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Christina Hazard

Christina Hazard
Ecole Centrale de Lyon | ECL · Laboratoire AMPERE (Génie Electrique, Electromagnétique, Automatique, Micro-Biologie Environnementale et Applications)

PhD
http://genomenviron.org/index.php/christina-hazard/

About

34
Publications
3,486
Reads
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428
Citations
Introduction
Our research is dedicated to exploring the diversity and distribution of soil microorganisms in natural and anthropized ecosystems, the factors influencing their communities and activities, and the impact of their interactions on ecosystem functions. Our research has a particular focus on mycorrhizal fungi, which form symbioses with the majority of plants, are found in most terrestrial habitats, and provide several ecosystem services. (http://genomenviron.org/index.php/christina-hazard/)
Additional affiliations
April 2020 - present
Ecole Centrale de Lyon
Position
  • Researcher
January 2015 - March 2020
Ecole Centrale de Lyon
Position
  • PostDoc Position
August 2011 - December 2014
University of Aberdeen
Position
  • PostDoc Position
Education
April 2006 - January 2010
University College Dublin
Field of study
  • Environmental Biology
August 2003 - May 2006
August 2000 - May 2003

Publications

Publications (34)
Article
Potential rate assays are used in soil microbial ecology to determine the rates of a functional process in environmental samples under a defined set of conditions. While they can be used appropriately to provide mechanistic insights, potential rates are also often used to estimate the abundance of specific taxonomic groups and their in situ activit...
Article
The concentration of atmospheric methane (CH 4 ) continues to increase with microbial communities controlling soil–atmosphere fluxes. While there is substantial knowledge of the diversity and function of prokaryotes regulating CH 4 production and consumption, their active interactions with viruses in soil have not been identified. Metagenomic seque...
Article
Crop harvest followed by a fallow period can act as a disturbance on soil microbial communities. Cropping systems intended to improve alpha-diversity of communities may also confer increased compositional stability during succeeding growing seasons. Over a single growing season in a long-term (18 year) agricultural field experiment incorporating co...
Article
Full-text available
Contents Summary I. Introduction II. Are there consistent patterns in diversity of mycorrhizal fungal genotypes and species across space? III. What is the variation in functional traits and genes of mycorrhizal fungi at different taxonomic scales? IV. How will environmental change impact the relationships between genotypic and species diversity of...
Article
Full-text available
Arbuscular fungi have a major role in directing the functioning of terrestrial ecosystems yet little is known about their biogeographical distribution. The Baas-Becking hypothesis ('everything is everywhere, but, the environment selects') was tested by investigating the distribution of arbuscular mycorrhizal fungi (AMF) at the landscape scale and t...
Article
Full-text available
Peatlands contain a significant fraction of global soil carbon, but how these reservoirs will respond to the changing climate is still relatively unknown. A global picture of the variations in peat organic matter chemistry will aid our ability to gauge peatland soil response to climate. The goal of this research is to test the hypotheses that 1) pe...
Article
Full-text available
The influence of biotic and abiotic factors on viral communities across environmental gradients in soil is relatively unknown. While soil pH strongly influences microbial community structure, it is unclear whether there is a similar influence on soil viruses. In this study, prokaryotic and viral communities were characterized in soils from a long-t...
Preprint
Full-text available
Viruses shape microbial community structures, impacting metabolic pathways and influencing biogeochemical cycles. Despite their importance, the influence of biotic and abiotic factors on viral community structures across environmental gradients in soil is relatively unknown compared to their prokaryotic hosts. While soil pH strongly influences micr...
Article
Functional, physiological traits are the underlying drivers of niche differentiation. A common framework related to niches occupied by terrestrial prokaryotes is based on copiotrophy or oligotrophy, where resource investment is primarily in either rapid growth or stress tolerance, respectively. A quantitative trait-based approach sought relationshi...
Article
Full-text available
Intensively managed agriculture land is a significant contributor to nitrous oxide (N2O) emissions, which adds to global warming and the depletion of the ozone layer. Recent studies have suggested that fungal dominant N2O production may be promoted by pathogenic fungi under high nitrogen fertilization and continuous cropping. Here, we measured the...
Preprint
Full-text available
The concentration of atmospheric methane continues to increase with microbial communities controlling soil-atmosphere fluxes. While there is substantial knowledge of the diversity and function of organisms regulating methane production and consumption, the frequency and impact of interactions with viruses on their activity in soil is unknown. Metag...
Preprint
Full-text available
Potential rate assays are used in soil microbial ecology to determine the maximum rate of a functional process in environmental samples. They assume that all contributing organisms in a community are active at a maximum rate under one set of optimal incubation conditions. Potential rates are then often compared to the abundance of specific taxonomi...
Preprint
Full-text available
Resistance is the capacity for a community to remain unchanged, and resilience the capacity to return to an original state, in response to disturbance. Increasing species richness may increase both dynamics. In a long-term agricultural field experiment incorporating conventional (CON), integrated (INT), conservation (CA) and organic (ORG) cropping...
Article
Full-text available
Effects of biodiversity on productivity are more likely to be expressed when there is greater potential for niche complementarity. In soil, chemically complex pools of nutrient resources should provide more opportunities for niche complementarity than chemically simple pools. Ectomycorrhizal (ECM) fungal genotypes can exhibit substantial variation...
Article
A major gap in our understanding of biodiversity-ecosystem function relationships concerns the role of intra- and interspecific diversity of mycorrhizal fungi, which are critical for plant fitness, biogeochemical cycling and other processes. Here, we test the hypothesis that the identity and richness of ectomycorrhizal (ECM) fungi at the intra- and...
Article
Full-text available
The first species of Rhizopogon subgenus Amylopogon identified from eastern North America is described here as Rhizopogon kretzerae Grubisha, Dowie, & Mill. sp. nov. In nature, R. kretzerae has been identified only from DNA sequences of the nuclear ribosomal internal transcribed spacer region (ITS) from mycorrhizal roots of Pinus strobus L. and Pte...
Article
Culture-independent molecular studies have provided new insights into the diversity of fungi associating with ericaceous plant roots. However, there is little understanding of the distribution of these fungi across landscapes, or the effects of environmental heterogeneity on ericoid mycorrhizal (ERM) fungal diversity and distribution. Terminal-rest...
Article
Full-text available
Like other myco-heterotrophic plants, Pterospora andromedea (pinedrops) is dependent upon its specific fungal symbionts for survival. The rarity of pinedrops fungal symbiont was investigated in the eastern United States where pinedrops are rare. Wild populations of eastern pinedrops were sampled, and the plant haplotypes and fungal symbionts were c...
Article
Full-text available
Approximately 92% of the U.S. population of American hart's-tongue fern (Phyllitis scolopendrium var. americana) is found in Onondaga and Madison counties, New York, in 17 distinct colonies. All New York colonies have been periodically censused since 1916, though rarely in the same year. This study examines census data of the total New York populat...

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Projects

Projects (6)
Project
Greenhouse and field microcosm experiments will be used to target and differentiate between the response of arbuscular mycorrhizal fungi, nitrogen cycling prokaryotes and plants for determination of their respective contribution to the nitrogen cycle and the mediation of nitrogen pollution under different rates of nitrogen fertilizer input.