Navigation Links
Decline of shorebird linked to bait use of horseshoe crabs
Date:2/17/2009

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 than 75 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?"


'/>"/>

Contact: Jon Bart
jon_bart@usgs.gov
208-426-5216
United States Geological Survey
Source:Eurekalert

Related biology news :

1. Films of Mitchell and Kenyon illuminate lefties decline in Victorian England
2. Decline in uptake of carbon emissions confirmed
3. No convincing evidence for decline in tropical forests
4. Changes in ocean conditions in Sargasso Sea potential cause for decline in eel fishery
5. NOAA reports coastal waters show decline in contaminants
6. Understanding autumn rain decline in SE Australia
7. Great Ape Trusts Wich lead author of Oryx paper on continuing orangutan population declines
8. River damming leads to dramatic decline in native fish numbers
9. In scientific first, Einstein researchers correct decline in organ function associated with old age
10. Decline in Alaskan sea otters affects bald eagles diet
11. In a last stronghold for endangered chimpanzees, survey finds drastic decline
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/30/2017)... -- Trends, opportunities and forecast in this market to ... AFIS, iris recognition, facial recognition, hand geometry, vein recognition, ... industry (government and law enforcement, commercial and retail, health ... and by region ( North America , ... , and the Rest of the World) ...
(Date:3/27/2017)... , March 27, 2017  Catholic Health ... and Management Systems Society (HIMSS) Analytics for achieving ... Adoption Model sm . In addition, CHS previously ... U.S. hospitals using an electronic medical record (EMR). ... its high level of EMR usage in an ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based ... to 2022", published by MarketsandMarkets, the market is expected to be worth USD ... 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... ... has granted orphan drug designation to SBT-100, its novel anti-STAT3 (Signal Transducer and ... of osteosarcoma. SBT-100 is able to cross the cell membrane and bind intracellular ...
(Date:10/10/2017)... 2017 International research firm Parks Associates announced today ... the TMA 2017 Annual Meeting , October 11 in ... home security market and how smart safety and security products impact the ... Parks Associates: Smart Home Devices: ... "The residential security market has experienced ...
(Date:10/9/2017)... Jupiter, FL (PRWEB) , ... October 09, 2017 , ... ... episode, scheduled to broadcast first quarter 2018. American Farmer airs Tuesdays at 8:30aET on ... Agriculture industry is faced with the challenge of how to continue to feed a ...
(Date:10/7/2017)... ... October 06, 2017 , ... ... its ProxiMeta™ Hi-C metagenome deconvolution product, featuring the first commercially available Hi-C ... software to perform Hi-C metagenome deconvolution using their own facilities, supplementing the ...
Breaking Biology Technology: