High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal
Abstract Host‐specialist parasites of endangered large vertebrates are in many cases more endangered than their hosts. In particular, low host population densities and reduced among‐host transmission rates are expected to lead to inbreeding within parasite infrapopulations living on single host indi...
Published in: | Molecular Ecology |
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Online Access: | http://dx.doi.org/10.1111/mec.16569 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16569 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.16569 |
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crwiley:10.1111/mec.16569 2024-10-06T13:52:11+00:00 High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal Virrueta Herrera, Stephany Johnson, Kevin P. Sweet, Andrew D. Ylinen, Eeva Kunnasranta, Mervi Nyman, Tommi Academy of Finland Societas Pro Fauna et Flora Fennica 2022 http://dx.doi.org/10.1111/mec.16569 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16569 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.16569 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Molecular Ecology volume 31, issue 18, page 4593-4606 ISSN 0962-1083 1365-294X journal-article 2022 crwiley https://doi.org/10.1111/mec.16569 2024-09-11T04:16:08Z Abstract Host‐specialist parasites of endangered large vertebrates are in many cases more endangered than their hosts. In particular, low host population densities and reduced among‐host transmission rates are expected to lead to inbreeding within parasite infrapopulations living on single host individuals. Furthermore, spatial population structures of directly‐transmitted parasites should be concordant with those of their hosts. Using population genomic approaches, we investigated inbreeding and population structure in a host‐specialist seal louse ( Echinophthirius horridus ) infesting the Saimaa ringed seal ( Phoca hispida saimensis ), which is endemic to Lake Saimaa in Finland, and is one of the most endangered pinnipeds in the world. We conducted genome resequencing of pairs of lice collected from 18 individual Saimaa ringed seals throughout the Lake Saimaa complex. Our analyses showed high genetic similarity and inbreeding between lice inhabiting the same individual seal host, indicating low among‐host transmission rates. Across the lake, genetic differentiation among individual lice was correlated with their geographic distance, and assignment analyses revealed a marked break in the genetic variation of the lice in the middle of the lake, indicating substantial population structure. These findings indicate that movements of Saimaa ringed seals across the main breeding areas of the fragmented Lake Saimaa complex may in fact be more restricted than suggested by previous population‐genetic analyses of the seals themselves. Article in Journal/Newspaper Phoca hispida ringed seal Wiley Online Library Molecular Ecology 31 18 4593 4606 |
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Wiley Online Library |
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English |
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Abstract Host‐specialist parasites of endangered large vertebrates are in many cases more endangered than their hosts. In particular, low host population densities and reduced among‐host transmission rates are expected to lead to inbreeding within parasite infrapopulations living on single host individuals. Furthermore, spatial population structures of directly‐transmitted parasites should be concordant with those of their hosts. Using population genomic approaches, we investigated inbreeding and population structure in a host‐specialist seal louse ( Echinophthirius horridus ) infesting the Saimaa ringed seal ( Phoca hispida saimensis ), which is endemic to Lake Saimaa in Finland, and is one of the most endangered pinnipeds in the world. We conducted genome resequencing of pairs of lice collected from 18 individual Saimaa ringed seals throughout the Lake Saimaa complex. Our analyses showed high genetic similarity and inbreeding between lice inhabiting the same individual seal host, indicating low among‐host transmission rates. Across the lake, genetic differentiation among individual lice was correlated with their geographic distance, and assignment analyses revealed a marked break in the genetic variation of the lice in the middle of the lake, indicating substantial population structure. These findings indicate that movements of Saimaa ringed seals across the main breeding areas of the fragmented Lake Saimaa complex may in fact be more restricted than suggested by previous population‐genetic analyses of the seals themselves. |
author2 |
Academy of Finland Societas Pro Fauna et Flora Fennica |
format |
Article in Journal/Newspaper |
author |
Virrueta Herrera, Stephany Johnson, Kevin P. Sweet, Andrew D. Ylinen, Eeva Kunnasranta, Mervi Nyman, Tommi |
spellingShingle |
Virrueta Herrera, Stephany Johnson, Kevin P. Sweet, Andrew D. Ylinen, Eeva Kunnasranta, Mervi Nyman, Tommi High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal |
author_facet |
Virrueta Herrera, Stephany Johnson, Kevin P. Sweet, Andrew D. Ylinen, Eeva Kunnasranta, Mervi Nyman, Tommi |
author_sort |
Virrueta Herrera, Stephany |
title |
High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal |
title_short |
High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal |
title_full |
High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal |
title_fullStr |
High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal |
title_full_unstemmed |
High levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal |
title_sort |
high levels of inbreeding with spatial and host‐associated structure in lice of an endangered freshwater seal |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1111/mec.16569 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16569 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.16569 |
genre |
Phoca hispida ringed seal |
genre_facet |
Phoca hispida ringed seal |
op_source |
Molecular Ecology volume 31, issue 18, page 4593-4606 ISSN 0962-1083 1365-294X |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1111/mec.16569 |
container_title |
Molecular Ecology |
container_volume |
31 |
container_issue |
18 |
container_start_page |
4593 |
op_container_end_page |
4606 |
_version_ |
1812180530406359040 |