Staying close to mother helps baby dolphins swim

Why has the introduction of dolphin-friendly tuna-fishing methods not led to a recovery of dolphin populations? A new study shows how chase by tuna fishermen may sever the link between mother and baby dolphins, to disastrous effect.

Young dolphins keep up with their mothers, who are more powerful swimmers, by adopting the ideal position to get a 'free ride' in the mother's slipstream, according to an article published this week in the top-tier Open Access journal, Journal of Biology. Fleeing from fishing boats is likely to disrupt the positioning of mother-calf dolphin pairs, causing the younger dolphins to get permanently separated from their mothers.

Daniel Weihs, an aerospace engineer at Technion, the Israel Institute of Technology, has modeled the complex hydrodynamic interactions between two dolphin-shaped objects traveling through water. He wanted to understand the phenomenon known as 'drafting' whereby dolphin calves position themselves close to their mothers' side in an apparent attempt to reduce the forces required for swimming.

His analyses showed that the movement of water around the two dolphins generates two effects, both of which help the younger dolphin stay with its mother.

The first is similar to the slipstream effect that is well known to racing cyclists, while the second (the Bernoulli effect, which also causes aircraft to stay aloft) tends to pull the calf sideways, in towards its mother's flank. If the calf and the mother are side-by-side and almost touching, the movement of these two effects means that the calf can almost get an energetically free ride, relying on its mother's swimming efforts to carry it along.

In the ideal position the mother can provide close to 90% of the thrust needed for the young cetacean to move at around 8.5 km per hour. The author writes: "The maximum thrust is provided when the calf's center of mass is approximately at 2/3 of the mother's length. This position does not change

Contact: Gemma Bradley
BioMed Central

Page: 1 2

Related biology news :

1. Staying on the path - One atom at a time
2. Global competition closes Texas sawmills/paper mills
3. New diagnostic tool brings effective treatment closer to patients
4. Researchers one step closer to Holy Grail of neurobiology
5. Getting closer
6. Scientists close in on understanding learning and memory
7. Is Soybean Rust too close for comfort?
8. Neural stem cells take a step closer to the clinic
9. Real-time detection of pathogens in the environment: How close are we?
10. Virus researchers close in on the secret life of DNA
11. Technique brings immune-based therapies closer to reality

Post Your Comments:

(Date:3/23/2019)... Calif. (PRWEB) , ... March 22, 2019 , ... ... Preparation Kit for Next Generation Sequencing (NGS) sample preparation. RhinoSeq employs a proprietary ... NGS market. The five-tube kit is comprised of preformatted master mixes for a ...
(Date:3/18/2019)... , ... March 18, 2019 , ... Periodontal disease, where ... loss, affects nearly 50% of the US population. Making this disease particularly challenging ... biofilm state, where the cells are enmeshed in a sticky extracellular material that makes ...
(Date:3/18/2019)... ... March 18, 2019 , ... ... leader in microbial solutions announce today they have entered into an agreement for ... breakthrough product for biologic nitrogen fixation for corn. This agreement ensures an easy-to-use ...
Breaking Biology News(10 mins):
(Date:3/19/2019)... ALISO VIEJO, Calif. (PRWEB) , ... March 19, ... ... subsidiary of Konica Minolta, Inc. (Konica Minolta) today announced the formation of their ... dedicated to the advancement of precision medicine that takes into account individual variability ...
(Date:3/15/2019)... PAULO and ATLANTA (PRWEB) , ... ... ... completed the acquisition of 100% equity in American Process Inc. and affiliate ... include the Alpena Biorefinery in Alpena Michigan, the Thomaston Biorefinery and R&D ...
(Date:3/14/2019)... ... 2019 , ... Murrieta Genomics , the genomic sequencing business incubator, has ... business experience to bear as genomic sequencing startups build their business models. , “We ... that our Advisory Board brings to the table. Many of these experts would be ...
(Date:3/11/2019)... (PRWEB) , ... March 11, 2019 , ... In this ... considered to improve your clinical trial efficiency and experience. Participants will learn how to ... clinical IRT expertise to ensure that the simple or complex randomization scheme is properly ...
Breaking Biology Technology:
Cached News: