Abstract The nematode worm Scottnema lindsayae
(Cephalobidae) was found near the base of the Beard-more Glacier in the Transantarctic Mountains 83.48°S, over 5 ° further south than previously recorded. Identi-Wcation was conWrmed using morphological analyses of males, females and juvenile stages, and by DNA sequencing of the ITS1 region of the r...
Other Authors: | |
---|---|
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.664.8645 http://adamslab.byu.edu/Portals/74/docs/Papers/Adams2007Polar+Biology.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.664.8645 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.664.8645 2023-05-15T13:49:52+02:00 Abstract The nematode worm Scottnema lindsayae The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.664.8645 http://adamslab.byu.edu/Portals/74/docs/Papers/Adams2007Polar+Biology.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.664.8645 http://adamslab.byu.edu/Portals/74/docs/Papers/Adams2007Polar+Biology.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://adamslab.byu.edu/Portals/74/docs/Papers/Adams2007Polar+Biology.pdf text ftciteseerx 2016-01-08T17:02:57Z (Cephalobidae) was found near the base of the Beard-more Glacier in the Transantarctic Mountains 83.48°S, over 5 ° further south than previously recorded. Identi-Wcation was conWrmed using morphological analyses of males, females and juvenile stages, and by DNA sequencing of the ITS1 region of the ribosomal RNA tandem repeat unit. These data revealed no discern-able morphological or ITS rDNA sequence variation between the extreme southern population of S. lind-sayae and disparate populations from the McMurdo Dry Valleys in south Victoria Land (77–78°S). Based on these results, we suggest that broadcast dispersal, with accompanying high rates of gene Xow, establish the extreme southern distribution of the phylum Nem-atoda. High abundance, low rates of diversiWcation and lack of an apparent biogeographic structure across lati-tudinal and environmental gradients implies that their presence in simple Antarctic soil ecosystems is stable, so long as physical and biological controls on their dis-tributions remain within viable parameters. Recent evidence that S. lindsayae populations are in decline suggests that their high dispersal rates are insuYcient to buVer current, unfavorable environmental changes and may foreshadow longer-term ecosystem disrup-tion. Text Antarc* Antarctic McMurdo Dry Valleys Victoria Land Unknown Antarctic McMurdo Dry Valleys Transantarctic Mountains Victoria Land |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
(Cephalobidae) was found near the base of the Beard-more Glacier in the Transantarctic Mountains 83.48°S, over 5 ° further south than previously recorded. Identi-Wcation was conWrmed using morphological analyses of males, females and juvenile stages, and by DNA sequencing of the ITS1 region of the ribosomal RNA tandem repeat unit. These data revealed no discern-able morphological or ITS rDNA sequence variation between the extreme southern population of S. lind-sayae and disparate populations from the McMurdo Dry Valleys in south Victoria Land (77–78°S). Based on these results, we suggest that broadcast dispersal, with accompanying high rates of gene Xow, establish the extreme southern distribution of the phylum Nem-atoda. High abundance, low rates of diversiWcation and lack of an apparent biogeographic structure across lati-tudinal and environmental gradients implies that their presence in simple Antarctic soil ecosystems is stable, so long as physical and biological controls on their dis-tributions remain within viable parameters. Recent evidence that S. lindsayae populations are in decline suggests that their high dispersal rates are insuYcient to buVer current, unfavorable environmental changes and may foreshadow longer-term ecosystem disrup-tion. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
Abstract The nematode worm Scottnema lindsayae |
spellingShingle |
Abstract The nematode worm Scottnema lindsayae |
title_short |
Abstract The nematode worm Scottnema lindsayae |
title_full |
Abstract The nematode worm Scottnema lindsayae |
title_fullStr |
Abstract The nematode worm Scottnema lindsayae |
title_full_unstemmed |
Abstract The nematode worm Scottnema lindsayae |
title_sort |
abstract the nematode worm scottnema lindsayae |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.664.8645 http://adamslab.byu.edu/Portals/74/docs/Papers/Adams2007Polar+Biology.pdf |
geographic |
Antarctic McMurdo Dry Valleys Transantarctic Mountains Victoria Land |
geographic_facet |
Antarctic McMurdo Dry Valleys Transantarctic Mountains Victoria Land |
genre |
Antarc* Antarctic McMurdo Dry Valleys Victoria Land |
genre_facet |
Antarc* Antarctic McMurdo Dry Valleys Victoria Land |
op_source |
http://adamslab.byu.edu/Portals/74/docs/Papers/Adams2007Polar+Biology.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.664.8645 http://adamslab.byu.edu/Portals/74/docs/Papers/Adams2007Polar+Biology.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766252449865138176 |