Butterfly Pattern Research Articles

The ivory lncRNA regulates seasonal color patterns in buckeye butterflies

Long noncoding RNAs (lncRNAs) are transcribed elements increasingly recognized for their roles in regulating gene expression. Thus far, however, we have little understanding of how lncRNAs contribute to evolution and adaptation. Here, we show that a conserved lncRNA, ivory, is an important color patterning gene in the buckeye butterfly Junonia coenia. ivory overlaps with cortex, a locus linked to multiple cases of crypsis and mimicry in Lepidoptera. Along with a companion paper by Livraghi et al., we argue that ivory, not cortex, is the color pattern gene of interest at this locus. In J. coenia, a cluster of cis-regulatory elements (CREs) in the first intron of ivory are genetically associated with natural variation in seasonal color pattern plasticity, and targeted deletions of these CREs phenocopy seasonal phenotypes. Deletions of different ivory CREs produce other distinct phenotypes as well, including loss of melanic eyespot rings, and positive and negative changes in overall wing pigmentation. We show that the color pattern transcription factors Spineless, Bric-a-brac, and Ftz-f1 bind to the ivory promoter during wing pattern development, suggesting that they directly regulate ivory. This case study demonstrates how cis-regulation of a single noncoding RNA can exert diverse and nuanced effects on the evolution and development of color patterns, including modulating seasonally plastic color patterns.

A long noncoding RNA at the cortex locus controls adaptive coloration in butterflies

Evolutionary variation in the wing pigmentation of butterflies and moths offers striking examples of adaptation by crypsis and mimicry. The cortex locus has been independently mapped as the locus controlling color polymorphisms in 15 lepidopteran species, suggesting that it acts as a genomic hotspot for the diversification of wing patterns, but functional validation through protein-coding knockouts has proven difficult to obtain. Our study unveils the role of a long noncoding RNA (lncRNA) which we name ivory, transcribed from the cortex locus, in modulating color patterning in butterflies. Strikingly, ivory expression prefigures most melanic patterns during pupal development, suggesting an early developmental role in specifying scale identity. To test this, we generated CRISPR mosaic knock-outs in five nymphalid butterfly species and show that ivory mutagenesis yields transformations of dark pigmented scales into white or light-colored scales. Genotyping of Vanessa cardui germline mutants associates these phenotypes to small on-target deletions at the conserved first exon of ivory. In contrast, cortex germline mutant butterflies with confirmed null alleles lack any wing phenotype and exclude a color patterning role for this adjacent gene. Overall, these results show that a lncRNA gene acts as a master switch of color pattern specification and played key roles in the adaptive diversification of wing patterns in butterflies.

Wave transmission in quasi-periodic lattices.

Structural lattices with quasi-periodic patterns possess interesting dynamic features that can be exploited to control, localize and redirect propagating waves. In this work, we show that the properties of a large class of quasi-periodic locally resonant systems (approximated as periodic, with arbitrarily large period) can be performed by defining an equivalent discrete system. Several properties of wave propagation can a priori be demonstrated with reference to this system. Results in terms of bulk spectrum, showing the Hofstadter butterfly pattern, and of topological modes are then discussed in detail with reference to a simple example of quasi-periodic lattice. This article is part of the theme issue 'Current developments in elastic and acoustic metamaterials science (Part 2)'.

Study on the Luminescence Performance and Anti-Counterfeiting Application of Eu2+, Nd3+ Co-Doped SrAl2O4 Phosphor.

This manuscript describes the synthesis of green long afterglow nanophosphors SrAl2O4:Eu2+, Nd3+ using the combustion process. The study encompassed the photoluminescence behavior, elemental composition, chemical valence, morphology, and phase purity of SrAl2O4:Eu2+, Nd3+ nanoparticles. The results demonstrate that after introducing Eu2+ into the matrix lattice, it exhibits an emission band centered at 508 nm when excited by 365 nm ultraviolet light, which is induced by the 4f65d1→4f7 transition of Eu2+ ions. The optimal doping concentrations of Eu2+ and Nd3+ were determined to be 2% and 1%, respectively. Based on X-ray diffraction (XRD) analysis, we have found that the physical phase was not altered by the doping of Eu2+ and Nd3+. Then, we analyzed and compared the quantum yield, fluorescence lifetime, and afterglow decay time of the samples; the co-doped ion Nd3+ itself does not emit light, but it can serve as an electron trap center to collect a portion of the electrons produced by the excitation of Eu2+, which gradually returns to the ground state after the excitation stops, generating an afterglow luminescence of about 15 s. The quantum yields of SrAl2O4:Eu2+ and SrAl2O4:Eu2+, Nd3+ phosphors were 41.59% and 10.10% and the fluorescence lifetimes were 404 ns and 76 ns, respectively. In addition, the Eg value of 4.98 eV was determined based on the diffuse reflectance spectra of the material, which closely matches the calculated bandgap value of SrAl2O4. The material can be combined with polyacrylic acid to create optical anti-counterfeiting ink, and the butterfly and ladybug patterns were effectively printed through screen printing; this demonstrates the potential use of phosphor in the realm of anti-counterfeiting printing.

Interplay of valley, layer and band topology towards interacting quantum phases in moiré bilayer graphene

In Bernal-stacked bilayer graphene (BBG), the Landau levels give rise to an intimate connection between valley and layer degrees of freedom. Adding a moiré superlattice potential enriches the BBG physics with the formation of topological minibands — potentially leading to tunable exotic quantum transport. Here, we present magnetotransport measurements of a high-quality bilayer graphene–hexagonal boron nitride (hBN) heterostructure. The zero-degree alignment generates a strong moiré superlattice potential for the electrons in BBG and the resulting Landau fan diagram of longitudinal and Hall resistance displays a Hofstadter butterfly pattern with a high level of detail. We demonstrate that the intricate relationship between valley and layer degrees of freedom controls the topology of moiré-induced bands, significantly influencing the energetics of interacting quantum phases in the BBG superlattice. We further observe signatures of field-induced correlated insulators, helical edge states and clear quantizations of interaction-driven topological quantum phases, such as symmetry broken Chern insulators.

Skin Rash with Acute Respiratory Distress Syndrome in Chronic Miliary Tuberculosis: The Role of HRCT Thorax and Bronchoscopy as Diagnostic Tools

Pulmonary tuberculosis (TB) is a leading cause of mortality and morbidity in India, presenting with diverse clinical and radiological manifestations such as consolidation, cavitation, lymphadenopathy, pleural effusion, miliary TB, and endobronchial TB. While acute miliary TB presenting as Acute respiratory distress syndrome (ARDS) is documented, the association with a skin rash mimicking viral exanthematous fever is not. This case report describes the case of a 41-year-old male patient with acute dyspnea, a maculopapular rash, and lung infiltrates on chest radiograph, initially diagnosed with acute hypoxic respiratory failure and later confirmed as ARDS. High-resolution computed tomography (HRCT) thorax revealed consolidation with nodules and a characteristic butterfly pattern sparing the apices and bases. Bronchoscopy confirmed TB etiology through MTB genome in BAL samples. The patient improved significantly with intravenous antibiotics, steroids, and HFNC, leading to a documented cure after 6 months of anti-tuberculosis treatment. This report highlights the importance of considering TB in cases with nodular consolidation and positive limiting signs and recommends ICU bronchoscopy as a reliable diagnostic tool. The Kigali modification for ARDS definition was instrumental in managing this case. Use of Kigali modification for defining ARDS in resource limited setting guided management in our case.

Using Multimodal Imaging to Refine the Phenotype of PRPH2-associated Retinal Degeneration

To refine retinal peripherin-2 (PRPH2)-associated retinal degeneration (PARD) phenotypes using multimodal imaging. Retrospective review of clinical records and multimodal imaging. Patients who visited the inherited retinal degeneration (IRD) clinic at 2 tertiary referral eye centers with molecularly confirmed IRD due to PRPH2 variants. Retinal imaging was reviewed using ultrawidefield (UWF) pseudocolor, UWF fundus autofluorescence, and spectral-domain OCT. Phenotypes were identified in the macular or peripheral region. A combined phenotype was considered if any phenotypes were present in both macular and peripheral regions. Mixed phenotypes in the macula or peripheral retina were considered if there were 2 distinct phenotypes identified in the same eye. The presence or absence of atrophy in the macular or peripheral area was also noted. Grading of multimodal imaging by phenotype and atrophy. A total of 144 eyes of 72 patients were included in this study. The majority of the eyes had combined macular and peripheral phenotypes (89/144, 61.8%), whereas 44 (30.6%) eyes had isolated macular findings, and 11 (7.6%) had isolated peripheral findings. Twenty-five eyes were classified with mixed macular phenotypes, whereas fundus flavimaculatus dystrophy type was the most common combined macular and peripheral phenotype (54/144, 37.5%): n= 10 with macular dystrophy and macular flavimaculatus dystrophy (MFD), and n= 15 with butterfly pattern dystrophy and MFD. Nearly half of the eyes (71/144, 49.3%) were identified to have concomitant outer retinal atrophy. Fundus flavimaculatus type dystrophy was also associated with the highest proportion of concomitant atrophy (57/71, 80.3%). Peripherin-2-associated retinal degeneration demonstrates a wide array of phenotypes using multimodal imaging. We report that combinations of classically described phenotypes were often seen. Additionally, macular and peripheral atrophy were often associated with PARD phenotypes. Refinement of PARD phenotypes using newer multimodal imaging techniques will likely assist diagnosis and future clinical trials. Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.

Different diversity patterns of butterfly and moth assemblages between deciduous and evergreen broad-leaf forests

In this study, we compared the diversity and abundance of two groups of Lepidopteran insects—butterflies and moths—across deciduous (DBL) and evergreen broad-leaved (EBL) tree communities in warm temperate forests. Over three years (from 2018 to 2020) at the Wando Arboretum, we used transect and point methods to sample butterflies and light traps to sample moths. Our findings revealed that the total estimated species richness was higher in EBL compared to DBL. Non-metric multidimensional scaling (NMDS) analysis confirmed distinct moth assemblages between the two tree communities, while butterfly assemblages did not exhibit such separation. The seasonal diversity patterns of butterflies in both forests differed significantly, whereas those of moths exhibited a similar trend with a peak in June. Beta diversity components indicated high turnover rates in moth assemblages across both tree communities and high nestedness in butterfly assemblages within the DBL. Although the diet breadth of butterflies and moths did not significantly differ between the two tree communities, the number of butterfly species per host plant was higher in DBL and that of moths was higher in EBL. Considering the ongoing vegetation transition from DBL to EBL, changes in forest structure—such as canopy openness and tree density—may adversely impact insect communities within DBL.

Infall Motions in the Hot Core Associated with the Hypercompact H ii Region G345.0061+01.794 B

We report high angular resolution observations, made with the Atacama Large Millimeter Array in band 6, of high excitation molecular lines of CH3CN and SO2 and of the H29α radio recombination line toward the G345.0061+01.794 B HC H ii region in order to investigate the physical and kinematical characteristics of its surroundings. Emission was detected in all observed components of the J = 14 →13 rotational ladder of CH3CN and in the 304,26–303,27, and 324,28–323,29 lines of SO2. The peak of the velocity-integrated molecular emission is located ∼0.″4 northwest of the peak of the continuum emission. The first-order moment images and channel maps show a velocity gradient of 1.1 km s−1 arcsec−1 across the source and a distinctive spot of blueshifted emission toward the peak of the zero-order moment. The rotational temperature is found to decrease from 252±24 K at the peak position to 166±16 K at its edge, indicating that our molecular observations are probing a hot molecular core that is internally excited. The emission in the H29α line arises from a region of 0.″65 in size, where its peak coincides with that of the dust continuum. We model the kinematical characteristics of the “central blue spot” feature as due to infalling motions, suggesting a central mass of 172.8±8.8 M ⊙. Our observations indicate that this HC H ii region is surrounded by a compact structure of hot molecular gas, which is rotating and infalling toward a central mass, that is most likely confining the ionized region. The observed scenario is reminiscent of a “butterfly pattern” with an approximately edge-on torus and ionized gas roughly parallel to its rotation axis.

Research on the Characteristics of Figure Round Pattern in Qing Dynasty

Round pattern, also known as round nest pattern. It is one of the most common patterns in ancient China, that is, symmetrical radial or rotating round decorative patterns around. Such patterns are often found on ancient bronze ware, ceramics, weaving and embroidery products, and modern silk fabrics. Round pattern is an important part of the study of Chinese costume patterns, which contains the cultural concepts that Chinese people yearning for perfection, auspiciousness, reunion, harmony and beauty. Cloud bat pattern, rich and noble peony pattern, colorful cloud pattern, sitting dragon pattern, phoenix pattern, butterfly pattern, and so on, the subject matter is numerous. Central symmetry type, Tai Chi type corresponding type, rotary radiation type, asymmetric flower type, and so on, the style is rich. Among them, the Qing Dynasty appeared a round pattern with character stories and relatively free composition. The pattern of the character round has unique characteristics of the Times. On the basis of the aesthetic feeling of the round flower form, it integrates the plot of the characters, reflecting the characteristics of the social customs and aesthetic taste at that time, and establishes a bridge for the traditional pattern and custom illustration.

Research on the Integration of Xiangxi Miao Butterfly Patterns and Modern Cultural and Creative Designs

The Miao people's traditional dress designs in western Hunan strongly reflect their distinct cultural qualities as well as the local community's lifestyle. These patterns are both aesthetically pleasing and culturally significant. As the cultural and creative industries have grown, an increasing number of designers have begun to incorporate these historic motifs into modern cultural and creative items in order to promote and conserve national culture. This research will look at the butterfly pattern of Xiangxi Miao, a representative ornamental feature, and how it might be used to contemporary cultural and creative design. The essay will go into detail on how traditional themes can be blended with modern design aspects, and how this fusion improves the cultural worth and market attractiveness of the items.

제주도 나비의 고도별 분포와 군집에 관한 연구

In order to understand the distribution and community patterns of butterflies on Jeju Island from the coast to Hallasan Mountain by altitude, were divided into 0~200m, 200~750m, 750~1,100m, and 1,100~1,900m, and 3 times a month from 2022 to 2023, a total of 21 investigated. A total of 36,179 butterflies identified in this survey were 5 families and 65 species. Nymphalidae showed the greatest number of occurrences, with 16,774 individuals and 29 species. The number of species by altitude showed a high frequency of appearance at 50 species between 450 and 750 m, and the largest number of individuals was below 200 m, where 10,880 species appeared. By month, it was confirmed that the largest number of species and individuals appeared in July (59 species) and August (8,634 individuals). As a result of cluster analysis according to altitude, the low mountain range (750m) and below was analyzed to have high diversity, evenness, and richness index. By month, July was analyzed to have the highest diversity and richness index. As a result of cluster analysis, butterflies in Jeju Island were divided into distribution types of 0~750m, 750~1,500m, and 1,500~1,900m, and butterflies appear in the subalpine zone has been raised to over 1,500m. This study will serve as basic data for future predictions of changes in the community structure of Jeju Island butterflies by altitude due to butterfly habitat environment and climate change.

Pervasive mimicry in flight behavior among aposematic butterflies

Flight was a key innovation in the adaptive radiation of insects. However, it is a complex trait influenced by a large number of interacting biotic and abiotic factors, making it difficult to unravel the evolutionary drivers. We investigate flight patterns in neotropical heliconiine butterflies, well known for mimicry of their aposematic wing color patterns. We quantify the flight patterns (wing beat frequency and wing angles) of 351 individuals representing 29 heliconiine and 9 ithomiine species belonging to ten color pattern mimicry groupings. For wing beat frequency and up wing angles, we show that heliconiine species group by color pattern mimicry affiliation. Convergence of down wing angles to mimicry groupings is less pronounced, indicating that distinct components of flight are under different selection pressures and constraints. The flight characteristics of the Tiger mimicry group are particularly divergent due to convergence with distantly related ithomiine species. Predator-driven selection for mimicry also explained variation in flight among subspecies, indicating that this convergence can occur over relatively short evolutionary timescales. Our results suggest that the flight convergence is driven by aposematic signaling rather than shared habitat between comimics. We demonstrate that behavioral mimicry can occur between lineages that have separated over evolutionary timescales ranging from <0.5 to 70 My.

Species richness and dispersion patterns of Lepidoptera (Rhopalocera) in the Nuraksa Forest Park, Lombok, Indonesia

Abstract. Ilhamdi ML, Idrus AA, Santoso D, Hadiprayitno G, Syazali M, Hariadi I. 2023. Species richness and dispersion patterns of Lepidoptera (Rhopalocera) in the Nuraksa Forest Park, Lombok, Indonesia. Biodiversitas 25: 62-70. Butterflies play an important role in maintaining the balance of ecosystems and pollinators. This study aims to analyze the species richness and dispersion patterns of butterflies from the Rhopalocera suborder in this area. The field survey was carried out from January to July 2023. The sampling site was divided into six areas. Specimens that were successfully collected using a hand net were identified at the Biological Laboratory of Mataram University. During this survey, 1576 specimens of Rhopalocera were recorded. This number consists of 47 species. Several species, such as Junonia atlites Linnaeus, 1763, Junonia almana Linnaeus, 1758, Danaus genutia Cramer, 1779, Hypolimnas misippus Linnaeus, 1764, and Amathusia phidippus Linnaeus, 1763 were found to be new records in the Nuraksa Forest Park area. The habitat types with the highest number of species are the utilization block and the traditional block, with 47 species. The habitat type with the lowest number of species is a special block with only 15 species. However, the highest species richness was found in the protection block, with an R-value of 8.09. The most dominant species is Leptosia nina Fabricius, 1793, and the least dominant is A. phidippus. Each species depicted a varying distribution in the six habitat types. According to the analysis results, it was found that the dispersion pattern of all Rhopalocera species is clustered. The research results themselves contribute to conservation and ecotourism efforts.

The Artistic Characteristics and Symbolism of the Butterfly Pattern in Nanjing Yunjin

The Artistic Characteristics and Symbolism of the Butterfly Pattern in Nanjing Yunjin

Macroecological patterns in European butterflies unveil strong interrelations between larval diet breadth, latitudinal range size and voltinism

Diet breadth is one of the fundamental species traits of an herbivorous insect as it strongly determines its ecological niche and, at the same time, its ability to cope with changing environmental conditions. To what extent this trait is associated with other characteristics that may influence a species' ability to respond to environmental changes, however, is yet poorly understood. Using European butterflies as a model group of holometabolous insect herbivores, we here tested whether larval diet breadth is positively related with latitudinal range size (i.e. north–south extent of global distribution), voltinism and adult body size. We further investigated whether range size, voltinism, and body size are associated with each other. In order to test for these relationships, we based our analyses on a solid, time‐calibrated butterfly phylogeny as well as on an updated host plant database that reflects interactions between butterfly larvae and their food plants in a yet unparalleled breadth and depth. We further calculated two measures to reflect the fundamental dietary niche of a species: taxonomic diet breadth and phylogenetic diet breadth. Irrespective of diet breadth measure, we found that diet breadth increases with latitudinal range size. We further found an overall higher diet breadth for species that are capable to realise multiple broods per year (i.e. multivoltine species) compared to obligatorily univoltine species. Contrary to expectation, our results indicated a negative relationship between larval diet breadth and adult body size. Regarding our explorative analyses, we observed a positive link between voltinism and latitudinal range size, while neither one of these variables was associated with body size. Taken together, our study shows that larval diet breadth, latitudinal range size and voltinism are positively linked in European butterflies, and we argue that these interrelationships are important in determining a species' overall potential to cope with changing environmental conditions.

Hydrodynamics of Butterfly-Mode Flapping Propulsion of Dolphin Pectoral Fins with Elliptical Trajectories.

This article aims to numerically study the hydrodynamic performance of the bionic dolphin equipped with a pair of rigid pectoral fins. We use dynamic-grid technology and user-defined functions to simulate a novel butterfly-mode flapping propulsion of the fins. This pattern of propulsion is composed of three angular degrees of freedom including the pitch angle ϕp, the azimuth angle ϕa and the roll angle ϕr, which can be divided into four stages for analysis within a single cycle. The stroke of one single pectoral fin can be approximated as an ellipse trajectory, where the amplitudes of ϕa and ϕp, respectively, determine the major and minor axes of the ellipse. The fluid dynamics involved in the specific butterfly pattern is mathematically formulated, and numerical simulation is conducted to investigate the propulsion quantitatively. The results show that the dolphin with a higher water striking frequency f can acquire higher propulsion speed and efficiency. Furthermore, the shape of the ellipse trajectory under different conditions could also have different propulsion effects. The periodic generation and disappearance of vortex structures in the butterfly flapping mode show the evolution process of fluid flow around a pair of pectoral fins, which reveals the influence of motion parameters on fluid dynamics under different working conditions.

An automated earthquake classification model based on a new butterfly pattern using seismic signals

BackgroundSeismic signals are useful for earthquake detection and classification. Therefore, various artificial intelligence (AI) models have been used with seismic signals to develop automated earthquake detection systems. Our primary goal is to present an accurate feature engineering model for earthquake detection and classification using seismic signals. Material and modelWe have used a public dataset in this work containing three categories: (1) noise, (2) P waves, and (3) S waves. P and S waves are used to define earthquakes. We have presented two applied use cases using this dataset: (i) earthquake detection and (ii) wave classification. In this work, a new textural feature extractor has been presented by using a graph pattern similar to a butterfly. Thus, this feature extraction function is named Butterfly pattern (BFPat). We have created a new feature engineering architecture by deploying BFPat, statistics, and wavelet packet decomposition (WPD) functions. The recommended BFPat and statistics have been applied to the wavelet bands created by WPD and the raw seismic signals. Multilevel features have been extracted from both frequency and space domains. The used dataset contains signals with three channels. Using these three channels, seven signals have been created. Seven feature vectors have been created from 7 input signals used in this study. The most meaningful/informative features from the generated feature set are then selected using the iterative neighborhood component analysis feature selector method. Seven chosen feature vectors have been considered as inputs of the two shallow classifiers: k nearest neighbors (kNN) and support vector machine (SVM). A total of 14 (=7 × 2) results have been obtained in the classification phase. A majority voting process was applied in the last phase to choose the best results and improve the classification performance. ResultsWe have presented two use cases for our new BFPat method in this work to obtain superior results. Our model reached an accuracy of 99.58% in detecting the earthquake detection and 93.13% accuracy in 3-class classifications of waves. ConclusionsOur recommended model has achieved over 90% classification performance for both cases. Also, we have presented the most valuable channel and combinations in our work. Our developed system is ready to be tested with a bigger database.

Introduction pages, Nova Geodesia 3(3), 2023

Nova Geodesia (https://novageodesia.ro), Issue 3, Volume 3, 2023: The papers published in this issue represent interesting novelties in different topics of geodetic science or related fields. Nova Geodesia publishes significant papers in geodesy and close topics related to cartography, engineering projects and construction, planetology, hydrography, geography, sociodemographic factors, urban administration, planning and environment, landscape, biodiversity, and ecology. Among the exciting articles, we invite readers to find news about: Artificial Intelligence (AI) – based strategies for point cloud data and digital twins; Temporal distribution pattern of butterflies in an unfenced location at Serampore, Hooghly, West Bengal, India; Contribution of the GIS in the assessment of the urbanization challenges and the impact on the ecosystems: The case study of El Fqih Ben Saleh city, Tadla Plain, Morocco.

The persistence of magneto-rotational turbulence in gravitationally turbulent accretion disks

Aims. Our main goal is to probe the persistence of turbulence originating from the magneto-rotational instability (MRI) in gravito-turbulent disks. This state is referred to here as GI-MRI coexistence, with GI standing for gravitational instability. We test the influence of GI strength, controlled by the cooling law, and the impact of Ohmic resistivity. Methods. Our starting point was three-dimensional, ideal, magnetohydrodynamic (MHD) simulations of gravitational turbulence in the local shearing-box approximation using the code Athena. We introduced a zero-net-flux magnetic seed field in a GI-turbulent state and investigated the nonlinear evolution. The GI strength was varied by modifying the cooling parameters. We tested the cooling times τcΩ0 = 10, τcΩ0 = 20, and τcΩ0 = 10, with additional background heating. For some resistive cases, ideal-MHD simulations, which had already developed GI-MRI coexistence, were restarted with a finite Ohmic resistivity enabled at the moment of restart. Results. It appears that there are two possible saturated dynamo states in the ideal-MHD regime: a state of GI-MRI coexistence (for low GI activity) and a strong-GI dynamo. The cases with lower GI activity eventually develop a clearly visible butterfly pattern. For the case with the highest GI activity (τcΩ0 = 10, no heating), a clearly visible butterfly pattern is absent, though more chaotic field reversals are observed above (and below) the mid-plane. We were also able to reproduce the results of previous simulations. With Ohmic resistivity, the simulation outcome can be substantially different. There exists a critical magnetic Reynolds number, ⟨Rm⟩ ∼ 500, below which the ideal-MHD outcome is replaced by a new dynamo state. For larger Reynolds numbers, one recovers turbulent states that are more reminiscent of the ideal-MHD states, and especially the strong-GI case. This new state leads to oscillations, which are caused by a significant heat production due to the resistive dissipation of magnetic energy. The additional heat periodically quenches GI, and the quenching events correspond to maxima of the Toomre value, Q.