Abstract Three species of Antarctic mites, Alaskozetes
gerlachei, are abundant in the vicinity of Palmer Station, Antarctica. No single mechanism for reducing water stress was shared by all three species. A. antarcticus and R. gerlachei (both ca. 200 lg) are over twice as large as H. antarcticus (ca. 90 lg), but all had similar body water content (67%)...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.537.8180 2023-05-15T13:09:55+02:00 Abstract Three species of Antarctic mites, Alaskozetes Hydrogamasellus Antarcticus The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.537.8180 http://www.units.muohio.edu/cryolab/publications/documents/Benoitetal2008.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.537.8180 http://www.units.muohio.edu/cryolab/publications/documents/Benoitetal2008.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.units.muohio.edu/cryolab/publications/documents/Benoitetal2008.pdf text ftciteseerx 2016-01-08T10:53:49Z gerlachei, are abundant in the vicinity of Palmer Station, Antarctica. No single mechanism for reducing water stress was shared by all three species. A. antarcticus and R. gerlachei (both ca. 200 lg) are over twice as large as H. antarcticus (ca. 90 lg), but all had similar body water content (67%) and tolerated a loss of up to 35 % of their body water before succumbing to dehydration. All imbibed free water and had the capacity to reduce water loss behaviorally by forming clusters. Alaskozetes antarcticus was distinct in that it relied heavily on water conservation (xerophilic classification) that was largely achieved by its thick cuticular armor, a feature shared by all members of this suborder (Oribatida), and abundant cuticular hydrocarbons. In com-parison to the other two species, A. antarcticus was coated with 2–39 the amount of cuticular hydrocarbons, had a 20-fold reduction in net transpiration rate, and had a critical transition temperature (CTT) that indicates a pronounced suppression in activation energy (Ea) at temperatures below 25C. In contrast, H. antarcticus and R. gerlachei lack a CTT, have lower amounts of cuticular hydrocarbons and have low Eas and high net transpiration rates, classifying them as hydrophilic. Only H. antarcticus was capable of utilizing water vapor to replenish its water stores, but it could do so only at relative humidities close to saturation (95–98 %RH). Thus, H. antarcticus and R. gerlachei require wet habitats and low temperature to counter water loss, and replace lost water behaviorally through predation. Compared to mites from the temperate zone, all three Antarctic species had a lower water content, a feature that commonly enhances cold tolerance. Text Alaskozetes antarcticus Antarc* Antarctic Antarctica antarcticus Unknown Antarctic Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
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English |
description |
gerlachei, are abundant in the vicinity of Palmer Station, Antarctica. No single mechanism for reducing water stress was shared by all three species. A. antarcticus and R. gerlachei (both ca. 200 lg) are over twice as large as H. antarcticus (ca. 90 lg), but all had similar body water content (67%) and tolerated a loss of up to 35 % of their body water before succumbing to dehydration. All imbibed free water and had the capacity to reduce water loss behaviorally by forming clusters. Alaskozetes antarcticus was distinct in that it relied heavily on water conservation (xerophilic classification) that was largely achieved by its thick cuticular armor, a feature shared by all members of this suborder (Oribatida), and abundant cuticular hydrocarbons. In com-parison to the other two species, A. antarcticus was coated with 2–39 the amount of cuticular hydrocarbons, had a 20-fold reduction in net transpiration rate, and had a critical transition temperature (CTT) that indicates a pronounced suppression in activation energy (Ea) at temperatures below 25C. In contrast, H. antarcticus and R. gerlachei lack a CTT, have lower amounts of cuticular hydrocarbons and have low Eas and high net transpiration rates, classifying them as hydrophilic. Only H. antarcticus was capable of utilizing water vapor to replenish its water stores, but it could do so only at relative humidities close to saturation (95–98 %RH). Thus, H. antarcticus and R. gerlachei require wet habitats and low temperature to counter water loss, and replace lost water behaviorally through predation. Compared to mites from the temperate zone, all three Antarctic species had a lower water content, a feature that commonly enhances cold tolerance. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Hydrogamasellus Antarcticus |
spellingShingle |
Hydrogamasellus Antarcticus Abstract Three species of Antarctic mites, Alaskozetes |
author_facet |
Hydrogamasellus Antarcticus |
author_sort |
Hydrogamasellus Antarcticus |
title |
Abstract Three species of Antarctic mites, Alaskozetes |
title_short |
Abstract Three species of Antarctic mites, Alaskozetes |
title_full |
Abstract Three species of Antarctic mites, Alaskozetes |
title_fullStr |
Abstract Three species of Antarctic mites, Alaskozetes |
title_full_unstemmed |
Abstract Three species of Antarctic mites, Alaskozetes |
title_sort |
abstract three species of antarctic mites, alaskozetes |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.537.8180 http://www.units.muohio.edu/cryolab/publications/documents/Benoitetal2008.pdf |
long_lat |
ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
geographic |
Antarctic Palmer Station Palmer-Station |
geographic_facet |
Antarctic Palmer Station Palmer-Station |
genre |
Alaskozetes antarcticus Antarc* Antarctic Antarctica antarcticus |
genre_facet |
Alaskozetes antarcticus Antarc* Antarctic Antarctica antarcticus |
op_source |
http://www.units.muohio.edu/cryolab/publications/documents/Benoitetal2008.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.537.8180 http://www.units.muohio.edu/cryolab/publications/documents/Benoitetal2008.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766204161401028608 |