Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods
Atlantic herring have a complex population structure and show a wide range of life history strategies, including spawning times and locations. Time of spawning is a key characteristic for population separation. Spawning timing fidelity is often assumed in herring, that is they spawn in the same seas...
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The University of Bergen
2019
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ftunivbergen:oai:bora.uib.no:11250/3042104 2023-05-15T17:41:42+02:00 Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods Østgaard, Hedda Dugstad 2019-06-13T22:00:14Z application/pdf https://hdl.handle.net/11250/3042104 eng eng The University of Bergen https://hdl.handle.net/11250/3042104 Copyright the Author. All rights reserved genetic markers phenotypic plasticity otolith microstructure Atlantic herring population structure maturity stages 751999 Master thesis 2019 ftunivbergen 2023-03-14T17:42:11Z Atlantic herring have a complex population structure and show a wide range of life history strategies, including spawning times and locations. Time of spawning is a key characteristic for population separation. Spawning timing fidelity is often assumed in herring, that is they spawn in the same season as they hatched. However, low rates of spawning season switching (straying), is observed in a number of stocks suggesting interbreeding between populations. Spring and autumn are the most common spawning seasons among Northeast Atlantic herring populations. Seasonally spawning herring are traditionally separated on their gonadal maturity stage at sampling, but otolith microstructure has also been used to separate herring form mixed catches. Genetic discreteness was recently documented for spring and autumn spawning herring. The present thesis investigates population structure and dynamics between spring and autumn spawning herring. Phenotypic maturity status was related to two genomic SNPs markers. In addition, hatching season was determined through visual reading of otolith microstructures, corroborating the already known spawning season pattern. Herring were sampled during spring and autumn at the same locations in western Norway from autumn 2016-2018. Spawning herring (ripe and running) were found in both sampling seasons but spring spawning herring dominated in all samples. Herring were successfully separated to spawning type spring or autumn by the three separation methods. Correspondence was generally high, but some spawning season switching was also observed. In autumn samples, straying was documented among the autumn spawning herring (45.0%), while the spring sampled spring spawning herring showed high fidelity (95.2%). These results suggest an increased effect of straying on the less abundant autumn spawning herring. When comparing separation methods two by two the correspondence was highest between hatching season and genetic spawning season. It is suggested that adaption to spawn in spring or autumn ... Master Thesis Northeast Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
genetic markers phenotypic plasticity otolith microstructure Atlantic herring population structure maturity stages 751999 |
spellingShingle |
genetic markers phenotypic plasticity otolith microstructure Atlantic herring population structure maturity stages 751999 Østgaard, Hedda Dugstad Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods |
topic_facet |
genetic markers phenotypic plasticity otolith microstructure Atlantic herring population structure maturity stages 751999 |
description |
Atlantic herring have a complex population structure and show a wide range of life history strategies, including spawning times and locations. Time of spawning is a key characteristic for population separation. Spawning timing fidelity is often assumed in herring, that is they spawn in the same season as they hatched. However, low rates of spawning season switching (straying), is observed in a number of stocks suggesting interbreeding between populations. Spring and autumn are the most common spawning seasons among Northeast Atlantic herring populations. Seasonally spawning herring are traditionally separated on their gonadal maturity stage at sampling, but otolith microstructure has also been used to separate herring form mixed catches. Genetic discreteness was recently documented for spring and autumn spawning herring. The present thesis investigates population structure and dynamics between spring and autumn spawning herring. Phenotypic maturity status was related to two genomic SNPs markers. In addition, hatching season was determined through visual reading of otolith microstructures, corroborating the already known spawning season pattern. Herring were sampled during spring and autumn at the same locations in western Norway from autumn 2016-2018. Spawning herring (ripe and running) were found in both sampling seasons but spring spawning herring dominated in all samples. Herring were successfully separated to spawning type spring or autumn by the three separation methods. Correspondence was generally high, but some spawning season switching was also observed. In autumn samples, straying was documented among the autumn spawning herring (45.0%), while the spring sampled spring spawning herring showed high fidelity (95.2%). These results suggest an increased effect of straying on the less abundant autumn spawning herring. When comparing separation methods two by two the correspondence was highest between hatching season and genetic spawning season. It is suggested that adaption to spawn in spring or autumn ... |
format |
Master Thesis |
author |
Østgaard, Hedda Dugstad |
author_facet |
Østgaard, Hedda Dugstad |
author_sort |
Østgaard, Hedda Dugstad |
title |
Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods |
title_short |
Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods |
title_full |
Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods |
title_fullStr |
Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods |
title_full_unstemmed |
Spawning season fidelity in spring and autumn spawning Atlantic herring, Clupea harengus. - A comparative study of genomic and phenotypic separation methods |
title_sort |
spawning season fidelity in spring and autumn spawning atlantic herring, clupea harengus. - a comparative study of genomic and phenotypic separation methods |
publisher |
The University of Bergen |
publishDate |
2019 |
url |
https://hdl.handle.net/11250/3042104 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
https://hdl.handle.net/11250/3042104 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766143396519346176 |