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15 results for “voltinism”
Data from: Two-year bee, or not two-year bee? How voltinism is affected by temperature and season length in a high-elevation solitary bee
Organisms must often make developmental decisions without complete information about future conditions. This uncertainty—for example, about the duration of conditions favorable for growth—can favor bet-hedging strategies. Here, we investigated the causes of life-cycle variation in Osmia iridis, a bee exhibiting a possible bet-hedging strategy with co-occurring one- and two-year life cycles. One-year bees reach adulthood quickly but die if they fail to complete pupation before winter; two-year bees adopt a low-risk, low-reward strategy of postponing pupation until the second summer. We reared larval bees in incubators in various experimental conditions and found that warmer—but not longer—summers, and early birth dates, increased the frequency of one-year life cycles. Using in situ temperature measurements and developmental trajectories of laboratory- and field-reared bees, we estimated degree-days required to reach adulthood in a single year. Local long-term (1950–2015) climate records reveal that this heat requirement is met in only ~7% of summers, suggesting that the observed distribution of life cycles is adaptive. Warming summers will likely decrease average generation times in these populations. Nevertheless, survival of bees attempting one-year life cycles—particularly those developing from late-laid eggs—will be <100%; consequently, we expect the life-cycle polymorphism to persist.
Phenological responses to climate warming in temperate moths and butterflies: species traits predict future changes in voltinism
Changes in the number of generations per year (voltinism) have been among the most common phenological responses to climate warming in insects inhabiting seasonal environments. Nevertheless, numerous species have maintained univoltine (one generation per year) phenology with increasing temperatures, indicating the involvement of phylogenetic, ecological or some other constraints on phenological change. I examined geographic variation in voltinism in moths and butterflies of Northern Europe to identify species traits that might predispose species to univoltine/multivoltine phenology. I focused on species with a wide latitudinal distribution range (15 degrees as a minimum) which makes it unlikely that constraints imposed by season length could preclude multivoltinism across their distribution. Almost half of the 731 moth and butterfly species considered appear to have a single generation throughout their entire European range. A univoltine life-cycle across a wide latitudinal gradient suggests the presence of some constraint that makes additional generations either impossible or at least strongly disadvantageous, which will unlikely change with future climate warming. The scattered distribution of univoltine and multivoltine species across the lepidopteran phylogeny indicates that phylogenetic constraints are not strongly limiting changes in voltinism, and the trait is open to ecologically-driven adaptive evolution. My data show that species with one generation per year are generally larger than multivoltine species, but size forms no absolute constraint to having multiple generations per year. Obligately univoltine species dominate among egg and adult overwinterers (life-histories typical of so-called spring-feeders), whereas species with capacity for multiple generations prevail among pupal overwinterers. Multivoltinism is also infrequent among species feeding on grasses, particularly in endophagous grass-feeders. Larval diet breadth has no discernible effect on voltinism. Given the diverse ecological consequences of voltinism and its changes, accounting for the species' capacity for multivoltinism may be a key to address future challenges in biodiversity conservation and pest management.
Influence of Altitudinal Gradient on the Voltinism and Generation Time of Cydia pomonella (Lepidoptera: Tortricidae) in walnut trees in northwestern Argentina
<p><span><span>11-<span> </span></span></span><em><span>Cydia pomonella L</span></em><span>. causes significant economic loss in the global fruit-growing industry. Its biology is influenced by environmental factors which have an impact on its voltinism in relation to its habitat.</span></p> <p><span>22- <span>The influence of the altitudinal gradient on the number and duration of <em>C. pomonella</em> populations on walnut trees grown at latitudes below 29° was determined. The relation between temperature and population curves was evaluated by an altitudinal gradient.</span></span></p> <p><span><span>33- </span></span><span><span><span> </span></span></span><span>A higher number of generations was quantitatively recorded in a shorter time on orchards located at lower altitudes. Walnut trees grown at higher altitudes, with lower temperatures, showed less pest pressure. The “Predictive Extension Timing Estimator”, used in several regions for the management of <em>C. pomonella</em>, does not accurately predict the length of the generation time in plantation crops at lower altitudes, requiring further studies in this area.</span></p> <p><span>44- </span><span>The results are relevant for designing of management strategies for walnut trees grown at latitudes below 29°, where environmental conditions differ considerably from other latitudes that were studied, impacting on the population dynamics of <em>C. pomonella</em>.</span></p> <p> </p>
Voltinism and life-history traits of the invasive fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae) feeding on corn
<p>Voltinism and life-history traits of the invasive fall armyworm (FAW) <em>Spodoptera frugiperda</em> were investigated under semi-natural conditions for a period of two years. The FAW invaded the corn field in the suburbs of Nanchang (28° 46′ N, 115° 50′ E) in early summer and produced six complete generations. The FAW had the characteristics of short developmental time, high survival rates and strong fecundity. The development time of female pupae was significantly faster than that of male pupae, resulting in the emergence of female pupae earlier than male pupae. Except for the sixth generation in 2021, there was no significant difference between female and male sex ratio, which was close to 1:1. The FAW showed male-bias sexual size dimorphism with male pupae being significantly larger than female pupae. Unlike pupal weight, in most generations, male adult weighed significantly less than females, because the weight loss of male pupae during metamorphosis was significantly greater than that of female pupae. The seasonal variation of pupal weight did not conform to the temperature–size rule. Compared with 22.8 °C, the 29.2 °C high temperature not only significantly reduced the development time of larvae but also significantly increased pupal weight. The adult fecundity feeding on fresh corn leaves was higher than that feeding on live corn plants in most generations. In most generations, pupal weight was positively correlated with larval development time and adult weight was positively correlated with fecundity. These results add to the understanding of the evolution of life-history traits in the FAW and may have important implications for predicting population dynamics of the FAW and optimizing control strategies.</p>
Phenological responses to climate warming in temperate moths and butterflies: species traits predict future changes in voltinism
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Data from: Two-year bee, or not two-year bee? How voltinism is affected by temperature and season length in a high-elevation solitary bee
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Variation in butterfly diapause duration in relation to voltinism suggests adaptation to autumn warmth, not winter cold
<p>1. The life cycles of animals vary in relation to local climate, as a result of both direct environmental effects and population-level variation in plastic responses. Insects often respond to the approach of winter by entering diapause, a hormonally programmed resting state where development is suspended and metabolism suppressed. Populations often differ in the duration of diapause, but the adaptive reasons for this are unclear.</p> <p>2. We performed a common-garden overwintering experiment with respirometric measurements in order to investigate the progression of diapause in the butterfly Pararge aegeria. Both the duration of diapause and the depth of metabolic suppression were shown to vary between populations.</p> <p>3. In contrast to previous results from various insects, diapause duration did not correspond to the local length of winter. Instead, the observed pattern was consistent with a scenario in which diapause duration is primarily a product of selection for suppressed metabolism during warm autumn conditions. The relationship between optimal diapause duration and the length of the warm season is complicated by variation in the number of yearly generations (voltinism).</p> <p>4. These results shed new light on variation in diapause ecophysiology, and highlight voltinism as an integrated product of selection at multiple points in the seasonal cycle.</p>
Influence of voltine ecotype and geographic distance on genetic and haplotype variation in the Asian corn borer
<p>Diapause is an adaptive dormancy strategy by which arthropods endure extended periods of adverse climatic conditions. Seasonal variation in larval diapause initiation and duration in the Asian corn borer, <i>Ostrinia furnacalis</i>, influences adult mating generation number (voltinism) across local environmental conditions. Degree of mating period overlap between sympatric voltinism ecotypes influence hybridization level, but impact on <i>O. furnacalis</i> population genetic structure and evolution of divergent adaptive phenotypes remains uncertain. Genetic differentiation was estimated between voltinism ecotypes collected from 8 locations in Jilin Province, China [3 single generation (univoltine), 3 two generation (bivoltine), and 2 sympatric locations] in 2014. Bayesian and phylogenetic clustering partitioned mitochondrial cytochrome <i>c</i> oxidase subunit I (COI) haplotypes mostly into groups corresponding to historically uni- or bivoltine population origins, whereas samples from sympatric locations were interspersed between voltinism-specific clusters. Additionally, analyses of single nucleotide polymorphism (SNP) genotype data implicate voltinism, as opposed to geographic distance, as a factor contributing to differentiation among sample site. Temporal analysis of SNP genotypes from a sympatric location showed significant variation between adult moths collected within non-overlapping periods corresponding to bivoltine and univoltine flights. Regardless, only 11 of 257 SNP loci were predicted to be under selection, suggesting population genetic homogenization except at loci in proximity to factors responsible for locally adaptive or voltinism-specific traits. These findings provide evidence that divergent voltinism ecotype-specific traits and mitochondrial haplotypes may be maintained in allopatric as well as sympatric areas despite relatively high rates of nuclear gene flow.</p>
Macroecological patterns in European butterflies unveil strong interrelations between larval diet breadth, latitudinal range size, and voltinism
<p>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 of realising 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.</p>
Macroecological patterns in European butterflies unveil strong interrelations between larval diet breadth, latitudinal range size, and voltinism
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Variation in butterfly diapause duration in relation to voltinism suggests adaptation to autumn warmth, not winter cold
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Influence of voltine ecotype and geographic distance on genetic and haplotype variation in the Asian corn borer
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Data from: Latitudinal and voltinism compensation shape thermal reaction norms for growth rate
Latitudinal variation in thermal reaction norms of key fitness traits may inform about the response of populations to climate warming, yet their adaptive nature and evolutionary potential is poorly known. We assessed the contribution of quantitative genetic, neutral genetic and environmental effects to thermal reaction norms of growth rate for populations of the damselfly Ischnura elegans. Among populations, reaction norms differed primarily in elevation suggesting that time constraints associated with shorter growth seasons in univoltine, high-latitude as well as multivoltine, low-latitude populations selected for faster growth rates. Phenotypic divergence among populations is consistent with selection rather than drift as QST was greater than FST in all cases. QST estimates increased with experimental temperature and were influenced by genotype by environment interactions. Substantial additive genetic variation for growth rate in all populations suggests that evolution of trait means in different environments is not constrained. Heritability of growth rates was higher at high temperature, driven by increased genetic rather than environmental variance. While environment-specific non-additive effects also may contribute to heritability differences among temperatures, maternal effects did not play a significant role (where these could be accounted for). Genotype by environment interactions strongly influenced the adaptive potential of populations, and our results suggest the potential for microevolution of thermal reaction norms in each of the studied populations. In summary, the observed latitudinal pattern in growth rates is adaptive and results from a combination of latitudinal and voltinism compensation. Combined with the evolutionary potential of thermal reaction norms, this may affect populations' ability to respond to future climate warming.
Emergence timing and voltinism of phantom midges, Chaoborus spp., in the UK., supplementary data
<p>Supporting water quality, environmental and biological data for draft manuscript.</p>
Data from: Latitudinal and voltinism compensation shape thermal reaction norms for growth rate
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