Persisting responses of salt marsh fungal communities to the Deepwater Horizon oil spill

Lumibao, Candice Y.; Formel, Stephen K.; Elango, Vijaikrishnah; Pardue, John H.; Blum, Michael J.; Bael, Sunshine A. Van

doi:10.1016/j.scitotenv.2018.06.077

Cited by 25 publications

(9 citation statements)

References 48 publications

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“…We documented significant effects of a broadly distributed marine dark septate endophyte (Kandalepas et al, 2015; Lumibao et al, 2018) on the morphology, biomass, and biomass allocation of the dominant marsh plant species, S. alterniflora . For some above‐ and belowground traits, the effects of Lulwoana on S. alterniflora were consistently negative, in contrast to prior results that grasses tend to benefit from DSE (Mandyam et al, 2012; Mayerhofer et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Although S. alterniflora is colonized by a diverse suite of root‐associated fungi (Kandalepas et al, 2015), little is known regarding the roles of these endosymbionts in salt marshes. S. alterniflora is not mycorrhizal (McHugh and Dighton, 2004; Daleo et al, 2008), but it is commonly colonized by other root‐associated fungi, including DSE (Kandalepas et al, 2015; Lumibao et al, 2018). These DSE are responsive to variation in environmental conditions (Kandalepas et al, 2015; Moore et al, in press), and they may influence S. alterniflora growth and biomass (A. R. Hughes and C. Gehring, unpublished data).…”

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confidence: 99%

“…Although the biology of Lulwoana sp. is poorly known, it is in the family Lulworthiaceae , which includes the dominant root endophytes of S. alterniflora at some sites in the northern Gulf Coast (Kandalepas et al, 2015; Lumibao et al, 2018). Prior studies have shown substantial variation across S. alterniflora genotypes in key plant traits (e.g., stem height, stem production) and both plant–plant and plant–consumer interactions (Proffit et al, 2003, 2005; Hughes, 2014; Zerebecki et al, 2017).…”

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confidence: 99%

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Plant response to fungal root endophytes varies by host genotype in the foundation species Spartina alterniflora

Hughes

Moore

Gehring

2020

American J of Botany

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Plants and their interactions with root-associated fungi have wide-reaching ecological effects, from influencing individual traits to modifying interactions with other species to affecting biodiversity and biogeochemical cycles (Johnson et al., 2012). While mycorrhizal fungi have long been of interest, there is growing evidence that other root-associated fungi markedly influence host plant structural and physiological traits, particularly when mycorrhizal fungi are absent or in low abundance (Porras-Alfaro and Bayman, 2011; Clemmensen et al., 2013; Kivlin et al., 2013; Berthelot et al., 2019). Plant trait differences can result from functions provided by fungal endophytes, including the production of secondary metabolites with antibacterial properties and hormones that influence plant growth and biomass allocation (Andrade-Linares and Franken, 2013; Berthelot et al., 2019). Dark septate endophytes (DSE) are a polyphyletic fungal endophyte group with high colonization rates in the roots of a broad range of host plants in nearly all biomes (Mandyam and Jumpponen, 2008, 2014; Newsham, 2011) and with melanized hyphae that may allow them to withstand extreme conditions (Jumpponen and Trappe, 1998; Kivlin et al., 2013). Unlike mycorrhizal fungi, DSE do not have specialized structures for resource exchange with host plants, but their presence is associated with increased plant shoot nitrogen and phosphorus concentrations (Newsham, 2011). Recent genomic evidence suggests that DSE have a spectrum of enzymes capable of degrading organic matter (Knapp et al., 2018), consistent with an ability to increase nutrient availability to plants, particularly in nutrient-poor soils (Newsham, 2011; Knapp et al., 2018). Dark septate endophytes can also protect against plant pathogens (Andrade-Linares and

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Plant response to fungal root endophytes varies by host genotype in the foundation species Spartina alterniflora

Hughes

Moore

Gehring

2020

American J of Botany

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“…Environmental changes in abiotic conditions such as host nutrient supply, and in biotic factors (e.g., herbivory or competition) across the landscape can influence the composition and diversity of microbial assemblages (Giauque & Hawkes, ; Kerekes et al, ; Lumibao et al, ; Pancher et al, ). Nutrient addition can alter host plant resources available to microbial symbionts, which can alter abundances of specific fungal taxa associated with the plant host.…”

Section: Introductionmentioning

confidence: 99%

Site‐specific responses of foliar fungal microbiomes to nutrient addition and herbivory at different spatial scales

Lumibao

Borer

Condon

et al. 2019

Ecology and Evolution

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The plant microbiome can affect host function in many ways and characterizing the ecological factors that shape endophytic (microbes living inside host plant tissues) community diversity is a key step in understanding the impacts of environmental change on these communities. Phylogenetic relatedness among members of a community offers a way of quantifying phylogenetic diversity of a community and can provide insight into the ecological factors that shape endophyte microbiomes. We examined the effects of experimental nutrient addition and herbivory exclusion on the phylogenetic diversity of foliar fungal endophyte communities of the grass species Andropogon gerardii at four sites in the Great Plains of the central USA. Using amplicon sequencing, we characterized the effects of fertilization and herbivory on fungal community phylogenetic diversity at spatial scales that spanned within‐host to between sites across the Great Plains. Despite increasing fungal diversity and richness, at larger spatial scales, fungal microbiomes were composed of taxa showing random phylogenetic associations. Phylogenetic diversity did not differ systematically when summed across increasing spatial scales from a few meters within plots to hundreds of kilometers among sites. We observed substantial shifts in composition across sites, demonstrating distinct but similarly diverse fungal communities were maintained within sites across the region. In contrast, at the scale of within leaves, fungal communities tended to be comprised of closely related taxa regardless of the environment, but there were no shifts in phylogenetic composition among communities. We also found that nutrient addition (fertilization) and herbivory have varying effects at different sites. These results suggest that the direction and magnitude of the outcomes of environmental modifications likely depend on the spatial scale considered, and can also be constrained by regional site differences in microbial diversity and composition.

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“…Amongst the eukaryotes, the community composition shifted more toward fungi in the benthos (Bik et al, 2012) and salt marshes (Lumibao et al, 2018). This is not surprising as fungi have been shown to tolerate and degrade oil either directly (Davies and Westlake, 1979;Al-Nasrawi, 2012) or in conjunction with extracellular enzymes (Verdin et al, 2004;Asemoloye et al, 2018).…”

Section: How Do Microbes Respond To Oil and Dispersants?mentioning

confidence: 98%

Aggregation and Degradation of Dispersants and Oil by Microbial Exopolymers (ADDOMEx): Toward a Synthesis of Processes and Pathways of Marine Oil Snow Formation in Determining the Fate of Hydrocarbons

Quigg

Santschi

et al. 2021

Front. Mar. Sci.

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Microbes (bacteria, phytoplankton) in the ocean are responsible for the copious production of exopolymeric substances (EPS) that include transparent exopolymeric particles. These materials act as a matrix to form marine snow. After the Deepwater Horizon oil spill, marine oil snow (MOS) formed in massive quantities and influenced the fate and transport of oil in the ocean. The processes and pathways of MOS formation require further elucidation to be better understood, in particular we need to better understand how dispersants affect aggregation and degradation of oil. Toward that end, recent work has characterized EPS as a function of microbial community and environmental conditions. We present a conceptual model that incorporates recent findings in our understanding of the driving forces of MOS sedimentation and flocculent accumulation (MOSSFA) including factors that influence the scavenging of oil into MOS and the routes that promote decomposition of the oil post MOS formation. In particular, the model incorporates advances in our understanding of processes that control interactions between oil, dispersant, and EPS in producing either MOS that can sink or dispersed gels promoting microbial degradation of oil compounds. A critical element is the role of protein to carbohydrate ratios (P/C ratios) of EPS in the aggregation process of colloid and particle formation. The P/C ratio of EPS provides a chemical basis for the “stickiness” factor that is used in analytical or numerical simulations of the aggregation process. This factor also provides a relative measure for the strength of attachment of EPS to particle surfaces. Results from recent laboratory experiments demonstrate (i) the rapid formation of microbial assemblages, including their EPS, on oil droplets that is enhanced in the presence of Corexit-dispersed oil, and (ii) the subsequent rapid oil oxidation and microbial degradation in water. These findings, combined with the conceptual model, further improve our understanding of the fate of the sinking MOS (e.g., subsequent sedimentation and preservation/degradation) and expand our ability to predict the behavior and transport of spilled oil in the ocean, and the potential effects of Corexit application, specifically with respect to MOS processes (i.e., formation, fate, and half-lives) and Marine Oil Snow Sedimentation and Flocculent Accumulation.

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Persisting responses of salt marsh fungal communities to the Deepwater Horizon oil spill

Cited by 25 publications

References 48 publications

Plant response to fungal root endophytes varies by host genotype in the foundation species Spartina alterniflora

Plant response to fungal root endophytes varies by host genotype in the foundation species Spartina alterniflora

Site‐specific responses of foliar fungal microbiomes to nutrient addition and herbivory at different spatial scales

Aggregation and Degradation of Dispersants and Oil by Microbial Exopolymers (ADDOMEx): Toward a Synthesis of Processes and Pathways of Marine Oil Snow Formation in Determining the Fate of Hydrocarbons

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