NOTES ON THE ECOLOGY OF A SPECIES OF <i>ZYGOGONIUM</i> (KÜTZ.) IN YELLOWSTONE NATIONAL PARK

Lynn, Raymond I.; Brock, Thomas D.

doi:10.1111/j.1529-8817.1969.tb02600.x

Cited by 26 publications

(15 citation statements)

References 12 publications

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“…4) seems to prefer acid habitats and may be the dominant taxon found in extremely low pH waters (Lynn and Brock, 1969;Transeau, 1951). For example, the genus Zygogonium ( Fig.…”

Section: Ecology and Distributionmentioning

confidence: 99%

Conjugating Green Algae Including Desmids

Hall

McCourt

2015

Freshwater Algae of North America

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“…4) seems to prefer acid habitats and may be the dominant taxon found in extremely low pH waters (Lynn and Brock, 1969;Transeau, 1951). For example, the genus Zygogonium ( Fig.…”

Section: Ecology and Distributionmentioning

confidence: 99%

Conjugating Green Algae Including Desmids

Hall

McCourt

2015

Freshwater Algae of North America

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“…Summary of literature dealing with benthic eukaryotes commonly reported in aquatic environments of pHArchilla et al 2001;Aguilera et al 2007a;Valente & Gomes 2007Lynn & Brock 1969Hargreaves et al 1975;Aguilera et al 2006;Kleeberg et al 2006 …”

mentioning

confidence: 99%

Eukaryote-Dominated Biofilms and Their Significance in Acidic Environments

Brake¹,

Hasiotis²

2010

Geomicrobiology Journal

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Biodiversity of benthic eukaryotic microorganisms in highly acidic (pH ≤ 3.5) aquatic environments is limited to species that have developed strategies to tolerate elevated concentrations of H + and dissolved metals and low nutrients levels that commonly characterize these environments. To survive adverse conditions, some algae, protozoa, and fungi have developed mechanisms to make their cell membranes impermeable to protons and maintain cytosolic pH at near neutral levels; others have developed a cell boundary mechanism that blocks H + ions from entering the cell. High concentrations of heavy metals are also toxic, adversely impacting growth by disrupting physiological, biochemical, or metabolic processes. Some algae, fungi, and protozoans are able to tolerate high metal concentrations via metal complexation outside the cell, extracellular binding and precipitation of metals, reduced metal uptake, increased metal efflux, and detoxification or compartmentalization of metals within the cell. In acidic environments, benthic eukaryotic microorganisms form biofilm communities in which they are the dominant members numerically and ecologically. Eukaryotedominated benthic communities produce heterogeneous microenvironments that vary spatially and temporally in their physicochemical character. The eukaryotes in these biofilms can be considered ecosystem engineers as they directly or indirectly modulate the availability of resources to other species within the biofilm. These eukaryote-dominated communities may play a significant role in mediating their environment by actively and passively contributing to metal attenuation through various processes of biosorption and via formation of laminated organosedimentary structures, which may be used as analogs for similar structures in the rock record.

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“…In the purple filaments from Site 3, OTUs affiliated with the green alga Zygnematophyceae (Zygogonium) accounted for the majority of sequences recovered (∼98%). Mats of Zygogonium filaments are common in and near acidic geothermal springs with temperatures below 40 • C (Lynn and Brock, 1969) (Site 3: pH of 3.87, 29.4 • C). The recovery of abundant 18S rRNA OTUs affiliated with Zygnematophyceae from Site 3 suggests the light-dependent inorganic carbon uptake observed can be attributed to this eukaryotic oxygenic phototroph.…”

Section: Eukaryamentioning

confidence: 99%

Hot Spring Microbial Community Composition, Morphology, and Carbon Fixation: Implications for Interpreting the Ancient Rock Record

2017

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Microbial communities in hydrothermal systems exist in a range of macroscopic morphologies including stromatolites, mats, and filaments. The architects of these structures are typically autotrophic, serving as primary producers. Structures attributed to microbial life have been documented in the rock record dating back to the Archean including recent reports of microbially-related structures in terrestrial hot springs that date back as far as 3.5 Ga. Microbial structures exhibit a range of complexity from filaments to more complex mats and stromatolites and the complexity impacts preservation potential. As a result, interpretation of these structures in the rock record relies on isotopic signatures in combination with overall morphology and paleoenvironmental setting. However, the relationships between morphology, microbial community composition, and primary productivity remain poorly constrained. To begin to address this gap, we examined community composition and carbon fixation in filaments, mats, and stromatolites from the Greater Obsidian Pool Area (GOPA) of the Mud Volcano Area, Yellowstone National Park, WY. We targeted morphologies dominated by bacterial phototrophs located in close proximity within the same pool which are exposed to similar geochemistry as well as bacterial mat, algal filament and chemotrophic filaments from nearby springs. Our results indicate (i) natural abundance δ 13 C values of biomass from these features (−11.0 to −24.3‰) are similar to those found in the rock record; (ii) carbon uptake rates of photoautotrophic communities is greater than chemoautotrophic; (iii) oxygenic photosynthesis, anoxygenic photosynthesis, and chemoautotrophy often contribute to carbon fixation within the same morphology; and (iv) increasing phototrophic biofilm complexity corresponds to a significant decrease in rates of carbon fixation-filaments had the highest uptake rates whereas carbon fixation by stromatolites was significantly lower. Our data highlight important differences in primary productivity between structures despite indistinguishable δ 13 C values of the biomass. Furthermore, low primary productivity by stromatolites compared to other structures underscores the need to consider a larger role for microbial mats and filaments in carbon fixation and O 2 generation during the Archean and Proterozoic.

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NOTES ON THE ECOLOGY OF A SPECIES OF ZYGOGONIUM (KÜTZ.) IN YELLOWSTONE NATIONAL PARK

Cited by 26 publications

References 12 publications

Conjugating Green Algae Including Desmids

Conjugating Green Algae Including Desmids

Eukaryote-Dominated Biofilms and Their Significance in Acidic Environments

Hot Spring Microbial Community Composition, Morphology, and Carbon Fixation: Implications for Interpreting the Ancient Rock Record

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