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Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants

Francisco Marco-Rius, Pablo Caballero, Paloma Morán, Carlos Garcia De Leaniz Orcid Logo

PLOS ONE, Volume: 8, Issue: 4

Swansea University Author: Carlos Garcia De Leaniz Orcid Logo

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DOI (Published version): 10.1371/journal.pone.0061744

Abstract

Fish growth is commonly used as a proxy for fitness but this is only valid if individual growth variation can be interpreted inrelation to conspecifics’ performance. Unfortunately, assessing individual variation in growth rates is problematic undernatural conditions because subjects typically need t...

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Published in: PLOS ONE
Published: 2013
URI: https://cronfa.swan.ac.uk/Record/cronfa14678
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first_indexed 2013-07-23T12:12:41Z
last_indexed 2018-02-09T04:46:12Z
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spelling 2016-09-07T14:39:05.8306884 v2 14678 2013-04-23 Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants 1c70acd0fd64edb0856b7cf34393ab02 0000-0003-1650-2729 Carlos Garcia De Leaniz Carlos Garcia De Leaniz true false 2013-04-23 SBI Fish growth is commonly used as a proxy for fitness but this is only valid if individual growth variation can be interpreted inrelation to conspecifics’ performance. Unfortunately, assessing individual variation in growth rates is problematic undernatural conditions because subjects typically need to be marked, repeated measurements of body size are difficult to obtainin the field, and recaptures may be limited to a few time events which will generally vary among individuals. The analysis ofconsecutive growth rings (circuli) found on scales and other hard structures offers an alternative to mark and recapture forexamining individual growth variation in fish and other aquatic vertebrates where growth rings can be visualized, butaccounting for autocorrelations and seasonal growth stanzas has proved challenging. Here we show how mixed-effectsmodelling of scale growth increments (inter-circuli spacing) can be used to reconstruct the growth trajectories of sea trout(Salmo trutta) and correctly classify 89% of individuals into early or late seaward migrants (smolts). Early migrants grewfaster than late migrants during their first year of life in freshwater in two natural populations, suggesting that migrationinto the sea was triggered by ontogenetic (intrinsic) drivers, rather than by competition with conspecifics. Our studyhighlights the profound effects that early growth can have on age at migration of a paradigmatic fish migrant and illustrateshow the analysis of inter-circuli spacing can be used to reconstruct the detailed growth of individuals when these cannot bemarked or are only caught once. Journal Article PLOS ONE 8 4 31 12 2013 2013-12-31 10.1371/journal.pone.0061744 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2016-09-07T14:39:05.8306884 2013-04-23T15:52:40.4046005 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Francisco Marco-Rius 1 Pablo Caballero 2 Paloma Morán 3 Carlos Garcia De Leaniz 0000-0003-1650-2729 4
title Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants
spellingShingle Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants
Carlos Garcia De Leaniz
title_short Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants
title_full Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants
title_fullStr Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants
title_full_unstemmed Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants
title_sort Mixed-effects modelling of scale growth profiles predicts the occurrence of early and late fish migrants
author_id_str_mv 1c70acd0fd64edb0856b7cf34393ab02
author_id_fullname_str_mv 1c70acd0fd64edb0856b7cf34393ab02_***_Carlos Garcia De Leaniz
author Carlos Garcia De Leaniz
author2 Francisco Marco-Rius
Pablo Caballero
Paloma Morán
Carlos Garcia De Leaniz
format Journal article
container_title PLOS ONE
container_volume 8
container_issue 4
publishDate 2013
institution Swansea University
doi_str_mv 10.1371/journal.pone.0061744
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 0
active_str 0
description Fish growth is commonly used as a proxy for fitness but this is only valid if individual growth variation can be interpreted inrelation to conspecifics’ performance. Unfortunately, assessing individual variation in growth rates is problematic undernatural conditions because subjects typically need to be marked, repeated measurements of body size are difficult to obtainin the field, and recaptures may be limited to a few time events which will generally vary among individuals. The analysis ofconsecutive growth rings (circuli) found on scales and other hard structures offers an alternative to mark and recapture forexamining individual growth variation in fish and other aquatic vertebrates where growth rings can be visualized, butaccounting for autocorrelations and seasonal growth stanzas has proved challenging. Here we show how mixed-effectsmodelling of scale growth increments (inter-circuli spacing) can be used to reconstruct the growth trajectories of sea trout(Salmo trutta) and correctly classify 89% of individuals into early or late seaward migrants (smolts). Early migrants grewfaster than late migrants during their first year of life in freshwater in two natural populations, suggesting that migrationinto the sea was triggered by ontogenetic (intrinsic) drivers, rather than by competition with conspecifics. Our studyhighlights the profound effects that early growth can have on age at migration of a paradigmatic fish migrant and illustrateshow the analysis of inter-circuli spacing can be used to reconstruct the detailed growth of individuals when these cannot bemarked or are only caught once.
published_date 2013-12-31T03:16:48Z
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score 11.013731

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