
Disappearing Common Birds Send Environmental Wake-up Call
| Source: | National Audubon Society |
| Date: | June 15, 2007 |
Science Daily —
Birdsongs that filled the childhoods of countless baby-boomers are
rarely heard wafting on today’s spring breezes….Once-familiar avian
spectacles now elude young birdwatchers…It’s not your imagination…

Evening Grosbeak. (Credit: Dave Menke / FWS)
A new analysis by the National Audubon Society reveals that
populations of some of America’s most familiar and beloved birds have
taken a nosedive over the past forty years, with some down as much as
80 percent. The dramatic declines are attributed to the loss of
grasslands, healthy forests and wetlands, and other critical habitats
from multiple environmental threats such as sprawl, energy development,
and the spread of industrialized agriculture.
The study notes
that these threats are now compounded by new and broader problems
including the escalating effects of global warming. In concert, they
paint a challenging picture for the future of many common species and
send a serious warning about our increasing toll on local habitats and
the environment itself.
“These are not rare or exotic birds we’re
talking about—these are the birds that visit our feeders and congregate
at nearby lakes and seashores and yet they are disappearing day by
day,” said Audubon Chairperson and former EPA Administrator, Carol
Browner. “Their decline tells us we have serious work to do, from
protecting local habitats to addressing the huge threats from global
warming.”
Species on Audubon’s list of 20 Common Birds in Decline
have seen their populations plummet at least 54 percent since 1967. The
following are among those hardest hit:
– Northern Bobwhite
populations are down 82 percent and have largely vanished from northern
parts of their range in Wisconsin, Michigan, New York and New England
mainly due to loss of suitable habitat to development, agricultural
expansion and plantation-style forestry practices.
– Evening
Grosbeaks that range from mountains of the west to northern portions of
the east coast show population declines of nearly 78 percent amid
increasing habitat damage and loss from logging, mining, drilling and
development.
– Northern Pintail populations in the continental
U.S. are down nearly 78 percent due to expanding agricultural activity
in their prairie pothole breeding grounds.
– Greater Scaup
populations that breed in Alaska, but winter in the Great Lakes and
along Atlantic to Pacific Coasts are being hard hit by global warming
induced melting of permafrost and invasion of formerly-southern
species; populations are down approximately 75 percent.
–
Eastern Meadowlarks, down 71 percent, are declining as grasslands are
lost to industrialized agricultural practices. Increased demand for
biofuel crops threatens increased agricultural use of lands that are
currently protected, making both Eastern and Western Meadowlarks even
more vulnerable.
– Common Terns, which nest on islands and
forage for fish near ocean coasts, lakes and rivers, are vulnerable to
development, pollution and sea level rise from global warming.
Populations in unmanaged colonies have dropped as much as 70 percent,
making the species’ outlook increasingly dependent on targeted
conservation efforts.
– Snow Buntings, which breed in Alaska and
northern Canada, are suffering from the loss of fragile tundra habitat
as global warming alters and disrupts the Arctic’s delicate ecological
balance; populations are down 64 percent.
– Rufous Hummingbird
populations have declined 58 percent as a result of the loss of forest
habitat to logging and development, in both their breeding range in the
Pacific Northwest and their wintering sites in Mexico.
–
Whip-poor-wills, down 57 percent, are vulnerable to fragmentation and
alteration of their forest habitat from development and poor forest
management practices.
– Little Blue Herons now number 150,000 in
the U.S. and 110,000 in Mexico, down 54 percent in the U.S. Their
decline is driven by wetland loss from development and degradation of
water quality, which limits their food supply.
Overall,
agricultural and development pressures have driven grassland birds to
some of the worst declines, followed closely by shrub, wetland and
forest-dependent species. “Direct habitat loss continues to be a
leading cause for concern,” said Audubon Bird Conservation Director and
analysis author, Greg Butcher, PhD. “But now we’re seeing the added
impact of large-scale environmental problems and policies.”
Butcher
notes that global warming is damaging some key habitats and speeding
the spread of invasive species that spur further declines. Mounting
demand for corn-based fuels is expected to result in increased use of
marginal farmland that currently serves as important habitat. The fate
of species such as Eastern Meadowlarks and Loggerhead Shrikes could
hinge on efforts to conserve these areas. “People who care about the
birds and about human quality of life need to get involved in habitat
protection at home, in pushing for better state and national
protections and in making changes in their daily routines,” Butcher
adds.
Public response will shape the long-term outlook for the
listed species. Unlike WatchList birds, these Common Birds in Decline
are not in immediate danger of extinction, despite global populations
as low as 500,000 for some species – the threshold for a “common bird”
designation. But even birds with significantly higher overall
populations are experiencing sharp declines, and with their populations
down sharply, their ecological roles are going unfilled and their
ultimate fate is uncertain. Audubon leaders hope the multiple threats
to the birds people know will prompt individuals to take multiple
actions, both locally and directed toward state and national policies.
Audubon's
Common Birds in Decline list stems from the first-ever analysis
combining annual sighting data from Audubon's century-old Christmas
Bird Count program with results of the annual Breeding Bird Survey
conducted by the U.S. Geological Survey. “This is a powerful example of
how tens of thousands of volunteer birders, pooling their observations,
can make an enormous difference for the creatures they care the most
about,” said noted natural history writer Scott Weidensaul. “Thanks to
their efforts, we have the information. Now all of us – from birders to
policy makers – need to take action to keep these species from
declining even further.”
“Fortunately, people’s actions can still
make a difference,” Audubon’s Greg Butcher adds. “Average citizens can
change the fate of these birds just as average citizens helped us
confirm the trouble they face.”
Keeping Common Birds Common: What Individuals Can Do to Help
Protect Local Habitat
Join
local Audubon Chapters and other groups to protect and restore habitats
close to home. Audubon’s Important Bird Areas program offers
opportunities to save critical bird habitat, from small land parcels to
broad ecosystems.
Promote Sound Agricultural Policy
This
has enormous impact on grassland birds and habitat, including Northern
Bobwhites and Eastern Meadowlarks. Promoting strong conservation
provisions in the federal Farm Bill and Conservation Reserve Program
can help to protect millions of acres of vital habitat.
Support Sustainable Forests
The
Boreal Forest in the Northern U.S. and Canada is essential breeding
territory for many species of birds, including Evening Grosbeaks.
Federal and state legislations promoting sustainable forest management
will help fight habitat loss from inappropriate logging, mining, and
drilling.
Protect Wetlands
Support for local, state and federal wetlands conservation programs is essential to protect a wide array of species.
Fight Global Warming
The
decline of common birds is just one impact of global warming’s mounting
threat to people and wildlife around the world. Individual energy
conservation along with strong federal, state, and local legislation to
cap greenhouse emissions can help to curb its worst consequences.
Combat Invasive Species
Invasive
non-native species disrupt the delicate ecological balance that
sustains birds and other wildlife. Federal, regional, state, and local
regulations are needed to combat this growing environmental threat.
Note: This story has been adapted from a news release issued by National Audubon Society.

