Data · collection
The temperature and desiccation tolerance limits of protozoa found in glacial melt waters and freshwater ponds or streams at Cape Bird
Listed in NASA Earthdata CMR
Protozoa found in the glacial melt waters and freshwater ponds or streams of Antarctica were investigated for their ability to tolerate freezing in their active stages.
Description
Sampling was conducted at Cape Bird in both the northern and middle colonies so as to include as wide a range of aquatic environments as possible ranging from glacial melt waters to warm eutrophic ponds. Analysis of samples found about 20 species of protozoa and they were cultured in the field in petri dishes with water and a piece of raw meat.
A number of each species was fixed for examination with both a light microscope and a scanning electron microscope in New Zealand. Samples of all species were tested for their ability to withstand freezing, by cooling them at different rates to temperatures of between -5C and -10C. High mortality was found.
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These animals are exposed to low temperatures over the winter and therefore the study examined the factors which determined the occurrence of particular species of protozoa in specific localities and microenvironments. Samples were collected, dried and weighed and then rehydrated. The microfaunal content of the samples was then examined at intervals during the next 36 hours for survival.
In addition, the protozoan tolerance to high temperatures was investigated.
Links
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214593999-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214593999-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Amoeboids · Ciliates · Diatoms · Evolutionary Adaptation · FIELD INVESTIGATION · Flagellates · LABORATORY · Not provided · Rivers/Stream · WATER BOTTLES
- Inferred from text
- Physical geography and environmental geoscience 69%
Provenance · 1 source records, 17 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214593999-SCIOPS | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:group:3709 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (69%) |
| concepts[instrument].gcmd_instrument:water-bottles | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/protists/amoeboids | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/protists/ciliates | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/protists/diatoms | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/protists/flagellates | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biosphere/ecological-dynamics/species-population-interactions/evolutionary-adaptation | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biosphere/ecosystems/freshwater-ecosystems/rivers-stream | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:field-investigation | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:laboratory | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:not-provided | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |