Pineywoods Wildlife Management

Endangered Species

Threats and Reasons for Decline

Old-growth logging.The main threat to the survival of the Red-cockaded Woodpecker is the decrease in the quality and quantity of old growth forest nesting habitat, primarily due to short rotation timber management. Fire suppression has also been detrimental due to the importance of controlling the midstory in Red-cockaded habitat. Because of this bird's requirement for old age pines, habitat loss takes along time to rectify. It may take 60-70 years to begin to provide suitable nesting habitat. Ideally, rotation ages of 100 years for loblolly, and 120 years or more for shortleaf and longleaf pine are needed to produce trees with the required amount of heartwood and frequency of red heart fungus.

Midstory encroahment.Some of the potential adverse effects of modern forestry on Red-cockaded Woodpecker habitat are: 1) short timber rotations (30 to 45 years) which result in loss of suitable nesting and roosting habitat, (2) leaving only cavity trees and cutting all others within a cluster reduces foraging habitat and does not allow for cavity tree replacement, (3) leaving isolated clusters surrounded by harvested areas reduces foraging habitat and may increase predation by forcing birds to cross large open areas, (4) removing all dead and dying trees results in loss of habitat for other cavity-nesters, thereby increasing competition for Red-cockaded Woodpecker nest cavities, (5) preserving cavity trees and removing other dominant trees in a colony makes the cavity tree the tallest in the area and subject to lightning strikes and wind damage, (6) careless use of pesticides may poison the birds directly or decrease there food supply below the minimum level needed for reproduction, and (7) noise and activity of forestry operations in the vicinity of a colony during the breeding season can disrupt nest success.

Cavity enlarged by raven.Finally, southern pine beetle infestations have been found to be a major cause of cavity tree loss in Texas. This is particularly true during southern pine beetle epidemics, such as the one that occurred on the Sam Houston National Forest in 1983 following hurricane Alicia. Active management is needed to reduce the loss of cavity trees to southern pine beetles.

The 1994 post-breeding population estimate for the Red-cockaded Woodpecker in Texas was 925 birds. An estimated 685 birds (74%) were found on federal lands (National Forest and National Park), 181 birds (20%) on private lands (timber companies and other private landowners), and 59 birds (6%) on state lands (State Forests and other state lands).

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