Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts

The freshwater pearl mussel, Margaritifera margaritifera, is an endangered bivalve which has suffered a serious decline across its Holarctic distribution. It has a complex life cycle which involves an obligate parasitic stage on a suitable host. M. margaritifera populations are very host specific, a...

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Published in:Parasitology Research
Main Author: Marwaha, Janhavi
Other Authors: orcid:0000-0002-8644-642X
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: The University of Bergen 2020
Subjects:
Online Access:http://hdl.handle.net/1956/21947
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spelling ftunivbergen:oai:bora.uib.no:1956/21947 2023-05-15T15:32:57+02:00 Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts Marwaha, Janhavi orcid:0000-0002-8644-642X 2020-04-01T12:48:02.698Z application/pdf http://hdl.handle.net/1956/21947 eng eng The University of Bergen Chapter 2: Marwaha, J., Jensen, K.H., Jakobsen, P.J. and Geist, J. (2017). Duration of the parasitic phase determines subsequent performance in juvenile freshwater pearl mussels (Margaritifera margaritifera). Ecology and Evolution, 7 (5), pp 1375-1383. The article is available at: http://hdl.handle.net/1956/17565 Chapter 3: Marwaha, J., Aase, H., Geist, J., Stoeckle, B.C., Kuehn, R. and Jakobsen, P.J. (2019). Host (Salmo trutta) age influences resistance to infestation by freshwater pearl mussel (Margaritifera margaritifera) glochidia. Parasitology Research, 118 (5), pp 1519-1532. The accepted version is available in the main thesis. The published version is available at: https://doi.org/10.1007/s00436-019-06300-2 Chapter 4: Marwaha, J., Jakobsen, P.J., Karlsson, S., and Wacker, S.W. (2019). Differential glochidial virulence and host bias of individual mothers observed in the freshwater pearl mussel (Margaritifera margaritifera) salmonid host-parasite system. The article is not available in BORA. container/27/c0/8b/76/27c08b76-a478-4be3-91a4-02ec8251bef6 http://hdl.handle.net/1956/21947 In copyright http://rightsstatements.org/page/InC/1.0/ Copyright the Author. All rights reserved Doctoral thesis 2020 ftunivbergen https://doi.org/10.1007/s00436-019-06300-2 2023-03-14T17:40:17Z The freshwater pearl mussel, Margaritifera margaritifera, is an endangered bivalve which has suffered a serious decline across its Holarctic distribution. It has a complex life cycle which involves an obligate parasitic stage on a suitable host. M. margaritifera populations are very host specific, and they are able to metamorphose only on the gills of Atlantic salmon (Salmo salar), sea trout (Salmo trutta f. trutta) or brown trout (S. trutta f. fario). Currently, the main concern is the lack of juvenile recruitment and survival in organically enriched river sediments. Consequently, several conservation programmes are rearing mussels in hatcheries, for eventual release back into their natural habitat when they are older and better able to survive. Although M. margaritifera do not reproduce on their hosts, their survival is highly dependent on the presence of suitable hosts. The main purpose of this study was to improve our understanding of the host-parasite interactions and their influence on glochidial or juvenile mussel fitness, with the aim of providing information that could be used to refine future conservation strategies. In the first experiment, the duration of the parasitic phase had a significant positive influence on post parasitic fitness of juvenile mussels in eight populations in Norway. Fitness was measured as size at excystment, post parasitic growth and survival. The strong positive relationship observed between the test variables clearly indicated that glochidial growth and development were dependent on individual host-parasite compatibility. In the same experiment, temperature was also observed to be an important factor governing excystment of juvenile mussels, with higher temperatures decreasing the duration of the parasitic phase. The variation in host suitability has been linked to environmental conditions, host age and/or size, genetic composition of the host and parasite, or a combination of these factors. Therefore, in the second experiment, the effect of host age on glochidial infestation ... Doctoral or Postdoctoral Thesis Atlantic salmon Salmo salar University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway Parasitology Research 118 5 1519 1532
institution Open Polar
collection University of Bergen: Bergen Open Research Archive (BORA-UiB)
op_collection_id ftunivbergen
language English
description The freshwater pearl mussel, Margaritifera margaritifera, is an endangered bivalve which has suffered a serious decline across its Holarctic distribution. It has a complex life cycle which involves an obligate parasitic stage on a suitable host. M. margaritifera populations are very host specific, and they are able to metamorphose only on the gills of Atlantic salmon (Salmo salar), sea trout (Salmo trutta f. trutta) or brown trout (S. trutta f. fario). Currently, the main concern is the lack of juvenile recruitment and survival in organically enriched river sediments. Consequently, several conservation programmes are rearing mussels in hatcheries, for eventual release back into their natural habitat when they are older and better able to survive. Although M. margaritifera do not reproduce on their hosts, their survival is highly dependent on the presence of suitable hosts. The main purpose of this study was to improve our understanding of the host-parasite interactions and their influence on glochidial or juvenile mussel fitness, with the aim of providing information that could be used to refine future conservation strategies. In the first experiment, the duration of the parasitic phase had a significant positive influence on post parasitic fitness of juvenile mussels in eight populations in Norway. Fitness was measured as size at excystment, post parasitic growth and survival. The strong positive relationship observed between the test variables clearly indicated that glochidial growth and development were dependent on individual host-parasite compatibility. In the same experiment, temperature was also observed to be an important factor governing excystment of juvenile mussels, with higher temperatures decreasing the duration of the parasitic phase. The variation in host suitability has been linked to environmental conditions, host age and/or size, genetic composition of the host and parasite, or a combination of these factors. Therefore, in the second experiment, the effect of host age on glochidial infestation ...
author2 orcid:0000-0002-8644-642X
format Doctoral or Postdoctoral Thesis
author Marwaha, Janhavi
spellingShingle Marwaha, Janhavi
Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts
author_facet Marwaha, Janhavi
author_sort Marwaha, Janhavi
title Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts
title_short Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts
title_full Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts
title_fullStr Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts
title_full_unstemmed Host-parasite interactions between freshwater pearl mussels (Margaritifera margaritifera) and their salmonid hosts
title_sort host-parasite interactions between freshwater pearl mussels (margaritifera margaritifera) and their salmonid hosts
publisher The University of Bergen
publishDate 2020
url http://hdl.handle.net/1956/21947
geographic Norway
geographic_facet Norway
genre Atlantic salmon
Salmo salar
genre_facet Atlantic salmon
Salmo salar
op_relation Chapter 2: Marwaha, J., Jensen, K.H., Jakobsen, P.J. and Geist, J. (2017). Duration of the parasitic phase determines subsequent performance in juvenile freshwater pearl mussels (Margaritifera margaritifera). Ecology and Evolution, 7 (5), pp 1375-1383. The article is available at: http://hdl.handle.net/1956/17565
Chapter 3: Marwaha, J., Aase, H., Geist, J., Stoeckle, B.C., Kuehn, R. and Jakobsen, P.J. (2019). Host (Salmo trutta) age influences resistance to infestation by freshwater pearl mussel (Margaritifera margaritifera) glochidia. Parasitology Research, 118 (5), pp 1519-1532. The accepted version is available in the main thesis. The published version is available at: https://doi.org/10.1007/s00436-019-06300-2
Chapter 4: Marwaha, J., Jakobsen, P.J., Karlsson, S., and Wacker, S.W. (2019). Differential glochidial virulence and host bias of individual mothers observed in the freshwater pearl mussel (Margaritifera margaritifera) salmonid host-parasite system. The article is not available in BORA.
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http://hdl.handle.net/1956/21947
op_rights In copyright
http://rightsstatements.org/page/InC/1.0/
Copyright the Author. All rights reserved
op_doi https://doi.org/10.1007/s00436-019-06300-2
container_title Parasitology Research
container_volume 118
container_issue 5
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