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Milkweed loss in agricultural fields because of herbicide use: effect on the monarch butterfly population
There has been a large decline in milkweed in agricultural fields in the Midwest over the last decade, coincident with the increased use of glyphosate herbicide in conjunction with increased planting of genetically modified (GM) glyphosate‐tolerant corn (maize) and soybeans (soya).
Impact of Bt corn pollen on monarch butterfly populations: A risk assessment
The impact of Bt corn pollen from current commercial hybrids on monarch butterfly populations is negligible, according to a 2-year study by scientists in several states and in Canada.
Bioenergy and Wildlife: Threats and Opportunities for Grassland Conservation
Demand for land to grow corn for ethanol increased in the United States by 4.9 million hectares between 2005 and 2008, with wide-ranging effects on wildlife, including habitat loss. Depending on how
Temporal and spatial overlap between monarch larvae and corn pollen
It is found that monarchs use milkweed in cornfields throughout their breeding season, and that per plant densities are as high or higher in agricultural habitats as in nonagricultural habitats, suggesting that agricultural practices such as weed control and foliar insecticide use could have large impacts on monarch populations.
Characteristics of professional development that effect change in secondary science teachers' classroom practices
We studied the outcome of a professional development opportunity that consisted of 2- week-long resident institutes for teams consisting of a secondary science teacher and two students. The science
Associations between host migration and the prevalence of a protozoan parasite in natural populations of adult monarch butterflies
Because monarchs form resident and migratory populations in different parts of the world, this host–parasite system provides the opportunity to examine how variation in parasite prevalence relates to host movement patterns.
Restoring monarch butterfly habitat in the Midwestern US: ?all hands on deck?
The eastern migratory population of monarch butterflies (Danaus plexippus plexippus) has declined by >80% within the last two decades. One possible cause of this decline is the loss of ≥1.3 billion
Effects of spermatophores on male and female monarch butterfly reproductive success
  • K. Oberhauser
  • Biology
    Behavioral Ecology and Sociobiology
  • 1 October 1989
There was wide variation in the number of matings by captive males, suggesting the potential for strong sexual selection on males and two effects of spermatophores on female behavior or fecundity are reported.
Ecological Niches in Sequential Generations of Eastern North American Monarch Butterflies (Lepidoptera: Danaidae): The Ecology of Migration and Likely Climate Change Implications
Eastern North American monarch butterflies show a series of range shifts during their breeding season, and this study studied the environmental context of these shifts by identifying the ecological conditions that monarchs use in successive summer months.