In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection.
Habitat fragmentation and reduction in the availability of suitable habitats are significant threats to ecosystems in particularly for freshwater ones. For instance, accessibility, availability, and quality of breeding sites of Atlantic salmon, \textit{Salmo salar}, can be restricting in some rivers...
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fttriple:oai:gotriple.eu:10670/1.0llfik 2023-05-15T15:31:26+02:00 In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. L’utilisation de l’espace par les potentiels reproducteurs stabilise la dynamique de la population et façonne la sélection sexuelle chez le saumon Atlantique. Bouchard, Colin Pau Tentelier, Cédric Bardonnet, Agnès 2018-12-14 http://www.theses.fr/2018PAUU3024/document en eng 10670/1.0llfik http://www.theses.fr/2018PAUU3024/document other Theses.fr Agrégation spatiale Compétition sexuelle Compétition sociale Fragmentation de l'habitat Habitat de reproduction Saumon Atlantique Système d'appariement Réseau sexuel Stock-Recrutement Atlantic salmon Breeding sites Habitat fragmentation Mature parr Mating system Sexual network Sexual competition Social competition Spatial aggregation Stock-Recruitment envir geo Thesis https://vocabularies.coar-repositories.org/resource_types/c_46ec/ 2018 fttriple 2023-01-22T18:35:00Z Habitat fragmentation and reduction in the availability of suitable habitats are significant threats to ecosystems in particularly for freshwater ones. For instance, accessibility, availability, and quality of breeding sites of Atlantic salmon, \textit{Salmo salar}, can be restricting in some rivers due to human activities and dams. Such threats may affect distribution of potential breeders because after their up-river migration, salmon females distribute within available breeding sites. Spatial distribution of females determines the spatial distribution of breeder males. Dominant males try to monopolise several females, whereas subordinate males adopt a sneaky behaviour. Access to females by males depends on the spatial distribution of females and on males' displacements within a river. The spatial distribution of females generates the spatial distribution of juveniles, aggregating them at some breeding sites. The latter aggregation of juveniles may raise the density-dependent mortality with potential consequences on population dynamics. The thesis aims to assess how space use of potential breeders, namely mature individuals able to spawn or fertilise eggs, influence population dynamics and sexual selection.I combined different approaches and different temporal and spatial scales to potential effects of space use of potential breeders. Time series of stock (deposited eggs) and of recruitment (juveniles) for the salmon population of the Nivelle River were combined with measures of spatial aggregation of nests. The effects of displacements and spatial distribution of potential breeders on their participation in reproduction were tested through inferring the sexual network of the population.I found that spatial aggregation of nests improved the recruitment variability but did not affect the average recruitment. The spatial aggregation of nests resulting from female aggregation was also linked to the number of effective breeders through a U-shaped curve. Such relationships suggested mate monopolization dependent on ... Thesis Atlantic salmon Salmo salar Unknown |
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Open Polar |
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op_collection_id |
fttriple |
language |
English |
topic |
Agrégation spatiale Compétition sexuelle Compétition sociale Fragmentation de l'habitat Habitat de reproduction Saumon Atlantique Système d'appariement Réseau sexuel Stock-Recrutement Atlantic salmon Breeding sites Habitat fragmentation Mature parr Mating system Sexual network Sexual competition Social competition Spatial aggregation Stock-Recruitment envir geo |
spellingShingle |
Agrégation spatiale Compétition sexuelle Compétition sociale Fragmentation de l'habitat Habitat de reproduction Saumon Atlantique Système d'appariement Réseau sexuel Stock-Recrutement Atlantic salmon Breeding sites Habitat fragmentation Mature parr Mating system Sexual network Sexual competition Social competition Spatial aggregation Stock-Recruitment envir geo Bouchard, Colin In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. |
topic_facet |
Agrégation spatiale Compétition sexuelle Compétition sociale Fragmentation de l'habitat Habitat de reproduction Saumon Atlantique Système d'appariement Réseau sexuel Stock-Recrutement Atlantic salmon Breeding sites Habitat fragmentation Mature parr Mating system Sexual network Sexual competition Social competition Spatial aggregation Stock-Recruitment envir geo |
description |
Habitat fragmentation and reduction in the availability of suitable habitats are significant threats to ecosystems in particularly for freshwater ones. For instance, accessibility, availability, and quality of breeding sites of Atlantic salmon, \textit{Salmo salar}, can be restricting in some rivers due to human activities and dams. Such threats may affect distribution of potential breeders because after their up-river migration, salmon females distribute within available breeding sites. Spatial distribution of females determines the spatial distribution of breeder males. Dominant males try to monopolise several females, whereas subordinate males adopt a sneaky behaviour. Access to females by males depends on the spatial distribution of females and on males' displacements within a river. The spatial distribution of females generates the spatial distribution of juveniles, aggregating them at some breeding sites. The latter aggregation of juveniles may raise the density-dependent mortality with potential consequences on population dynamics. The thesis aims to assess how space use of potential breeders, namely mature individuals able to spawn or fertilise eggs, influence population dynamics and sexual selection.I combined different approaches and different temporal and spatial scales to potential effects of space use of potential breeders. Time series of stock (deposited eggs) and of recruitment (juveniles) for the salmon population of the Nivelle River were combined with measures of spatial aggregation of nests. The effects of displacements and spatial distribution of potential breeders on their participation in reproduction were tested through inferring the sexual network of the population.I found that spatial aggregation of nests improved the recruitment variability but did not affect the average recruitment. The spatial aggregation of nests resulting from female aggregation was also linked to the number of effective breeders through a U-shaped curve. Such relationships suggested mate monopolization dependent on ... |
author2 |
Pau Tentelier, Cédric Bardonnet, Agnès |
format |
Thesis |
author |
Bouchard, Colin |
author_facet |
Bouchard, Colin |
author_sort |
Bouchard, Colin |
title |
In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. |
title_short |
In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. |
title_full |
In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. |
title_fullStr |
In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. |
title_full_unstemmed |
In Atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. |
title_sort |
in atlantic salmon, space use of potential breeders stabilises population dynamics and shapes sexual selection. |
publishDate |
2018 |
url |
http://www.theses.fr/2018PAUU3024/document |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Theses.fr |
op_relation |
10670/1.0llfik http://www.theses.fr/2018PAUU3024/document |
op_rights |
other |
_version_ |
1766361948312567808 |