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Written by Dr. H. P. Bustami
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Sunday, 01 March 2009 |
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 Social interaction among hyenas. (Courtesy: Oliver Hoener)
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Written by Dr. H. P. Bustami
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Saturday, 14 February 2009 |
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 Sengrim and Litte Red Riding Hood - the wolf as evil and sneaky beast in European tales. (19th-century-postcard, public domain, wikimedia commons)
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Written by Dr. H. P. Bustami
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Tuesday, 02 December 2008 |
 Spiders - not everybodys darlings (photograph: T. Hesselberg) Be first to comment this article | Add as favourites (52) | Quote this article on your site | Views: 9197 | E-mail |
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Written by Dr. H. P. Bustami
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Sunday, 23 November 2008 |
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Marine biotops are still largely unexplored ecosystems and many scientific questions remain unanswered. One of the great miracles in oceans is the daily mass migration of plankton in the vertical direction towards the light. Little is known about the mechanism how these myriads of small organisms find their way to the light. Scientists from the European Molecular Biology Laboratory (Heidelberg, Germany) and from the Max-Planck-Institute of Developmental Biology (Tuebingen, Germany) now discovered how the larvae of invertebrate sea dwellers navigate towards the light. The larvae of a marine annelid (an aquatic worm) served as model organism. The larva of Platynereis dumerilii (scientic name of the annelid) has two primitive eye spots for light detection and cilia for movement. When the scientists spotted light on one of the eye spots the larva changed the frequency of its cilia and moved towards the light source. Between the eye spots and the cilia exists a direct neural connection which allows a 1 to 1 ratio between stimulus (light) and reaction (moving towards the light). The scientists suggest that the earliest eyes in evolution could have worked alike.
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Written by Thomas Hesselberg
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Sunday, 12 October 2008 |
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A new study by French scientists shows that when the ants are removed from their host in an ant-plant mutualism, the host plant suffer more damage from herbivores. They, furthermore, find that ants patrol more often on a young and vulnerable leaves, but are rapidly recruited to leaf wounds.
The so-called myrmecoophyte plants live in a close mutualism with ants. They offer the ants shelter in thorns, hollow stems or curled leaves and food in the form of extra-floral nectar or food bodies. In return the ants protects the plant by removing encroaching competitors and fungal pathogens, killing or scaring off herbivores – the ants usually have painful stings and are so aggressive that they can deter even large herbivores.
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