Double keystone bird in a keystone species complex.

Area of Science:

• Ecology
• Subalpine Ecosystems
• Species Interdependence

Background:

• Colorado subalpine ecosystems exhibit complex species interdependencies.
• Keystone species play critical roles in maintaining ecosystem structure.
• The red-naped sapsucker (Sphyrapicus nuchalis) has a significant impact on its environment.

Purpose of the Study:

• To investigate the keystone roles of the red-naped sapsucker.
• To identify the species that depend on or benefit from sapsucker activities.
• To understand the potential consequences of sapsucker absence in the ecosystem.

Main Methods:

• Observational study of species interactions in a Colorado subalpine ecosystem.
• Documentation of nest site usage and feeding behaviors.
• Analysis of the sapsucker's role in creating habitat and providing food resources.

Main Results:

• Red-naped sapsuckers excavate nest cavities in fungus-infected aspens, essential for two swallow species.
• Sapsuckers create sap wells in willows, providing nourishment for themselves and numerous other species.
• A complex of sapsuckers, willows, aspens, and a heartwood fungus supports multiple species.

Conclusions:

• The red-naped sapsucker acts as a keystone species, facilitating nesting for swallows and providing resources for many other animals.
• The interdependence highlights the critical role of this species complex in subalpine ecosystem stability.
• The removal of any component of this complex could lead to unforeseen community-level disruptions.