Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Pleasing to the eye

25.06.2010
Even brooding female birds are sensitive to visual stimulation

In a breeding experiment with Houbara bustards - a North African bird species with a very distinctive courtship behaviour, scientists have concluded that visual stimulation from attractive males of the same species positively affects brooding females, improving offspring growth.

Females that observed highly displaying male birds in the experiment were more fertile and had a greater breeding success due to an increased allocation of testosterone into their eggs, leading to an increase in the growth rate in chicks. The results showed that using artificial insemination without appropriate stimulation of breeding females probably has negative impacts on their breeding performance and can therefore even affect the survival of a species, according to Adeline Loyau and Frederic Lacroix in the online edition of Proceedings of the Royal Society B.

For the experiment, Loyau of the Helmholtz Center for Environmental Research (UFZ) and the French CNRS station for experimental ecology and her colleague Lacroix (ECWP) confronted 90 brooding Houbara bustard females (Chlamydotis undulata undulata) with various individuals of the same species. In the Emirates Center for Wildlife Propagation (ECWP) in Moroccan Missour, 30 female birds were visually confronted with either highly displaying male birds, poorly displaying male birds, or females. During the experiment the female birds under investigation were artificially inseminated and kept isolated in aviaries five meters apart from birds of the same species in other aviaries. That way the scientists were able to exclude any other factors from playing a role in the experiment other than that of visual stimulation. "To my knowledge our study is the first example in species conservation of a successful manipulation of maternal allocation of resources through sensory stimulation ", explains behavioural biologist Adeline Loyau from the UFZ, "Our results show that it is possible to control maternal allocation of resources independent of the quality of male genes." Male display courtship constitutes an effective signal thereby providing conservationists with a simple and inexpensive means. The results could therefore be very significant for the improvement of captive breeding programs of other threatened bird species.

The Houbara bustard is a sandy-coloured resident of deserts, with its distribution ranging from North Africa to Mongolia. In the Arab world it is common prey for falcon hunting. Both hunting and a loss of habitat have diminished Houbara bustard populations and in the meantime the species is classified as vulnerable. It is bred in captive breeding programs to support the conservation of in-situ populations. It was for this purpose that the Emirates Center for Wildlife Propagation (ECWP) was founded in Moroccan Missour by the emir of Abu Dhabi, sheikh Zayid bin Sultan Al Nahyan.

Already in 2007, Adeline Loyau and colleagues found that females of the Blue Peacock (Pavo cristatus) that had mated with attractive males increased the allocation of resources into their eggs compared to females that had mated with unattractive males. With attractive partners they laid larger eggs and increased the yolk testosterone levels, which has a direct influence on the growth rate of offspring. Generally, it is known that various factors can have an effect on female birds and their offspring such as the quality of male genes or food availability. Under unfavourable conditions it can be more effective to invest less in the current offspring but to put more effort into the following season. With their most recent experiment Loyau and Lacroix were finally able to show that visual stimulation can also influence chick growth. The data were analysed by Loyau in the laboratories of the UFZ in Leipzig during her time there as a visiting researcher. In the meantime the French biologist is working at the station for experimental ecology (SEEM) of the French Research Center CNRS in Moulis in the Pyrenees.

The United Nations have declared 2010 as the 'International Year of Biodiversity'. The goal of this is to bring the issue of biodiversity with its many facets to the collective conscience of the public. With its expertise the UFZ contributes to investigating the consequences and causes of the loss of biodiversity as well as developing mitigation options. http://www.ufz.de/index.php?de=16034 and http://www.ufz.de/data/ufz_special_april08_biodiversity8649.pdf

Biodiversity research in Germany is conducted at numerous institutions ranging from universities, non-university research institutes and departmental research to nature conservation organisations and companies. The Network Forum on Biodiversity Research is a project in the context of DIVERSITAS Germany that intends to offer the research community a common institution-independent communication structure and culture. For more information see: http://www.biodiversity.de/

Publication:

Adeline Loyau and Frederic Lacroix (2010): Watching sexy displays improves hatching success and offspring growth through maternal allocation. Proceedings of the Royal Society B.
http://dx.doi.org/10.1098/rspb.2010.0473
http://rspb.royalsocietypublishing.org/
More information available from:
Dr. Adeline Loyau
Station d'Ecologie Experimentale du CNRS
Phone: +33 5 61 04 03 73
http://www.ecoex-moulis.cnrs.fr/Staffpages/AdelineLoyau.htm
http://www.adeline-loyau.net/
and
PD Dr. Klaus Henle
Helmholtz Centre for Environmental Research
Phone: +49-341-235-1270
http://www.ufz.de/index.php?en=1868
or
Tilo Arnhold (UFZ press office)
Phone: +49-341-235-1635
E-mail: presse@ufz.de
Links:
Emirates Center for Wildlife Propagation: http://www.ecwp.org/vo/houbara_bustard.php

International Foundation for Conservation and Development of Wildlife (IFCDW): http://houbara.com/english/

Houbara Bustard: http://en.wikipedia.org/wiki/Houbara_Bustard

Mothers invest more in reproduction when their mates are attractive (Press release from July 19th, 2007): http://www.ufz.de/index.php?en=14687

International Year of Biodiversity 2010: http://www.cbd.int/2010/welcome/

At the Helmholtz Centre for Environmental Research (UFZ), scientists research the causes and consequences of far-reaching environmental changes. They study water resources, biological diversity, the consequences of climate change and adaptation possibilities, environmental and biotechnologies, bio energy, the behaviour of chemicals in the environment and their effect on health, as well as modelling and social science issues. Their guiding research principle is supporting the sustainable use of natural resources and helping to secure these basic requirements of life over the long term in the context of global change. The UFZ employs 900 people at its sites in Leipzig, Halle and Magdeburg. It is financed by the German government and by the states of Saxony and Saxony-Anhalt. http://www.ufz.de/

The Helmholtz Association helps solve major, pressing challenges facing society, science and the economy with top scientific achievements in six research areas: Energy, Earth and Environment, Health, Key Technologies, Structure of Matter, Transport and Space. With nearly 28,000 employees in 16 research centres and an annual budget of around EUR 2.8 billion, the Helmholtz Association is Germany's largest scientific organisation. Its work follows in the tradition of the natural scientist Hermann von Helmholtz (1821-1894). http://www.helmholtz.de/

The Station d'Ecologie Experimentale in Moulis (SEEM) is a recently founded research unit of the CNRS. It is located in the foothills of the Pyrenean region of Ariege. The research focus of the station is animal dispersal and behaviour and any aspect of these. The station is well equipped comprising physiologic, genetic, and ecologic lab facilities as well as experimental sites. http://www.ecoex-moulis.cnrs.fr/

Tilo Arnhold | EurekAlert!
Further information:
http://www.ufz.de

More articles from Life Sciences:

nachricht Tag it EASI – a new method for accurate protein analysis
20.06.2018 | Max-Planck-Institut für Biochemie

nachricht How to track and trace a protein: Nanosensors monitor intracellular deliveries
19.06.2018 | Universität Basel

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Creating a new composite fuel for new-generation fast reactors

20.06.2018 | Materials Sciences

Game-changing finding pushes 3D-printing to the molecular limit

20.06.2018 | Materials Sciences

Could this material enable autonomous vehicles to come to market sooner?

20.06.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>