Menu
Modern science
Soil Microbes Accelerate Global Warming

Bold New Approach to Wind 'Farm' Design May Provide Efficiency Gains

Soft Memory Device Opens Door to New Biocompatible Electronics

Most Elliptical Galaxies Are 'Like Spirals'

New Planets Feature Young Star and Twin Neptunes

Editing the Genome: Scientists Unveil New Tools for Rewriting the Code of Life

High Social Rank Comes at a Price, Wild Baboon Study Finds

Fossil Forensics Reveals How Wasps Populated Rotting Dinosaur Eggs

Monitoring Cellular Interactions at Nano-Scale in More Detail Than Ever Before

Non-Africans Are Part Neanderthal, Genetic Research Shows

Making Blood Sucking Deadly for Mosquitoes

Rising Oceans: Too Late to Turn the Tide?

Newly Developed Fluorescent Protein Makes Internal Organs Visible

NASA's Dawn Spacecraft Returns Close-Up Image of Giant Asteroid Vesta

Bacteria Use Batman-Like Grappling Hooks to 'Slingshot' On Surfaces, Study Shows

Mysterious Fossils Provide New Clues to Insect Evolution

Twisted Tale of Our Galaxy's Ring: Strange Kink in Milky Way

Engineering Excitable Cells for Studies of Bioelectricity and Cell Therapy

Ancient Footprints Show Human-Like Walking Began Nearly 4 Million Years Ago

Memories May Skew Visual Perception

Movement of Black Holes Powers Quasars, the Universe's Brightest Lights

First Artificial Neural Network Created out of DNA: Molecular Soup Exhibits Brainlike Behavior

Dolphins' 'Remarkable' Recovery from Injury Offers Important Insights for Human Healing

Cosmological Evolution of Dark Matter Is Similar to That of Visible Matter

Exoplanet Aurora: An Out-Of-This-World Sight

Cod Resurgence in Canadian Waters
Cod and other groundfish populations off the east coast of Canada are showing signs of recovery more than 20 years after the fisheries collapsed in the early 1990s, according to research published July 27 in Nature.

"This early-stage recovery represents a long ecological transition for an ecosystem that was pushed out of balance and that is gradually moving back into balance," says William Leggett, a professor in the Department of Biology, former principal at Queen's, and an expert in the dynamics of large marine ecosystems.

This study is the first to show evidence of a recovery at the multi-species level and delve into the underlying ecological mechanisms facilitating the recovery.

The researchers hypothesize that the 20-year delay in recovery was caused by a reversal of fish predator and prey roles. When large-bodied fish like cod were dominant, they fed on smaller forage fish species. However, the overfishing of cod and other groundfish populations meant that these smaller forage fish had the opportunity to prey on large-bodied fish species in their earliest life-stages, preventing these populations from recovering their numbers.

This absence of large-bodied fish predators resulted in the forage fish population ballooning by 900 per cent and ultimately outstripping its food sources. The subsequent decline in forage fish numbers has been vital for the recovery of the cod and haddock populations.

While this recovery is positive and bodes well for other collapsed fisheries, Dr. Leggett and research colleague Jonathan Fisher are quick to note that the process is not straightforward. Cod populations are now at around 34 per cent of the level that was typical when commercial fishing was flourishing in the 1970s and 1980s. Haddock, on the other hand, now exceeds its historical levels and is playing a more dominant role.

"It's difficult to say if this switch may have any long-term implications," explains Dr. Fisher, a postdoctoral fellow in the Department of Biology. "This system may return to its historical character, but there's also the possibility that it won't and that another species will dominate. Only time will tell."

This research was conducted in collaboration with Kenneth Frank and Brian Petrie from the Bedford Institute of Oceanography and was funded by the Natural Sciences and Engineering Research Council of Canada.

Для печати

New Material Lets Electrons 'Dance' and Form New State

Cod Resurgence in Canadian Waters

Fundamental Matter-Antimatter Symmetry Confirmed

First True View of Global Erosion

NASA's WISE Finds Earth's First 'Trojan' Asteroid

Engineers Fly World's First 'Printed' Aircraft

Scientist Converts Human Skin Cells Into Functional Brain Cells

Rainforest Plant Developed 'Sonar Dish' to Attract Pollinating Bats

Sea Level Rise Less from Greenland, More from Antarctica, Than Expected During Last Interglacial

How Bats Stay On Target Despite the Clutter

Fall of the Neanderthals: Volume of Modern Humans Infiltrating Europe Cited as Critical Factor

Largest-Ever Map of Plant Protein Interactions

Some Plants Duplicate Their DNA to Overcome Adversity

best ftp client mac
free sftp mac

Menu
Diamonds Pinpoint Start of Colliding Continents

Researchers Identify Seventh and Eighth Bases of DNA

Fool's Gold Gives Scientists Priceless Insight Into Earth's Evolution

Astronomers Discover Largest and Most Distant Reservoir of Water Yet

Major Step Toward Creating Faster Electronics Using Graphene

New Photonic Crystals Have Both Electronic and Optical Properties

Epigenetic 'Memory' Key to Nature Versus Nurture

Climate Change to Increase Yellowstone Wildfires Dramatically

Retinal Cells Thoughts to Be the Same Are Not, Biologist Says

Minority Rules: Scientists Discover Tipping Point for the Spread of Ideas

Mitochondria Share an Ancestor With SAR11, a Globally Significant Marine Microbe

Drug Shown to Improve Sight for Patients With Inherited Blindness

Elliptical Galaxies Are Not Dead

Hubble Constant: A New Way to Measure the Expansion of the Universe

Enceladus Rains Water Onto Saturn

Engineers Develop One-Way Transmission System for Sound Waves

Researchers Graft Olfactory Receptors Onto Nanotubes

New Invisibility Cloak Hides Objects from Human View

Bionic Microrobot Mimics the 'Water Strider' and Walks On Water

How Memory Is Lost: Loss of Memory Due to Aging May Be Reversible

Reservoirs of Ancient Lava Shaped Earth

Wave Power Can Drive Sun's Intense Heat

Social Deficits Associated With Autism, Schizophrenia Induced in Mice With New Technology

Tundra Fires Could Accelerate Climate Warming

Chandra X-Ray Observatory Images Gas Flowing Toward Black Hole