Julien Grangier

Julien Grangier

PhD Ecology, Biodiversity, Evolution

About

25
Publications
3,558
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
369
Citations

Publications

Publications (25)
Article
Full-text available
Although associations between myrmecophytes and their plant ants are recognized as a particularly effective form of protective mutualism, their functioning remains incompletely understood. This field study examined the ant-plant Hirtella physophora and its obligate ant associate Allomerus decemarticulatus. We formulated two hypotheses on the highly...
Article
Full-text available
This study reports a novel form of interference behaviour between the invasive wasp Vespula vulgaris and the New Zealand native ant Prolasius advenus. By videotaping interactions at bait stations, we found that wasps commonly remove ant competitors from food resources by picking up the workers in their mandibles, flying backward and dropping them u...
Article
Full-text available
In the understory of pristine Guianese forests, the myrmecophyte Hirtella physophora almost exclusively shelters colonies of the plant-ant Allomerus decemarticulatus in its leaf pouches. We experimentally tested three non-mutually exclusive hypotheses concerning phenomena that can determine the species specificity of this association throughout the...
Article
Full-text available
1. Behavioural responses to varying macronutrient availability are increasingly studied in highly invasive ant species to better understand their ecological success. However, such work is lacking in relation to native ant species confronted with biological invaders. 2. Here the link between diet and behaviour was examined in Prolasius advenus, a n...
Article
Full-text available
Aim: Cities are thought to promote biological invasions because invasive species are more often introduced in urban areas and because they are more successful in disturbed environments. However, the association is not as strongly supported by the literature as is generally assumed and might depend on how urbanization and invasion are measured. In t...
Article
Full-text available
Understanding the distribution of parasites is crucial for biodiversity conservation. Here, we studied the distribution of the ectoparasitic fungus Laboulbenia formicarum in native and invasive Lasius ants in a 2000 km² area. We screened over 16,000 ant workers in 478 colonies of five different species. We found that Lab. formicarum was rare in nat...
Article
Full-text available
A successful control or eradication programme using biological control or genetically-mediated methods requires knowledge of the origin and the extent of wasp genetic diversity. Mitochondrial DNA variation in the native and invaded range of the social wasp Vespula germanica was used to examine intra-specific genetic variation and invasive source po...
Article
Full-text available
Multiple biotic and abiotic factors influence species coexistence and co-occurrence patterns. In a competitive environment, for example, temperature and diet variation may modify both foraging behaviour and aggression, thereby changing competitive interactions and species co-occurrence patterns. In New Zealand, two endemic ant species (Prolasius ad...
Article
Full-text available
Au XVIIIè siècle, les explorateurs européens étaient frappés par le chant puissant des nuées d’oiseaux qui habitaient alors les forêts de certains rivages néo-zélandais. Deux siècles plus tard, un son inédit inonde les mêmes régions : un bourdonnement sourd qui hante les canopées du matin au soir. C’est qu’entre-temps, les guêpes sociales ont fait...
Article
Full-text available
The arrival sequence of organisms in a habitat and their diet are two factors that are thought to modulate animal performance, affect the outcome of behavioural interactions, and shape communities. In New Zealand, two species that seldom co-occur in field populations are Prolasius advenus and Monomorium antarcticum. Herein we tested the hypotheses...
Article
Full-text available
The ability of workers to produce male individuals is reported here for the first time in a species of the formicine ant genus Prolasius. We show that Prolasius advenus workers possess ovaries and demonstrate that they are able to produce adult males in queenless colonies. We also experimentally tested the influence of queen volatiles on the level...
Article
Diploscapter formicidae sp. n. was collected from the ant Prolasius advenus and its nests in native beech forests of the South Island, New Zealand. This is a new host record for the nematode genus and the first report of an ant associate from the southern hemisphere. Diploscapter formicidae sp. n. appears to be native to New Zealand. No males were...
Article
Full-text available
One of the most successful invasive species is the common wasp, Vespula vulgaris. We recently reported how foragers of this species have adopted previously unknown interference behavior when competing for food with native ants. Picking their opponents up in their mandibles, flying backward and dropping them some distance away from the disputed reso...
Article
Full-text available
Myrmecophytic symbioses are widespread in tropical ecosystems and their diversity makes them useful tools for understanding the origin and evolution of mutualisms. Obligate ant-plants, or myrmecophytes, provide a nesting place, and, often, food to a limited number of plant-ant species. In exchange, plant-ants protect their host plants from herbivor...
Article
Full-text available
Abstract 1. The biology of most invasive species in their native geographical areas remains largely unknown. Such studies are, however, crucial in shedding light on the ecological and evolutionary processes underlying biological invasions.2. The present study focuses on the little fire ant Wasmannia auropunctata, a species native to Central and Sou...
Article
Full-text available
Background: Among arboreal ants, both territorially dominant species and plant-ants (e.g. species associated with myrmecophytes or plants housing them in hollow structures) protect their host trees against defoliators. Yet, locally induced responses, or the recruitment of nest-mates when a worker discovers a wound on its host-tree, were only noted...
Article
Full-text available
In studying the ant genus Azteca, a Neotropical group of arboreal species, we aimed to determine the extent to which the ants use predation and/or aggressiveness to protect their host plants from defoliating insects. We compared a territorially dominant, carton-nester, Azteca chartifex, and three plant-ant species. Azteca alfari and Azteca ovaticep...
Article
Full-text available
It is well known that arboreal ants, both territorially dominant species and plant ants (e.g., species associated with myrmecophytes or plants housing them in hollow structures), protect their host trees from defoliators. Nevertheless, the presence of an induced defense, suggested by the fact that the workers discovering a leaf wound recruit nestma...
Article
Full-text available
Little is known about the aggressiveness of plant-ants typically living in isolated trees nor about how that aggressiveness varies based on this isolation. Here, we examine intra- and interspecific aggressiveness between workers of two Allomerus species associated with two different myrmecophytes. In both cases, the level of intraspecific aggressiv...
Article
Full-text available
The little fire ant Wasmannia auropunctata is able to develop highly dominant populations in disturbed areas of its native range, with a resulting negative impact on ant diversity. We report here on the tolerance of such populations towards several fungus-growing ants of the genus Cyphomyrmex (rimosus complex) in French Guiana. This tolerance is su...
Article
Full-text available
This study aimed at showing the applicability of using a combination of four sampling methods (i.e., Winkler extractors, pitfall traps, baiting and manual collection), something most often conducted in the tropics, to create an inventory of ant species diversity in temperate environments. We recorded a total of 33 ant species in the Grands Causses...
Article
Full-text available
En théorie, les dérives vers l'exploitation nidirectionnelle sont fréquemment possibles dans les mutualismes, du fait d'anciens mutualistes évoluant vers le parasitisme ou d'organismes extérieurs s'immisçant dans les associations. Paradoxalement, les mutualismes sont partout. Comment perdurent-ils face à ces pressions déstabilisatrices ? Nous avons...

Network

Cited By