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269 results for “harvester ants”
Fig. 6. Tetramorium barbigerum Bolton, 1980 in A taxonomic revision of seed harvester ants of the Tetramorium solidum group (Hymenoptera: Formicidae) in southern Africa
Fig. 6. Tetramorium barbigerum Bolton, 1980 (CASTYPE13386 – Antweb, photographer unknown). A. Body in profile. B. Body in dorsal view. C. Head in full-face view.
Data from: Turning one into five: integrative taxonomy uncovers complex evolution of cryptic species in the harvester ant Messor "structor"
Seed harvesting ants are ecosystem engineers that shape vegetation, nutrient cycles, and microclimate. Progress in ecological research is, however, slowed down by poor species delimitation. For example, it has not been resolved to date, how many species the European harvester ant Messor "structor" (Latreille, 1798) represents. Since its first description, splitting into additional taxa was often proposed but not accepted later on due to inconsistent support from morphology and ecology. Here, we took an iterative integrative-taxonomy approach – comparing multiple, independent data sets on the same sample – and used traditional morphometrics, Wolbachia symbionts, mitochondrial DNA, amplified fragment length polymorphism, and ecological niche modelling. Using the complementarity of the data sets applied, we resolved multiple, strong disagreements over the number of species, ranging from four to ten, and the allocation of individuals to species. We consider most plausible a five-species hypothesis and conclude the taxonomic odyssey by redescribing Messor structor, M. ibericus Santschi, 1925, and M. muticus (Nylander, 1849) stat.rev., and by describing two new species, M. ponticus sp.n. and M. mcarthuri sp.n. The evolutionary explanations invoked in resolving the various data conflicts include pronounced morphological crypsis, incomplete lineage-sorting or ongoing cospeciation of endosymbionts, and peripatric speciation – these ants' significance to evolutionary biology parallels that to ecology. The successful solution of this particular problem illustrates the usefulness of the integrative approach to other systematic problems of comparable complexity and the importance of understanding evolution to drawing correct conclusions on species' attributes, including their ecology and biogeography.
Desiccation limits recruitment in the pleometrotic desert seed-harvester ant Veromessor pergandei
<p>The desert harvester ant <i>Veromessor pergandei </i>displays geographic variation in colony founding with queens initiating nests singly (haplometrosis) or in groups (pleometrosis). The transition from haplo- to pleometrotic founding is associated with lower rainfall. Numerous hypotheses have been proposed to explain the evolution of cooperative founding in this species, but the ultimate explanation remains unanswered. In laboratory experiments, water level was positively associated with survival, condition, and brood production by single queens. Queen survival also was positively influenced by water level and queen number in a two-factor experiment. Water level also was a significant effect for three measures of queen condition, but queen number was not significant for any measure. Foundress queens excavated after two weeks of desiccating conditions were dehydrated compared to alate queens captured from their natal colony, indicating that desiccation can be a source of queen mortality. Long-term monitoring in central Arizona, USA, documented that recruitment only occurred in 4 of 20 years. A discriminant analysis using rainfall as a predictor of recruitment correctly predicted recruitment in 17 of 20 years for total rainfall from January–June (the period for mating flights and establishment) and in 19 of 20 years for early plus late rainfall (January–March and April–June, respectively), often with a posterior probability > 0.90. Moreover, recruitment occurred only in years in which both early and late rainfall exceeded the long-term mean. This result also was supported by the discriminant analysis predicting no recruitment when long-term mean early and late rainfall were included as ungrouped periods.<b> </b>These data suggest that pleometrosis in <i>V. pergandei</i> evolved to enhance colony survival in areas with harsh abiotic (desiccating) conditions, facilitating colonization of habitats in which solitary queens could not establish even in wet years. This favorable-year hypothesis supports enhanced worker production as the primary advantage of pleometrosis.</p>
Fig. 3 in Mixed colonies and hybridisation of Messor harvester ant species (Hymenoptera: Formicidae)
Fig. 3 Distances measured for morphometric characters ScBaC and ScBW
Data from: Convergent evolution of social hybridogenesis in Messor harvester ants
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Data from: Grassland harvesting alters ant community trophic structure: an isotopic study in tallgrass prairies
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Data from: Turning one into five: integrative taxonomy uncovers complex evolution of cryptic species in the harvester ant Messor "structor"
Open the record for dataset details and reuse information.
Desiccation limits recruitment in the pleometrotic desert seed-harvester ant Veromessor pergandei
Open the record for dataset details and reuse information.
Fig. 24 in A taxonomic revision of seed harvester ants of the Tetramorium solidum group (Hymenoptera: Formicidae) in southern Africa
Fig. 24. Map showing the distribution of species in the Tetramorium solidum group.
FIGURE 115 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 115. Photographs of Pogonomyrmex naegelii male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0172688). Photographs by April Nobile from www.AntWeb.org.
FIGURE 111 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 111. Photographs of Pogonomyrmex weiseri male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0172680). Photographs by April Nobile from www.AntWeb.org.
FIGURE 88 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 88. Photographs of Pogonomyrmex semistriata alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0923352). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 68 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 68. Geographic distribution of: (A) Pogonomyrmex pronotalis, (B) P. propinqua, (C) P. pulchellus. The large black circle in each panel denotes the type locality. See text regarding the type locality for P. pulchellus.
FIGURE 58 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 58. Photographs of Pogonomyrmex maulensis holotype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0914363). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 56 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 56. Photographs of Pogonomyrmex mapuche holotype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0280988). Photographs by Estella Ortega from www.AntWeb.org.
FIGURE 53 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 53. Photographs of Pogonomyrmex longibarbis alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0923349). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 54 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 54. Photographs of Pogonomyrmex longibarbis brachypterous queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922099). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 93 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 93. Photographs of Pogonomyrmex spinolae male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0914361). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 50 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 50. Photographs of Pogonomyrmex loaensis male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922563). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 23 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 23. Photographs of Pogonomyrmex bolivianus holotype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0914125). Photographs by Michele Esposito from www.AntWeb.org.
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Allen Brain Atlas
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
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