Navigation Links
Researchers offer new theory for dogfish and skate population outburst on George's Bank
Date:2/27/2008

New research by scientists at the University of Maryland Center for Environmental Science Chesapeake Biological Laboratory questions the long-held belief that a lack of predators and competitors was the primary cause for the increase of skates and dogfish observed in Southern New Englands Georges Bank following overfishing of commercially important species in the 1980s.

In an article appearing in the journal Ecological Applications, researchers Michael Frisk, Thomas Miller, Steve Martell and Katherine Sosebee argue that the increase of winter skate on Georges Bank was the result of a migration to the area from adjacent or connected waters. This hypothesis challenges the current notion that the Georges Banks population is closed and if true, could have significant implications to management of the fishery.

Previously, scientists hypothesized that increased populations of skates and dogfish were the result of less competition from the reduced numbers of commercially important species (including cod, haddock and flounder) normally found in that area. When combined with the belief that the Georges Banks skate and dogfish populations were closed or not connected to populations in adjacent areas fisheries managers believed that declines in abundance could be offset simply by decreases in fishery harvests

If the regime shift observed on Georges Bank was driven purely by population dynamics internal to the system, then local management action has the potential to drive the system back to its former state, said Frisk. If on the other hand, skate populations in the northwest Atlantic exhibit connectivity, as suggested in our alternative hypothesis, then management of skates must be integrated across the whole northwest Atlantic. Local management actions may be insufficient to alter local abundances. Our research would argue for a broader ecosystem-based approach to fisheries management.

The concepts Frisk and colleagues put forward also place an emphasis on movement of adults rather than the drift of eggs and larvae as has been typical in research on connectivity among populations.

The research team developed their hypothesis by analyzing survey data collected by the National Marine Fisheries Service and the Canadian Department of Fisheries and Oceans. They found that as winter skate populations on Georges Bank increased, populations appeared to decrease on the Scotian Shelf, some twenty miles away.


'/>"/>

Contact: Christopher Conner
cconner@umces.edu
443-496-0095
University of Maryland Center for Environmental Science
Source:Eurekalert

Related biology news :

1. UCLA researchers solve decade-old mystery
2. Rats on islands disrupt ecosystems from land to sea, researchers find
3. Iowa State researchers help piece together the corn genomes first draft
4. U-M researchers release most detailed global study of genetic variation
5. LSU researchers challenge analyses on sustainability of Gulf fisheries
6. Researchers probe a DNA repair enzyme
7. Oregon researchers study widespread areas of low oxygen off northwest coast
8. Stanford researchers say living corals thousands of years old hold clues to past climate changes
9. Stanford researchers make first direct observation of 3-D molecule folding in real time
10. Dartmouth researchers find the root of the evolutionary emergence of vertebrates
11. Researchers decode genetics of rare photosynthetic bacterium
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/28/2017)... , March 28, 2017 ... Biometrics), Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video ... and Region - Global Forecast to 2022", published by ... in 2016 and is projected to reach USD 75.64 ... 2017 and 2022. The base year considered for the ...
(Date:3/24/2017)... The Controller General of Immigration from Maldives Mr. Mohamed Anwar ... prestigious international IAIR Award for the most innovative high security ePassport and ... ... Maldives Immigration Controller General, Mr. Mohamed ... the right) have received the IAIR award for the "Most innovative high ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by ... Global Forecast to 2022", published by MarketsandMarkets, the market is expected to be ... 2017 and 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... , ... AMRI, a global contract research, development and manufacturing ... and quality of life, will now be offering its impurity solutions as a ... requirements for all new drug products, including the finalization of ICH M7 earlier ...
(Date:10/11/2017)... Alto, CA, USA (PRWEB) , ... October 11, 2017 , ... ... set to take place on 7th and 8th June 2018 in San Francisco, CA. ... policy influencers as well as several distinguished CEOs, board directors and government officials from ...
(Date:10/11/2017)... ... October 11, 2017 , ... A new study ... in frozen and fresh in vitro fertilization (IVF) transfer cycles. The ... IVF success. , After comparing the results from the fresh and frozen transfer ...
(Date:10/10/2017)... Poway, California (PRWEB) , ... October 10, 2017 , ... ... afternoon speaking at his local San Diego Rotary Club. The event ... San Diego, CA and had 300+ attendees. Dr. Harman, DVM, MPVM was joined ...
Breaking Biology Technology: