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"Butterflies Behavior."
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Butterflies of the world
\"In the book's opening chapters, Hoskins describes the evolution, anatomy, lifecycle, ecology, and taxonomy of the world's butterflies. The second half of the book offers comprehensive coverage of every butterfly family, along with fascinating accounts of butterfly behavior. Readers of all backgrounds will be delighted and informed by interesting facts and stories about Lepidoptera, from the spectacular Tiger Swallowtail, Blue Morpho, and Tibetan Glory, to the legendary Giant Birdwings and the cryptic Variegated Rajah, Amber Phantom, and Scarlet-eyed Skipper. Many books about these beloved creatures focus exclusively on photos of butterflies, with little accompanying text and scant scientific value. However, in this book, Hoskins provides a scientifically rigorous introduction to butterflies that is suitable for both laypersons and professionals. Lepidopterists will benefit from the unique and extensive taxonomically based survey, while enthusiastic amateurs will learn more about butterfly biology without being overwhelmed by jargon...\"--Dust jacket.
Book
Predation favours Bicyclus anynana butterflies with fewer forewing eyespots
There are fewer eyespots on the forewings versus hindwings of nymphalids but the reasons for this uneven distribution remain unclear. One possibility is that, in many butterflies, the hindwing covers part of the ventral forewing at rest and there are fewer forewing sectors to display eyespots (covered eyespots are not continuously visible and are less likely to be under positive selection). A second explanation is that having fewer forewing eyespots confers a selective advantage against predators. We analysed wing overlap at rest in 275 nymphalid species with eyespots and found that many have exposed forewing sectors without eyespots: i.e. wing overlap does not constrain the forewing from having the same number or more eyespots than the hindwing. We performed two predation experiments with mantids to compare the relative fitness of and attack damage patterns on two forms of Bicyclus anynana butterflies, both with seven hindwing eyespots, but with two (in wild-type) or four (in Spotty) ventral forewing eyespots. Spotty experienced more intense predation on the forewings, were shorter-lived and laid fewer eggs. These results suggest that predation pressure limits forewing eyespot number in B. anynana. This may occur if attacks on forewing eyespots have more detrimental consequences for flight than attacks on hindwing eyespots.
Journal Article
Indigenous forest edges increase habitat complexity and refuge opportunities for grassland butterflies
Heterogeneity at local and landscape scales can promote insect diversity and moderate insect declines that stem from global change. Determining how species respond to different landscape components provides insight into the role of heterogeneity in landscapes undergoing change. We examine how indigenous forest-grassland edges are used by butterflies. We assessed butterfly diversity and behaviour at forest edges and adjoining grassland, and tested whether these patterns are influenced by differing weather conditions between seasons. Forest edges supported a species rich butterfly assemblage. Forest specialists were more diverse at forest edges than in grassland, whereas grassland specialists and habitat generalists were as diverse at forest edges as in grassland. All butterfly groups showed more inter- and intra-specific interactions and more patrolling behaviour at forest edges, but more feeding and transient behaviour in grassland. Occurrence and behavioural patterns were not mediated by season, suggesting that the influence of forests does not change with varying environmental conditions. Nonetheless, certain species preferentially utilized forest edges in the hot and windy season, indicating that shelter provided by forest edges influences butterfly habitat use. We found no evidence that complementary nectar sources influence butterfly distribution patterns.
Implications for insect conservation
: The diverse butterfly assemblages and range of behaviours supported by indigenous forest edges indicate that forest patches are an important habitat component for butterflies. Conserving forest patches in these coastal grasslands may help buffer butterfly populations against global change.
Journal Article
Within-habitat vegetation structure and adult activity patterns of the declining butterfly Euphydryas aurinia
BackgroundEuphydryas aurinia is a declining butterfly inhabiting oligotrophic grasslands in Central and Western Europe. Despite numerous ecological studies, patterns of its adult activity have so far been rather neglected, although adult resource use contributes to resource-based understanding of insects’ habitats.AimTo relate E. aurinia adult activity patterns to within-habitat vegetation structures.Methods(1) Timed adult activity observations along a transect crossing a colony site, analysed via partial ordination methods. (2) Activity records obtained during mark-recapture, analysed via binomial regressions.ResultsBoth methods, besides influences of weather, time of day (similarities between morning and late afternoon hours), and progression of season (mate locating replaced by maintenance activities), revealed consistent association of behaviours to vegetation structures. Of the two male mate-locating behaviours, perching occurred near shrubs and woodland edges, and patrolling over centres of inhabited meadows. Female activity concentrated in nectar-rich mid-height sward near host plants. Consequently, male and female activity were partly spatially separated.Implications for conservationA habitat for E. aurinia should provide resources for all its activities in close proximity. Grasslands containing host plants should be dissected by structures such as shrubs, woodlot edges, or taller herbaceous vegetation, emphasising the importance of landscape heterogeneity for insect fauna.
Journal Article
Do Butterfly Activity Data from Mark-Recapture Surveys Reflect Temporal Patterns?
Temporal patterns in butterfly behavior should reflect diurnal, seasonal and population-level changes in mate availability. Investment into mating should peak at times when potential mates are at a maximum; at other times, individuals should save energy and focus on maintenance activities. To explore these assumptions, we re-analyzed mark-recapture data containing records of behavior for each handled individual: 15 species, 21 separate datasets, total of 20,828 activity records (13,223 males and 7605 females). We used ordination analysis, with activity categories as response variables and controls for dataset identity and weather effects. Across species, basking and nectaring were prevailing morning activities, while mating peaked at afternoons. With the progressing season, males switched from maintenance behavior to mating activities, whereas opposite trend applied to females. Density predictors (sex ratio, daily population size) revealed that mating concentrated to high densities of the opposite sex and that female oviposition, resting and nectaring increased under low density of males. Exploring mark-recapture data for studying behavioral patterns proved to be fruitful but cannot replace focused observations or experiments.
Journal Article
Dispersibility of the Pale Grass Blue Butterfly Zizeeria maha (Lepidoptera: Lycaenidae) Revealed by One-Individual Tracking in the Field: Quantitative Comparisons between Subspecies and between Sexes
The pale grass blue butterfly Zizeeria maha (Lepidoptera: Lycaenidae) has been used as an environmental indicator species for radioactive pollution after the Fukushima nuclear accident. Here, based on the one-individual tracking method in the field, we examined dispersal-associated and other behavioral traits of this butterfly, focusing on two subspecies, Z. maha argia in mainland Japan and Z. maha okinawana in Okinawa. The accumulated distances in the adult lifespan were 18.9 km and 38.2 km in mainland and Okinawa males, respectively, and 15.0 km and 7.8 km in mainland and Okinawa females, respectively. However, the mean distance from the starting point was only 24.2 m and 21.1 m in the mainland and Okinawa males, respectively, and 13.7 m and 7.4 m in the mainland and Okinawa females, respectively. Some quantitative differences in resting and feeding were found between subspecies and between sexes. The ARIMA (autoregressive integrated moving average) model indicated that the dispersal distance was 52.3 m (99% confidence interval value of 706.6 m) from the starting point in mainland males. These results support the idea that despite some behavioral differences, both subspecies of this butterfly are suitable as an environmental indicator because of the small dispersal ranges.
Journal Article
Floral Preferences of Butterflies Based on Plant Traits: A Case Study in the National Botanical Garden, Godawari, Nepal
Butterflies have nectar-feeding preferences based on various floral characteristics, including flower shape, size, color, fragrance, and nectar composition, which in turn affect their survival, reproduction, and roles in pollination. The National Botanical Garden (NBG) in Lalitpur, Nepal, holds a variety of flowering plants and butterfly populations, providing a suitable study site to test the hypotheses on floral preferences of butterflies. This study assessed the floral preferences of the butterfly community in the NBG based on flower color, the origin of flowering plants (native and alien), and the type of plants (herbs and shrubs). It also tested the association between butterfly proboscis lengths and corolla tube lengths of flowers. Data were collected from 10 blocks (each 5 × 5 m2) through direct observation during the spring and autumn seasons, from March to October 2022. A total of 24 species of butterflies were recorded during the study period, with the chocolate pansy (Junonia iphita) being the most abundant. The relative abundance of pink flowers was higher in the NBG, but the butterflies’ visitation frequency was significantly higher on yellow flowers (p < 0.05) than on other colors. The visitation frequencies of butterflies significantly varied with the flowers’ origin and types. Butterflies visited flowers of alien origin more frequently than native ones (p < 0.05) and those of herbs over shrubs (p < 0.05). Flowers from alien plants, such as Calluna vulgaris and Viola tricolor, were among the most frequently visited. The proboscis length of butterflies showed a significantly strong positive correlation with the corolla tube length of flowers (τ = 0.74, p < 0.001). These results can inform conservation practices and garden management strategies aimed at supporting butterfly diversity through the intentional selection of floral resources.
Journal Article
How do adults of the critically endangered hermit butterfly (Chazara briseis) utilise their habitat? (Lepidoptera, Satyrinae)
BackgroundEffective conservation of specialised, endangered species depends on the knowledge of all vital resources they require within species’ lifetime. The butterfly Chazara briseis is endangered throughout Europe, especially so in all states north from the Alps. It depends on large areas of open steppe grassland with short and sparse turf.AimTo identify resource use by adult C. briseis butterflies in relation to vegetation structure within its sites.MethodsWe re-analysed mark-recapture data from the last Czech metapopulation, inhabiting a chain of volcanic hills in Ceske Stredohori highlands and hosting 2000 adults in 2006. We related adult activities observed prior to captures to visually assessed vegetation structures and land cover types obtained from aerial photographs. Additionally, we used land cover types to explore the adults’ home ranges and to compare capture points with randomly selected points.ResultsThe butterflies displayed clearly structured diurnal activity with nectaring from morning to noon and courtship activities and egg-laying in the afternoons. Both sexes used short-sward patches (egg laying, patrolling), but also patches with taller, flower-rich vegetation (mating, nectaring). These results were corroborated using land cover types, however, with much lower explanatory power. Lifetime utilisation of land cover types (home ranges) differed between sexes, females utilised more shrubby and longer-sward areas than males. Randomly selected points within the sites significantly differed from capture points, the latter contained more open, either short or tall grassland patches.Implications for Insect ConservationManagement of inhabited sites must provide open, short-sward patches alternating with flower-rich taller sward and shrubby patches.
Journal Article
Exotic grass invasion impacts fitness of an endangered prairie butterfly, Icaricia icarioides fenderi
Fender’s blue butterfly is an endangered species restricted to fragmented, grassland remnants that are becoming increasingly dominated by tall, invasive grasses in western Oregon, USA. I performed a removal experiment to assess the impacts of structural degradation accompanying the invasion of
Arrhenatherum elatius
, tall oat grass, on butterfly fitness and fitness related behaviors. Clipping of
A. elatius
to native grass sward height resulted in 2.5–5 times as many eggs laid per leaf of host plant. Both male and female butterflies basked more frequently in areas removed of
A. elatius
inflorescences and upon encountering the treatment edge butterflies had a high rate of return into a large area removed of the grass inflorescences. Although butterfly behavior appeared to be affected by the change in sward height on the treatment edge, there was no evidence for the edge causing a disproportionate egg load. Invasion and dominance by
A. elatius
appeared to diminish host plant apparency which may result in overloading of eggs on conspicuous host plants, increased incidence of emigration, and a decrease in the likelihood of colonization because female butterflies appeared indifferent to larval resources beneath
A. elatius
inflorescences. Dominance of natural shortgrass prairies by tall stature grasses like
A. elatius
may be an insidious form of habitat degradation for grassland Lepidoptera worldwide, but it may go largely unnoticed because larval and adult resources can persist under the unnaturally tall grass canopy.
Journal Article
Observations of Everyday Biodiversity
Public involvement is one of the keys to achieving biodiversity conservation goals. Increasing public involvement in conservation activities requires investigation into what makes people more aware of nature, especially in an ordinary and local context, in their everyday lives. Among the initiatives developed to increase the public’s awareness of conservation issues and individual environmental practices, citizen-science programs are based on an invitation to observe and survey nature. In our study, we examined the consequences of participation in a participative citizen-science program that takes place in an everyday-life context on individuals’ knowledge and beliefs about biodiversity. This program, the French Garden Butterflies Watch, is addressed to the non-scientifically literate public and is run by the French National Museum of Natural History (MNHN). We examined the ways increased knowledge or strengthened beliefs or ideas about biodiversity can foster proconservation attitudes and behavior. We explored how repeated interactions with nature influence the development of knowledge in this area, and how these repeated observations of biodiversity become integrated into complex cognitive processes over time and space. We showed that repeated observations of nature can increase individual knowledge and beliefs. Our results brought out three important conclusions: (1) conservation issues must be integrated into a wider network of social relationships; (2) observing everyday nature often makes people consider its functional and evolutionary characteristics; and (3) scientific knowledge seems necessary to help people to develop their own position on ecosystems.
Journal Article