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Unravelling the annual cycle in a migratory animal: breeding-season habitat loss drives population declines of monarch butterflies.
- D. T. Flockhart, Jean-Baptiste Pichancourt, D. Norris, T. Martin
- Environmental ScienceThe Journal of animal ecology
A spatially structured, stochastic and density-dependent periodic projection matrix model that integrates patterns of migratory connectivity and demographic vital rates across the annual cycle is developed and suggests that mitigating the negative effects of genetically modified crops results in higher population size and lower extinction risk.
Tracking multi-generational colonization of the breeding grounds by monarch butterflies in eastern North America
- D. T. Flockhart, L. Wassenaar, T. Martin, K. Hobson, M. Wunder, D. Norris
- Environmental ScienceProceedings of the Royal Society B: Biological…
- 7 October 2013
It is shown that butterflies which overwintered in Mexico came from a wide breeding distribution, including southern portions of the range, which indicated that conserving breeding habitat in the Midwest alone is insufficient to ensure long-term persistence of the monarch butterfly population in eastern North America.
Regional climate on the breeding grounds predicts variation in the natal origin of monarch butterflies overwintering in Mexico over 38 years
The results provide the first robust long-term analysis of predictors of the natal origins of monarchs overwintering in Mexico and suggest the population will likely remain sensitive to regional and stochastic weather patterns.
Demography of Ferruginous Hawks Breeding in Western Canada
It is suggested that ferruginous hawk management should address prey in addition to habitat management, and that management needs are regional in scope with particular emphasis on the breeding range within the northern Great Plains.
Patterns and causes of oviposition in monarch butterflies: Implications for milkweed restoration
Tracking the Conservation Promise of Movement Ecology
- K. Fraser, K. Davies, C. Davy, A. Ford, D. T. Flockhart, E. G. Martins
- Environmental ScienceFront. Ecol. Evol.
- 1 October 2018
From butterflies to elephants, the rapidly developing science of movement ecology is providing increasingly detailed spatio-temporal data on a wide array of mobile animals. Thus, this discipline also…
Experimental Examination of Intraspecific Density-Dependent Competition during the Breeding Period in Monarch Butterflies (Danaus plexippus)
This study is the first to link experimental results of a density-dependent reduction in vital rates to observed monarch densities in the wild and show that the effects of density dependent competition in monarchs varies across space and time, providing valuable information for developing robust, year-round population models in this migratory organism.
Alternate migration strategies of eastern monarch butterflies revealed by stable isotopes
- H. V. Zanden, Carol L. Chaffee, A. González‐Rodríguez, D. T. Flockhart, D. Norris, M. Wayne
- SociologyAnimal Migration
- 1 December 2018
Stable isotope analysis found that 48% of monarchs collected in south Florida are migrants that originated from outside the sampling region; thus, switching to a resident strategy could alter their probability of reproductive success.
Strategic mowing of roadside milkweeds increases monarch butterfly oviposition
Forewing pigmentation predicts migration distance in wild-caught migratory monarch butterflies
The first evidence that the coloration of wild monarchs influences their migration ability over a continental scale is provided, and it is suggested that these differences in color may benefit the cohort of monarchs destined for long-distance migration to their wintering ground.