Individual variation in Atlantic salmon fertilization success: Implications for effective population size
Mating structure can influence the variance in individual reproductive success, which in turn has important implications for a population's effective size. Atlantic salmon (Salmo salar) males are characterized by alternative reproductive strategies, maturing as small parr in fresh water and/or...
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ftdalhouse:oai:DalSpace.library.dal.ca:10222/28995 2023-05-15T15:31:54+02:00 Individual variation in Atlantic salmon fertilization success: Implications for effective population size Jones, MW Hutchings, Jeffrey Alexander 2013-07-04T18:43:08Z https://doi.org/10.2307/3061145 http://hdl.handle.net/10222/28995 unknown Ecological Applications 1051-0761 http://dx.doi.org/10.2307/3061145 http://hdl.handle.net/10222/28995 12 1 184 article 2013 ftdalhouse https://doi.org/10.2307/3061145 2021-12-29T18:08:48Z Mating structure can influence the variance in individual reproductive success, which in turn has important implications for a population's effective size. Atlantic salmon (Salmo salar) males are characterized by alternative reproductive strategies, maturing as small parr in fresh water and/or as considerably larger anadromous males following a migration to sea. The potential for significant variation in individual reproductive success L in both sexes is high. We established two experimental crosses each involving four anadromous females, four anadromous males, and 20 mature male parr in a seminatural spawning environment. We used hyper-variable microsatellite loci to identify the parents of 755 embryos and to quantify the variance in individual fertilization success. Anadromous males generally dominated fertilization success, with a mean individual fertilization success of 15.7% and 19.3% in replicates A and B, respectively, as compared with 1.9% and 1.2% for the mature male part. There was no relationship between individual mature male parr size and individual fertilization success in any individual nest, nor was there any relationship between anadromous male size and individual fertilization success in either replicate. There was some evidence of size being an important determinant of both the frequency of spawning and the overall individual parr fertilization success among those parr identified as having spawned, although these relationships were not always significant. Both anadromous males and females were identified as having spawned with multiple partners, although the frequency of multiple anadromous males spawning simultaneously with a female was low. Fertilization of eggs by parr can significantly increase the effective number of males on a nest-by-nest basis; however, the variance in individual anadromous male fertilization success appears to have the greatest overall influence on effective population size. Article in Journal/Newspaper Atlantic salmon Salmo salar Dalhousie University: DalSpace Institutional Repository Ecological Applications 12 1 184 |
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Mating structure can influence the variance in individual reproductive success, which in turn has important implications for a population's effective size. Atlantic salmon (Salmo salar) males are characterized by alternative reproductive strategies, maturing as small parr in fresh water and/or as considerably larger anadromous males following a migration to sea. The potential for significant variation in individual reproductive success L in both sexes is high. We established two experimental crosses each involving four anadromous females, four anadromous males, and 20 mature male parr in a seminatural spawning environment. We used hyper-variable microsatellite loci to identify the parents of 755 embryos and to quantify the variance in individual fertilization success. Anadromous males generally dominated fertilization success, with a mean individual fertilization success of 15.7% and 19.3% in replicates A and B, respectively, as compared with 1.9% and 1.2% for the mature male part. There was no relationship between individual mature male parr size and individual fertilization success in any individual nest, nor was there any relationship between anadromous male size and individual fertilization success in either replicate. There was some evidence of size being an important determinant of both the frequency of spawning and the overall individual parr fertilization success among those parr identified as having spawned, although these relationships were not always significant. Both anadromous males and females were identified as having spawned with multiple partners, although the frequency of multiple anadromous males spawning simultaneously with a female was low. Fertilization of eggs by parr can significantly increase the effective number of males on a nest-by-nest basis; however, the variance in individual anadromous male fertilization success appears to have the greatest overall influence on effective population size. |
format |
Article in Journal/Newspaper |
author |
Jones, MW Hutchings, Jeffrey Alexander |
spellingShingle |
Jones, MW Hutchings, Jeffrey Alexander Individual variation in Atlantic salmon fertilization success: Implications for effective population size |
author_facet |
Jones, MW Hutchings, Jeffrey Alexander |
author_sort |
Jones, MW |
title |
Individual variation in Atlantic salmon fertilization success: Implications for effective population size |
title_short |
Individual variation in Atlantic salmon fertilization success: Implications for effective population size |
title_full |
Individual variation in Atlantic salmon fertilization success: Implications for effective population size |
title_fullStr |
Individual variation in Atlantic salmon fertilization success: Implications for effective population size |
title_full_unstemmed |
Individual variation in Atlantic salmon fertilization success: Implications for effective population size |
title_sort |
individual variation in atlantic salmon fertilization success: implications for effective population size |
publishDate |
2013 |
url |
https://doi.org/10.2307/3061145 http://hdl.handle.net/10222/28995 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
Ecological Applications 1051-0761 http://dx.doi.org/10.2307/3061145 http://hdl.handle.net/10222/28995 12 1 184 |
op_doi |
https://doi.org/10.2307/3061145 |
container_title |
Ecological Applications |
container_volume |
12 |
container_issue |
1 |
container_start_page |
184 |
_version_ |
1766362407934885888 |