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University of Tennessee, Knoxville
Faculty Publications and Other Works -- Ecology and Evolutionary Biology
- Discipline
- Keyword
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- Allopatric speciation (1)
- Basidiomycete fungi (1)
- Behavioral ecology (1)
- Biogeography (1)
- Carbon cycle (1)
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- Chimera (1)
- Decomposition (1)
- Disjunct distributions (1)
- Ectomycorrhizae (1)
- Evolutionary origins (1)
- Extracellular enzyme activity (1)
- Hybrid (1)
- Mathematical models (1)
- Monokaryons (1)
- Phylogenetic species (1)
- Plant-soil interactions (1)
- Recombination (1)
- Resources (1)
- Ribosomal repeat (1)
- Simulation model (1)
- Soil carbon sequestration (1)
- Species delineations (1)
- Spite (1)
Articles 1 - 4 of 4
Full-Text Articles in Entire DC Network
Transatlantic Disjunction In Fleshy Fungi Iii: Gymnopus Confluens, Karen Hughes, Ronald H. Petersen
Transatlantic Disjunction In Fleshy Fungi Iii: Gymnopus Confluens, Karen Hughes, Ronald H. Petersen
Faculty Publications and Other Works -- Ecology and Evolutionary Biology
Phylogeographic data indicate that DNA differences consistently exist between the North American and European allopatric populations of Gymnopus confluens. Conversely, pairing experiments show that collections from both populations were sexually compatible in vitro and detailed morphological examinations of numerous fresh and dried basidiomata do not produce qualitative differences. Percent ITS sequence divergence between Europe and North American collections of G. confluens was 3.25%. Species delineation metrics including Rosenberg’s PAB statistic, PID metrics, RRD ( randomly distributed) and PTP (Poisson Tree Processes ) gave mixed indications that North American and European populations were distinct at species rank. …
Decomposition By Ectomycorrhizal Fungi Alters Soil Carbon Storage In A Simulation Model, Jessica Moore, Jiang Jiang, W. M. Post, Aimée T. Classen
Decomposition By Ectomycorrhizal Fungi Alters Soil Carbon Storage In A Simulation Model, Jessica Moore, Jiang Jiang, W. M. Post, Aimée T. Classen
Faculty Publications and Other Works -- Ecology and Evolutionary Biology
Carbon cycle models often lack explicit belowground organism activity, yet belowground organisms regulate carbon storage and release in soil. Ectomycorrhizal fungi are important players in the carbon cycle because they are a conduit into soil for carbon assimilated by the plant. It is hypothesized that ectomycorrhizal fungi can also be active decomposers when plant carbon allocation to fungi is low. Here, we reviewed the literature on ectomycorrhizal decomposition and we developed a simulation model of the plant-mycorrhizae interaction where a reduction in plant productivity stimulates ectomycorrhizal fungi to decompose soil organic matter. Our review highlights evidence demonstrating the potential for …
Cloning Of Ribosomal Its Pcr Products Creates Frequent, Non-Random Chimeric Sequences – A Test Involving Heterozygotes Between Gymnopus Dichrous Taxa I And Ii., Karen Hughes, Samuel D. Morris, Ana L. Reboredo-Segovia
Cloning Of Ribosomal Its Pcr Products Creates Frequent, Non-Random Chimeric Sequences – A Test Involving Heterozygotes Between Gymnopus Dichrous Taxa I And Ii., Karen Hughes, Samuel D. Morris, Ana L. Reboredo-Segovia
Faculty Publications and Other Works -- Ecology and Evolutionary Biology
Gymnopus dichrous exists in the southern Appalachians as two distinct entities with essentially identical nuclear ribosomal ITS1 sequences but differing ITS2 and LSU sequences (for convenience, called G. dichrous I and II). F1 ITS heterozygotes between the two are routinely collected from nature. Cloning of ITS PCR products from F1 heterozygotes produced sequences of both parental haplotypes but also numerous chimeric sequences (21.9%). The location of template switching was non-random leading to recovery of the same chimera several times and the chimeric region varied from 45bp to 300bp. By comparison, single-basidiospore isolates from heterozygote F1 fruitbodies showed …
To Play Or Not To Play? That’S A Resource Abundance Question, Jeremy David Auerbach, Andrew R. Kanarek, Gordon M. Burghardt
To Play Or Not To Play? That’S A Resource Abundance Question, Jeremy David Auerbach, Andrew R. Kanarek, Gordon M. Burghardt
Faculty Publications and Other Works -- Ecology and Evolutionary Biology
Although play occurs in a wide variety of animals, models of the origins of play behavior are lacking. We propose a novel computational model exploring the evolution of non-social frivolous play. Asexually reproducing semelparous animals can either rest or forage. Foraging occurs when an organism is below an energy threshold. Success is determined by the combination of skill and availability of resources, which declines over time but replenishes for each generation. Play was introduced as a mutant strategy: a frivolous activity that uses energy and increases the probability of dying over resting with no direct fitness benefit. Simulations show that …