Navigation Links
Time of day tempers tadpoles' response to predators

To a tiny tadpole, life boils down to two basic missions: eat, and avoid being eaten. But there's a trade-off. The more a tadpole eats, the faster it grows big enough to transform into a frog; yet finding food requires being active, which ups the odds of becoming someone else's dinner.

Scientists have known that prey adjust their activity levels in response to predation risk, but new research by a University of Michigan graduate student shows that internal factors, such as biorhythms, temper their responses.

Michael Fraker, a doctoral student in the laboratory of ecology and evolutionary biology professor Earl Werner, will present his results Aug. 10 at a meeting of the Ecological Society of America in Memphis, Tenn.

Fraker studied tadpoles of the green frog (Rana clamitans), which normally feed more at night, to see whether their responses to predatory dragonfly larvae differed with time of day.

"Green frog tadpoles, like many other aquatic animals, assess predation risk indirectly by sensing chemicals released by their predators into the water," Fraker said. Typically, the tadpoles respond to such cues by swimming down to the bottom, seeking shelter and remaining still. In his experiments, Fraker exposed tadpoles in a tank to the chemical signatures of dragonfly larvae for one hour during the day and one hour at night. Then he recorded their swimming and feeding activity during and after exposure. Both during the day and at night, the tadpoles initially responded similarly to the chemical cues, showing the typical plunge in activity. But at night they returned to feeding more quickly than during the day.

"My interpretation of these results is that green frog tadpoles behave more conservatively in response to a predator chemical cue during the day because predation risk may still be fairly high and the tadpoles are going to feed very little anyway. That means the growth rate-to-predation risk ratio is low. At night, the
'"/>

Source:University of Michigan


Page: 1 2

Related biology news :

1. Poplar trees redirect resources in response to simulated attack
2. A comprehensive response to HIV could prevent 10 million AIDS deaths in Africa by 2020
3. Scientists solve structure of key protein in innate immune response
4. Harmful chemicals may reprogram gene response to estrogen
5. Mouse with designer liver has enhanced glucose tolerance, insulin response
6. A protein in the eye may prevent immune response and protect eyes from disease
7. Scientists at Galileo Pharmaceuticals confirm inflammatory response linked to glucose levels
8. Bacteria use hosts immune response to their competitive advantage
9. New protein vital for immune response is found in surprise location
10. NIH renews network focused on how genes influence drug responses
11. Engineered molecule amplifies bodys immune response
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Time day tempers tadpoles response predators

(Date:5/29/2015)... 28, 2015 Research and Markets ( ... "Facial Recognition Market by Solution, by Software, ... to 2020" report to their offering. ... recognition technology become more efficient and cost effective. ... and investment from the commercial sector. The development ...
(Date:5/28/2015)... 2015 Industry analyst firm n-tech Research ... titled "Markets for Self-Healing Materials: 2015-2022." According to the ... vascular systems, biomaterials, relevant shape memory materials and ... billion by 2020. The report is ... smart materials. Other recent n-tech reports have included studies ...
(Date:5/27/2015)... , May 27, 2015   Codonics ... safety systems and image documentation solutions and ... comprehensive, technologically-advanced automation solutions, is pleased to ... The Codonics® Safe Label System® (SLS), an ... conjunction with the Omnicell Anesthesia Workstation, helps ...
Breaking Biology News(10 mins):Global advanced Facial Recognition Market Expected to Grow From $2.77 Billion in 2015 to $6.19 Billion in 2020, at an Estimated CAGR of 17.4% 2The Market for Self-Healing Materials to Reach $2.7 Billion by 2020 Says New n-tech Research Study 2The Market for Self-Healing Materials to Reach $2.7 Billion by 2020 Says New n-tech Research Study 3Codonics and Omnicell Expand Partnership 2Codonics and Omnicell Expand Partnership 3Codonics and Omnicell Expand Partnership 4
... Center for Molecular Medicine (MDC) Berlin-Buch have gained new ... Michael Stilmann, Dr. Michael Hinz and Professor Claus Scheidereit ... damage within seconds, activates the transcription factor NF-kappaB, a ... program, which blocks programmed cell death. The activation of ...
... Andrews in the UK have found that the color of ... appear, and have found that diet may be crucial to ... in the December issue of Springer,s International Journal of ... of 54 Caucasian participants of both sexes were asked to ...
... While mothers have known that feeding their kids milk builds ... Institute at Intermountain Medical Center in Salt Lake City suggests ... as well and that inadequate levels of the vitamin ... and death, even among people who,ve never had heart disease. ...
Cached Biology News:How cells tolerate DNA damage -- start signal for cell survival program identified 2How cells tolerate DNA damage -- start signal for cell survival program identified 3Skin color gives clues to health 2New study links vitamin D deficiency to cardiovascular disease and death 2New study links vitamin D deficiency to cardiovascular disease and death 3
(Date:5/29/2015)... May 29, 2015 BerGenBio AS ... announces that an abstract on the latest data on ... the Axl receptor tyrosine kinase, and BGB10C9, an Axl ... been published in conjunction with the 2015 American Society ... Chicago , May 29 - June 2, 2015. ...
(Date:5/29/2015)... Los Gatos, CA (PRWEB) May 29, 2015 ... diagnostics company addressing multi-drug-resistant organisms (MDROs), announced that ... technology for same-shift bacterial detection and susceptibility testing ... asm2015 on May 31, 2015 in ... a new class of molecular diagnostics that can ...
(Date:5/29/2015)... 2015 The Academy of Model Aeronautics ... school graduates from across the nation. , The Academy ... qualified AMA Youth Members with scholarships to pursue technical ... Program has awarded nearly $900,000 to college-bound aero-modelers. The ... organizations and individuals, AMA member donations, a portion of ...
(Date:5/29/2015)... 2015 Asthma treatment could ... ersonalized   treatments enter arena, says   GBI ... erosion facing several of the leading asthma brands, such ... Xolair (omalizumab), the global market for asthma treatment is ... the decade.   New analysis from business ...
Breaking Biology Technology:BGB324 and BGB10C9 Show Promise in Models of Pancreatic Cancer 2BGB324 and BGB10C9 Show Promise in Models of Pancreatic Cancer 3Data Highlighting GeneWEAVE’s Smarticles™ Technology to be Presented at the 115th General Meeting of the American Society for Microbiology (asm2015) 2Data Highlighting GeneWEAVE’s Smarticles™ Technology to be Presented at the 115th General Meeting of the American Society for Microbiology (asm2015) 3Academy of Model Aeronautics Awards $46,500 in Scholarships to College-Bound Model Aviation Pilots 2Personalized Treatment for Severe Asthma to Drive Market Growth Despite Patent Expirations 2Personalized Treatment for Severe Asthma to Drive Market Growth Despite Patent Expirations 3
... , NEW YORK, Dec. 4 Stemline Therapeutics, Inc. ... agents, SL-401 and SL-501, in both in vitro and ... for poster presentation at the upcoming 51st Annual Meeting of the ... from December 5-8, 2009. The poster will be presented by Stemline,s ...
... , HOUSTON, Dec. 3 ... updated its facility to offer patients a second surgical option, ... that it currently performs. The first sleeve gastrectomy procedure at the ... on October 20, 2009. The patient is reported as doing ...
... , ... (OTC Bulletin Board: ACCP), today provided ... FDA approved treatment for oral mucositis, a debilitating side effect ... Access, partner, SpePharm, in six European countries, including the UK, ...
Cached Biology Technology:Stemline Therapeutics Announces Poster Presenting in vivo and Anti-Cancer Stem Cell Activity of SL-401 against Chronic Myeloid Leukemia (CML) at the 51st Annual Meeting of the American Society of Hematology (ASH) 2JourneyLite of Houston Now Offering Sleeve Gastrectomy 2Access Pharmaceuticals Provides Update on MuGard Commercial Launch in Europe 2Access Pharmaceuticals Provides Update on MuGard Commercial Launch in Europe 3Access Pharmaceuticals Provides Update on MuGard Commercial Launch in Europe 4
... LVF-CUVADPT, FHS-LVF, and the CVD-Diffuse We've ... Variable Filters to create the world's first ... and adjustable bandpass. Each filter features an ... (99.8%). These filters -- with interference ...
Agar, 500 g. Noble Agar.Moisture: < 10%, ash: < 1.6%, EEO (-mr): < 0.450 (pH 8.4). Category: Nucleotides & Enzymes & Biochemicals, Ultrapure Biochemicals ....
...
...
Biology Products: