Navigation Links
Top predators and biodiversity historically pressured in Stellwagen Bank National Marine Sanctuary
Date:8/2/2010

The numbers of top-level predators in Stellwagen Bank National Marine Sanctuary, such as halibut and swordfish, have decreased significantly over what existed 100 years ago, according to a new NOAA report released today by the Office of National Marine Sanctuaries.

The National Marine Sanctuaries Conservation Series report, "Stellwagen Bank Marine Historical Ecology Final Report," describes fish populations in the sanctuary that are resilient, but have suffered declines in numbers and species diversity over time.

The report, produced by the Gulf of Maine Cod Project at the University of New Hampshire, presents results of a three-year survey and analysis of historical documents and manuscripts relevant to the marine historical ecology of the sanctuary. The authors, Stefan Claesson and Andrew Rosenberg, former director of NOAA Fisheries Northeast Regional Office, said the report's findings challenge currently established baselines "and should influence the direction of management actions needed to improve overall ecosystem integrity."

Key findings from the research include:

  • Halibut, swordfish and other top predators were overfished to near commercial extinction in the late 19th and 20th centuries;
  • Declines in diversity of bottom-dwelling species in the western Gulf of Maine, including the sanctuary, from 1900 to 2000;
  • Maximum annual catch levels of important commercial species declined by nearly 50 percent over a 100 year period; and
  • Proportional catch ratios of haddock and cod in the sanctuary have reversed in the last 100 years from 3:1 to 1:7, signaling a resurgence of cod but a precipitous decline of haddock.

"These findings present a serious wake-up call to marine resource managers, the fishing community and environmentalists," said Craig MacDonald, superintendent, Stellwagen Bank National Marine Sanctuary. "Biodiversity conservation is one of the key management priorities for the sanctuary, and a major focus in our new management plan."

According to the report, the waters of Stellwagen Bank National Marine Sanctuary have been fished for nearly 400 years, since European mariners came to the New World even before the Pilgrims. Near-shore fish populations and micro-banks, such as Stellwagen, were already showing declining numbers by the early 1800s, the report notes.

Since the late 19th century, human interactions with the Stellwagen Bank ecosystem caused dramatic changes to animal populations, according to the report's authors. They attribute the relatively quick ecosystem shifts to the development of new fishing technologies, such as gill nets and trawl gear, which were invented and adopted to improve efficiency and catch levels in an environment of declining numbers of fish caught and increasing market demand.

The report recommends additional analysis that examines historical trends for fish populations and habitat conditions back to 1800, and identifies socio-economic and cultural drivers related to shifts in catch levels.


'/>"/>

Contact: Anne Smrcina
anne.smrcina@noaa.gov
781-545-8026 x204
NOAA Headquarters
Source:Eurekalert

Related biology news :

1. Hind wings help butterflies make swift turns to evade predators, study finds
2. As super-predators, humans reshape their prey at super-natural speeds
3. Sexy or repulsive? Butterfly wings can be both to mates and predators
4. Predators ignore peculiar prey
5. Siberian jays use complex communication to mob predators
6. Venomous sea snakes play heads or tails with their predators
7. Lizards change their diet to avoid predators
8. Move over predators: Plants can control the food chain too -- from the bottom up
9. Return of top predators is key to ecological future
10. Making its predators tremble: Multiple defenses act synergistically in aspen
11. Cycad pest uses small size to hide from predators
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/13/2016)... 13, 2016  IMPOWER physicians supporting Medicaid patients in ... new clinical standard in telehealth thanks to a new ... higi platform, IMPOWER patients can routinely track key health ... mass index, and, when they opt in, share them ... to a local retail location at no cost. By ...
(Date:3/23/2016)... 23, 2016 ... Gesichts- und Stimmerkennung mit Passwörtern     ... MESG ), ein führender Anbieter digitaler ... mit SpeechPro zusammenarbeitet, um erstmals dessen Biometrietechnologie ... die Möglichkeit angeboten, im Rahmen mobiler Apps ...
(Date:3/18/2016)... 18, 2016 --> ... ICT, Manned & Unmanned Vehicles, Physical infrastructure and Perimeter Surveillance ... in the border security market and the continuing migration crisis ... Europe has led visiongain to publish this ... --> defence & security companies in the ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... ... 2016 , ... Next week on May 5 at 2:55 ... for tissue stem cell counting and expansion to gene-editing scientists and other attendees ... Genome Engineering in Burlington, Massachusetts. , The attention of most gene-editing scientists appears ...
(Date:4/27/2016)... (PRWEB) , ... April 27, 2016 , ... Cambridge ... by semantic web technology, today announced that it has been named to The Silicon ... sciences, financial services and other markets, Cambridge Semantics serves the needs of end users ...
(Date:4/27/2016)... NY (PRWEB) , ... April 27, 2016 , ... ... it. Touch screen mobile devices with fingerprint recognition for secure access, voice ... are only a few ways consumers are interacting with biometrics technology today. ...
(Date:4/27/2016)... ... April 27, 2016 , ... The Board of Directors of ... John Tilton as Chief Commercial Officer.  Mr. Tilton joined Biohaven from Alexion Pharmaceuticals, ... leaders responsible for the commercialization of multiple orphan drug indications. Mr. Tilton ...
Breaking Biology Technology: