Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon
Environmental conditions vary spatially and temporally, providing organisms with both challenges and opportunities. Animals have evolved a spectacular variety of migratory behaviours to take advantage of environmental variation, particularly in cases where this variation is predictable. The spatiote...
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University College Cork
2020
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ftunivcollcork:oai:cora.ucc.ie:10468/10543 2023-08-27T04:08:31+02:00 Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon Finlay, Ross Reed, Thomas Poole, Russell 2020-05 application/pdf http://hdl.handle.net/10468/10543 en eng University College Cork Marine Institute (Cullen Fellowship award CF/15/06) Finlay, R. 2020. Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon . PhD Thesis, University College Cork. 292 http://hdl.handle.net/10468/10543 © 2020, Ross Finlay. https://creativecommons.org/licenses/by-nc-nd/4.0/ Population genetics Salmonid Migration Behaviour Telemetry Parasites Dispersal Phenology Salmo trutta Salmo salar Osmoregulation Gene flow Doctoral thesis Doctoral PhD - Doctor of Philosophy 2020 ftunivcollcork 2023-08-06T14:30:59Z Environmental conditions vary spatially and temporally, providing organisms with both challenges and opportunities. Animals have evolved a spectacular variety of migratory behaviours to take advantage of environmental variation, particularly in cases where this variation is predictable. The spatiotemporal pattern of migratory movements displayed by a population or species can be thought of as the evolutionary outcome of trade-offs amongst life history traits. As such, the study of animal movement in relation to environmental heterogeneity can yield valuable insights into the proximate and ultimate drivers of migratory behaviours as well as the behavioural mechanisms underpinning genetic structure. Against this background, the overarching aim of this thesis is to investigate the role of environmental heterogeneity in shaping locally-adapted migratory behaviours, finescale genetic structure and physiological performance in populations of wild brown trout (Salmo trutta) and Atlantic salmon (Salmo salar). Using telemetry data from passive integrated transponder (PIT) tags, I investigated the fine scale spatiotemporal patterns of spawning-related movements of brown trout between a feeding lake and two spawning streams (one inflowing, one outflowing, separated by < 100 m) over two spawning seasons. The timing of seasonal, daily and diel movements was strongly associated with variation in photoperiod, stream height and moon phase. Movement activity was highest at night, and particularly on nights with minimal lunar illumination and high water levels, suggesting that trout synchronise their spawning movements with environmental conditions that minimise their visibility to predators. Males began their movements between the lake and vii streams significantly earlier in the spawning season than females (protandry) and were generally more active. A substantial proportion of trout entered both spawning streams during the spawning periods, providing potential sources of gene flow between the two streams. However, Bayesian ... Doctoral or Postdoctoral Thesis Atlantic salmon Salmo salar University College Cork, Ireland: Cork Open Research Archive (CORA) |
institution |
Open Polar |
collection |
University College Cork, Ireland: Cork Open Research Archive (CORA) |
op_collection_id |
ftunivcollcork |
language |
English |
topic |
Population genetics Salmonid Migration Behaviour Telemetry Parasites Dispersal Phenology Salmo trutta Salmo salar Osmoregulation Gene flow |
spellingShingle |
Population genetics Salmonid Migration Behaviour Telemetry Parasites Dispersal Phenology Salmo trutta Salmo salar Osmoregulation Gene flow Finlay, Ross Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon |
topic_facet |
Population genetics Salmonid Migration Behaviour Telemetry Parasites Dispersal Phenology Salmo trutta Salmo salar Osmoregulation Gene flow |
description |
Environmental conditions vary spatially and temporally, providing organisms with both challenges and opportunities. Animals have evolved a spectacular variety of migratory behaviours to take advantage of environmental variation, particularly in cases where this variation is predictable. The spatiotemporal pattern of migratory movements displayed by a population or species can be thought of as the evolutionary outcome of trade-offs amongst life history traits. As such, the study of animal movement in relation to environmental heterogeneity can yield valuable insights into the proximate and ultimate drivers of migratory behaviours as well as the behavioural mechanisms underpinning genetic structure. Against this background, the overarching aim of this thesis is to investigate the role of environmental heterogeneity in shaping locally-adapted migratory behaviours, finescale genetic structure and physiological performance in populations of wild brown trout (Salmo trutta) and Atlantic salmon (Salmo salar). Using telemetry data from passive integrated transponder (PIT) tags, I investigated the fine scale spatiotemporal patterns of spawning-related movements of brown trout between a feeding lake and two spawning streams (one inflowing, one outflowing, separated by < 100 m) over two spawning seasons. The timing of seasonal, daily and diel movements was strongly associated with variation in photoperiod, stream height and moon phase. Movement activity was highest at night, and particularly on nights with minimal lunar illumination and high water levels, suggesting that trout synchronise their spawning movements with environmental conditions that minimise their visibility to predators. Males began their movements between the lake and vii streams significantly earlier in the spawning season than females (protandry) and were generally more active. A substantial proportion of trout entered both spawning streams during the spawning periods, providing potential sources of gene flow between the two streams. However, Bayesian ... |
author2 |
Reed, Thomas Poole, Russell |
format |
Doctoral or Postdoctoral Thesis |
author |
Finlay, Ross |
author_facet |
Finlay, Ross |
author_sort |
Finlay, Ross |
title |
Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon |
title_short |
Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon |
title_full |
Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon |
title_fullStr |
Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon |
title_full_unstemmed |
Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon |
title_sort |
environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and atlantic salmon |
publisher |
University College Cork |
publishDate |
2020 |
url |
http://hdl.handle.net/10468/10543 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
Marine Institute (Cullen Fellowship award CF/15/06) Finlay, R. 2020. Environmental drivers of spatiotemporal variation in the movement, performance, and genetic structure of brown trout and Atlantic salmon . PhD Thesis, University College Cork. 292 http://hdl.handle.net/10468/10543 |
op_rights |
© 2020, Ross Finlay. https://creativecommons.org/licenses/by-nc-nd/4.0/ |
_version_ |
1775349332160020480 |