author = "Boulay, Raphaël"

Encontrado 97 documentos, página mostrada 1 de 10

Behaviour-mediated group size effect constrains reproductive decisions in a social insect

Description: The formation of cooperative entities between lower-level units is characterized by increasing complexity. Apart from the degree of cooperation, social complexity is determined by the number of cooperative individuals. Previous studies have considered the relationships between group size and traits ...
Language(s): Inglés

Geographic variations in Helleborus foetidus elaiosome lipid composition: implications for dispersal by ants

Description: 7 pages, 4 tables, 2 figures.-- Available online Nov 17, 2005. , Geographic variations in the correspondence between diaspore phenotypes and disperser behavior are thought to determine the evolution of plant-animal dispersal mutualisms. Helleborus foetidus is a widely distributed plant in Western Europ...
Language(s): Inglés

Foraging by fearful frugivores: combined effect of fruit ripening and predation risk

Description: 1. Plant defensive compounds and predation risk are main determinants of herbivore foraging, though empirical studies have seldom measured the combined effects of these two factors. By considering the interaction between the herb Helleborus foetidus and its main fruit and seed predator, the Wood M...
Language(s): Inglés

Foraging by fearful frugivores: combined effect of fruit ripening and predation risk

Description: 1. Plant defensive compounds and predation risk are main determinants of herbivore foraging, though empirical studies have seldom measured the combined effects of these two factors. By considering the interaction between the herb Helleborus foetidus and its main fruit and seed predator, the Wood M...
Language(s): Inglés

Behaviour-mediated group size effect constrains reproductive decisions in a social insect

Description: The formation of cooperative entities between lower-level units is characterized by increasing complexity. Apart from the degree of cooperation, social complexity is determined by the number of cooperative individuals. Previous studies have considered the relationships between group size and traits ...
Language(s): Inglés

Geographic variations in Helleborus foetidus elaiosome lipid composition: implications for dispersal by ants

Description: 7 pages, 4 tables, 2 figures.-- Available online Nov 17, 2005. , Geographic variations in the correspondence between diaspore phenotypes and disperser behavior are thought to determine the evolution of plant-animal dispersal mutualisms. Helleborus foetidus is a widely distributed plant in Western Europ...
Language(s): Inglés

Social hybridogenesis in the clonal ant Cataglyphis hispanica

Description: With a few rare exceptions, the vast majority of animals reproduce sexually [1-3]. Some species have, however, evolved alternative modes of reproduction by shifting from classical bisexuality to unorthodox reproductive systems, like parthenogenesis, gynogenesis, or hybridogenesis [4, 5]. Under hybri...
Language(s): Inglés

Indirect effects of alternative food resources in an ant-plant interaction

Description: The seeds of many plant species present a food body that is consumed by animal dispersers. In theory, if the animals are polyphagous, the availability of alternative food resource other than the diaspore itself may influence its dispersal and survival. We used the myrmecochore Helleborus foetidus L....
Language(s): Inglés

Solar Elevation Triggers Foraging Activity in a Thermophilic Ant

Description: Nycthemeral rhythm is an important biological trait that allows animals to escape predation and competition and, conversely, to coincide with mutualists. Although laboratory studies have shown that the rhythm depends on both endogenous factors and cyclic environmental cues, the latter is often poorl...
Language(s): Inglés

Encontrado 97 documentos, página mostrada 1 de 10

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