• Publications
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Understanding and misunderstanding the migration of the monarch butterfly (Nymphalidae) in North America: 1857-1995
Since 1857, amateurs and professionals have woven a rich tapestry of biological information about the monarch butterfly's migration in North America. Huge fall migrations were first noted in theExpand
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Fueling the fall migration of the monarch butterfly.
Monarch butterflies in eastern North America accumulate lipids during their fall migration to central Mexico, and use them as their energy source during a 5 month overwintering period. When and whereExpand
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Associations between host migration and the prevalence of a protozoan parasite in natural populations of adult monarch butterflies
1. Monarch butterflies Danaus plexippus (L.) (Lepidoptera: Nymphalidae) are susceptible to infection by the obligate protozoan parasite Ophryocystis elektroscirrha (McLaughlin and Myers)Expand
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It’s the first bites that count: Survival of first‐instar monarchs on milkweeds
Mortality of first instars is generally very high, but variable, and is caused by many factors, including physical and chemical plant characters, weather and natural enemies. Here, a summary ofExpand
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Detrimental effects of latex and cardiac glycosides on survival and growth of first‐instar monarch butterfly larvae Danaus plexippus feeding on the sandhill milkweed Asclepias humistrata
1. A novel experimental method was developed to study negative physical and chemical effects of latex and cardiac glycosides on first‐instar monarch butterfly larvae in their natural environment inExpand
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Quantitative changes in forest quality in a principal overwintering area of the Monarch Butterfly in Mexico, 1971-1999
Abstract: Degradation of the oyamel fir-pine forest ecosystem in central Mexico is a threat to the overwintering and migratory phenomenon of the eastern North American population of the monarchExpand
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Animal Migrations: Endangered Phenomena
Synopsis. Current conservation research focuses on diminishing species diversity, minimal viable populations, and on the successive demise of habitats and populations that leads species toExpand
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THE ACCURACY OF A POPULATION ESTIMATION FROM MULTIPLE RECAPTURE DATA
Several methods have been developed for estimating population size from multiple markrelease-recapture data, which vary to suit the animal and environment under study (for example: Fisher & FordExpand
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Freeze‐protection of overwintering monarch butterflies in Mexico: critical role of the forest as a blanket and an umbrella
Abstract. 1. At their high‐altitude overwintering sites in Mexico, monarch butterflies frequently are subjected to sub‐zero°C temperatures during December‐March. Although monarchs have moderateExpand
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