Intraspecific Competition
Mostrando 25-36 de 40 artigos, teses e dissertações.
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25. Mathematical modeling and computational simulation of the presence of toxic impactant materials in cases of populational dynamics with inter-and intra-specific competition / Modelagem matematica e simulação computacional da presença de materiais impactantes toxicos em casos de dinamica populacional com competição inter e intra-especifica
A proposta deste trabalho é criar um modelo para descrever computacionalmente o convívio entre duas espécies competidoras com características de migração na presença de um material impactante tóxico. As equações a serem utilizadas deverão incluir os fenômenos de dispersão populacional, processos migratórios, dinâmicas populacionais densidade-d
Publicado em: 2005
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26. Effects of intraspecific competition and food deprivation on the immature phase of Ascia monuste orseis (Lepidoptera, Pieridae)
The effect of intraspecific competition for food on larvae and of food deprivation for 24 h on 2nd and 4th instars of Ascia monuste orseis (Godart, 1819) was investigated. Intraspecific competition for food during the immature phase leads to long pupation time, high larval mortality, reduced adult weight, and reduced number of eggs per female. In food depriv
Iheringia. Série Zoologia. Publicado em: 31/03/2002
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27. Tiller size/population density in grazed swards of Cynodon spp. / Compensação tamanho/densidade populacional de perfilhos em pastagens de Cynodon spp.
The experiment was conducted at the Department of Animal Production, ESALQ/USP, Piracicaba (SP), from 15/12/98 until 04/07/99. Treatments were combinations of three Cynodon spp. cultivars (Tifton-85, Florakirk and Coastcross) and four sward surface heights (SSH) (5, 10, 15 and 20 cm) maintained by sheep under continuous stocking and variable stocking rate. A
Publicado em: 2000
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28. Density-Dependent Selection Incorporating Intraspecific Competition. II. a Diploid Model
A diploid model is introduced and analyzed in which intraspecific competition is incorporated within the context of density-regulated selection. It is assumed that each genotype has a unique carrying capacity corresponding to the equilibrium population size when only that type is present. Each genotypic fitness at a single diallelic autosomal locus is a decr
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29. Intraspecific competition in the speckled wood butterfly Pararge aegeria: Effect of rearing density and gender on larval life history
In insects, the outcome of intraspecific competition for food during development depends primarily upon larval density and larval sex, but effects will also depend on the particular trait under consideration and the species under study. Experimental manipulations of larval densities of a Madeiran population of the speckled wood butterfly Pararge aegeria conf
University of Arizona Library.
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30. Global Models of Growth and Competition
Very precise data on the dynamics of a competitive system of two species of Drosophila have been obtained. By a curvilinear regression approach, analytical models of competition have been fitted. By statistical and biological criteria of simplicity, reality, generality, and accuracy, the best of these models has been chosen. This model represents an extensio
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31. Interspecific and intraspecific competition as causes of direct and delayed density dependence in a fluctuating vole population
A 3- to 5-year cycle of vole abundances is a characteristic phenomenon in the ecology of northern regions, and their explanation stands as a central theoretical challenge in population ecology. Although many species of voles usually coexist and are in severe competition for food and breeding space, the role of interspecific competition in vole cycles has nev
The National Academy of Sciences.
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32. Evolutionary disarmament in interspecific competition.
Competitive asymmetry, which is the advantage of having a larger body or stronger weaponry than a contestant, drives spectacular evolutionary arms races in intraspecific competition. Similar asymmetries are well documented in interspecific competition, yet they seldom lead to exaggerated traits. Here we demonstrate that two species with substantially differe
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33. Habitat structure determines competition intensity and invasion success in gecko lizards
Species diversity is correlated with structural complexity in many animal communities; however, experimental tests of the mechanisms underlying this important relationship are rare, especially in terrestrial communities. We manipulated physical features of the habitat of gecko lizards and measured the effect on exploitation competition for insects. Increasin
The National Academy of Sciences.
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34. Evolution of eusociality and the soldier caste in termites: Influence of intraspecific competition and accelerated inheritance
We present new hypotheses and report experimental evidence for powerful selective forces impelling the evolution of both eusociality and the soldier caste in termites. Termite ancestors likely had a nesting and developmental life history similar to that of the living family Termopsidae, in which foraging does not occur outside the host wood, and nonsoldier h
National Academy of Sciences.
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35. Sexual selection at the protein level drives the extraordinary divergence of sex-related genes during sympatric speciation.
An increasing number of molecular studies are indicating that, in a wide variety of species, genes directly related to fertilization evolve at extraordinarily high rates. We try to gain insight into the dynamics of this rapid evolution and its underlying mechanisms by means of a simple theoretical model. In the model, sexual selection and sympatric speciatio
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36. Conidium Germination Rate in Wild and Domesticated Yellow-Green Aspergilli
Conidia of domesticated yellow-green aspergilli from strains of Aspergillus oryzae (Ahlburg) Cohn and Aspergillus sojae Sakaguchi and Yamada ex Murakami, used in the preparation of koji inoculum, germinate approximately 3 h sooner than conidia produced by related wild species, Aspergillus flavus Link ex Fr. and Aspergillus parasiticus Speare. There was no co