HOME >> BIOLOGY >> NEWS
Research Shows How Shrimps Escape Predators


Sniffing Danger -- Why A Freshwater Shrimp Has To Keep On The Move

Hunters prefer to stalk from downwind to prevent odours alerting their prey. In the same way, fish hunt from downstream. But now researchers have found that fresh-water shrimps subvert this strategy by creating tiny currents to enable them to sense the chemical odour of brown trout waiting downstream to ambush them.

Jonas Dahl, a limnologist at Lund University in Sweden, placed a set of mesh enclosures in a stream north of Lund. Half the enclosures contained brown trout and half were empty. Dahl then counted amphipod shrimps, Gammarus pulex, that drifted downstream into the enclosures.

He found that fewer of the amphipods migrated into the enclosures containing trout than into those that were empty. This suggested that the amphipods could somehow detect the trout from upstream.

With colleagues Anders Nilsson and Lars Pettersson in the university's department of ecology, Dahl placed some shrimps in an artificial stream in their laboratory. They split the stream in two with a divider and put a cage housing a brown trout into one side and an empty cage into the other. As expected, more shrimps drifted into the empty side of the stream than into the side with the trout.

The team repeated the experiment with the trout enclosed in a large glass tube. The shrimps could now see the trout, but could not smell it. This time an equal number of shrimps drifted into each side of the divider. Finally the researchers gently rubbed the trout against the upstream side of its cage, to mark the cage with its chemical odour. The shrimps still avoided this cage, even though there were no trout in it (Proceedings of the Royal Society Series B, vol 265, p 1339).

Using droplets of milk to trace flow patterns in the artificial stream, the researchers showed that live shrimps could generate a backflow extending 7 millimetres downstre
'"/>

Contact: Claire Bowles
claire.bowles@rbi.co.uk
44 171 331 2751
New Scientist
29-Jul-1998


Page: 1 2

Related biology news :

1. Researchers determine genetic cause of Timothy syndrome
2. Researchers find color sensitive atomic switch in bacteria
3. Schepens Eye Research Institute receives Roadmap grant to develop center for curing eye diseases
4. Researchers identify protein promoting vascular tumor growth
5. Researchers devise potent new tools to curb ivory poaching
6. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
7. Researchers ID chlorophyll-regulating gene
8. Environmental issues center of Inland Northwest Research Alliance 4th Annual Symposium
9. Research suggests new avenue for stopping, preventing colon cancer
10. Researchers develop fast track way to discover how cells are regulated
11. Research on carbohydrate metabolism receives historical recognition

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:12/5/2018)... ... December 05, 2018 , ... Dr. Nicolas ... symposium 2018, London, England. The 2018 PDT symposium was organized by the RSM ... its benefits in clinical practice across a range of applications in oncology and ...
(Date:12/5/2018)... (PRWEB) , ... December 04, 2018 , ... ... sciences and diagnostics companies, announces the placement of Michael Mercer at Karius, Inc. ... business strategy, Mr. Mercer will be based at Karius' headquarters in Redwood City, ...
(Date:12/5/2018)... ... 2018 , ... Biolytic Lab Performance Inc. is proud to ... Biolytic’s Molecule Synthesis Platform. , Now restructured with all the same principles ... in oligonucleotide synthesis, the 192c incorporates a multitude of enhancements to new and ...
Breaking Biology News(10 mins):
(Date:12/10/2018)... ... December 10, 2018 , ... ... and Manufacturing Organization (CDMO) with sites in China and the United States, ... aseptic fill finish solutions for monoclonal antibody (mAb) and antibody-drug conjugate (ADC) ...
(Date:11/29/2018)... ... November 29, 2018 , ... RAGS, today announced the closing of a ... with participation from existing investor and board member Jeremy Andrus, CEO of Traeger Grills, ... additional funding will enable the company to accelerate its growth and expand the product ...
(Date:11/20/2018)... ... November 19, 2018 , ... Patients with missing teeth in ... implants from Dr. Dan Myers at THE DENTIST Centers without a referral. Dr. ... restorations for the last 20 years. He now offers skilled dental care in two ...
(Date:11/13/2018)... ... November 12, 2018 , ... ... contamination that two large U.S. studies, published last week, confirm pose a significant ... of Infection Control (AJIC) conclude that stethoscopes are often improperly or rarely disinfected. ...
Breaking Biology Technology:
Cached News: