Episodit
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Morpho-ecological aspects on the pollination ofCalotropis procera (Asclepiadaceae) in Israel
Eisikowitch, D. Morpho-ecological aspects on the pollination ofCalotropis procera (Asclepiadaceae) in Israel. Pl Syst Evol 152, 185â194 (1986). https://doi.org/10.1007/BF00989426
The article, published in Plant Systematics and Evolution in 1986, explores the pollination process of the Calotropis procera plant, a member of the Asclepiadaceae family, in Israel. C. procera flowers have evolved to conceal their nectar to prevent theft by ants and to preserve the nectar's moisture. The article highlights the crucial role of two species of carpenter bees (Xylocopa) as the plant's sole pollinators, and it discusses their specific behaviors while visiting the flowers. The study emphasizes the importance of nectar concentration in controlling pollen germination during the pollination process.
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Patterns of Nectar Production in Asclepias curassavica (Apocynaceae))
Broyles, Steven. "Patterns of nectar production in Asclepias curassavica (Apocynaceae)." Journal of Pollination Ecology 25 (2019).
This research article published in the Journal of Pollination Ecologyexamines the patterns of nectar production in the milkweed species Asclepias curassavica. The study, conducted in a controlled greenhouse environment, found that A. curassavica secretes nectar mainly during daylight hours and continues at a steady rate for several days. The study also revealed that fresh nectar has a lower sugar concentration than older nectar, which could benefit both insect pollinators and pollen germination. The researchers observed that the unique floral structure of the milkweed allows for the rapid germination of pollen and attracts diurnal pollinators over several days. Furthermore, the study found variations in nectar production among different plants and inflorescences, and this variation is further influenced by the removal of nectar by insects. These findings highlight the potential role of pollinator-mediated selection on nectar traits in milkweeds, suggesting that milkweeds can adjust their nectar production to attract pollinators and promote successful reproduction.
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Puuttuva jakso?
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What do monarchs feed on in winter? Nectar sources at hibernation sites
SĂĄnchez-Tlacuahuac, N., Pimentel-Equihua, J.L., Espinosa-HernĂĄndez, V. et al. What do monarchs feed on in winter? Nectar sources at hibernation sites. J Insect Conserv 27, 181â191 (2023). https://doi.org/10.1007/s10841-022-00433-z
This research article examines the nectar sources used by monarch butterflies during their winter hibernation in the Monarch Butterfly Biosphere Reserve in Mexico. The study identified 29 plant species that monarchs frequently feed on, with Asteraceae being the most common family represented. The researchers observed a strong correlation between the number of monarch feeding visits and the abundance of certain plants, particularly those with white or yellow flowers. The findings suggest that promoting these plants in agricultural areas surrounding the reserve could help support monarch populations and mitigate the negative impacts of forest degradation.
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Comparison of Common Milkweed and Honeyvine Milkweed (Asclepiadaceae) as Host Plants for Monarch Larvae (Lepidoptera: Nymphalidae)
Kenneth V. Yeargan and Cora M. Allard "Comparison of Common Milkweed and Honeyvine Milkweed (Asclepiadaceae) as Host Plants for Monarch Larvae (Lepidoptera: Nymphalidae)," Journal of the Kansas Entomological Society 78(3), 247-251, (1 July 2005). https://doi.org/10.2317/0407.40.1
This study examines the suitability of two milkweed species, common milkweed (Asclepias syriaca) and honeyvine milkweed (Cynanchum laeve), as host plants for monarch butterfly larvae. The authors, Yeargan and Allard, were particularly interested in honeyvine milkweed because it is prevalent in the eastern United States, yet its role as a monarch host plant is understudied. Their research revealed that monarch larvae developed faster on honeyvine milkweed than on common milkweed, suggesting that it could be a more important host plant than previously recognized. Although pupal weight and survival rates were slightly higher on common milkweed, the differences were not statistically significant. The authors argue that honeyvine milkweed deserves further investigation, particularly in the context of natural enemies and potential differences in plant morphology and phytochemicals that could influence the monarch butterfly lifecycle.
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New records of pollinators and other insects associated with Arizona milkweed, Asclepias angustifolia, at four sites in Southeastern Arizona
Behrstock, R. A. (2021). New records of pollinators and other insects associated with Arizona milkweed, Asclepias angustifolia, at four sites in Southeastern Arizona. Journal of Pollination Ecology, 27. https://doi.org/10.26786/1920-7603(2021)621
This research article, published in the Journal of Pollination Ecology, investigates the insect visitors of Asclepias angustifolia, a type of milkweed that grows in southeastern Arizona. The author, Robert Aaron Behrstock, observed and photographed these insects over two years at four different sites, identifying over 369 insect species, including potential pollinators. The article discusses the types of insects observed, their roles in pollination, and the importance of A. angustifolia for pollinators like monarch butterflies. This research provides valuable information on the insect communities associated with this important plant species and emphasizes the significance of milkweed in supporting biodiversity.
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Seasonal windows of opportunity in milkweedâmonarch interactions Louie H. Yang, Meredith L. Cenzer First published: 05 September 2019 https://doi.org/10.1002/ecy.2880 Citations: 17 Corresponding Editor: Matthew L. Forister. The research article explores the seasonal windows of opportunity for monarch butterfly larvae to develop successfully on milkweed plants. It examines how the prospects for monarch larval development change throughout the growing season by manipulating the timing of monarch egg introductions to milkweed plants in three different years. The researchers investigated the role of various factors, including abiotic thermal stress, host plant density and quality, and natural enemy risk, in shaping these seasonal windows. By comparing the seasonal patterns of larval success and potential explanatory factors, the study suggests that seasonal variation in abiotic conditions, host plant availability, host plant traits, and natural enemy risk all potentially constrain monarch larval development and population growth. The timing of heat waves has multiyear effects on milkweed and its insect community Olivia L. Cope, Luke N. Zehr, Anurag A. Agrawal, William C. Wetzel First published: 09 February 2023 https://doi.org/10.1002/ecy.3988 Both sources explore the relationship between milkweed plants and their insect communities, particularly monarchs, within the context of changing environmental conditions. The first source focuses on the seasonal windows of opportunity for monarch development, investigating how factors such as temperature, milkweed availability and defensive traits influence monarch larval success throughout the growing season. The second source looks at the multiyear effects of heat waves on milkweed and its insect community, emphasizing how the timing of heat waves impacts plant growth, fecundity, and the abundance of different aphid species over multiple years. Both studies highlight the importance of temporal factors in understanding species interactions and the potential ecological consequences of changing climates.
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Butterflies Across the Globe: A Synthesis of the Current Status and Characteristics of Monarch (Danaus plexippus) Populations Worldwide
Front. Ecol. Evol., 26 September 2019 Sec. Conservation and Restoration Ecology Volume 7 - 2019 | https://doi.org/10.3389/fevo.2019.00362This article published in Frontiers in Ecology and Evolutionexamines the global distribution and characteristics of monarch butterfly populations. While monarchs are best known for their long-distance migrations in North America, the butterflies have expanded across the globe over the past two centuries. This study provides a comprehensive overview of the species' range, highlighting significant differences in morphology, migration, overwintering behavior, larval diet, natural enemies, and genetic makeup among populations. The authors argue that these variations enhance the species' adaptive capacity, enabling monarchs to adapt to changing environmental conditions. The article also identifies key gaps in our understanding of monarchs worldwide, highlighting the need for further research to assess population trends and threats, particularly in light of the documented declines in North American populations.
Migration and Overwintering in Australian Monarch Butterflies (Danaus plexippus(L.) (Lepidoptera: Nymphalidae): a Review with New Observations and Research Needs
David G. James and Teresa A. James "Migration and Overwintering in Australian Monarch Butterflies (Danaus plexippus (L.) (Lepidoptera: Nymphalidae): a Review with New Observations and Research Needs," The Journal of the Lepidopterists' Society 73(3), 177-190, (13 December 2019). https://doi.org/10.18473/lepi.73i3.a7
This excerpt is from a scientific article published in The Journal of the Lepidopterists' Society titled "Migration and Overwintering in Australian Monarch Butterflies (Danaus plexippus (L.) (Lepidoptera: Nymphalidae): a Review with New Observations and Research Needs." The authors, David G. James and Teresa A. James, review the known history of monarch butterfly migration and overwintering in Australia. They highlight that while overwintering aggregations of monarchs were first observed in the 1930s and 1940s, scientific study of these phenomena did not begin until the 1960s. The article also presents new observations of monarch behavior at previously unrecorded overwintering sites in Australia, including the first confirmed overwintering locations in Victoria and on Flinders Island. The authors conclude by emphasizing the need for further research to better understand the annual status, size, and phenology of monarch populations in Australia.
Pattern and drivers of danaine butterfly migration in Southern India: implications for conservationVinayan, P.A., Yathumon, M.A., Sujin, N.S. et al. Pattern and drivers of danaine butterfly migration in Southern India: implications for conservation. J Insect Conserv 27, 505â516 (2023). https://doi.org/10.1007/s10841-023-00473-z
This research article investigates the patterns, drivers, and conservation implications of the seasonal migration of danaine butterflies (a type of milkweed butterfly) in Southern India. The authors studied the migration pattern of these butterflies, including their breeding sites and the plants they use to gather pyrrolizidine alkaloids (PAs) - a crucial chemical for their defense and mating. Their findings show that the dominant migrating danaine species, Tirumala septentrionis and Euploea sylvester, breed in the Eastern Ghats and plains of Southern India, not in the Western Ghats where they congregate. This finding highlights the importance of conserving not just the Western Ghats, but also the Eastern Ghats and plains for the successful continuation of the migration. The study also emphasizes the crucial role of PA plants for the survival and reproduction of these butterflies and emphasizes the need for their protection. The authors highlight various conservation challenges facing these butterflies, including habitat loss, invasive species, and climate change. The paper concludes by recommending future research directions and conservation strategies to protect this spectacular migration phenomenon and its ecological importance.
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Temporal matches between monarch butterfly and milkweed population changes over the past 25,000 years Boyle, John H. et al. Current Biology, Volume 33, Issue 17, 3702 - 3710.e5
This research paper investigates the long-term population dynamics of monarch butterflies and common milkweed, their primary food source, over the past 25,000 years. The study utilizes genomic data, including a newly-constructed chromosome-level genome assembly for common milkweed, to reconstruct the demographic histories of both species. The authors found that both monarchs and milkweed experienced population expansions during the retreat of glaciers 10,000 to 20,000 years ago and again with the widespread clearing of North American forests in the last few centuries. Importantly, they found no evidence of recent population declines in either species despite well-documented decreases in monarch abundance over the past 40 years. This suggests that the observed monarch decline might not be a reflection of a true reduction in effective population size but rather a mismatch between the overwintering census population and the broader, genetically-diverse population. The study's findings provide valuable insights into the complex interplay between these iconic species and the impact of human activities on their long-term population trajectories.
The Evolution of Inflorescence Size in Asclepias (Asclepiadaceae)Willson, Mary F., and Peter W. Price. âThe Evolution of Inflorescence Size in Asclepias (Asclepiadaceae).â Evolution, vol. 31, no. 3, 1977, pp. 495â511. JSTOR, https://doi.org/10.2307/2407517. Accessed 1 Oct. 2024.
This research article, published in 1977 in the journal Evolution, explores the evolutionary factors influencing the size of flower clusters, known as inflorescences, in the milkweed genus Asclepias. The authors, Mary F. Willson and Peter W. Price, hypothesize that inflorescence size is an evolved trait shaped by selection pressures related to both pollen donation and reception. They investigate this hypothesis by examining the relationship between inflorescence size and various reproductive outcomes like pod initiation, fruit maturation, and pollen donation. They find that larger inflorescences, while advantageous for attracting pollinators and facilitating pollen donation, do not always translate to more mature fruits due to factors like pod abortion and intrabrood competition. They conclude that while larger inflorescences may have a selective advantage in terms of pollen donation, factors like resource limitation, pod abortion, and intrabrood competition play significant roles in limiting inflorescence size, suggesting that the evolutionary trajectory of inflorescence size in Asclepias is likely driven by a complex interplay of these factors.
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Citation:
Mary E. Endress, Sigrid Liede-Schumann, and Ulrich Meve "ADVANCES IN APOCYNACEAE: THE ENLIGHTENMENT, AN INTRODUCTION," Annals of the Missouri Botanical Garden 94(2), 259-267, (27 July 2007). https://doi.org/10.3417/0026-6493(2007)94[259:AIATEA]2.0.CO;2
https://bsapubs.onlinelibrary.wiley.com/doi/10.1002/ajb2.1067
This is an excerpt from the online journal Annals of the Missouri Botanical Garden containing an introduction to a collection of articles about the Apocynaceae plant family. The authors, Mary E. Endress, Sigrid Liede-Schumann, and Ulrich Meve, present a revised classification system for the Apocynaceae family. They highlight advances in research on the family's phylogeny, biogeography, pollination biology, and even how some butterflies utilize the family's pyrrolizidine alkaloids. The authors make note of the updated classification scheme, which recognizes a new tribe in Rauvolfioideae and three new tribes in Apocynoideae. They also highlight the seven new subtribes recognized in Asclepiadoideae. This article serves as an introduction to the special issue devoted to recent research on the Apocynaceae family, providing a comprehensive overview of the advancements made.
Citation:
Evolution on the backbone: Apocynaceae phylogenomics and new perspectives on growth forms, flowers, and fruits
Mark Fishbein, Tatyana Livshultz, Shannon C. K. Straub, André O. SimÔes, Julien Boutte, Angela McDonnell, Abbey Foote
First published: 07 May 2018
https://doi.org/10.1002/ajb2.1067This is an article published in the American Journal of Botanythat examines the evolutionary history of the Apocynaceae plant family, which includes milkweeds, oleanders, and periwinkles. The authors conducted a large-scale phylogenetic analysis using genetic data from a significant portion of the family. This analysis resulted in a well-supported evolutionary tree, clarifying relationships between various Apocynaceae groups and shedding light on how traits like growth form, flowers, and fruits have changed over time within the family. The study highlights the importance of extensive sampling and the use of appropriate evolutionary models for understanding the complex evolutionary processes shaping plant diversity.
