Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone

Migratory animals can act as cross-boundary subsidies sustaining ecosystem functioning, such as diadromous fishes that migrate between fresh water and seawater and carry nutrients and energy across the freshwater-marine ecotone. Frequency and timing of migration are however highly variable within an...

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Autores principales:	Saboret Grégoire, Buckle Duncan J., King Alison J., Douglas Michael M., Crook David A.
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	partial migration skipped spawning catadromy marine-derived nutrients prey availability Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/a6d607bb4d334966bfbc165346130071
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spelling	oai:doaj.org-article:a6d607bb4d334966bfbc1653461300712021-12-02T17:22:43ZPartial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone2084-883810.1515/ami-2020-0108https://doaj.org/article/a6d607bb4d334966bfbc1653461300712021-09-01T00:00:00Zhttps://doi.org/10.1515/ami-2020-0108https://doaj.org/toc/2084-8838Migratory animals can act as cross-boundary subsidies sustaining ecosystem functioning, such as diadromous fishes that migrate between fresh water and seawater and carry nutrients and energy across the freshwater-marine ecotone. Frequency and timing of migration are however highly variable within and among populations. We hypothesized that in catadromous fishes (i.e., diadromous fishes that grow in freshwater and spawn in the sea, such as eels), the import of subsidies by migratory juveniles could outweigh the export of subsidies by adults due to skipped spawning migration. We used the diamond mullet Planiliza ordensis, as a model species, and determined life-history traits using a combination of length-to-age data, acoustic telemetry and otolith (fish ear stone) microchemistry. We used a mass balance approach to model individual mass acquisition and allocation, and extended our model to other life-history strategies. Our results showed high intra-population variation of migratory behaviour in P. ordensis, with few individuals migrating every year to spawn. We estimated that an individual P. ordensis acted as a net 42.6g biomass subsidy in fresh water, representing a retention of more than 50% of the juvenile mass at freshwater entry. Our model predicts that skipped spawning is likely to alter the allocation of subsidies in diadromous species, highlighting the important effects of individual variation in migratory behaviour on fluxes of energy and nutrient at ecosystem scales. We encourage future studies to consider how variation in migratory behaviour is likely to affect the direction and magnitude of biomass fluxes across ecotone boundaries.Saboret GrégoireBuckle Duncan J.King Alison J.Douglas Michael M.Crook David A.De Gruyterarticlepartial migrationskipped spawningcatadromymarine-derived nutrientsprey availabilityBiology (General)QH301-705.5ENAnimal Migration, Vol 8, Iss 1, Pp 40-55 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	partial migration skipped spawning catadromy marine-derived nutrients prey availability Biology (General) QH301-705.5
spellingShingle	partial migration skipped spawning catadromy marine-derived nutrients prey availability Biology (General) QH301-705.5 Saboret Grégoire Buckle Duncan J. King Alison J. Douglas Michael M. Crook David A. Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone
description	Migratory animals can act as cross-boundary subsidies sustaining ecosystem functioning, such as diadromous fishes that migrate between fresh water and seawater and carry nutrients and energy across the freshwater-marine ecotone. Frequency and timing of migration are however highly variable within and among populations. We hypothesized that in catadromous fishes (i.e., diadromous fishes that grow in freshwater and spawn in the sea, such as eels), the import of subsidies by migratory juveniles could outweigh the export of subsidies by adults due to skipped spawning migration. We used the diamond mullet Planiliza ordensis, as a model species, and determined life-history traits using a combination of length-to-age data, acoustic telemetry and otolith (fish ear stone) microchemistry. We used a mass balance approach to model individual mass acquisition and allocation, and extended our model to other life-history strategies. Our results showed high intra-population variation of migratory behaviour in P. ordensis, with few individuals migrating every year to spawn. We estimated that an individual P. ordensis acted as a net 42.6g biomass subsidy in fresh water, representing a retention of more than 50% of the juvenile mass at freshwater entry. Our model predicts that skipped spawning is likely to alter the allocation of subsidies in diadromous species, highlighting the important effects of individual variation in migratory behaviour on fluxes of energy and nutrient at ecosystem scales. We encourage future studies to consider how variation in migratory behaviour is likely to affect the direction and magnitude of biomass fluxes across ecotone boundaries.
format	article
author	Saboret Grégoire Buckle Duncan J. King Alison J. Douglas Michael M. Crook David A.
author_facet	Saboret Grégoire Buckle Duncan J. King Alison J. Douglas Michael M. Crook David A.
author_sort	Saboret Grégoire
title	Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone
title_short	Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone
title_full	Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone
title_fullStr	Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone
title_full_unstemmed	Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone
title_sort	partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/a6d607bb4d334966bfbc165346130071
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Partial migration in diadromous fishes drives the allocation of subsidies across the freshwater-marine ecotone

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