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108 results for “Fire ants”
Data from: Global invasion history of the Tropical Fire Ant: a stowaway on the first global trade routes
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Data from: Propagule pressure and colony social organization are associated with the successful invasion and rapid range expansion of fire ants in China
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Data from: Genetic analyses reveal cryptic diversity in the native North American fire ants (Hymenoptera: Formicidae: Solenopsis)
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Data from: Burning for biodiversity: highly resilient ant communities respond only to strongly contrasting fire regimes in Australia’s seasonal tropics
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Data from: Ants, fire and bark traits affect how African savanna trees recover following damage
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Data from: Decreased small mammal and on-host tick abundance in association with invasive red imported fire ants (Solenopsis invicta)
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Data from: Evolution of long centromeres in fire ants
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Data from: The fire ant social chromosome supergene variant Sb shows low diversity but high divergence from SB
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Data from: Positive selection on sociobiological traits in invasive fire ants
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Data from: Invasion and high-elevation acclimation of the red imported fire ant, Solenopsis invicta, in the southern Blue Ridge escarpment region
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Tube locations of the red imported fire ant (RIFA)
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Data from: "Worker queens"? Behavioral flexibility, juvenile hormone binding protein and Vitellogenin in queens of the little fire ant Wasmannia auropunctata
<p>Many species of social Hymenoptera demonstrate behavioral flexibility, where older workers that typically forage can revert to younger worker tasks, such as nursing, when these are absent. This flexibility is typical of the sterile worker class, yet rare in queens. In the little fire ant (<i>Wasmannia auropunctata</i>) queens have been reported to perform only egg laying. We examined behavior of queens of <i>W. auropunctata</i> after demographic manipulation. When half of the workers were removed from the colony, queens were observed caring for eggs, larvae and pupae as well as eating outside of the nest, like forager workers. We examined the relationship between these atypical queen behaviors and their juvenile hormone binding protein (JHbp) and vitellogenin (Vg) expression via QRT-PCR method. JHbp and Vg expression decreased when queens were performing worker tasks, resembling the expected expression pattern of typical sterile workers. Flexibility in queen behaviors in the little fire ant may be an important adaptation to changing environments. As a significant invasive species, such adaptation may increase the probability of colony survival during propagation. Our results not only present new insights in behavioral flexibility in social insects, but also increases our understanding of the success of this significant invasive species. </p>
The Cryptic impacts of invasion: functional homogenization of tropical ant communities by invasive fire ants
<p>The diversity and distribution of traits in an ecological community shapes its responses to change and the ecosystem processes it modulates. This 'functional diversity', however, is not necessarily a direct outcome of taxonomic diversity. Invasions by exotic insects occur in ecosystems worldwide, but there is limited understanding of how they impact functional diversity. We present the first comprehensive trait-based investigation of the impacts of an ant invasion, and the first incorporating intraspecific polymorphisms in species-level functional diversity. The fire ant <em>Solenopsis invicta</em> is an invasive species with a global distribution. Focusing on invaded and uninvaded plots in tropical grasslands of Hong Kong, we investigated how the presence of <em>S. invicta</em> affects the diversity and distribution of ant species and traits within and across communities, the functional identities of communities, and functionally unique species. Using trait probability density functions, we built trait spaces for 29 species, and scaled up these components to calculate functional diversity at community and landscape levels. We found that invasion had limited effects on species and functional richness but pronounced effects on functional composition. Specifically, invaded communities had fewer functionally-unique individuals, and were characterized by species with narrower heads and bodies and shorter mandibles. Moreover, invaded communities showed substantially higher levels of functional redundancy (+56%) due to a clustering of trait values. Consequently, across the landscape, invaded communities displayed 23% less functional turnover than uninvaded communities despite showing comparable levels of taxonomic turnover – a result confirming theoretical predictions of the effects of high local functional redundancy. In sum, the presence of <em>S. invicta</em> alters the functional properties of multiple local communities selectively, resulting in functional homogenization across the landscape. The disparities between taxonomic and functional impacts of invasion highlight the need to consider how trait diversity across ecological scales shapes biodiversity and its responses to change.</p>
Data from: Disruption of gene expression in hybrids of the fire ants Solenopsis invicta and Solenopsis richteri
Transcriptome analysis is a powerful tool for unveiling the distribution and magnitude of genetic incompatibilities between hybridizing taxa. The nature of such incompatibilities is closely associated with the evolutionary histories of the parental species and may differ across tissues and between the sexes. In eusocial insects, the presence of castes that experience divergent selection regimes may result in additional distinct patterns of caste-specific hybrid incompatibilities. We analyzed levels of expression of >14,000 genes in two life stages of each caste and sex in the fire ants S. invicta and S. richteri and in their hybrids. We found strong contributions of both developmental stage and caste to gene expression patterns. Hybrid incompatibilities were surprisingly modest: only 32 genes were mis-expressed, indicating low levels of disruption in gene regulation in hybrids. The castes differed in numbers of mis-expressed genes, with males and workers each mis-expressing at least seven times as many genes as queens. Interestingly, homologues of many of the mis-expressed genes have been implicated in behavioral variation in Drosophila melanogaster. General expression profiles of hybrids were more similar to those of S. richteri than S. invicta, presumably because S. richteri trans-regulatory elements tend to be dominant to those of S. invicta and/or because there is an overall bias in the genetic composition of the hybrids towards S. richteri. Altogether, our results suggest that selection acting on each caste may contribute differently to interspecific divergence and speciation in this group of ants.
Data from: Distinct colony boundaries and larval discrimination in polygyne red imported fire ants (Solenopsis invicta)
<p>Evaluating the factors that promote invasive ant abundance is critical to assess their ecological impact and inform their management. Many invasive ant species show reduced nestmate recognition and an absence of boundaries between unrelated nests, which allow populations to achieve greater densities due to reduced intraspecific competition. We examined nestmate discrimination and colony boundaries in introduced populations of the red imported fire ant (<i>Solenopsis invicta</i>; hereafter, fire ant). Fire ants occur in two social forms: monogyne (colonies with a single egg-laying queen) and polygyne (colonies with multiple egg-laying queens). In contrast with monogyne nests, polygyne nests are thought to be interconnected due to the reduced antagonism between non-nestmate polygyne workers, perhaps because polygyne workers habituate the colony to an odor unique to <i>Gp-9<sup>b</sup></i>-carrying adults. However, colony boundaries and nestmate discrimination are poorly documented, particularly for worker-brood interactions. To delimit boundaries between field colonies, we correlated the exchange of a <sup>15</sup>N-glycine tracer dissolved in a sucrose solution with social form. We also evaluated nestmate discrimination between polygyne workers and larvae in the laboratory. Counter to our expectations, polygyne colonies behaved identically to monogyne colonies, suggesting both social forms maintain strict colony boundaries. Polygyne workers also preferentially fed larval nestmates and may have selectively cannibalized non-nestmates. The levels of relatedness among workers in polygyne colonies was higher than those previously reported in North America (mean ±SE: 0.269 ± 0.037). Our study highlights the importance of combining genetic analyses with direct quantification of resource exchange to better understand the factors influencing ant invasions.</p>
Data: Prescribed fire enhances seed removal by ants in a Neotropical savanna
<p>Seed dispersal and predation by animals often drive plant regeneration. In tropical savannas, such as the Cerrado of Brazil, fire is also a key process in ecosystem dynamics, consuming the lower vegetation strata and killing wildlife, but how fire affects seed-animal interactions is virtually unknown. We investigated the effects of prescribed fires on the removal of diaspores from Miconia rubiginosa and sunflower Helianthus annuus in Cerrado from southeast Brazil. Using plots burned one month or one year before sampling and unburned controls, we assessed the effect of prescribed fire on microhabitat structure and diaspore removal by vertebrates and ants. Covered microhabitats experienced higher seed removal by vertebrates than open microhabitats, but microhabitat features did not influence seed removal by ants. Prescribed fire did not change the total amount of seed removal, and ants were responsible for most removals in burned and control plots. However, fire increased the importance of ants as agents of removal compared to vertebrates. These changes were probably mediated by changes in microhabitat cover. It is likely that species whose seeds are often preyed upon by vertebrates benefit from fire to escape predation, while the opposite would be true for those removed by granivorous ants. By changing microhabitats composition and frequency of seed removal by different agents, fire may create pulses of opportunities for certain plant species to increase their populations and enlarge their spatial distribution, while constraining others. However, how different fire intensities and frequencies influence seed fate of different species is still to be investigated.</p>
Supplementary material 1 from: Helms IV JA, Bridge ES (2017) Range expansion drives the evolution of alternate reproductive strategies in invasive fire ants. NeoBiota 33: 67-82. https://doi.org/10.3897/neobiota.33.10300
Range expansion drives the evolution of alternate reproductive strategies in invasive fire ants :
Fig. 1 in Predaceous fire ants (Hymenoptera: Formicidae) at sea turtle (Testudines: Cheloniidae) nesting beaches and hatcheries in El Salvador
Fig. 1. Locations of study sites in El Salvador. Two sea turtle nesting beaches (diamonds) and 14 hatcheries (dots) were monitored along the coast of El Salvador in 2012. A = Bola de Monte; B = Barra de Santiago; C = Los Cobanos; D = San Diego; E = Toluca; F = Las Bocanitas; G = Zunganera; H = Costa del Sol 1; I = Costa del Sol 2; J = Isla Tasajera; K = San Juan del Gozo; L = Punta San Juan; M: La Pirraya; N = Las Isletas; O = El Espino; P = El Maculis; Q = El Tamarindo.
Figure 3 in The History of Little Fire Ant Wasmannia auropunctata Roger in the Hawaiian Islands: Spread, Control, and Local Eradication
Figure 3. Areas of Hawaii island currently infested with Wasmannia auropunctata (2016). (Not all properties in the larger shaded section are infested).
Census data of growth, mortality and size stage transitions of nests of leaf-cutting ant species before and after fires
<p>We hypothesized that fires will affect more the species that build external, easily flammable thatch mounds with superficial fungal gardens (<i>Acromyrmex lobicornis</i>) than colonies that build subterranean nests in the less-flammable bare-ground (<i>Acromyrmex striatus</i>). We use a stochastic matrix demographic model parameterized with 4 years of data in pre and post fire scenarios. This data set contain all the census data which from we build the matrix models.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.