One species of bumble bee that historically spanned the entire A.T. landscape is the rusty patched bumble bee (RPBB). The RPBB is rather large compared to other species in the genus. The workers and males have a distinct rusty patch (hence the name) on the top of their abdomen. Unfortunately, the beautiful sounds of RPBB’s bustling about has been silenced over the last three decades leading to the RPBB being the first bumble bee species listed under the Endangered Species Act. The RPBB’s entire population has dropped by 87 percent since the 1990s, with the only current recorded (2007-2020) population near the A.T. occurring within Sky Meadows State Park near Front Royal, Virginia. There are many variables that scientists attribute to this decline, including an introduction of deadly pathogens from European bees, the increased use of pesticides like neonicitinoides, climate change, small population dynamics, and habitat loss and degradation. Ill-timed or excessive mowing/tilling/grazing, monoculture farms, reforestation, invasion from non-native plants, and development are all forms of habitat loss and degradation. RPBB’s are also ground nesters so soil disturbance has the potential of destroying a colony and/or a colony’s queen.
Only five counties in the state have current RPBB occurrences, one of which is found along the A.T. in Sky Meadows State Park while all other occurrences are found west of the Trail in Central Virginia. The latest discovery of the RPBB in Bath County, Virginia, along an old Forest Service road pollinating Rhododendron at a higher elevation than is typical, has shed new light and a sense of optimism for this species known habitat requirements. Prior to this discovery, RPBB’s were mostly expected to be found in lowland open fields with a wide array of flowering plants. With a decline in healthy early-successional habitats across eastern U.S. forests, it was thought that the RPBB’s fate was rather grim. Now that habitat requirements have potentially expanded, RPBB could be found in many small canopy openings or even along many portions of the A.T. This discovery also provides further recognition that the over 5,000 acres of early-successional habitat that the Appalachian Trail Conservancy (ATC) cooperatively manages is increasingly important and has the potential to harbor additional RPBB populations.
The RPBB is a seemingly small part of the A.T. visitor experience, but one that could disappear from the Appalachian Trail completely. This steep decline is not an unfamiliar story for many pollinators across the United States and more specifically for a lot of endemic species across the Appalachian Trail landscape.
But what is the value of these declining species to the Trail experience? The value of the A.T. is most often represented as a human resource for recreation, recuperation, and in Benton MacKaye’s words “a refuge from the scramble of everyday worldly commercial life.” What is commonly overlooked is the fact that the health, value, and uniqueness of this refuge is inextricably linked to the health and intrinsic value of endemic species within the Appalachian forest ecosystem. Only through increased conservation and cooperative management efforts can this refuge continue to be protected and it can start with something as small as the rusty patched bumble bee.