Portrait of a Geothermal Spring, Hunter’s Hot Springs, Oregon
Although alkaline Hunter’s Hot Springs in southeastern Oregon has been studied extensively for over 40 years, most of these studies and the subsequent publications were before the advent of molecular methods. However, there are many field observations and laboratory experiments that reveal the major...
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-01-01
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| Series: | Life |
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| Online Access: | http://www.mdpi.com/2075-1729/5/1/332 |
| _version_ | 1828138896770203648 |
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| author | Richard W. Castenholz |
| author_facet | Richard W. Castenholz |
| author_sort | Richard W. Castenholz |
| collection | DOAJ |
| description | Although alkaline Hunter’s Hot Springs in southeastern Oregon has been studied extensively for over 40 years, most of these studies and the subsequent publications were before the advent of molecular methods. However, there are many field observations and laboratory experiments that reveal the major aspects of the phototrophic species composition within various physical and chemical gradients of these springs. Relatively constant temperature boundaries demark the upper boundary of the unicellular cyanobacterium, Synechococcus at 73–74 °C (the world-wide upper limit for photosynthesis), and 68–70 °C the upper limit for Chloroflexus. The upper limit for the cover of the filamentous cyanobacterium, Geitlerinema (Oscillatoria) is at 54–55 °C, and the in situ lower limit at 47–48 °C for all three of these phototrophs due to the upper temperature limit for the grazing ostracod, Thermopsis. The in situ upper limit for the cyanobacteria Pleurocapsa and Calothrix is at ~47–48 °C, which are more grazer-resistant and grazer dependent. All of these demarcations are easily visible in the field. In addition, there is a biosulfide production in some sections of the springs that have a large impact on the microbiology. Most of the temperature and chemical limits have been explained by field and laboratory experiments. |
| first_indexed | 2024-04-11T18:43:33Z |
| format | Article |
| id | doaj.art-e6b1085eed824713952ee61ee21bc4c9 |
| institution | Directory Open Access Journal |
| issn | 2075-1729 |
| language | English |
| last_indexed | 2024-04-11T18:43:33Z |
| publishDate | 2015-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Life |
| spelling | doaj.art-e6b1085eed824713952ee61ee21bc4c92022-12-22T04:08:55ZengMDPI AGLife2075-17292015-01-015133234710.3390/life5010332life5010332Portrait of a Geothermal Spring, Hunter’s Hot Springs, OregonRichard W. Castenholz0Institute of Ecology and Evolution, University of Oregon, Eugene, OR 97403, USAAlthough alkaline Hunter’s Hot Springs in southeastern Oregon has been studied extensively for over 40 years, most of these studies and the subsequent publications were before the advent of molecular methods. However, there are many field observations and laboratory experiments that reveal the major aspects of the phototrophic species composition within various physical and chemical gradients of these springs. Relatively constant temperature boundaries demark the upper boundary of the unicellular cyanobacterium, Synechococcus at 73–74 °C (the world-wide upper limit for photosynthesis), and 68–70 °C the upper limit for Chloroflexus. The upper limit for the cover of the filamentous cyanobacterium, Geitlerinema (Oscillatoria) is at 54–55 °C, and the in situ lower limit at 47–48 °C for all three of these phototrophs due to the upper temperature limit for the grazing ostracod, Thermopsis. The in situ upper limit for the cyanobacteria Pleurocapsa and Calothrix is at ~47–48 °C, which are more grazer-resistant and grazer dependent. All of these demarcations are easily visible in the field. In addition, there is a biosulfide production in some sections of the springs that have a large impact on the microbiology. Most of the temperature and chemical limits have been explained by field and laboratory experiments.http://www.mdpi.com/2075-1729/5/1/332hot springscyanobacteriachloroflexiostracodsthermophilesphotosynthesiseastern Oregon |
| spellingShingle | Richard W. Castenholz Portrait of a Geothermal Spring, Hunter’s Hot Springs, Oregon Life hot springs cyanobacteria chloroflexi ostracods thermophiles photosynthesis eastern Oregon |
| title | Portrait of a Geothermal Spring, Hunter’s Hot Springs, Oregon |
| title_full | Portrait of a Geothermal Spring, Hunter’s Hot Springs, Oregon |
| title_fullStr | Portrait of a Geothermal Spring, Hunter’s Hot Springs, Oregon |
| title_full_unstemmed | Portrait of a Geothermal Spring, Hunter’s Hot Springs, Oregon |
| title_short | Portrait of a Geothermal Spring, Hunter’s Hot Springs, Oregon |
| title_sort | portrait of a geothermal spring hunter s hot springs oregon |
| topic | hot springs cyanobacteria chloroflexi ostracods thermophiles photosynthesis eastern Oregon |
| url | http://www.mdpi.com/2075-1729/5/1/332 |
| work_keys_str_mv | AT richardwcastenholz portraitofageothermalspringhuntershotspringsoregon |