Quantcast
Animals

Monarch Populations Plummet: 27% Decrease From Last Year

By David Mizejewski

The annual population status report for the monarch butterfly (Danaus plexippus) has been released showing a 27 percent decrease from last year's population.

Populations of this once-common iconic black and orange butterfly have plummeted by approximately 90 percent in just the last two decades. The threats to the species are the loss of habitat in the U.S.—both the lack of availability of milkweed, the only host food plant for monarch caterpillars, as well as nectar plants needed by adults–through land conversion of habitat for agriculture, removal of native plants and the use of pesticides and loss of habitat in Mexico from illegal logging around the monarchs' overwintering habitat. The new population numbers underscore the need to continue conservation measures to reverse this trend.

A Look at the Numbers

The population is evaluated by measuring the number of hectares occupied by the monarch butterflies in their overwintering habitat in Mexico. This year there are an estimated 109 million monarchs occupying just 2.91 hectares (7.2 acres), down from 150 million last year covering 4.01 hectares (9.9 acres).

The monarch population found west of the Rockies, which migrates to California rather than Mexico, has also severely declined but looks to have remained at the same level as last year.

Despite the alarming overall decline in the monarch population, there is some reason to be cautiously optimistic about efforts to help monarchs. Shortly after last year's population numbers were released, severe late-season storms hit monarch overwintering sites in Mexico, which scientists estimate killed anywhere from 7.4 percent of the population to as much as 50 percent of some of the overwintering colonies. This mortality was not reflected in the official population number last year, meaning that far fewer monarchs actually survived to migrate north in the spring of 2016.

In the best-case scenario of a 7.4 percent mortality, the monarch population that actually migrated north was just 139 million, not 150 million and so only decreased by 22 percent rather than the 27 percent based on pre-storm population numbers. In the worst-case hypothetical scenario of 50 percent mortality from the storms, only 75 million monarchs would have survived to migrate north in 2016 but were able to build up their population to the current number of 109 million, showing a possible 45 percent increase in population.

Whether it was favorable weather conditions throughout the rest of 2016 or the restoration of habitat for monarchs across the U.S.—or both—these various scenarios show that if given the right conditions and habitat, the species has the potential to recover.

Get Involved to Save Monarchs

Even so, in any scenario, the species' population remains dangerously low. Immediate action is needed to protect and restore monarch habitat. The good news is that on the local level, individuals can get involved by planting native milkweed and nectar plants right in their own yards.

The National Wildlife Federation is a member of the Monarch Joint Venture, a coalition of groups working together to save monarchs and has made monarch conservation a priority, working to recover the species in the following ways:

Mayors' Monarch Pledge

The National Wildlife Federation has engaged more than 260 mayors and other community leaders in pledging to restore monarch habitat by planting milkweed as a caterpillar host plant, nectar plants for the adult monarchs, eschewing pesticides and other actions that support monarch populations. These cities and municipalities in the monarchs' main migratory flyway, from Austin, Texas to the Great Lakes, are committing to create habitat and educate citizens about how they can make a difference at home.

Get involved in the Mayors' Monarch Pledge.

Garden for Wildlife

This signature program educates millions of Americans each year on how to restore habitat for birds, butterflies such as the monarch and other wildlife right their yards, gardens and neighborhoods. The National Wildlife Federation recognizes such garden spaces as Certified Wildlife Habitats. More than 200,000 Certified Wildlife Habitats have been designated in suburban yards, community gardens, schools, places of worship, parks, botanic gardens, zoos and other public spaces. Entire communities, cities and counties such as Austin, Texas and Broward County, Florida have achieved Certified Community Wildlife Habitat status.

Get involved in Garden for Wildlife.

Monarch caterpillar in a Schoolyard Habitat in Connecticut. Linda Swenson

National Pollinator Garden Network

The National Wildlife Federation has helped convene an unprecedented number of conservation and gardening organizations, as well as garden industry members, to launch the Million Pollinator Garden Challenge, a campaign to raise awareness on what Americans can do to help pollinators and register a million pollinator and monarch friendly gardens by the end of 2018.

Learn more about the National Pollinator Garden Network.

Large Landscape Habitat Work

The National Wildlife Federation is working with partners in the agriculture industry to establish more monarch-friendly practices such as adding preserving native plant buffer zones around fields and riparian areas, adjusting mowing schedules and spraying practices to minimize impacts to pollinator habitat. We are also working with the U.S. Fish and Wildlife Service, our state affiliates and state Wildlife Agencies to create state plans to conserve grasslands, establish power line right of way habitat and promote roadside habitat planting along monarch's main migratory route.

Learn more about Large Landscape Habitat Work.

Butterfly Heroes

This annual campaign aims at engaging kids and families in butterfly conservation. Participants pledge to plant butterfly gardens and receive a starter kit from the National Wildlife Federation which includes native milkweed or nectar plants for monarchs and educational and how-to information on creating a butterfly garden. This spring the campaign kicks off on March 27 and goes through May 19.

Get involved in Butterfly Heroes.

David Mizejewski is a naturalist, author, blogger and national media personality with the National Wildlife Federation.

Show Comments ()
Sponsored
Popular
South Carolina United Turtle Enthusiasts (S.C.U.T.E) unearthed three baby loggerheads after a nest inventory at Pawleys Island beach. Lorraine Chow

Sea Turtle Population Rebounding But Many Threats Remain

A new study published in Science Advances has found that most global sea turtles populations are recovering after historical declines.

The results from the analysis suggest that conservation programs actually work, and why we must defend the Endangered Species Act (ESA) that protects vulnerable plants and animals, and is currently under attack by political and business interests.

Keep reading... Show less
Popular
www.youtube.com

Baby Rhino Brings New Hope to India’s Manas National Park

A baby rhino spotted alongside its mother in Manas National Park, located in the northeastern Indian state of Assam, is an encouraging new sign that the rhino population in the protected area is on the upswing. The mother, named Jamuna, was rescued as a calf from Kaziranga National Park, located about 200 miles east of Manas and raised at the Center for Wildlife Rehabilitation and Conservation, a facility that cares for injured or orphaned wild animals run by Wildlife Trust of India/International Fund for Animal Welfare and the Assam Forest Department. She was moved to the Manas in 2008 as part of the country's rhino conservation efforts.

The calf is her second since 2013—a positive indication that despite concerns due to poaching of mature males, rhinos in Manas are reproducing.

Keep reading... Show less
Popular
Cedar Mesa Valley of the Gods in the Bears Ears National Monument in southeastern Utah. Bob Wick, BLM

Navajo Nation Readies Legal Action if Trump Shrinks Bears Ears National Monument

Interior Sec. Ryan Zinke's recommendation to reduce the size of the Bears Ears National Monument in Utah could spark a legal battle between the Navajo Nation and the Trump administration.

"We are prepared to challenge immediately whatever official action is taken to modify the monument or restructure any aspect of that, such as the Bears Ears Commission," Ethel Branch, Navajo Nation attorney general, told Reuters.

Keep reading... Show less
Popular
Jilson Tiu / Greenpeace

Nestlé, Unilever, P&G Among Worst Offenders for Plastic Pollution in Philippines Beach Audit

A week-long beach clean up and audit at Freedom Island in Manila Bay has exposed the companies most responsible for plastic pollution in the critical wetland habitat and Ramsar site—one of the worst locations for plastic pollution in the Philippines.

The Greenpeace Philippines and #breakfreefromplastic movement audit, the first of its kind in the country, revealed that Nestlé, Unilever and Indonesian company PT Torabika Mayora are the top three contributors of plastic waste discovered in the area, contributing to the 1.88 million metric tonnes of mismanaged plastic waste in the Philippines per year.

Keep reading... Show less
Sponsored
GMO
www.youtube.com

Arkansas Plant Board Backs Dicamba Ban Next Summer in Blow to Monsanto

The Arkansas Plant Board has approved new regulations that prohibit the use of dicamba from April 16 through Oct. 31, 2018 after receiving nearly 1,000 complaints of pesticide misuse in the state.

Arkansas, which temporarily banned the highly volatile weedkiller in July, could now face legal action from Monsanto, the developers of dicamba-resistant soybeans or cotton and the corresponding pesticide, aka the Xtend crop system.

Keep reading... Show less
Popular
Crews cleanup a spill from the Rover pipeline near the Tuscrawas River in southern Stark County. Ohio EPA

Ohio EPA Hikes Fines Against Rover Pipeline to $2.3 Million

The Ohio Environmental Protection Agency (EPA) asked the state attorney general's office Wednesday to hold the owners of the troubled Rover natural gas pipeline responsible for $2.3 million dollars in fines. Rover leaked more than 2 million gallons of drilling mud into protected Ohio wetlands this spring, leading the Federal Energy Regulatory Commission to order a halt to construction.

Keep reading... Show less
Sponsored
Popular
Diego Cambiaso / Flickr

White House Considers Green Rebrand

The White House convened a "big-picture" strategy meeting on climate and environment this week, Politico reported.

At the meeting, deputy-level White House officials and representatives from agencies discussed how to frame President Trump's larger environmental objectives beyond simply overturning Obama-era regulations. Per Politico, meeting attendees considered the possibility of highlighting job creation and new energy technology and "how to combat the public perception that the administration is out of touch with climate science."

Keep reading... Show less
Popular
iStock

How Trump Could Undermine the U.S. Solar Boom

By Llewelyn Hughes and Jonas Meckling

Tumbling prices for solar energy have helped stoke demand among U.S. homeowners, businesses and utilities for electricity powered by the sun. But that could soon change.

President Donald Trump—whose proposed 2018 budget would slash support for alternative energy—may get a new opportunity to undermine the solar power market by imposing duties that could increase the cost of solar power high enough to choke off the industry's growth.

Keep reading... Show less
Sponsored

mail-copy

Get EcoWatch in your inbox