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269 results for “harvester ants”
Experimental treatments and survival of transplanted harvester ant colonies
<p>In sessile organisms such as plants and benthic invertebrates, founding propagules typically suffer extremely high rates of mortality due to both extrinsic and intrinsic factors. Many social insect species share similarities with these groups, but factors influencing early colony survival are relatively unstudied. </p> <p>We used a field experiment to measure the importance of environmental quality relative to intrinsic colony properties in the harvester ant, Pogonomyrmex occidentalis, by monitoring the survival of 584 experimental colonies. Colony survival was primarily determined by intrinsic factors. Multiple mating by the queen and larger colony size at the time of transplant increased survival, but queen size, maternal lineage and the composition of plant species in the vicinity of the colony did not. Food supplementation increased survival significantly when natural food was scarce, but was not consistently beneficial, in contrast to predictions. </p> <p>Our results emphasize the general importance of rapid growth and early attainment of large size in the survival of sessile species. However, attributes specific to ants, their sociality and mating system, also strongly affected survival. Colonies with multiply-mated queens were more likely to survive over a wide range of circumstances, highlighting the importance of this trait even at the early stages of colony life.</p> <p>These are data to support the paper "The benefits of being big and diverse: early colony survival in harvester ants." The data are the experimental traits of the colonies used for transplantation (size and lineage of the queen, size of the colony, mating status, food treatment, local vegetation), the characteristics of the transplant itself (year of transplant and the transplant set) as well as the experimental results (the duration of survival and whether the colony survived until the end of the experiment).</p>
Mucilage-binding to ground protects seeds of many plants from harvester ants: a functional investigation
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Human disturbance and aridity influence biomass harvesting by leaf-cutting ants with impacts on nutrient dynamics in a Caatinga dry forest
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Experimental treatments and survival of transplanted harvester ant colonies
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Data from: Genetic and phenotypic responses to habitat fragmentation in a European harvester ant
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Data from: Cryptic lineages hybridize for worker production in the harvester ant Messor barbarus
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Data from: Harvester ant nest architecture is more strongly affected by intrinsic than extrinsic factors
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Data from: Offspring size and reproductive allocation in harvester ants
A fundamental decision that an organism must make is how to allocate resources to offspring, both with respect to size and to number. The two major theoretical approaches to this problem, optimal offspring size and optimistic brood size models, make different predictions that may be reconciled by including how offspring fitness is related to size. We extended the reasoning of Trivers and Willard (1973) to derive a general model of how parents should allocate additional resources with respect to the number of males and females produced, and among individuals of each sex, based on the fitness payoffs of each. We then predicted how harvester ant colonies should invest additional resources, and tested three hypotheses derived from our model, using data from three years of food supplementation bracketed by six years without food addition. All major results were predicted by our model: Food supplementation increased the number of reproductives produced. Male, but not female, size increased with food addition; the greatest increases in male size occurred in colonies that made small females. We discuss how use of a fitness landscape improves quantitative predictions about allocation decisions. When parents can invest differentially in offspring of different types, the best strategy will depend on parental state as well as the effect of investment on offspring fitness.
FIGURE 11 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 11. Geographic distribution of: (A) Pogonomyrmex magnacanthus Cole, (B) Pogonomyrmex hoelldobleri Johnson, Overson & Moreau, and (C) Pogonomyrmex mohavensis Johnson; the larger filled black circle in each panel denotes the type locality. All three maps are drawn on the same geographic area so that distribution patterns are directly comparable.
FIGURE 9 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 9. Photograph of Pogonomyrmex mohavensis Johnson alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body.
FIGURE 10 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 10. Phylogram of species in the Pogonomyrmex californicus group as inferred through Bayesian analysis for the partitioned dataset. Specimens of P. hoelldobleri are in the dashed box. Branch lengths are proportional to substitution/site as indicated by the bottom legend inset. Clade support greater than 50% is denoted on branches and in the top insert as follows: values above and below branches represent Bayesian posterior probabilities (BPP) and maximum likelihood bootstrap (ML BS), respectively, for the partitioned dataset followed by the single dataset. Clade support of "--" denotes clades not supported in an individual analysis. Numbers following each species name refer to the accession number of the series from which the individual was taken; locale data are given for each series in Table 1. Pogonomyrmex californicus, P. hoelldobleri, and P. magnacanthus occurred sympatrically at one site (designated by an *).
FIGURE 8 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 8. Photograph of Pogonomyrmex hoelldobleri Johnson, Overson & Moreau male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body.
FIGURE 7 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 7. Photograph of Pogonomyrmex hoelldobleri Johnson, Overson & Moreau alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body.
FIGURE 6 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 6. Photograph of Pogonomyrmex hoelldobleri Johnson, Overson & Moreau—HOLOTYPE worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body.
FIGURE 4 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 4. Photograph of Pogonomyrmex magnacanthus Cole alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body.
FIGURE 1 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 1. Photograph of Pogonomyrmex magnacanthus Cole—HOLOTYPE worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body.
FIGURE 3 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 3. Bivariate plots for workers: (A) maximum eye diameter versus head width, (B) ocular index versus head width, and (C) malar ratio versus head width (n = 63 for P. magnacanthus Cole, n = 59 for P. hoelldobleri Johnson, Overson & Moreau, plus 16 PARATYPE workers of P. magnacanthus that do not belong to the latter species [see text], n = 25 for P. mohavensis Johnson). Non-type workers were selected to represent the geographic range of each species.
FIGURE 5 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 5. Photograph of Pogonomyrmex magnacanthus Cole male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body.
FIGURE 2 in A New Species of Seed-harvester Ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran Deserts of North America
FIGURE 2. Photographs of diagnostic characters to distinguish between workers of P. magnacanthus Cole and those of P. hoelldobleri Johnson, Overson & Moreau and P. m o h a v e n s i s Johnson. Photograph of P. magnacanthus PARATYPE worker: (A) eye and malar area (MOD = 0.44, OI = 29.5, MR = 0.98), and circumocular whorls indistinct to absent, moderately granulate toward vertex, and (B) circumocular whorls present. Photograph of P. hoelldobleri worker: (C) eye and malar area for HOLOTYPE worker (MOD = 0.36, OI = 23.2, MR = 1.17), and absence of circumocular whorls—rugae converging near vertex, and (D) absence of circumocular whorls—area posterior to eyes with faint rugae. Photograph of P. m o h a v e n s i s worker: (E) eye and malar area for PARATYPE worker (MOD = 0.33, OI = 21.7, MR = 1.36), and absence of circumocular whorlsrugae extending to vertex, with rugae becoming weak to absent on/near vertex, and (F) absence of circumocular whorls—rugae extending to vertex; vertex rugose.
FIGURE 8 in A taxonomic revision of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae) on Hispaniola
FIGURE 8. Photograph of Pogonomyrmex saucius Wheeler & Mann paralectotype male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0217245). Photographs by Erin Prado from www.antweb.org.
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