Navigation Links
Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply

e sharks have been fished in recent decades to meet the growing worldwide demand for shark fins and meat."

Sharks are targeted in numerous fisheries, and they also are snagged as bycatch in fisheries targeting tunas and swordfish in both U.S. and high seas fisheries. As many as 73 million sharks are killed worldwide each year for the finning trade, and the number is escalating rapidly.

Ecologists have long predicted that the demise of top predators could trigger destructive consequences. Researching such effects, however, has been a challenge.

"This is the first published field experiment to demonstrate that the loss of sharks is cascading through ocean ecosystems and inflicting collateral damage on food fisheries such as scallops," says Ellen Pikitch, a professor at the University of Miami Rosenstiel School of Marine and Atmospheric Science and executive director of the Pew Institute for Ocean Science. "These unforeseen and devastating impacts underscore the need to take a more holistic ecosystem-based approach to fisheries management."

As great shark populations plummeted, their elasmobranch prey—rays, skates, and smaller sharks—increased considerably, according to research surveys looking at the past 16 to 35 years. Cownose rays are most conspicuous among the 12 species showing increases because of their near-shore migrations. With an average population increase of about eight percent per year, the east coast cownose ray population may now number as many as 40 million. The rays, which can grow to be more than four feet across, eat large quantities of bivalves, including bay scallops, oysters, soft-shell and hard clams, in the bays and estuaries they frequent during summer and migrate through during fall and spring.

In the early 1980s when Peterson sampled bay scallops in North Carolina sounds in late summer before and after the cownose rays passed through, he found that most scallops survived the ray preda
'"/>

Source:University of Miami Rosenstiel School of Marine & Atmospheric Science


Page: 1 2 3 4

Related biology news :

1. Overfishing may drive endangered seabird to rely upon lower quality food
2. Overfishing in inland waters reduces biodiversity and threatens health
3. Scientists discover unique microbe in Californias largest lake
4. Worlds largest rainforest drying experiment completes first phase
5. NASA study finds snow melt causes large ocean plant blooms
6. New project aims to make large-scale lobster farms feasible
7. Butterfly migration could be largest known
8. Amazon symposium to address large-scale conservation
9. Inhaling large amounts of salt can cause hypertension
10. Size matters: Preventing large mammal extinction
11. Carnegie Mellon University research reveals how cells process large genes
Post Your Comments:
(Date:4/17/2015)... 17, 2015 Increasing ... technological advancement to drive biometric systems market in ...   According to a recently released ... &  Opportunities, 2020 ", biometric systems market in ... growth at CAGR of over 22% through 2020. ...
(Date:4/10/2015)... -- Research and Markets ( http://www.researchandmarkets.com/research/cjk4gb/security ) ... Profiles - NEC" report to their offering. ... continue to supply a range of IT security management ... focus on the development of a Big Data and ... the Asia-Pacific region is a ...
(Date:4/2/2015)... -- At its 2015 ACMG Annual Clinical Genetics Meeting ... American College of Medical Genetics and Genomics (ACMG) announced ... Members of the ACMG Board of Directors serve as ... its policies and programs. ACMG is the national organization ... eventful time in medical genetics and genomics.  We are ...
Breaking Biology News(10 mins):Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 2Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 3NEC Security Competitive Profile 2015 2American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 2American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 3American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 4American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 5American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 6American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 7American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 8
... Ind. - A new, high-resolution, interactive map of U.S. ... the emissions aren,t all where we thought. "For ... northeastern United States, and it,s looking like the southeastern ... estimated previously," says Kevin Gurney, an assistant professor of ...
... Yale Universitys Scott A. Strobel, Professor of Molecular ... Schering-Plough Research Institute Award. The award is ... Biology to recognize outstanding scientific contributions made by ... will give the award lecture, titled Three Views ...
... chemical communicator, carrying impulses from neurons to skeletal ... system. Now researchers at the University of Illinois ... component of the relay system that allows acetylcholine ... appear in the current issue of Nature Structure ...
Cached Biology News:'Revolutionary' CO2 maps zoom in on greenhouse gas sources 2'Revolutionary' CO2 maps zoom in on greenhouse gas sources 3'Revolutionary' CO2 maps zoom in on greenhouse gas sources 4'Revolutionary' CO2 maps zoom in on greenhouse gas sources 5Yale University's Strobel recognized for work on RNA 2Researchers 'see' structure of open nicotinic acetylcholine ion channels 2Researchers 'see' structure of open nicotinic acetylcholine ion channels 3
(Date:5/4/2015)... BOSTON , May 4, 2015 ... development of novel therapies for neurological and neuropsychiatric ... has initiated dosing of Alzheimer,s patients in a ... candidate, GC021109, a compound developed as a potential ... disease is innovative in that it both promotes ...
(Date:5/4/2015)... 4, 2015  RegeneRx Biopharmaceuticals, Inc. (OTCQB: RGRX) ... independent team of researchers from South ... (TB4) plays an important role in accelerating the ... an experimental mouse model, by promoting blood vessel ... dermal tissue.  The research found that the underlying ...
(Date:5/4/2015)... - New Massive Open Online Course (MOOC) ... United States Medical Licensing Examination Elsevier ... information products and services, announced today that it has ... to help medical students prepare for the United States ... most daunting of the three exams medical students must ...
(Date:5/1/2015)... 2015  Northwest Biotherapeutics (NASDAQ: NWBO ) ("NW ... therapies for solid tumor cancers, announced today that the ... of a $40 million investment from Woodford investment funds ... $25 million in NW Bio on November 19, 2014.  ... with the Company for a further $40 million investment ...
Breaking Biology Technology:GliaCure Initiates Phase 1b Dosing in Alzheimer's Patients 2Researchers Report that Thymosin B4 has a Major Role in Dermal Burn Wound Healing 2Researchers Report that Thymosin B4 has a Major Role in Dermal Burn Wound Healing 3Elsevier's Free MOOC Prepares Med Students for Licensing Exam 2Elsevier's Free MOOC Prepares Med Students for Licensing Exam 3NW Bio Closes On $28.5 Million Second Tranche Of Woodford $40 Million Financing 2NW Bio Closes On $28.5 Million Second Tranche Of Woodford $40 Million Financing 3
... , Sylviane Komesli, Martine Page, and ... Laboratoires Fournier S.A., France , ... and type II receptors form ligand dependent heteromeric signaling complexes, in which ... primary receptor. In the present study, we investigated the feasibility of using ...
... , ... radiometric screening assays. The Wallac MicroBeta effectively measures both plate types. , ... one above the sample and one below. , ... are conducted with the upper PM tube only. A comparison is made ...
... Heidi Grecsek , ... 710 Bridgeport Avenue , ... , The Clean Air Act amendments of 1990 ... content. Oxygenated fuel is desirable because it burns more completely, thereby reducing tailpipe emissions. ...
Cached Biology Technology:Use of FlashPlate Technology for In Vitro Measurement of 125I-Labeled TGF-1 Binding on Chimeric Extracellular Domain of Type II Transforming Growth Factor Receptor 2Use of FlashPlate Technology for In Vitro Measurement of 125I-Labeled TGF-1 Binding on Chimeric Extracellular Domain of Type II Transforming Growth Factor Receptor 3Use of FlashPlate Technology for In Vitro Measurement of 125I-Labeled TGF-1 Binding on Chimeric Extracellular Domain of Type II Transforming Growth Factor Receptor 4Use of FlashPlate Technology for In Vitro Measurement of 125I-Labeled TGF-1 Binding on Chimeric Extracellular Domain of Type II Transforming Growth Factor Receptor 5Use of FlashPlate Technology for In Vitro Measurement of 125I-Labeled TGF-1 Binding on Chimeric Extracellular Domain of Type II Transforming Growth Factor Receptor 6Use of FlashPlate Technology for In Vitro Measurement of 125I-Labeled TGF-1 Binding on Chimeric Extracellular Domain of Type II Transforming Growth Factor Receptor 7Counting FlashPlates on the Wallac MicroBeta 2Counting FlashPlates on the Wallac MicroBeta 3Analysis of Fuel Oxygenates by U.S. EPA Method 8260B Using Headspace Trap with GC/MS 2Analysis of Fuel Oxygenates by U.S. EPA Method 8260B Using Headspace Trap with GC/MS 3Analysis of Fuel Oxygenates by U.S. EPA Method 8260B Using Headspace Trap with GC/MS 4
...
...
Experion HighSens chips are the microfluidic chips used to perform high-sensitivity RNA analysis (picogram levels) with the Experion automated electrophoresis system. Each chip has the capacity to ru...
... Activator of Caspase/DIABLO Liquid. In 100 ... FREEZE/THAW CYCLES. Amino acid residues 56 - 239 ... ® sequence was expressed in and purified ... along with cytochrome c during apoptosis ...
Biology Products: