منابع مشابه
The Royal Society
The causes of biological gigantism have received much attention, but only for individual organisms. What selection pressures might favour the evolution of gigantic societies? Here we consider the largest singlequeen insect societies, those of the Old World army ant Dorylus, single colonies of which can have 20 million workers. We propose that colony gigantism in Dorylus arises as a result of an...
متن کاملThe Royal Society
Identifying the factors that control population dynamics in migratory animals has been constrained by our inability to track individuals throughout the annual cycle. Using stable carbon isotopes, we show that the reproductive success of a long-distance migratory bird is influenced by the quality of habitat located thousands of kilometres away on tropical wintering grounds. For male American red...
متن کاملThe Royal Society
Exploiting a mutualism: parasite specialization on cultivars within the fungus-growing ant symbiosis Nicole M. Gerardo'*, Ulrich G. Mueller', Shauna L. Price' and Cameron R. Currie' 1 Section of Integrative Biology, Patterson Laboratories, University of Texas, Austin, TX 78712, USA 2 Smithsonian Tropical Research Institute, Apartado 2072, Balboa, Republic of Panama Department of Ecology and Evo...
متن کاملThe Royal Society
Bates hypothesized that some butterfly species that are palatable gain protection firom prédation by appearing similar to distasteful butterflies. When undisturbed, distasteñil butterflies fly slowly and in a straight line, and palatable Batesian mimics also adopt this nonchalant behaviour. When seized by predators, distasteñil butterflies are defended by toxic or nauseous chemicals. Lacking ch...
متن کاملMedical Section of the Asiatic Society
on former Medical Societies and Journals in Calcutta. Beginning with the Medical and Physical Society of Calcutta in 1823 which met in the Asiatic Society's rooms and published a series of volumes of Transactions, he traced the history through several short-lived attempts to found medical journals in the first half of the nineteenth century, and through the long series of Indian Annals of Medic...
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ژورنال
عنوان ژورنال: Nature
سال: 1923
ISSN: 0028-0836,1476-4687
DOI: 10.1038/112060a0