Dispersal Constraints
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Grandes rios e a distribuição de Odonata na Amazônia: similaridade de composição, limitação à dispersão e endemismo. / Large Rivers and the distribution in Amazon: Similarity of composition,dispersal constraints and endemism.
As florestas da Bacia Amazônica contêm a maior fração da diversidade de espécies do mundo. Muitas hipóteses têm sido propostas para explicar a origem e a manutenção dessa grande diversidade, baseadas, principalmente, nos mecanismos de migração, especiação e nas restrições ambientais impostas pelo ambiente aos organismos. Uma dessas hipóteses
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2011
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2. Diversidade beta no interflúvio Purus- Madeira : determinantes da estrutura das comunidades de Marantaceae, Araceae e Pteridófitas ao longo da BR 319, Amazonas, Brasil
Knowledge of the distribution of species along environmental and spatial gradients is very important for the development of wise conservation policies. It is known that environmental heterogeneity is a key factor on the determination of a natural community s structure. Many studies suggest the existence of surrogate groups, i.e. groups that indicate more gen
Publicado em: 2006
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3. The evolution of cooperative breeding in birds: kinship, dispersal and life history
The evolution of cooperation among animals has posed a major problem for evolutionary biologists, and despite decades of research into avian cooperative breeding systems, many questions about the evolution of their societies remain unresolved. A review of the kin structure of avian societies shows that a large majority live in kin-based groups. This is consi
The Royal Society.
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4. Dispersal costs set the scene for helping in an atypical avian cooperative breeder.
The ecological constraints hypothesis is suggested to explain the evolution of cooperative breeding in birds. This hypothesis predicts that the scene for cooperative breeding is set when ecological factors constrain offspring from dispersal. This prediction was tested in the atypical cooperative breeding system of the long-tailed tit, Aegithalos caudatus, by
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5. Neutrality, niches, and dispersal in a temperate forest understory
A fundamental goal of ecology is to understand what controls the distribution and abundance of species. Both environmental niches and trade-offs among species in dispersal and competitive ability have traditionally been cited as determinants of plant community composition. More recently, neutral models have shown that communities of species with identical li
National Academy of Sciences.
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6. Temporal and Spatial Heterogeneity of Mtdna Polymorphisms in Natural Populations of Drosophila mercatorum
Restriction endonuclease analysis of mtDNA was used to examine the genetic relatedness of several geographically separated isolines of the Drosophila mercatorum subgroup. In addition, we examined the temporal and spatial distribution of two mtDNA restriction site polymorphisms produced by the enzymes BstEII and BstNI at a single locality—Kamuela, Hawaii.
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7. Hutchinson's duality: The once and future niche
The duality between “niche” and “biotope” proposed by G. Evelyn Hutchinson provides a powerful way to conceptualize and analyze biogeographical distributions in relation to spatial environmental patterns. Both Joseph Grinnell and Charles Elton had attributed niches to environments. Attributing niches, instead, to species, allowed Hutchinson's key inn
National Academy of Sciences.