Paul D. Johnson

Publications40
h-index16
Citations854
Highly Influential Citations45
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Conservation Status of Freshwater Gastropods of Canada and the United States
TLDR
Comparison of modern to background extinction rates reveals that gastropods have the highest modern extinction rate yet observed, 9,539 times greater than background rates.
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Identification of ‘extinct’ freshwater mussel species using DNA barcoding
TLDR
Results from examination of freshwater mussels collected during an extensive survey of the upper‐drainage basin confirm the rediscovery of four morphospecies in the genus Pleurobema (Unionidae) previously thought to be extinct from the upper Coosa basin, and molecular data show that the Coosa morphologies represent at least three species‐level taxa.
View on Wiley
Effects of temperature and chronic hypoxia on survivorship of the zebra mussel (Dreissena polymorpha) and Asian clam (Corbicula fluminea)
TLDR
It is shown that both species displayed broad seasonal variation in hypoxia tolerance and that hypoxIA limits may be used to assess infestation risk and thatHypoxia limits may also be used for distribution patterns.
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Acerola (Malpighia glabra L., M. punicifolia L., M. emarginata D.C.): agriculture, production and nutrition.
  • Paul D. Johnson
  • Biology, Medicine
    World review of nutrition and dietetics
  • 2003
View on PubMed
The Role of Current and Light in Explaining the Habitat Distribution of the Lotic Snail Elimia semicarinata (Say)
TLDR
The results suggest that adults may select flow refugia, while juveniles avoid them, and that pleurocerid population dynamics are influenced by current velocity directly by shear stress, or indirectly by effects of current velocity on periphyton biomass.
View on U Chicago Press
Description and characterization of the digestive gland microbiome in the freshwater mussel Villosa nebulosa (Bivalvia: Unionidae)
TLDR
The results show that novel microbial communities exist within the digestive gland of freshwater mussels, with all individual mussels sharing 9 OTUs, and a core microbiome in the digestive glands of V. nebulosa is identified.
View on Wolters Kluwer
Pesticide residues on the external surfaces of field-crop sprayers: environmental impact.
TLDR
The findings here indicate that the quantity of these residues may be sufficient to be harmful to aquatic organisms should the residues enter a watercourse and further work is required to assess whether a more frequent cleaning regime would reduce the overall environmental impact of cleaning sprayers.
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Contribution of household herbicide usage to glyphosate and its degradate aminomethylphosphonic acid in surface water drains.
TLDR
Glyphosate and AMPA losses from urban areas that arise solely from amateur usage have been quantified and, in spite of overdosing occurring, glyphosate concentrations in drain flow were lower than concentrations reported elsewhere from professional use in urban areas.
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Comparative physiological, biochemical and molecular thermal stress response profiles for two unionid freshwater mussel species
TLDR
Comparative response profiling of two freshwater mussels, Villosa lienosa and Villosa nebulosa, under acute and chronic heat conditions indicates disparate thermal response mechanisms that may influence their range and survival under predicted global warming.
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The importance of microhabitat factors and habitat stability to the threatened Louisiana pearl shell, Margaritifera hembeli (Conrad)
TLDR
A discriminant analysis indicated that mussel density was related to water depth, substrate size, substrate compaction, and water velocity, and that mussels were rare in deep, stagnant pools with silt-covered bottoms and were more common in shallow, wide areas of streams with higher current velocities.
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