bitstreams: 1 Bjork_Robin_D_2005.pdf: 5127159 bytes, checksum: 385008bb962d5447dd5419d8759d9b70 (MD5)
  • description.provenance : Made available in DSpace on 2009-03-09T15:38:41Z (GMT). No. of bitstreams: 1 Bjork_Robin_D_2005.pdf: 5127159 bytes, checksum: 385008bb962d5447dd5419d8759d9b70 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2009-03-09T15:38:40Z (GMT) No. of bitstreams: 1 Bjork_Robin_D_2005.pdf: 5127159 bytes, checksum: 385008bb962d5447dd5419d8759d9b70 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2009-03-09T15:37:11Z (GMT) No. of bitstreams: 1 Bjork_Robin_D_2005.pdf: 5127159 bytes, checksum: 385008bb962d5447dd5419d8759d9b70 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items