The Obama administration has increased protection for a humble bumblebee.
The rusty-patched bumblebee, once common across the continental United States, has been designated an endangered species by the Fish and Wildlife Service, the country’s first bumblebee, and the first bee from the lower 48 states, to be added to the register. Seven bees were previously listed as endangered, but they are found only in Hawaii and are not bumblebees.
Since the late 1990s, the population of the rusty-patched bumblebee has declined by nearly 90 percent, a result of a combination of factors, including exposure to pesticides, climate change, habitat loss and disease, federal wildlife officials said. The species, once found in 28 states, the District of Columbia and two Canadian provinces, is found today only in small pockets of its once-sprawling habitat.
The designation will accelerate efforts to protect the bees’ habitat and to reduce the use of pesticides that are killing them. It takes years to move a species to the endangered list, and the incoming administration would need to undertake a lengthy process to declare the bee population recovered if it wished to reverse the decision.
The role of these bees and other pollen-carrying insects is important, Tom Melius, the Fish and Wildlife Service’s Midwest regional director, said in a statement. “Pollinators are small but mighty parts of the natural mechanism that sustains us and our world,” he said. “Without them, our forests, parks, meadows and shrub lands, and the abundant, vibrant life they support, cannot survive, and our crops require laborious, costly pollination by hand.”
Around the world, the populations of bees, butterflies and other insects that promote plant growth are crashing, a threat not only to biodiversity but also to the global food supply. A study last year from a group associated with the United Nations warned that an increasing number of species that aid the growth of hundreds of billions of dollars’ worth of food each year face extinction.
“Obviously, it’s sad that anything has to get on the endangered list, but this really provides a great opportunity,” said Dennis vanEngelsdorp of the University of Maryland, a bee expert who applauded the government’s decision. “When you’re talking about saving the bumblebees, what you’re really talking about is saving the community.”
The kinds of measures that could protect the rusty-patched bumblebee could help many other pollinators, as well, by restoring habitats and food sources and restricting the use of pesticides — especially nicotine-based insecticides that have been linked to the decline in bee species and particularly to the plight of the rusty-patched bumblebee. Such measures are especially important with native bumblebees, Dr. vanEngelsdorp noted, as opposed to honeybees, which are maintained in large colonies and trucked around the country for commercial pollination.
Federal protection for the rusty-patched bumblebee has been a priority for the Xerces Society, a nonprofit organization dedicated to improving the health of pollinators, said Sarina Jepsen, who heads the group’s endangered species program.
“We are very pleased to see one of North America’s most endangered species receive the protection it needs,” she said.
When a species is listed as endangered, the Fish and Wildlife Service is required to design a recovery plan, which is often carried out by other agencies, nongovernmental organizations, universities and tribes. Other federal agencies have to check that their actions will not hurt an endangered species or its habitat, particularly when it comes to land use planning.
These actions are also likely to help other pollinating species that are in trouble, like monarch butterflies and honeybees. The service is reviewing three other species of bees to determine whether they ought to be listed as endangered as well: Franklin’s bumblebee, the western bumblebee and the yellow-banded bumblebee.
Bumblebees are particularly effective pollinators because, though they seem to prefer native flowers, they will pollinate pretty much anything and can fly in lower temperatures and lower light conditions than many other insects. They also use the technique of “buzz pollination,” in which they grab the pollen-producing part of the flower in their jaws and vibrate their wings, shaking the pollen loose, a process that seems to benefit plants like tomatoes, peppers and cranberries, according to the Fish and Wildlife Service.
Bumblebees are particularly important to agriculture, but agriculture is often unkind to them. A number of factors have reduced the habitat available to bees, including the use of pesticides and other chemicals, the domination of vast amounts of farmland by a single crop, and the use of some genetically modified crops and herbicides that prevent the growth of weeds in fields and wildflowers along their borders.
Climate change may also be shrinking the bees’ habitat because of drought, rising temperatures, more storms and mismatches in timing: Plants may start to flower at times when the bees are not ready to pollinate. It also presents serious threats to the migration patterns of monarch butterflies and other pollinators, such as honeybees.
While these species may not be as visible or as charismatic as polar bears and other mammals whose existences are threatened by a changing climate, placing them on the endangered list is a victory for the species and those who fight for it.
“Now we have a symbol to rally around,” Dr. vanEngelsdorp said.
A photograph of a bee accompanying an earlier version of this article, using information from a photo agency, was published in error. It showed a two-spotted bumblebee, not a rusty-patched bumblebee.