S. Johnson

Publications20
h-index11
Citations1,245
Highly Influential Citations87
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A Cross-System Comparison of Bacterial and Fungal Biomass in Detritus Pools of Headwater Streams
The absolute amount of microbial biomass and relative contribution of fungi and bacteria are expected to vary among types of organic matter (OM) within a stream and will vary among streams because of… Expand
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Medicines adherence: Involving patients in decisions about prescribed medicines and supporting adherence
It is thought that between a third and a half of all medicines1 There are many causes of non-adherence but they fall into two overlapping categories: intentional and unintentional. Unintentional… Expand
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Small-Scale Vertical Distribution of Bacterial Biomass and Diversity in Biological Soil Crusts from Arid Lands in the Colorado Plateau
We characterized, at millimeter resolution, bacterial biomass, diversity, and vertical stratification of biological soil crusts in arid lands from the Colorado Plateau. Microscopic counts,… Expand
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Relevance of ammonium oxidation within biological soil crust communities.
Thin, vertically structured topsoil communities that become ecologically important in arid regions (biological soil crusts or BSCs) are responsible for much of the nitrogen inputs into pristine arid… Expand
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Export of nitrogenous compounds due to incomplete cycling within biological soil crusts of arid lands.
Second only to water among limiting factors, nitrogen controls the fertility of most arid regions. Where dry and wet depositions are weak, as in the western US deserts, N inputs rely heavily on… Expand
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Response and resilience of soil biocrust bacterial communities to chronic physical disturbance in arid shrublands
The impact of 10 years of annual foot trampling on soil biocrusts was examined in replicated field experiments at three cold desert sites of the Colorado Plateau, USA. Trampling detrimentally… Expand
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Increased temperature and altered summer precipitation have differential effects on biological soil crusts in a dryland ecosystem
Biological soil crusts (biocrusts) are common and ecologically important members of dryland ecosystems worldwide, where they stabilize soil surfaces and contribute newly fixed C and N to soils. To… Expand
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Response of Biological Soil Crust Diazotrophs to Season, Altered Summer Precipitation, and Year-Round Increased Temperature in an Arid Grassland of the Colorado Plateau, USA
Biological soil crusts (biocrusts), which supply significant amounts of fixed nitrogen into terrestrial ecosystems worldwide (∼33 Tg y−1), are likely to respond to changes in temperature and… Expand
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Ammonia-oxidizing archaea and bacteria are structured by geography in biological soil crusts across North American arid lands
IntroductionBiological soil crusts (BSCs) can dominate surface cover in dry lands worldwide, playing an integral role in arid land biogeochemistry, particularly in N fertilization through fixation… Expand
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The response of fish and macroinvertebrate assemblages to multiple stressors: A comparative analysis of aquatic communities in a perturbed watershed (Onondaga Lake, NY)
Abstract Stream bioassessment studies usually use a single taxonomic group, most commonly fish or macroinvertebrates. However, differences in the life histories, habitat preferences, and… Expand
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