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- Title
Microvertebrados fósiles asociados a montículos de hormigueros de Pogonomyrmex barbatus (Smith, 1858) (Hymenoptera: Formicidae) en Jalisco, México.
- Authors
Casillas-Ramírez, Yoalith Guadalupe; Uribe-Mú, Claudia Aurora; Mora-Núñez, Margarito; Vásquez-Bolaños, Miguel
- Abstract
Harvester ants of the genus Pogonomyrmex have shown great variation in the formations and materials that surround the entrance of their nests. In Zacoalco de Torres, Jalisco, Western Mexico, the ant species Pogonomyrmex barbatus, Smith, 1858 produces nests with mounds composed of pebbles and fossil microvertebrates. Fossils from the Neogene-Quaternary tectonic period are located in the Chapala-Zacoalco lagoon complex. In this study, estimates of the nest density, circumference, surface area, height and volume of the mounds, as well as the number and size of entrances to the nest were obtained from 11 anthills. Fifty three samples were collected to determine mound composition, weight, percentage of fossils, and the relationship between the total weight of the samples and the percentage of fossils they contain. The nest density of P. barbatus was 3.17/Ha, similar to that reported in intense grazing areas for other ant species of the genus Pogonomyrmex. The variation in mound volume is attributed to the relocation of gravel, fossils and other sediments caused by the activity of digger ants. The presence of fossils in the anthills favors the recognition of areas with fossiliferous potential. The mounds of those ants facilitates the fossil microvertebrates sampling, although there is the drawback that the samples from different strata are mixed due to the effect of the repositioning of materials carried out by the ants. There is a weak positive relationship between the weight of the samples and the percentage of fossils they contain, this suggests a great variation in the abundance of fossiliferous material obtained from the mounds by minimally invasive collections.
- Subjects
JALISCO (Mexico); MEXICO; FOSSILS; ANTS; SURFACE area; PEBBLES; GRAZING
- Publication
Dugesiana, 2023, Vol 30, Issue 2, p75
- ISSN
1028-3420
- Publication type
Article
- DOI
10.32870/dugesiana.v30i2.7287