Migratory-derived resources induce elongated food chains through middle-up food web effects
Abstract Background Seasonal movements of animals often result in the transfer of large amounts of energy and nutrients across ecosystem boundaries, which may have large consequences on local food webs through various pathways. While this is known for both terrestrial- and aquatic organisms, quantit...
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ftdoajarticles:oai:doaj.org/article:f8d5667d5e1649f792786ac00af65770 2024-09-15T17:52:23+00:00 Migratory-derived resources induce elongated food chains through middle-up food web effects Coralie Moccetti Nicola Sperlich Grégoire Saboret Hanna ten Brink Jakob Brodersen 2024-08-01T00:00:00Z https://doi.org/10.1186/s40462-024-00496-4 https://doaj.org/article/f8d5667d5e1649f792786ac00af65770 EN eng BMC https://doi.org/10.1186/s40462-024-00496-4 https://doaj.org/toc/2051-3933 doi:10.1186/s40462-024-00496-4 2051-3933 https://doaj.org/article/f8d5667d5e1649f792786ac00af65770 Movement Ecology, Vol 12, Iss 1, Pp 1-15 (2024) Arctic charr Cannibalism Food chain length Growth rate Marine-derived resources Partial migration Biology (General) QH301-705.5 article 2024 ftdoajarticles https://doi.org/10.1186/s40462-024-00496-4 2024-08-26T15:21:14Z Abstract Background Seasonal movements of animals often result in the transfer of large amounts of energy and nutrients across ecosystem boundaries, which may have large consequences on local food webs through various pathways. While this is known for both terrestrial- and aquatic organisms, quantitative estimates on its effects on food web structure and identification of key pathways are scarce, due to the difficulty in obtaining replication on ecosystem level with negative control, i.e. comparable systems without migration. Methods In this study, we estimate the impact of Arctic charr (Salvelinus alpinus) migration on riverine ecosystem structure, by comparing multiple streams with strictly resident populations above natural migration barriers with streams below those barriers harboring partially migratory populations. We compared density estimates and size structure between above and below populations. Diet differences were examined through the analysis of stomach contents, changes in trophic position were examined by using stable isotopes. To infer growth rate of resident individuals, back-growth calculation was performed using otoliths. Results We find higher densities of small juveniles in partially migratory populations, where juvenile Arctic charr show initially lower growth, likely due to higher intraspecific competition. After reaching a size, where they can start feeding on eggs and smaller juveniles, which are both more frequent in partially migratory populations, growth surpasses that of resident populations. Cannibalism induced by high juvenile densities occurred almost exclusively in populations with migration and represents an altered energy pathway to the food web. The presence of large cannibalistic charr feeding on smaller ones that have a similar trophic level as charr from strictly resident populations (based on stomach content) coupled with steeper δ15N-size regression slopes illustrate the general increase of food chain length in systems with migration. Conclusions Our results thus suggest ... Article in Journal/Newspaper Arctic charr Salvelinus alpinus Directory of Open Access Journals: DOAJ Articles Movement Ecology 12 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic charr Cannibalism Food chain length Growth rate Marine-derived resources Partial migration Biology (General) QH301-705.5 |
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Arctic charr Cannibalism Food chain length Growth rate Marine-derived resources Partial migration Biology (General) QH301-705.5 Coralie Moccetti Nicola Sperlich Grégoire Saboret Hanna ten Brink Jakob Brodersen Migratory-derived resources induce elongated food chains through middle-up food web effects |
topic_facet |
Arctic charr Cannibalism Food chain length Growth rate Marine-derived resources Partial migration Biology (General) QH301-705.5 |
description |
Abstract Background Seasonal movements of animals often result in the transfer of large amounts of energy and nutrients across ecosystem boundaries, which may have large consequences on local food webs through various pathways. While this is known for both terrestrial- and aquatic organisms, quantitative estimates on its effects on food web structure and identification of key pathways are scarce, due to the difficulty in obtaining replication on ecosystem level with negative control, i.e. comparable systems without migration. Methods In this study, we estimate the impact of Arctic charr (Salvelinus alpinus) migration on riverine ecosystem structure, by comparing multiple streams with strictly resident populations above natural migration barriers with streams below those barriers harboring partially migratory populations. We compared density estimates and size structure between above and below populations. Diet differences were examined through the analysis of stomach contents, changes in trophic position were examined by using stable isotopes. To infer growth rate of resident individuals, back-growth calculation was performed using otoliths. Results We find higher densities of small juveniles in partially migratory populations, where juvenile Arctic charr show initially lower growth, likely due to higher intraspecific competition. After reaching a size, where they can start feeding on eggs and smaller juveniles, which are both more frequent in partially migratory populations, growth surpasses that of resident populations. Cannibalism induced by high juvenile densities occurred almost exclusively in populations with migration and represents an altered energy pathway to the food web. The presence of large cannibalistic charr feeding on smaller ones that have a similar trophic level as charr from strictly resident populations (based on stomach content) coupled with steeper δ15N-size regression slopes illustrate the general increase of food chain length in systems with migration. Conclusions Our results thus suggest ... |
format |
Article in Journal/Newspaper |
author |
Coralie Moccetti Nicola Sperlich Grégoire Saboret Hanna ten Brink Jakob Brodersen |
author_facet |
Coralie Moccetti Nicola Sperlich Grégoire Saboret Hanna ten Brink Jakob Brodersen |
author_sort |
Coralie Moccetti |
title |
Migratory-derived resources induce elongated food chains through middle-up food web effects |
title_short |
Migratory-derived resources induce elongated food chains through middle-up food web effects |
title_full |
Migratory-derived resources induce elongated food chains through middle-up food web effects |
title_fullStr |
Migratory-derived resources induce elongated food chains through middle-up food web effects |
title_full_unstemmed |
Migratory-derived resources induce elongated food chains through middle-up food web effects |
title_sort |
migratory-derived resources induce elongated food chains through middle-up food web effects |
publisher |
BMC |
publishDate |
2024 |
url |
https://doi.org/10.1186/s40462-024-00496-4 https://doaj.org/article/f8d5667d5e1649f792786ac00af65770 |
genre |
Arctic charr Salvelinus alpinus |
genre_facet |
Arctic charr Salvelinus alpinus |
op_source |
Movement Ecology, Vol 12, Iss 1, Pp 1-15 (2024) |
op_relation |
https://doi.org/10.1186/s40462-024-00496-4 https://doaj.org/toc/2051-3933 doi:10.1186/s40462-024-00496-4 2051-3933 https://doaj.org/article/f8d5667d5e1649f792786ac00af65770 |
op_doi |
https://doi.org/10.1186/s40462-024-00496-4 |
container_title |
Movement Ecology |
container_volume |
12 |
container_issue |
1 |
_version_ |
1810294420255277056 |