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Accueil du site → Master → Etats Unis → 1987 → Effects of harvest ants, Pogonomyrmex rugosis, nest on soil properties and vegetation in the Chihuahuan Desert

New Mexico State University (1987)

Effects of harvest ants, Pogonomyrmex rugosis, nest on soil properties and vegetation in the Chihuahuan Desert

Di Marco RR

Titre : Effects of harvest ants, Pogonomyrmex rugosis, nest on soil properties and vegetation in the Chihuahuan Desert

Auteur : Di Marco RR

Université de soutenance : New Mexico State University

Grade : Master of Science (MS) 1987

Résumé
Cover and density of winter annual plants on the perimeters of ant nests were compared with those of adjacent reference sites in three habitats at Jornada LTER, New Mexico, USA. There was a distinct floristic assemblage of winter annual plants on ant nest perimeter in comparison to reference sites. Descurainia pinnnata, Lesquerella gordonii, Malacothrix fendleri, and Eriogonum abertianum were strongly associated with ant nest perimeters and had higher cover on ant nest perimeters. The floristic assemblages and cover were least affected by presence of harvester ant nests in the grama grassland habitat and most affected on the basin slope mixed habitat. Soil chemical analyses did not show large generalized differences in nutrient contents. However, there were higher concentrations of NO3-N and inorganic P on ant nest perimeters and also, there were different ratios of resources (e.g., water, and N and P availability) due to ant soil disturbance on ant nest perimeter. Floristic assemblage could be determined by a fortuitous juxtaposition of clumped seeds at beginning of winter, by intra and interspecific competition of winter annual during February and March, and mediated by ant clipping at the end of April and May. There was no significant differences in below ground biomass between ant nest perimeter and reference sites. This may be due to intense clipping of annual plants by ants on nest perimeters in April.

Mots Clés : annual plant, ant nests, ant nest, nutrients, ant nest, soil properties, ant nest, vegetation, ant, harvester, ant, Pogonomyrex, ant, Pogonomyrmex , nitrogen, nutrients, ant nests, phosphorus, Pogonomyrex, vegetation, Pogonomyrmex, soil properties, soil, ant nest,

Présentation (Jornada NMSU)

Page publiée le 24 avril 2016, mise à jour le 19 février 2018