Navigation Links
Scientists question fisheries health test
Date:11/24/2010

A measure widely advocated as a means of assessing the health of marine ecosystems is an ineffective guide to trends in biodiversity, and more direct monitoring is needed, a new study has found. The findings published this week in Nature followed an examination of whether changes in fishery catches reflect changes in the structure of marine food webs, and therefore are a suitable guide to assess the impacts of fishing on marine ecosystem health.

CSIRO Wealth from Oceans Flagship scientist, Dr Beth Fulton, and Dr Sean Tracey from the Tasmanian Aquaculture and Fisheries Institute at the University of Tasmania, were members of the international team involved in the study.

"Biodiversity indicators are used to track the impacts of fishing as a guide to management effectiveness," Dr Fulton said.

"The most widely adopted indicator of biodiversity in the ocean at a global scale is the 'average trophic level' (position in the food chain) determined from fishery catches.

"This is intended to detect shifts from high-trophic-level predators such as Atlantic cod and tunas to low-trophic-level fish, invertebrates and plankton-feeders such as oysters." Dr Tracey said the study was the first large-scale test of whether average trophic level determined by fishery catch is a good indicator of ecosystem average trophic level, marine biodiversity and ecosystem status.

"We looked at average trophic level determined from a range of sources including global fishery catches, long-term surveys, stock assessments and complex computer modelling for marine ecosystems around the world," Dr Tracey said.

"In contrast to previous findings, which reported declines in catch average trophic level thought to be due to the loss of large fish and the increasing catch of small fish, we found that catches are increasing at most levels of marine food webs and that the average trophic level has actually increased in the past 25 years.


'/>"/>

Contact: Bryony Bennett
bryony.bennett@csiro.au
61-362-325-261
CSIRO Australia
Source:Eurekalert

Page: 1 2

Related biology news :

1. Scientists clock on to how sunlight shapes daily rhythms
2. Scientists discover genes linking puberty timing to body fat in women
3. Bacteria use toxic darts to disable each other, according to UCSB scientists
4. Scientists question indicator of fisheries health, evidence for fishing down food webs
5. Scientists learn more about how kidneys fail and how new drugs may intervene
6. Scripps Research scientists identify new mechanism regulating daily biological rhythms
7. Caltech scientists describe the delicate balance in the brain that controls fear
8. UNC scientists identify cellular communicators for cancer virus
9. Scientists discover how the songbirds brain controls timing during singing
10. Scientists pinpoint key defense against parasite infection
11. McMaster scientists turn skin into blood
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/25/2014)... tractography (DTT), which is derived from diffusion tensor ... motor tracts, such as the corticospinal tract, the ... The corticospinal tract is known to be a ... human brain. Several studies have reported on injury ... addition, some studies have demonstrated recovery of a ...
(Date:7/25/2014)... at the Stowers Institute for Medical Research ... receptors, and found pheromones crucial to triggering the mating ... receptors helps a male mouse detect pheromones that indicate ... receptors lets him know if the female mouse is ... are critical to trigger mating. Stowers, researchers believe mice ...
(Date:7/25/2014)... time, Spanish researchers have detected an unknown interaction between ... are introduced into a droplet of salt water and ... crystallisation to create biomineralogical biosaline 3D morphologically complex formations, ... bacteria are revived. The discovery was made by chance ... of the Astrobiology journal and may help ...
Breaking Biology News(10 mins):It takes two to court 2It takes two to court 3Bacteria manipulate salt to build shelters to hibernate 2
... Michigan A new internet-based tool for designing agricultural ... to optimize design by allowing rapid development of alternative ... Resource: Engineering & Technology for a Sustainable World ... Agricultural Engineering at the University of Missouri, introduces a ...
... investigation an international body of earth scientists has formally agreed ... by 800,000 years, reports the Journal of Quaternary Science ... International Commission on Stratigraphy (ICS), the authority for geological science ... declaring when the Quaternary Period, which covers both the ice ...
... , , , ... (OTC Bulletin Board: PBME), a leading provider of specialized reference ... a Loan and Security Agreement with Terry M. Giles, providing for ... connection with, and as required by the Loan, on August 31, ...
Cached Biology News:Web-based innovation improves, eases agricultural terrace design 2End of an era: New ruling decides the boundaries of Earth's history 2Pacific Biometrics Completes $4 Million Debt Financing 2Pacific Biometrics Completes $4 Million Debt Financing 3Pacific Biometrics Completes $4 Million Debt Financing 4Pacific Biometrics Completes $4 Million Debt Financing 5
(Date:7/25/2014)... According to a new market report ... Global Industry Analysis, Size, Share, Growth, Trends and Forecast, ... estimated at USD 161,056.5 million in 2014 and is ... 2014 to 2020, to reach an estimated value of ... market is witnessing a significant growth due to the ...
(Date:7/25/2014)... July 25, 2014  Galmed Pharmaceuticals Ltd. (Nasdaq: ... on the development and commercialization of a once-daily, oral ... gallstones, today announced financial results for the period ended ... Summary: , Reported cash and cash equivalents totaling ... at December 31, 2013.  , Reported a net ...
(Date:7/24/2014)... New York, NY - July 24, 2014 -- Keryx ... results from the long-term, randomized, active control Phase 3 ... ferric iron-based phosphate binder, for the treatment of hyperphosphatemia ... The PERFECTED study (PhosphatE binding and iRon delivery with ... the Journal of the American Society of Nephrology ...
(Date:7/24/2014)... 2014  Asterias Biotherapeutics, Inc. (OTCBB: ASTYV), a ... regenerative medicine, announced today that it will host ... on Tuesday, July 29, 2014, at 4:30 p.m. ... an overview of Asterias, business strategy and product ... http://www.ustream.tv/channel/asterias-biotherapeutics at least 15 minutes before the ...
Breaking Biology Technology:Biological Drugs Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 2Biological Drugs Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 3Galmed Pharmaceuticals Reports First Half 2014 Financial Results 2Galmed Pharmaceuticals Reports First Half 2014 Financial Results 3Galmed Pharmaceuticals Reports First Half 2014 Financial Results 4Galmed Pharmaceuticals Reports First Half 2014 Financial Results 5Galmed Pharmaceuticals Reports First Half 2014 Financial Results 6Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 2Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 3Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 4Asterias Biotherapeutics Announces Live Investor Webcast 2Asterias Biotherapeutics Announces Live Investor Webcast 3Asterias Biotherapeutics Announces Live Investor Webcast 4
... Sept. 7 On Thursday, October,18, 2007, Wyeth (NYSE: ... 2007,third quarter. The Company will hold a one-hour conference ... October 18, 2006. Interested,investors and others may listen to ... Internet webcast, which may be accessed by visiting our ...
... Richard Gabriel, Chief,Executive Officer of DNAPrint Genomics, ... be featured in an exclusive interview with, http://www.wallst.net ... September 10 at 11,a.m. EDT. The interview will ... p.m.,EDT on September 10. The interview will ...
... York City 5:30-7:30 p.m. (ET), SAN DIEGO, Sept. ... focused on developing products for,minimally disruptive surgical treatments for ... reception for institutional investors and,analysts at the Waldorf=Astoria Hotel ... 5:30 p.m. to 7:30 p.m. ET. The reception ...
Cached Biology Technology:WallSt.net (www.wallst.net) Announces Upcoming Interview With CEO of DNAPrint Genomics 2NuVasive to Host Investor Reception on September 11, 2007 2NuVasive to Host Investor Reception on September 11, 2007 3NuVasive to Host Investor Reception on September 11, 2007 4
... Cellular uptake of long double stranded RNA ... interference in a diverse group of organisms ... RNA interference leads to the inhibition of ... of the target messenger RNA (mRNA). Attempts ...
... Bruker Daltonics and Bruker BioSpins ... for metabolism studies, and analysis of ... ESI-TOF system, an optional Avance NMR ... acquisition, evaluation and statistical analysis for ...
... Tracker w/ OutputCumulates a score of movement counts, ... that it.can track up to 6 subjects at ... be triggered. Can outpt a sync pulse ... Can use animal location and timing information ...
... GEA Diessel fermentation systems for cultivation ... have provided manufacturers of bio-pharmaceutical products maximum ... years. For microbial and cell fermentation 10 ... of dead-leg areas ,*Fully automated control ...
Biology Products: