[Pollinator] The Scenic Route: Roadsides Provide Critical Habitat For Pollinators

[Matthew Shepherd]

FROM: Wildflower Magazine, published by the Lady Bird Johnson Wildflower
Center

https://www.wildflower.org/feature/?id=163



(The text is pasted in below. If you want to see the original, including
some lovely photos, click on the URL above!)


The Scenic Route: Roadsides Provide Critical Habitat For Pollinators Written
by Bibi Wein



The alarming loss of habitat over the past two decades has left untold
millions of bees, butterflies and other wild pollinators hungry and
homeless. The small creatures on which we depend for a significant portion
of our food supply have hardly been without their champions; public support
for monarch butterflies alone has been estimated in the billions of
dollars. Still, the pollinator prognosis remained dire. But over the past
18 months, support for pollinators has undergone a seismic shift, led by
President Obama, who called for a national Pollinator Task Force in the
spring of 2014. Less than a year later, in a book-length "Strategy to
Protect the Health of Honey Bees and Other Pollinators," the federal
government set ambitious goals that include the restoration or enhancement
of 7 million acres of land for pollinator habitat over the next five years.
Roadsides will comprise a significant portion of that acreage.



"It's historic," says Scott Black, executive director of the Xerces Society
for Invertebrate Conservation. "Two decades ago, we could have fit all the
people who were interested in this topic in my dining room. It's incredible
that the President has become involved. It's a major advance in pollinator
conservation."



Why are roadsides so important? Because they offer the space to support the
wide variety of the wildflowers and other native plants essential to
pollinator survival – as anyone can observe on a summer stroll along a
quiet country lane. But many people would be surprised to learn how vast
our roadside acreage really is.



"Roadsides form one of the most extensive linear habitats on earth," says
Jennifer Hopwood, a senior pollinator conservation specialist with the
Xerces Society. Federal or state highway agencies manage more than 17
million acres of roadside lands – not counting the thousands of miles of
additional roadways maintained by our national parks and forests. In many
areas, due largely to development and agricultural practices, pollinators
have nowhere else to go.



"Roadsides that pass through urban areas and intensely farmed landscapes
often provide the only natural or semi-natural habitat in the vicinity,"
Hopwood adds.



For the most part, this is public land, often ignored or abused, that, with
caring management, can help our beleaguered pollinators begin to thrive
once more. Many factors, some yet to be identified, have contributed to the
collapse of wild pollinator populations. But an overarching cause is loss
of safe habitat – something roadsides don't always currently provide, even
in the remote countryside. Safe habitat is pesticide and herbicide-free. It
includes not only the plants that provide nectar (carbs) and pollen
(protein) but also host plants for reproduction, rest stops for migrators
and nesting areas for full-time residents, like the ground-nesting bees
that often settle in the sunny bare patches between clumps of native
grasses. Take away the plants and the pollinators are done for. This is
what's happening at an alarming rate due to development, new agricultural
norms and roadside management policies that favor a crew-cut landscape.



"We are losing grasslands at the rate of 5 percent a year," says Hopwood.
"That's comparable to the rate of deforestation in South America." Every
minute, 4 acres of open space is lost to development in the U.S. In this
environment of scarcity, roadsides managed as pollinator habitat can be a
huge part of the solution – especially for key declining species like
bumblebees and monarch butterflies.



Roadside pollinator communities can be quite diverse, including
"generalists" (like bumblebees) that forage on a wide variety of flowers,
as well as "specialist" species like the monarch butterfly, which lays its
eggs only on milkweed. Once abundant on roadsides, milkweed has been
disappearing – most significantly along the monarch's major flyway in the
agricultural heart of the country, where it once flourished in fallow
fields, between crop rows and along every roadside. "Today fallow fields
are quickly disappearing, and crops are planted road to road," says Karen
H. Clary, Ph.D., conservation program manager at the Wildflower Center.
Clary is part of a public/private team working to bring back native
milkweeds around the Minnesota-to-Mexico l-35 corridor. The disappearance
of milkweeds has corresponded with the precipitous drop in the monarch
population that has put the iconic butterfly on a federal watch list.


Roadside Plants Help Keep Ecosystems Intact



Bumblebees, increasingly regarded as vital to our food supply, also help
sustain ecosystems in which many animal species forage through their
pollination of wildflowers. But insects aren't the only pollinators we rely
on. In parts of the Southwest, agaves and certain cactuses pollinated by
nectar-eating bats are the primary vegetation, essentially holding the
regional ecosystem together. But as these plants are harvested in growing
quantities for use in mescal and tequila, they're becoming scarce in many
areas, and their presence on roadsides is increasingly important.



A wide range of roadside plants aid migrators like monarchs and
hummingbirds by providing stopovers for a sip of nectar and a rest between
fragmented habitats. Many hummingbird species make migratory journeys that
equal or exceed the monarch's annual 2,000 to 3,000 miles. For sustenance
along the way, they've depended on nectar corridors, established over such
long periods of time that they've developed a mutualistic association with
the plants they feed on. At least 129 native plant species are known to be
pollinated by 11 different hummingbird species in western North America.
Appropriately managed roadsides can help keep these plants growing and
sustain their pollinators, all of which are threatened to varying degrees.


What We Need To Do And Stop Doing



"One of the key considerations is the presence of native plants," says
Hopwood, who is part of the Xerces Society team working with environmental
consulting company ICF International (under contract with the Federal
Highway Administration) to establish best management practices for
roadsides.



A variety of native plants, blooming from spring through fall, are vital
both in terms of number of pollinator species the habitat will support and
ease and cost of maintenance – two primary concerns of the highway managers
who will implement the guidelines.



But it's not simply about planting "the right" flowers. "Everyone
immediately goes to the idea that we need to plant more plants. First, we
need to look at our existing resources and how we can manage and use them,"
says Black.



One might well ask why roadsides with existing native habitat can't simply
be left alone. And in some places, reducing or adjusting mowing schedules
is all that's needed to restore a pollinator-friendly roadside. "When
states like Texas start looking at their roadsides, they see they have a
lot of good habitat already in place," adds Black.



Black's one complaint about the government's report is its position on
pesticides, which essentially just calls for more study. "Study after study
has shown that certain products are highly toxic to pollinators and that
they are systemic and persistent, with an ecosystem effect," he says,
leading a chorus of well informed voices in asserting that the Strategy
should have included decisive action by the EPA.



Obviously, departments of transportation that manage roadsides on federal,
state and regional levels have their own mission. The Xerces Society
believes that pollinator support and roadside management goals can be quite
compatible. Cost is often cited as a disadvantage of planting or restoring
native habitat, but studies have shown that though the initial cost of
native vegetation may be higher than planting turf, for example, native
plantings can save money over time in a number of ways.


Why Natives Are Best



One advantage locally native plants have over introduced species (and other
natives outside of their traditional range) is experience. "They've evolved
through enough droughts over time that they're really good at finding
sources of water and nutrients in that particular environment and using it
efficiently," Hopwood explains. "By enabling water to infiltrate much more
deeply into the plant's system, they can reduce runoff," she adds.
Accustomed to competing with the local weeds, they're more likely to resist
invasion from noxious species. (One example: A Wildflower Center study
showed that overseeding with native *Gaillardia pulchella
<https://www.wildflower.org/plants/result.php?id_plant=GAPU>* reduces
invasion by introduced bastard cabbage).



All of this means less time, money and energy for transportation
departments. But there are challenges in persuading some roadside managers
to see it that way. "The classic roadside maintenance idea is turf: neat
grass, rather than messy wildflowers," says Hopwood. "Particularly in urban
areas it's more acceptable to have highways maintained as turf." Even the
word "wildflowers" can be a problem. Bonnie Harper-Lore, one of the first
administrators to bring an ecological approach to roadsides, discovered
this in the 1980s.



"I think we made a mistake by using the term 'wildflowers' because it
evoked a negative response among engineers, who were the decision makers,"
recalls Harper-Lore, who recently retired from the Federal Highway
Administration, where she directed the vegetation management program.
"Wildflowers evoked something superfluous. The maintenance districts
regarded 'wildflowers' as something weedy and uncontrollable.



Even Mrs. Johnson commented some years later that we should have used a
different word. I ultimately wished I had introduced the use of native
grasses first and then slowly injected native wildflowers or forbs…it would
have been an easier sell."



One of the hardest sells, and one of the most important, is getting state
and regional roadside managers to consider reducing or changing mowing
regimens that can quickly turn rich habitat into wasteland – at least from
a pollinator's point of view.



"Both the time of year and the frequency of mowing have ecological
consequences," says Hopwood. "Mowing once a year in late autumn when
pollinators are not flying, or mowing every few years, would have the least
impact." When mowing is done after plants have gone to seed, they'll reseed
themselves, saving on maintenance costs. And clearly, less frequent mowing
is a budget booster.



But, not inappropriately, transportation departments see driver safety as
their first priority and say their mowing regimens are based on improving
driver sightlines, providing a shoulder, preventing woody vegetation from
encroaching and reducing collisions with deer. But Hopwood counters,
"Mowing a narrower strip can meet these objectives and leave plenty of
habitat."



Limited studies have failed to show that vegetation taller than turf
increases deer-related collisions. Also, as Harper-Lore has pointed out,
deer prefer tender new growth; more mature (less frequently mowed)
vegetation would be tougher and therefore less appealing to browsers.



While some transportation departments such as Florida's have cooperated
with – and even initiated – pollinator-friendly policies, others remain
intransigent about sticking with what's familiar. However, Xerces Society
staff have been encouraged by highway personnel who are excited by the
opportunity to be part of a significant conservation effort. "The people on
the ground are going to drive change," says Black. "They will lead by
example. Many highway agencies are trying to step up. The government
Strategy is going to help; it already has. As managers implement these
guidelines, the next county will see it and see that it can be done within
their budget.

It will radiate out. Our job is to empower those who want to do the right
thing by giving them the tools to do it." departments do and don't do. Safe
habitat must, first and foremost, be pesticide- and herbicide-free.
Numerous conservation groups, including the Wildflower Center, the Xerces
Society, Friends of the Earth and the Center for Biological Diversity,
assert that bees and other pollinators are poisoned routinely by widely
used pesticides already banned in Europe. In agricultural areas, herbicides
have destroyed host plants such as milkweeds by the millions.



Black points out that in most places where glyphosates (the most common
class of herbicide) are used, they’re used on crops that have been
genetically modified to be resistant to the herbicide. “This must be
addressed,” he says. "We also need to look over the fence. If a landowner
next door is using pesticides, the flowers may look beautiful, but the
insects we’re trying to protect will be dead.” In some places, the Xerces
Society has found, roadsides are actually being managed not by
transportation personnel but by adjacent landowners. "They've got the mower
out, so they just go ahead and mow, thinking they're helping their highway
people," says Black. "Education is the key, across the board."



Lady Bird Johnson once said she wanted the roadsides of Texas to look like
Texas, and Vermont to look like Vermont, and so on. Those close to the
first lady know she understood that the benefits of native roadsides didn't
end with their distinctive regional beauty and that they were vital to the
creatures they support. Ironically, today, as we struggle to better
understand and meet their needs, the pollinators are helping to drive the
realization of her dream.



*Bibi Wein authored the award-winning memoir "The Way Home: A Wilderness
Odyssey" (Tupelo Press). She lives in New York, and her work has appeared
in numerous magazines and literary journals.*
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