Decline of Shorebird Linked to Bait Use of Horseshoe Crabs

February 12, 2009

Declining numbers of a shorebird called the red knot have been linked to
bait use of horseshoe crabs.

Long-term surveys of red knots showed that the average weight of red knots
when they leave Delaware Bay has declined significantly since their primary
food source, eggs of horseshoe crabs, has been reduced. The study also
revealed that red knot survivorship is related to departure weight, and that
the population size of red knots has declined by more than75 percent.

"We concluded that the increased harvest of horseshoe crabs led to a
reduction in the food supply for red knots at a critical period in their
annual cycle, and this led to a dramatic decline in population size," said
USGS scientist, Jon Bart, one of the authors of the study.

There is a long tradition in Delaware Bay of harvesting horseshoe crabs for
use as bait in various fisheries. In the years from 1992 to 1997, reported
harvest of crabs grew 20 fold from about 100,000 individuals harvested to
more than 2 million. This newly released study shows that this increase in
horseshoe crab harvest has led to a dramatic decrease in the number of
spawning crabs and to a 90 percent decline in crab eggs available for
shorebirds to eat.

Delaware Bay is globally recognized as an important feeding stopover for
migrating shorebirds, especially red knots. Each year, red knots migrate
from Arctic breeding grounds to the southern tip of South America and back,
covering more than 18,600 miles. In May, large numbers of red knots
congregate in the bay during their northward migration where they gorge on
horseshoe crab eggs in preparation for their continued migration to the
Arctic.

Concern over red knot populations led to restrictions in horseshoe crab
harvest starting in 1997. But as Lawrence Niles, a biologist with the
Conserve Wildlife Foundation of New Jersey and senior author of the new
study says, "Despite restrictions, the 2007 horseshoe crab harvest was still
well above that of 1990, and no recovery of knots was detectable. Recovery
of both horseshoe crabs and red knots may require more restrictions on
horseshoe crab harvest, possibly even a complete moratorium for some period.
We've proposed a program of adaptive management, including monitoring, that
should result in the information managers need to find the right balance."

Fifteen scientists participated in the study, from a wide variety of
federal, state, and nongovernmental entities. The results are published in
the February edition of the science journal Bioscience. The title of the
article is, "Effects of horseshoe crab harvest in Delaware Bay on red knots:
Are harvest restrictions working?"

This release can be found in the USGS Newsroom at:
http://www.usgs.gov/newsroom/article.asp?ID=2137.