In nitrogen (N) fixing symbioses, host-symbiont specificity, genetic variation in bacterial symbi... more In nitrogen (N) fixing symbioses, host-symbiont specificity, genetic variation in bacterial symbionts and environmental variation represent fundamental constraints on the ecology, evolution and practical uses of these interactions, but detailed information is lacking for many naturally occurring N-fixers. This study examined phylogenetic host specificity of Frankia in field-collected nodules of two Alnus species (A. tenuifolia and A. viridis) in interior Alaska and, for A. tenuifolia, distribution, diversity, spatial autocorrelation and correlation with specific soil factors of Frankia genotypes in nodules collected from replicated habitats representing endpoints of a primary sere. Frankia genotypes most commonly associated with each host belonged to different clades within the Alnus-infective Frankia clade, and for A. tenuifolia, were divergent from previously described Frankia. A. tenuifolia nodules from early and late succession habitats harboured distinct Frankia assemblages. In...
Author; TAYLOR D. LEE (Univ. Alaska, Ak, Usa) HERRIOTT IAN (Univ. Alaska, Ak, Usa) GEML JOZSEF (U... more Author; TAYLOR D. LEE (Univ. Alaska, Ak, Usa) HERRIOTT IAN (Univ. Alaska, Ak, Usa) GEML JOZSEF (Univ. Alaska, Ak, Usa) MARR TOM (Univ. Alaska, Ak, Usa) LONG JAMES (Univ. Alaska, Ak, Usa) RUESS ROGER (Univ. Alaska, Ak, Usa) LAURSEN GARY (Univ. ...
This paper assesses the resilience of Alaska’s boreal forest system to rapid climatic change. Rec... more This paper assesses the resilience of Alaska’s boreal forest system to rapid climatic change. Recent warming is associated with reduced growth of dominant tree species, plant disease and insect outbreaks, warming and thawing of permafrost, drying of lakes, increased wildfire extent, increased postfire recruitment of deciduous trees, and reduced safety of hunters traveling on river ice. These changes have modified key structural features, feedbacks, and interactions in the boreal forest, including reduced effects of upland permafrost on regional hydrology, expansion of boreal forest into tundra, and amplification of climate warming because of reduced albedo (shorter winter season) and carbon release from wildfires. Other temperature-sensitive processes for which no trends have been detected include composition of plant and microbial communities, long-term landscape-scale change in carbon stocks, stream discharge, mammalian population dynamics, and river access and subsistence opportu...
Increasing ecological inference from high throughput sequencing of fungi in the environment throu... more Increasing ecological inference from high throughput sequencing of fungi in the environment through a tagging approach
This dataset contains proportion of fine root length colonized by root-associated fungi, foliar %... more This dataset contains proportion of fine root length colonized by root-associated fungi, foliar %N, %C, d15N, d13C, and maximum photosynthesis, respiration, LAI, and CUE for Picea mariana, Picea glauca, Alnus viridis, and Betula neo-alaskana seedlings inoculated with root-associated fungal communities and outplanted at Finger Mountain and the Anaktuvuk River Fire burn scars.
Additional file 7a, b. Biplots of nonmetric multidimensional scaling ordinations of fungal commun... more Additional file 7a, b. Biplots of nonmetric multidimensional scaling ordinations of fungal communities associated with a). alder and b). spruce seedlings inoculated with soils from the Anaktuvuk River Fire and site characteristics. Active layer = depth of the unfrozen soil at time of sampling; dNBR = differenced normalized burn ratio of the sampling site; CBI = composite burn index of the sampling site.
In nitrogen (N) fixing symbioses, host-symbiont specificity, genetic variation in bacterial symbi... more In nitrogen (N) fixing symbioses, host-symbiont specificity, genetic variation in bacterial symbionts and environmental variation represent fundamental constraints on the ecology, evolution and practical uses of these interactions, but detailed information is lacking for many naturally occurring N-fixers. This study examined phylogenetic host specificity of Frankia in field-collected nodules of two Alnus species (A. tenuifolia and A. viridis) in interior Alaska and, for A. tenuifolia, distribution, diversity, spatial autocorrelation and correlation with specific soil factors of Frankia genotypes in nodules collected from replicated habitats representing endpoints of a primary sere. Frankia genotypes most commonly associated with each host belonged to different clades within the Alnus-infective Frankia clade, and for A. tenuifolia, were divergent from previously described Frankia. A. tenuifolia nodules from early and late succession habitats harboured distinct Frankia assemblages. In...
Author; TAYLOR D. LEE (Univ. Alaska, Ak, Usa) HERRIOTT IAN (Univ. Alaska, Ak, Usa) GEML JOZSEF (U... more Author; TAYLOR D. LEE (Univ. Alaska, Ak, Usa) HERRIOTT IAN (Univ. Alaska, Ak, Usa) GEML JOZSEF (Univ. Alaska, Ak, Usa) MARR TOM (Univ. Alaska, Ak, Usa) LONG JAMES (Univ. Alaska, Ak, Usa) RUESS ROGER (Univ. Alaska, Ak, Usa) LAURSEN GARY (Univ. ...
This paper assesses the resilience of Alaska’s boreal forest system to rapid climatic change. Rec... more This paper assesses the resilience of Alaska’s boreal forest system to rapid climatic change. Recent warming is associated with reduced growth of dominant tree species, plant disease and insect outbreaks, warming and thawing of permafrost, drying of lakes, increased wildfire extent, increased postfire recruitment of deciduous trees, and reduced safety of hunters traveling on river ice. These changes have modified key structural features, feedbacks, and interactions in the boreal forest, including reduced effects of upland permafrost on regional hydrology, expansion of boreal forest into tundra, and amplification of climate warming because of reduced albedo (shorter winter season) and carbon release from wildfires. Other temperature-sensitive processes for which no trends have been detected include composition of plant and microbial communities, long-term landscape-scale change in carbon stocks, stream discharge, mammalian population dynamics, and river access and subsistence opportu...
Increasing ecological inference from high throughput sequencing of fungi in the environment throu... more Increasing ecological inference from high throughput sequencing of fungi in the environment through a tagging approach
This dataset contains proportion of fine root length colonized by root-associated fungi, foliar %... more This dataset contains proportion of fine root length colonized by root-associated fungi, foliar %N, %C, d15N, d13C, and maximum photosynthesis, respiration, LAI, and CUE for Picea mariana, Picea glauca, Alnus viridis, and Betula neo-alaskana seedlings inoculated with root-associated fungal communities and outplanted at Finger Mountain and the Anaktuvuk River Fire burn scars.
Additional file 7a, b. Biplots of nonmetric multidimensional scaling ordinations of fungal commun... more Additional file 7a, b. Biplots of nonmetric multidimensional scaling ordinations of fungal communities associated with a). alder and b). spruce seedlings inoculated with soils from the Anaktuvuk River Fire and site characteristics. Active layer = depth of the unfrozen soil at time of sampling; dNBR = differenced normalized burn ratio of the sampling site; CBI = composite burn index of the sampling site.
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