H. Mattila

Publications50
h-index25
Citations3,463
Highly Influential Citations196
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Impact of Bt corn pollen on monarch butterfly populations: A risk assessment
TLDR
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.
Monarch larvae sensitivity to Bacillus thuringiensis- purified proteins and pollen
TLDR
Results from the other types of Bt corn suggest that pollen from the Cry1Ab and Cry1F, and experimental Cry9C hybrids, will have no acute effects on monarch butterfly larvae in field settings, and pollen contaminants, an artifact of pollen processing, can dramatically influence larval survival and weight gains and produce spurious results.
Corn pollen deposition on milkweeds in and near cornfields
TLDR
The density of corn pollen on leaves of milkweed plants inside and outside of cornfields was measured to obtain a representative picture of naturally occurring pollen densities to provide a perspective for laboratory and field studies of monarch larvae feeding on milkweed leaves with Bt corn pollen.
Temporal and spatial overlap between monarch larvae and corn pollen
TLDR
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.
Genetic Diversity in Honey Bee Colonies Enhances Productivity and Fitness
TLDR
It is shown that swarms from genetically diverse colonies (15 patrilines per colony) founded new colonies faster than swarming from genetically uniform colonies (1 patriline per colony), and accumulated differences in foraging rates, food storage, and population growth led to impressive boosts in the fitness of genetic diverse colonies.
Assessing the impact of Cry1Ab-expressing corn pollen on monarch butterfly larvae in field studies
TLDR
The effects of Bt11 and Mon810 pollen on the survivorship of larvae feeding 14 to 22 days on milkweeds in fields were negligible and survivorship and weight gain were drastically reduced in non-Bt fields treated with λ-cyhalothrin.
Collective personalities in honeybee colonies are linked to colony fitness
Molecular Determinants of Scouting Behavior in Honey Bees
Bee Adventurous Individuals differ in their behavior, sometimes in consistent ways. For example, some people may seek out new experiences, while others prefer to stick with what they know. This is…
Influence of pollen diet in spring on development of honey bee (Hymenoptera: Apidae) colonies.
TLDR
Results indicate that an investment in supplementing the pollen diet of colonies would be returned for situations in which large spring populations are important, but long-term improvement in honey yields may only result when spring foraging is severely reduced by inclement weather.
Saccharide breakdown and fermentation by the honey bee gut microbiome.
TLDR
It is suggested that the gut microflora of the honey bee harbours bacterial members with unique roles, which ultimately can contribute to the processing of plant-derived food for colonies.
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