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Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments
We used hyperspectral imaging to study short-term effects of bioturbation by lugworms (Arenicola marina) on the surficial biomass of microphytobenthos (MPB) in permeable marine sediments. Within days to weeks after the addition of a lugworm to a homogenized and recomposed sediment, the average surfi...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4521690/ https://www.ncbi.nlm.nih.gov/pubmed/26230398 http://dx.doi.org/10.1371/journal.pone.0134236 |
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author | Chennu, Arjun Volkenborn, Nils de Beer, Dirk Wethey, David S. Woodin, Sarah A. Polerecky, Lubos |
author_facet | Chennu, Arjun Volkenborn, Nils de Beer, Dirk Wethey, David S. Woodin, Sarah A. Polerecky, Lubos |
author_sort | Chennu, Arjun |
collection | PubMed |
description | We used hyperspectral imaging to study short-term effects of bioturbation by lugworms (Arenicola marina) on the surficial biomass of microphytobenthos (MPB) in permeable marine sediments. Within days to weeks after the addition of a lugworm to a homogenized and recomposed sediment, the average surficial MPB biomass and its spatial heterogeneity were, respectively, 150-250% and 280% higher than in sediments without lugworms. The surficial sediment area impacted by a single medium-sized lugworm (~4 g wet weight) over this time-scale was at least 340 cm(2). While sediment reworking was the primary cause of the increased spatial heterogeneity, experiments with lugworm-mimics together with modeling showed that bioadvective porewater transport from depth to the sediment surface, as induced by the lugworm ventilating its burrow, was the main cause of the increased surficial MPB biomass. Although direct measurements of nutrient fluxes are lacking, our present data show that enhanced advective supply of nutrients from deeper sediment layers induced by faunal ventilation is an important mechanism that fuels high primary productivity at the surface of permeable sediments even though these systems are generally characterized by low standing stocks of nutrients and organic material. |
format | Online Article Text |
id | pubmed-4521690 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-45216902015-08-06 Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments Chennu, Arjun Volkenborn, Nils de Beer, Dirk Wethey, David S. Woodin, Sarah A. Polerecky, Lubos PLoS One Research Article We used hyperspectral imaging to study short-term effects of bioturbation by lugworms (Arenicola marina) on the surficial biomass of microphytobenthos (MPB) in permeable marine sediments. Within days to weeks after the addition of a lugworm to a homogenized and recomposed sediment, the average surficial MPB biomass and its spatial heterogeneity were, respectively, 150-250% and 280% higher than in sediments without lugworms. The surficial sediment area impacted by a single medium-sized lugworm (~4 g wet weight) over this time-scale was at least 340 cm(2). While sediment reworking was the primary cause of the increased spatial heterogeneity, experiments with lugworm-mimics together with modeling showed that bioadvective porewater transport from depth to the sediment surface, as induced by the lugworm ventilating its burrow, was the main cause of the increased surficial MPB biomass. Although direct measurements of nutrient fluxes are lacking, our present data show that enhanced advective supply of nutrients from deeper sediment layers induced by faunal ventilation is an important mechanism that fuels high primary productivity at the surface of permeable sediments even though these systems are generally characterized by low standing stocks of nutrients and organic material. Public Library of Science 2015-07-31 /pmc/articles/PMC4521690/ /pubmed/26230398 http://dx.doi.org/10.1371/journal.pone.0134236 Text en © 2015 Chennu et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Chennu, Arjun Volkenborn, Nils de Beer, Dirk Wethey, David S. Woodin, Sarah A. Polerecky, Lubos Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments |
title | Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments |
title_full | Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments |
title_fullStr | Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments |
title_full_unstemmed | Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments |
title_short | Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments |
title_sort | effects of bioadvection by arenicola marina on microphytobenthos in permeable sediments |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4521690/ https://www.ncbi.nlm.nih.gov/pubmed/26230398 http://dx.doi.org/10.1371/journal.pone.0134236 |
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