Breeding, Early-Successional Bird Response to Forest Harvests for Bioenergy

Area of Science:

• Forestry and Wildlife Ecology
• Avian Ecology
• Conservation Biology

Background:

• Forest regeneration after timber harvest creates vital early-successional bird habitat.
• Harvest residues (downed woody material) offer essential resources for these birds.
• Increasing bioenergy demand may lead to intensified removal of harvest residues.

Purpose of the Study:

• To assess the impact of varying woody biomass harvest intensities on early-successional bird communities.
• To document the utilization of harvest residues by early-successional birds in regenerating forests.

Main Methods:

• Field study conducted in North Carolina and Georgia, USA (2012-2014).
• Employed six treatments: varying percentages (0%, 15%, 30%) and distributions (dispersed, clustered) of woody biomass harvest.
• Monitored bird territories, species diversity, richness, and behaviors, alongside vegetation structure.

Main Results:

• Woody biomass harvest showed limited and short-lived effects on the bird community.
• Avian use of regenerating stands was mainly driven by vegetation structure development.
• Many bird species utilized downed wood for foraging and cover, especially before vegetation recovery.

Conclusions:

• Forest regeneration trajectory, particularly vegetation structure, is the primary determinant of avian habitat use.
• Harvest residues can offer crucial initial resources for early-successional birds.
• Management strategies should consider the dual role of vegetation and residues in supporting bird populations.