Résultat de la recherche
20 recherche sur le mot-clé
'population dynamics' 


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I. Annan ; W. Tingey ; G. Schaefers | 1997Survivorship, growth, and reproductive performance of cowpea aphid, aphis craccivora Koch, were studied on whole plants and excised plant tissues of aphid-resistant ('ICV-12') and aphid-susceptible ('ICV-1') cultivars of cowpea, Vigna unguiculat[...]![]()
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R. Sequeira ; A. Dixon | 1997![]()
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R. Hufbauer | 2002![]()
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L. Nedorezov ; B. Nedorezova | 1995There exist two main problems in the analysis of correlation between population dynamics models with a discrete and continuous time space, which we consider at present paper. One problem is finding the discrete analog of the well-known Verhulst [...]![]()
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A model, GPA-Phenodynamics, was developed for the population dynamics and phenology of green peach aphid, Myzus persicae (Sulzer), in potato during the summer: the model describes the interaction among the green peach aphid population, its preda[...]![]()
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J. Uchmanski | 2000Using classical models of population dynamics, Lomnicki analysed the effects of different functions of resource partitioning. His main conclusion is that the monopolisation of resources ensures the highest population persistence. The objective o[...]![]()
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1. Studies of the spatio-temporal dynamics and structure of populations have identified many categories of population type. However, recognized categories intergrade, making it difficult to assign empirical population systems to single categorie[...]![]()
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M. Maudsley ; A. Mackenzie ; J. Thacker ; A. Dixon | 1996Long sequences of data on the incidence of cereal aphids from five European countries were analysed for evidence of density dependent processes occurring between years. Using a randomisation test (Pollard, Lakhani & Rotheray, 1987), density depe[...]![]()
ouvrage
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C. Ardisson ; J. Pierre ; M Plantegenest ; C. Dedryver | 1997![]()
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J. Thioulouze ; D. Debouzie ; Y. Ballanger | 1984![]()
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I. Annan ; G. Schaefers ; W. Tingey | 1996Impact of initial density of cowpea aphid Aphis craccivora Koch (Aphididae) at infestation on the growth and yield of aphid-susceptible cowpea cultivar ICV-1 and aphid-resistant cultivar ICV-12, was investigated. Plants at the seedling, flowerin[...]![]()
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M. Plantegenest ; J. Pierre ; C. Caillaud ; J. Simon ; C. Dedryver ; S. Cluzeau | 1996The development of a detailed population dynamics model to simulate changes in grain aphid (Sitobion avenae F.) populations on wheat in field conditions requires the identification of every component of the system. The present study proposes a d[...]![]()
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D. Hales ; J. Tomiuk ; K. Wohrmann ; P. Sunnucks | 1997In this paper we review recent work on aspects of aphid biology related to evolution and genetics, and suggest some directions for future research. Sections include aphid annual cycles, sexual reproduction, cytogenetics, classical genetics and m[...]![]()
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A. Watkinson ; S. Ormerod | 20011. Natural, semi-natural and artificial grasslands occur extensively around the globe, but successful management for production and biodiversity poses several dilemmas for conservationists and farmland managers. Deriving from three continents (A[...]