Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Overfishing puts Southern California kelp forest ecosystems at risk, report scientists

29.05.2006


Kelp forest ecosystems that span the West Coast –– from Alaska to Mexico’s Baja Peninsula –– are at greater risk from overfishing than from the effects of run-off from fertilizers or sewage on the shore, say scientists at the University of California, Santa Barbara. The findings have important implications for the design of California’s Marine Protected Areas.


A California kelp forest creates a cathedral effect as the sun shines through the blades of the kelp. Credit: NOAA



In an article published in the May 26 issue of Science, scientists describe the first study to compare the top-down versus bottom-up human influences on the food chain of the kelp forest ecosystems.

The study was conducted by scientists at UCSB’s National Center for Ecological Analysis and Synthesis, known as NCEAS, which is funded by the National Science Foundation.


"This study shows that California is on the right track by limiting fishing in certain areas in an effort to comply with the Marine Life Protection Act," said first author Ben Halpern, project director at NCEAS.

Kelp are giant algae that reach up to 120 feet in height and support diverse ecosytems. They provide beautiful settings for scuba diving and are rich areas for commercial and recreational fishing.

The research team took data from four years of marine life surveys by the National Park Service. The park service regularly checks 16 different kelp forest sites around the Channel Islands off the coast of Central California. They maintain data on 46 different species.

Next, the scientists matched the park service data to data provided by SeaWiFs, a satellite monitoring project that photographs and analyzes ocean color for information about ocean life. This information can then be used to estimate nutrient levels in the ocean.

Organic coastal run-off –– from fertilizers and sewage overflow –– increases the amount of organic material in the near shore ocean. According to the study, differences in the amount of organic material do not have much effect on the delicate food chain of the kelp forest ecosystem. However removal of the fish at the top of the food chain has a profound effect.

When the predator species, such as rockfish, at the top of the food chain are removed, then the species that they normally eat, such as snails and barnacles, begin to increase in number. Many of these are herbivores that eat kelp. When their numbers increase, they decrease the amount of kelp, in turn changing how kelp forests look and the type of species that are associated with the kelp forest.

"Kelp forests are so sensitive," said Halpern. "If you remove some of the predators, then you can have an effect on the entire kelp forest ecosystem."

He explained that until now studies of kelp forests looked at either overfishing or increased nutrients. This is the first study to put both variables together to see which is more important.

Gail Gallessich | EurekAlert!
Further information:
http://www.ia.ucsb.edu

More articles from Ecology, The Environment and Conservation:

nachricht Bioinvasion on the rise
15.02.2017 | Universität Konstanz

nachricht Litter Levels in the Depths of the Arctic are On the Rise
10.02.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

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: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Biocompatible 3-D tracking system has potential to improve robot-assisted surgery

17.02.2017 | Medical Engineering

Real-time MRI analysis powered by supercomputers

17.02.2017 | Medical Engineering

Antibiotic effective against drug-resistant bacteria in pediatric skin infections

17.02.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>