Scramble Competition
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Dinâmica populacional, comportamento reprodutivo e uso do habitat em Telebasis carmesina Calvert, 1909 (Odonata: Coenagrionidae) no Cerrado de Uberlândia - MG. / Population dynamics, breeding behavior and habitat use in Telebasis carmesina Calvert, 1909 (Odonata: Coenagrionidae) in a Neotropical Savanna at Uberlândia, Minas Gerais state
Embora seja comum no cerrado, nada se sabe sobre a história natural e ecologia da libélula neotropical Telebasis carmesina (Odonata: Coenagrionidae). Nesse sentido, os objetivos desse estudo foram investigar a ecologia populacional, uso do habitat e o comportamento reprodutivo dessa espécie. O estudo foi conduzido em uma lagoa situada na RPPN do Clube de
Publicado em: 2010
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2. Seleção intra-sexual na libélula Homeoura nepos (Zygoptera: Coenagrionidae): conflito sexual e sistema de acasalamento
O dimorfismo sexual, as interações agonísticas e o tipo de associação de machos com suas parceiras sexuais são características submetidas a pressões seletivas que podem determinar o tipo de sistema de acasalamento de uma espécie. Em Odonata, dois tipos de sistemas de acasalamento predominam: a poliginia por defesa de recursos e a poliginia por scram
Publicado em: 2007
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3. Hierarquia social e sucesso alimentar em callithrix jacchus (Primates, Callithrichidae), sob condições naturais
A vida em grupo implica em competição por recursos entre os indivíduos. Competição do tipo Scramble é considerada um modo indireto de competição, associado principalmente a fatores como tamanho do grupo e distribuição dos recursos no ambiente. Competição do tipo Contest ocorre quando indivíduos competem diretamente por recursos. Em espécies suj
Publicado em: 2007
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4. Life history consequences of mammal sibling rivalry
Mammal life history traits relating to growth and reproduction are extremely diverse. Sibling rivalry may contribute to selection pressures influencing this diversity, because individuals that are relatively large at birth typically have an advantage in competition for milk. However, selection for increased growth rate is likely to be constrained by kin sele
The National Academy of Sciences.
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5. Body condition but not dietary restriction prolongs lifespan in a semelparous capital breeder
Effects of diet on longevity are complex because acquired resources are shared among growth, reproduction and somatic maintenance. We simplify these axes by examining how dietary restriction and competitive contexts affect longevity using semelparous males of the Australian redback spider (Latrodectus hasselti). Plastic development of L. hasselti males resul
The Royal Society.
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6. Fine-tuned modulation of competitive behaviour according to kinship in barn swallow nestlings
Kin selection theory predicts that, in species where progeny members compete for limiting parental care, individual offspring should be more prone to monopolize parental resources as their genetic relatedness to brood competitors decreases. Mixed parentage among broodmates may arise as a consequence, for example, of extra-pair fertilization or brood parasiti
The Royal Society.
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7. A growth cost of begging in captive canary chicks
Nestling birds solicit food from adults by using begging displays that appear paradoxically costly and wasteful. Theoretical work suggests that the evolution of such exuberant offspring behavior reflects parent–offspring conflict over the supply of parental investment. Originally, extravagant begging was seen as a means of psychological trickery by wh
The National Academy of Sciences.
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8. Visual constraints in foraging bumblebees: Flower size and color affect search time and flight behavior
In optimal foraging theory, search time is a key variable defining the value of a prey type. But the sensory-perceptual processes that constrain the search for food have rarely been considered. Here we evaluate the flight behavior of bumblebees (Bombus terrestris) searching for artificial flowers of various sizes and colors. When flowers were large, sea
The National Academy of Sciences.