Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS
The infective stage of Haemonchus contortus, the third-stage larva, retains the second-stage larval cuticle. Exsheathment takes place in the rumen of the host (Somerville, 1954), under the influence of a number of factors, chiefly unionized carbonic acid and dissolved gaseous carbon dioxide (Rogers,...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.507.6402 2023-05-15T15:52:45+02:00 Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS C. Ellenby The Pennsylvania State University CiteSeerX Archives 1968 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.6402 http://jeb.biologists.org/content/49/2/469.full.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.6402 http://jeb.biologists.org/content/49/2/469.full.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://jeb.biologists.org/content/49/2/469.full.pdf text 1968 ftciteseerx 2016-01-08T09:27:18Z The infective stage of Haemonchus contortus, the third-stage larva, retains the second-stage larval cuticle. Exsheathment takes place in the rumen of the host (Somerville, 1954), under the influence of a number of factors, chiefly unionized carbonic acid and dissolved gaseous carbon dioxide (Rogers, 1960). The ensheathed larva survives desiccation, but, if caused to exsheathe by appropriate treatment, it soon succumbs if dried. This aspect of sheath function is therefore clear; but the mechanism by which survival is improved is obscure. Rogers & Sommerville (1960) showed that the sheath is permeable to water and they therefore consider (1963) that it 'seems unlikely to prevent the larva from becoming desiccated'. The infective larva of the potato-root eelworm Heterodera rostochiensis survives prolonged desiccation inside the egg-shell, but it is very susceptible to drying once it has hatched (Ellenby, 19683). The free larva loses water much more rapidly than the enclosed larva; it was therefore suggested that the egg-shell, freely permeable when wet, becomes impermeable as it dries and that the reduction in the rate at which the larva dries helps it to survive. The hypothesis that the same sort of mechanism may operate in Haemonchus contortus is examined in the present work. Text Carbonic acid Unknown Somerville ENVELOPE(-64.307,-64.307,-65.376,-65.376) |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
The infective stage of Haemonchus contortus, the third-stage larva, retains the second-stage larval cuticle. Exsheathment takes place in the rumen of the host (Somerville, 1954), under the influence of a number of factors, chiefly unionized carbonic acid and dissolved gaseous carbon dioxide (Rogers, 1960). The ensheathed larva survives desiccation, but, if caused to exsheathe by appropriate treatment, it soon succumbs if dried. This aspect of sheath function is therefore clear; but the mechanism by which survival is improved is obscure. Rogers & Sommerville (1960) showed that the sheath is permeable to water and they therefore consider (1963) that it 'seems unlikely to prevent the larva from becoming desiccated'. The infective larva of the potato-root eelworm Heterodera rostochiensis survives prolonged desiccation inside the egg-shell, but it is very susceptible to drying once it has hatched (Ellenby, 19683). The free larva loses water much more rapidly than the enclosed larva; it was therefore suggested that the egg-shell, freely permeable when wet, becomes impermeable as it dries and that the reduction in the rate at which the larva dries helps it to survive. The hypothesis that the same sort of mechanism may operate in Haemonchus contortus is examined in the present work. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
C. Ellenby |
spellingShingle |
C. Ellenby Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS |
author_facet |
C. Ellenby |
author_sort |
C. Ellenby |
title |
Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS |
title_short |
Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS |
title_full |
Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS |
title_fullStr |
Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS |
title_full_unstemmed |
Printed in Great Britain DESICCATION SURVIVAL OF THE INFECTIVE LARVA OF HAEMONCHUS CONTORTUS |
title_sort |
printed in great britain desiccation survival of the infective larva of haemonchus contortus |
publishDate |
1968 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.6402 http://jeb.biologists.org/content/49/2/469.full.pdf |
long_lat |
ENVELOPE(-64.307,-64.307,-65.376,-65.376) |
geographic |
Somerville |
geographic_facet |
Somerville |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
http://jeb.biologists.org/content/49/2/469.full.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.6402 http://jeb.biologists.org/content/49/2/469.full.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766387857830707200 |