Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Researchers offer new theory for dogfish and skate population outburst on George's Bank

29.02.2008
Hypothesis suggests movement toward ecosystem-based fisheries management

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 England’s George’s Bank following overfishing of commercially important species in the 1980’s.

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 George’s Bank was the result of a migration to the area from adjacent – or connected – waters. This hypothesis challenges the current notion that the Georges Bank’s 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.

Christopher Conner | EurekAlert!
Further information:
http://www.umces.edu

More articles from Ecology, The Environment and Conservation:

nachricht Global threat to primates concerns us all
19.01.2017 | Deutsches Primatenzentrum GmbH - Leibniz-Institut für Primatenforschung

nachricht Reducing household waste with less energy
18.01.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>