Navigation Links
Status symbols of house sparrows
Date:6/4/2010

ges are worn off and the black bib is clearly visible", says Silke Laucht who performed the study. This is why the researchers took small blood samples and photographs of the breast and the bill of 150 male sparrows during moult in early autumn, in January, March at the beginning of the breeding season and in June at peak breeding season.

Testosterone influences bill colour

As the scientists had expected, testosterone levels fluctuated in the course of the year and were the highest at the beginning and during the breeding season. They were at the lowest during moulting when the animals were the most vulnerable. Also the correlation between bill colour and testosterone levels was obvious: the more testosterone in the blood at a certain time of year, the darker the bill.

Concerning the badge, the researchers made a startling discovery: at no time during the year was there a correlation between the size of the badge and blood testosterone levels. Is the badge therefore not a dominance signal? "Other studies have found correlations between badge size and age and body size of the animals", said Laucht. Thus, the badge could be a signal for dominance not exclusively related to testosterone.

The detailed study revealed another surprise: males with the highest testosterone levels during the breeding season did not have inevitably the highest levels during moult. How can ornaments that are developed during moult honestly signal their information many months later during the breeding season? For Silke Laucht and her co-authors this is a contradiction that they want to solve next.


'/>"/>

Contact: Silke Laucht
laucht@orn.mpg.de
49-081-579-32320
Max-Planck-Gesellschaft
Source:Eurekalert

Page: 1 2

Related biology news :

1. Sequella receives US and EU orphan drug status for SQ109 for the treatment of TB
2. Study identifies trends of vitamin B6 status in US population sample
3. Promptu and OAG Team to Deliver Flight Schedule and Status Information on Mobile Devices
4. U of Minnesota researcher finds link between aggression, status and sex
5. Chemistry professor 1 of only 3 at UH to achieve prestigious AAAS status
6. People of higher socioeconomic status choose better diets -- but pay more per calorie
7. Hypertension among lower-status employees lingers well into retirement
8. Alert status area in brain discoved by Hebrew University scientists
9. Ambry Genetics Announces Certified Service Provider Status for Agilent Microarrays
10. Low socioeconomic status affects cortisol levels in children over time
11. Gas improves blood flow and organ status during minimally invasive surgery
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/18/2014)... it that when people are too stressed they are ... the Brain Mind Institute (BMI) at EPFL have just ... between chronic stress and the loss of social skills ... attacks a synaptic regulatory molecule in the brain. This ... Communications . , Carmen Sandi,s team went to ...
(Date:9/18/2014)... lives nestling in the protective tentacles of host anemones, ... travel hundreds of kilometres across the open ocean. Although ... been predicted, this is the first time that the ... been observed. , Dr Steve Simpson, Senior Lecturer in ... Exeter, and colleagues from the Australian Research Council Centre ...
(Date:9/17/2014)... his doctoral student have designed a device based on ... fog and dew., The device could provide water in ... globe., Cheng Luo, professor in the Mechanical & Aerospace ... same College of Engineering department, published "Bioinspired Plate-Based Fog ... Chemical Society) Applied Materials & Interfaces ...
Breaking Biology News(10 mins):How stress tears us apart 2Expedition finds Nemo can travel great distances to connect populations 2Expedition finds Nemo can travel great distances to connect populations 3Shorebird's beak inspires UT Arlington research on water collection 2
... Drugs that target the way cells convert nutrients ... range of conditions including heart attack and stroke. ... a team led by Massachusetts General Hospital (MGH) researchers ... drug, that can shift cellular energy metabolism processes in ...
... proteins found in our intestines can recognize and kill bacteria ... at Emory University School of Medicine have discovered. The ... appear in the journal Nature Medicine . Many ... surfaces of bacteria, but these proteins are different because they ...
... 2010) The wait is over for 16-year-old Francesco "Frank" ... heart in a nine-hour transplant operation at Texas Children,s Heart ... child ever discharged from a pediatric hospital with an implanted ... pediatric patients with VADs remained in the hospital, often in ...
Cached Biology News:Shifting cellular energy metabolism may help treat cardiovascular disease 2Shifting cellular energy metabolism may help treat cardiovascular disease 3Bacteria-killing proteins cover blood type blind spot 2Bacteria-killing proteins cover blood type blind spot 3Texas Children's discharges history-making patient 2
(Date:9/18/2014)... , Sept. 18, 2014 /PRNewswire-iReach/ -- DeepResearchReports.com ... China Acetic Acid Industry" and "2014 Deep Research ... reports to its research database. Photo ... Deep Research Report on Global and China Acetic ... report on China and ...
(Date:9/18/2014)... September 18, 2014 ... http://www.researchandmarkets.com/research/czvg3s/biocompatible ) has announced the addition ... Global Strategic Business Report" report ... ,This report analyzes the worldwide markets ... by the following Product Segments: Polymeric ...
(Date:9/18/2014)... DUBLIN , Sept. 18, 2014 ... the "Global and Chinese Stem Cell Industry Report, ... Stem cells are undifferentiated biological cells that can differentiate ... produce more stem cells. Stem cell therapy can be ... of hematological system disease), nervous system diseases, damage or ...
(Date:9/18/2014)... 2014 Research and Markets has ... (Polymerase Chain Reaction, In-situ hybridization, Immunohistochemistry) Market - Trends ... The global companion diagnostics market is ... 2014 to 2019. Factors such as rising need for ... diagnostics by the pharmaceutical industry, support from regulatory authorities, ...
Breaking Biology Technology:Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 2Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 3Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 4Biocompatible Materials - Global Strategic Business Report 2014 2Biocompatible Materials - Global Strategic Business Report 2014 3Global and Chinese Stem Cell Industry Report, 2014-2017 2Global and Chinese Stem Cell Industry Report, 2014-2017 3Global Companion Diagnostics (Polymerase Chain Reaction, In-situ hybridization, Immunohistochemistry) Market - Trends & Forecasts to 2019 2Global Companion Diagnostics (Polymerase Chain Reaction, In-situ hybridization, Immunohistochemistry) Market - Trends & Forecasts to 2019 3
... 5 , - Exchange: OTCBB, Immureboost Inc. announced ... Inc., Fountain Healthy Aging Inc. said this approval follows ... Directors and the Shareholders,of the Company., CEO, Dr Tony ... a,new direction and a completely new business plan ", ...
... the first to use rapid, automated DNA sequencing to ... perform microbial ,fingerprinting, ... in the,development of state of the art genomic and informational ... Patent,and Trademark Office (USPTO) recently issued U.S. Patent no. 7,449,808, ...
... 5 /Xinhua-PRNewswire-FirstCall/ -- Huifeng Bio-,Pharmaceutical Technology, Inc (OTC ... producer of plant extracts and pharmaceutical raw,materials for ... China, is pleased to announce a Letter of ... Qinba Xintong Medical Ltd. ("Qinba").,Under the proposed terms ...
Cached Biology Technology:Immureboost Inc Announces a Change of Name to Fountain Healthy Aging Inc 2eGenomics Awarded First U.S. Patent Covering Rapid DNA Sequencing Technology Platform to Control Hospital-Acquired Infections 2eGenomics Awarded First U.S. Patent Covering Rapid DNA Sequencing Technology Platform to Control Hospital-Acquired Infections 3Huifeng Bio-Pharmaceutical (HFGB) Enters into Letter of Intent with Xi'an Qinba Xintong Medical Ltd. 2
... The StatMatic I provides a convenient and ... culture work. Used with an eight-port disposable ... not possible with multi-channel pipettes. The eight-port ... in volumes of 100, 200, 250, or ...
384 Well PCR Plate Carrier for Thermo-Sealer...
These 18x18 square No.1 Corning cover glasses are made from No. 0211 zinc titania glass and are 0.16 to 0.19mm thick....
... are hydrophobic cover slips for in ... genomic arrays on glass slides., ... Hybri-slips do not adsorb probes. , ... to use. , Avoid RNA degradation-Hybri-slips ...
Biology Products: