Nombre de vues : 0 Par Fanny Vogelweith Le Monarque (Danaus plexippus), ce superbe papillon orange et noir (figure 1), pourrait à lui seul nous faire un cours d’écologie et d’évolution. Il est notamment connu pour sa grande migration annuelle où des millions d’individus quittent le Canada, en automne, pour rejoindre les forêts de la…
By Laure-Anne Poissonnier Insect societies have long been part of the human imagination. Ants appear, for example, in fables, tales, and science fiction novels. They are often attributed to human qualities: the ant is hardworking, selfless, and well organized. It is true that when one observes an ant colony, one is forced to marvel at…
by Benoit GILLES The Order of Phasmatodea (phasms and phyllies), composed of more than 3,100 species and 500 genegenes, is one of the oldest groups of insects. They are popular for their ability to camouflage themselves in vegetation. Their morphology, sometimes displaying extravagant shapes, makes them look like twigs, leaves or bark in order to…
by Benoit GILLES The trophic chains of ecosystems such as those found in small ponds are structured in several levels. The first group consists of the so-called primary organisms, constituting phytoplankton, producing their energy from minerals and light energy through the photosynthesis process. At the base of the food chain, these organisms serve as food…
by Benoit GILLES With their presence on Earth for more than 400 million years, their diversity, their adaptability and their abundance, insects are an unprecedented biological success and an essential component to life on our planet. Today, one organism living on two and three out of four animals belong to their order. The ecological functions…
Odometer at Cataglyphis Fortis The Cataglyphis Fortis have the ability to return to the nest although they are in complete darkness. How do they estimate the distance to which the nest is located, and this in a straight line? A team of Swiss scientists led by Matthias Wittlinger (link) showed that the ant estimates the…
by Benoit GILLES In order for them to multiply, nature has endowed living organisms with a wide diversity of reproductive systems. In insects, one of these strategies is parthenogenesis. This is based on the development of individuals from unfertilized gametes, thus without the need for fertilization. This strategy is interesting for more than one reason:…
By Vincent ALBOUY Specialization/Generalism Specialization is defined as physical, biological and/or behavioural adaptation to a small group of partners. Bryona dioica (Bryona dioica), a wild Cucurbitaceae, flowers in spring in hedges and wastelands. Its greenish-white flowers attract various collectors. Among them, a small blackish bee marked with red, andrène de la bryone (Andrena florea), visits…
In the already surprisingly diverse world of ants: morphology, behaviour, adaptation and ecology (read these articles Cataglyphis ; Atta ; Eciton ; Cephalotes ; Force), is added the description of a new species to the capacity of the most singular, that of being able to be literally exploded as a means of defense ! Described…
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