Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina )
Three species of anisakine nematodes (Pseudoterranova decipiens, Contracaecum osculatum, Anisakis simplex) co-occur in the stomachs of Sable Island harbour seals (Phoca vitulina). The sealworm, P. decipiens, was the commonest nematode in these seals. Anisakis simplex was found in much smaller number...
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crcansciencepubl:10.1139/z02-016 2023-12-17T10:31:17+01:00 Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina ) Stobo, Wayne T Fanning, L Paul Beck, Brian Fowler, G Mark 2002 http://dx.doi.org/10.1139/z02-016 http://www.nrcresearchpress.com/doi/pdf/10.1139/z02-016 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 80, issue 3, page 442-449 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2002 crcansciencepubl https://doi.org/10.1139/z02-016 2023-11-19T13:39:09Z Three species of anisakine nematodes (Pseudoterranova decipiens, Contracaecum osculatum, Anisakis simplex) co-occur in the stomachs of Sable Island harbour seals (Phoca vitulina). The sealworm, P. decipiens, was the commonest nematode in these seals. Anisakis simplex was found in much smaller numbers, none mature, indicating that the harbour seal is not a true final host to this parasite. Contracaecum osculatum was rare but half were mature. Pseudoterranova decipiens increased in abundance with size of the seal. An inverse relationship was observed between P. decipiens abundance and the age of seals of similar size, probably owing to changes in diet. Numbers of P. decipiens may have declined over the summer, coincident with an increase in the proportion of mature worms in the stomach. From similarities between the worm infections of grey seals (Halichoerus grypus) and harbour seals, we infer that A. simplex abundance may also exhibit a decline in abundance. Contracaecum osculatum was only encountered during the latter half of the year, suggesting an association with prey species of corresponding periodicity in their distribution. We estimate that the abundance of sealworm in harbour seals is about 2.5% of that carried by the grey seal population. This could imply that harbour seals represent an insignificant vector of the sealworm infecting commercial fish species in the Northwest Atlantic, provided density-dependent relationships exist between worm abundances in different host species. Article in Journal/Newspaper harbour seal Northwest Atlantic Phoca vitulina Canadian Science Publishing (via Crossref) Island Harbour ENVELOPE(70.067,70.067,-49.483,-49.483) Canadian Journal of Zoology 80 3 442 449 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Stobo, Wayne T Fanning, L Paul Beck, Brian Fowler, G Mark Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina ) |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Three species of anisakine nematodes (Pseudoterranova decipiens, Contracaecum osculatum, Anisakis simplex) co-occur in the stomachs of Sable Island harbour seals (Phoca vitulina). The sealworm, P. decipiens, was the commonest nematode in these seals. Anisakis simplex was found in much smaller numbers, none mature, indicating that the harbour seal is not a true final host to this parasite. Contracaecum osculatum was rare but half were mature. Pseudoterranova decipiens increased in abundance with size of the seal. An inverse relationship was observed between P. decipiens abundance and the age of seals of similar size, probably owing to changes in diet. Numbers of P. decipiens may have declined over the summer, coincident with an increase in the proportion of mature worms in the stomach. From similarities between the worm infections of grey seals (Halichoerus grypus) and harbour seals, we infer that A. simplex abundance may also exhibit a decline in abundance. Contracaecum osculatum was only encountered during the latter half of the year, suggesting an association with prey species of corresponding periodicity in their distribution. We estimate that the abundance of sealworm in harbour seals is about 2.5% of that carried by the grey seal population. This could imply that harbour seals represent an insignificant vector of the sealworm infecting commercial fish species in the Northwest Atlantic, provided density-dependent relationships exist between worm abundances in different host species. |
format |
Article in Journal/Newspaper |
author |
Stobo, Wayne T Fanning, L Paul Beck, Brian Fowler, G Mark |
author_facet |
Stobo, Wayne T Fanning, L Paul Beck, Brian Fowler, G Mark |
author_sort |
Stobo, Wayne T |
title |
Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina ) |
title_short |
Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina ) |
title_full |
Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina ) |
title_fullStr |
Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina ) |
title_full_unstemmed |
Abundance and maturity of three species of parasitic anisakine nematodes ( Pseudoterranova decipiens , Contracaecum osculatum , Anisakis simplex ) occurring in Sable Island harbour seals ( Phoca vitulina ) |
title_sort |
abundance and maturity of three species of parasitic anisakine nematodes ( pseudoterranova decipiens , contracaecum osculatum , anisakis simplex ) occurring in sable island harbour seals ( phoca vitulina ) |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/z02-016 http://www.nrcresearchpress.com/doi/pdf/10.1139/z02-016 |
long_lat |
ENVELOPE(70.067,70.067,-49.483,-49.483) |
geographic |
Island Harbour |
geographic_facet |
Island Harbour |
genre |
harbour seal Northwest Atlantic Phoca vitulina |
genre_facet |
harbour seal Northwest Atlantic Phoca vitulina |
op_source |
Canadian Journal of Zoology volume 80, issue 3, page 442-449 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z02-016 |
container_title |
Canadian Journal of Zoology |
container_volume |
80 |
container_issue |
3 |
container_start_page |
442 |
op_container_end_page |
449 |
_version_ |
1785584490108682240 |