Pygmy Nuthatch2006

Pygmy Nuthatch2006

Summary:

Worldwide Species Action Plans

Pygmy Nuthatch action planAlthough pygmy nuthatch (Sitta pygmaea) populations appear to be stable range-wide, currently available data do not provide reliable information on the status or trend of populations in USDA Forest Service Rocky Mountain Region (Region 2). The species naturally patchy distribution, the inaccessibility of much of its habitat, and the road-based nature of the Breeding Bird Survey have collectively resulted in small sample sizes and a high degree of variability associated with pygmy nuthatch survey data in Region 2. Nevertheless, due to its association with unmanaged mature ponderosa pine (Pinus ponderosa) forests, a habitat type that has decreased substantially in recent years, the pygmy nuthatch is considered a management indicator species or species of local concern on numerous national forests within Region 2. Degradation of mature ponderosa pine forests through timber harvesting and fire suppression represents the primary threat to the health of pygmy nuthatch populations in Region 2. Both practices reduce pygmy nuthatch foraging, breeding, and roosting habitats directly by removing large live and dead trees, and indirectly by shifting forest structure from an open canopy comprised of few large trees to a closed canopy comprised of many small trees. Fire suppression and livestock grazing interact to form another important threat, an increased risk of stand-replacing wildfires that reduce habitat availability and quality. Because pygmy nuthatches roost communally, often in large numbers during the winter, roost cavity availability may be an important limiting factor.


  1. Sitta pygmaea brunnescens
  2. Sitta pygmaea flavinucha
  3. Sitta pygmaea elii
  4. Sitta pygmaea leuconucha
  5. Sitta pygmaea pygmaea
  6. Sitta pygmaea melanotis
  7. Sitta pygmaea
  8. NA, MA sw Canada to w Mexico


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