Navigation Links
Restoring fish populations leads to tough choice for Great Lakes Gulls
Date:5/14/2008

You might think that stocking the Great Lakes with things like trout and salmon would be good for the herring gull. The birds often eat from the water, so it would be natural to assume that more fish would mean better dining. But a new report published in the April journal of Ecology by the Ecological Society of America says that the addition of species such as exotic salmon and trout to the area has not been good for the birds, demonstrating that fishery management actions can sometimes have very unexpected outcomes.

Craig Hebert (National Wildlife Research Center in Ottawa, Canada) and his team analyzed 25 years of data on the gulls and found that throughout the Great Lakes region, the birds were in poor health in many areas. Tests of their fatty acids showed an increase in the type of transfat that mostly comes from food produced by humans.

It seems that the birds are being forced to make a dietary shift from fish to terrestrial food, including garbage, says Hebert.

Although no one is certain why the birds are eating more garbage, evidence points to fish stocking. When exotic salmon and trout have been added to the waters, the birds seem to be out competed for their favorite prey of smaller fish, such as alewifes.

Herring gulls, which differ from the ring necked gulls that often populate American beaches and parking lots, are by no means endangered.

But the birds have long been used as monitors of environmental conditions on the Laurentian Great Lakes. Their eggs are collected annually and analyzed for insights into how the regions food webs are changing.

Gulls are top predators in this system. When fish are unavailable, the birds turn to land instead for their foraging. When given a choice between prey fish and garbage, the birds readily chose the fish. Thus scientists assume that they only eat garbage when the prey fish numbers are low.

Prey fish in the Lake have been declini
'/>"/>

Contact: Nadine Lymn
nadine@esa.org
202-833-8773
Ecological Society of America
Source:Eurekalert

Page: 1 2

Related biology news :

1. Window of opportunity for restoring oaks small, new study finds
2. Restoring sight, advances in fertility treatments and better visibility for pilots at FIO
3. Technique traces origins of disease genes in mixed human populations
4. The song doesnt remain the same in fragmented bird populations
5. UBC scientist invokes future generations to save tuna populations from collapse
6. Climate influence on deep sea populations
7. Fish farms drive wild salmon populations toward extinction
8. A genetic identity card for Plasmodium populations to improve control strategies
9. A study proposes a new universal rule to explain the equilibrium of plant populations
10. A study proposes a new universal rule to explain the equilibrium of plant populations
11. Concentrating on different aspects of pain leads to breakthrough in migraine genetics
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/24/2015)... NexID Biometrics LLC, whose spoof-mitigation technology boosts protection ... beginning of shipments of version 2.0 of its industry ... in Potsdam, N.Y. , is making ... here today at the Walter E. Washington Convention Center. ... boosts the accuracy rate range to 96.5 to 99.5 ...
(Date:3/23/2015)... SoundView Technology Group issues a new research update following the ... wallet. SoundView was one of the selected user groups to provide ... in multiple scenarios and outlets. Soundview shares ... both debit and credit card payments.  Soundview ... meets their plans in 2015, it would push our IV ...
(Date:3/23/2015)... 2015  In the 2014 fiscal year, irs.gov recorded ... This figure accounts for a fraction of the estimated ... Report, exceeds $11 billion globally. The polygraph has traditionally ... has occurred. Investor Mark Saint Juste along ... Paolella partnered to administer the test in a ...
Breaking Biology News(10 mins):NexID Begins Shipments Of Version 2.0 Fake-Finger-Detection Solution 2Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 2Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 3Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 4Polygraph Test Now Used to Protect Investors From Fraud 2Polygraph Test Now Used to Protect Investors From Fraud 3
... can serve as important sources of social and emotional support ... according to research published by the American Psychological Association. ... close to key people in their lives as to their ... the expense of relationships with other people, or that people ...
... technical, medical, and scholarly (STMS) business of global publisher ... increase in the number and proportion of its journal ... included in the Thomson ISI 2010 Journal Citation Reports ... from the 2009 JCR and includes 58 titles which ...
... vitamin D insufficiency and deficiency among patients with psoriatic ... observed in patients in southern or northern locations. The ... , a journal of the American College of Rheumatology ... vitamin D level. Psoriasis is a common ...
Cached Biology News:The truth about cats and dogs: Pets are good for mental health of 'everyday people' 2Wiley-Blackwell announces continued growth in impact factor journals 2Wiley-Blackwell announces continued growth in impact factor journals 3Wiley-Blackwell announces continued growth in impact factor journals 4Wiley-Blackwell announces continued growth in impact factor journals 5Vitamin D insufficiency prevalent among psoriatic arthritis suffers 2
(Date:4/24/2015)... -- Pfenex Inc. (NYSE MKT: PFNX) a clinical-stage biotechnology company ... value and difficult to manufacture proteins, today announced the ... of its common stock at a price to the ... offered, 2,610,000 are being offered by Pfenex and the ... Pfenex will not receive any proceeds from the shares ...
(Date:4/24/2015)... 24, 2015 Seoul Semiconductor announced ... various applications in the lighting market. In ... of this technology in emerging markets such as ... wide range of applications such as streetlight and ... lighting. , First launched in 2005 the Acrich ...
(Date:4/23/2015)... , April 23, 2015 /CNW/ - A new and ... award from North America,s ... Comparison won Silver in the "Sustainability, service" category ... The Brandcheck "Competitor Comparison" is a service that ... American and Global peers. This benchmarking process shows ...
(Date:4/23/2015)... April 23, 2015 WuXi PharmaTech (Cayman) Inc. ... and technology platform company serving the pharmaceutical, biotechnology and ... and the United States ... for the first quarter of 2015 after the New ... (which will be Thursday morning, May 14, 2015 Shanghai ...
Breaking Biology Technology:Pfenex Inc. Announces Pricing Of Follow-on Offering 2Acrich Technology from Seoul Semiconductor Adopted in Installations Worldwide 2WuXi PharmaTech Schedules First-Quarter 2015 Earnings Release 2WuXi PharmaTech Schedules First-Quarter 2015 Earnings Release 3
... Renovis,Inc. (Nasdaq: RNVS ), a biopharmaceutical company ... medical needs in the areas of,neurological and inflammatory diseases, ... 30, 2007. Revenue for the third quarter and ... and $8.5 million, respectively, compared to $2.2,million and $8.3 ...
... Pathwork Diagnostics, a,genomics-based diagnostics company focused on oncology, ... has initiated an,investigational study of the Pathwork(TM) Tissue ... to help determine a tumor,s origin so that,tissue-specific ... of the first,institutions in the country to evaluate ...
... Airborne Biological Threats Receives Government ... ... ICx Technologies, a developer of,advanced technology solutions for homeland and ... ambient aerosol,sensors for detection of airborne biological threats. The AirSentinel,sensors, ...
Cached Biology Technology:Renovis Reports Third Quarter 2007 Financial Results 2Renovis Reports Third Quarter 2007 Financial Results 3Renovis Reports Third Quarter 2007 Financial Results 4Renovis Reports Third Quarter 2007 Financial Results 5Renovis Reports Third Quarter 2007 Financial Results 6Renovis Reports Third Quarter 2007 Financial Results 7Renovis Reports Third Quarter 2007 Financial Results 8Virginia Commonwealth University to Study Genomics-Based Diagnostic Test: Pathwork Diagnostics' Tissue of Origin Test Designed to Aid in Determination of a Tumor's Origin 2Virginia Commonwealth University to Study Genomics-Based Diagnostic Test: Pathwork Diagnostics' Tissue of Origin Test Designed to Aid in Determination of a Tumor's Origin 3Virginia Commonwealth University to Study Genomics-Based Diagnostic Test: Pathwork Diagnostics' Tissue of Origin Test Designed to Aid in Determination of a Tumor's Origin 4ICx Awarded Department of Defense Contract for AirSentinel Monitors 2
...
... Cell Dissociation Buffers are membrane-filtered ... salts chelating agents and cell-conditioning agents ... balanced salt solution or Ca2+- ... dissociation of mammalian cells from support ...
... are membrane-filtered isotonic and enzyme-free aqueous ... cell-conditioning agents in either Ca2+- and ... Ca2+- and Mg2+-free phosphate-buffered saline ... from support substrates and each other ...
... Antibody Modification Services ,,GenScript offers ... labeling and antibody fragmentation. Labeling antibodies ... for visualization and quantitation of the ... is preferable to use only the ...
Biology Products: