Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient
Freshwater bacterioplankton communities are influenced by the transport of bacteria from the surrounding terrestrial environments. It has been shown that, although most of these dispersed bacteria gradually disappear along the hydrologic continuum, some can thrive in aquatic systems and become domi...
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doaj-834527b9d07044dcbd1cd7d6f437512b2020-11-25T00:28:53ZengPAGEPress PublicationsAdvances in Oceanography and Limnology1947-57211947-573X2017-12-018210.4081/aiol.2017.7232Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradientClara Ruiz-González0Juan Pablo Niño-García1Martin Berggren2Paul A. del Giorgio3Instituto de Ciencias del Mar (ICM-CSIC)Universidad de Antioquia, Escuela de MicrobiologíaLund University, Department of Physical Geography and Ecosystem ScienceUniversité du Québec à Montréal, Département des Sciences Biologiques Freshwater bacterioplankton communities are influenced by the transport of bacteria from the surrounding terrestrial environments. It has been shown that, although most of these dispersed bacteria gradually disappear along the hydrologic continuum, some can thrive in aquatic systems and become dominant, leading to a gradual succession of communities. Here we aimed at exploring the environmental factors driving the structure of such contrasting bacterial populations as well as their functional properties. Using Illumina sequencing of the 16S rRNA gene, we characterized the taxonomic composition of bacterioplankton communities from 10 streams and rivers in Québec spanning the whole hydrologic continuum (river Strahler order 0 to 7), which were sampled in two occasions. With the aim to understand the fate and controls of the transported bacteria, among the taxa present at the origin of the hydrologic gradient (i.e., in the smallest headwater streams) we identified two types of dynamics: i) ‘Tourist’ taxa, which were those that decreased in abundance from the headwaters towards the largest rivers, and ii) ‘Seed’ taxa, those that increased their abundances along the hydrologic continuum. Communities changed gradually from the fast-flowing headwater streams dominated by ‘Tourist’ taxa (ca. 95% of the sequences) towards the largest rivers (Strahler order 4-7) where ‘Seed’ taxa comprised up to 80% of community sequences. Variation in taxonomic composition of the communities dominated by ‘Tourist’ taxa in streams seemed related to different degree of terrestrial inputs, whereas compositional changes in ‘Seed’ communities in the large rivers were linked to differences in autochthonous processes. Finally, the two types of communities differed significantly in their metabolic potential assessed through Biolog Ecoplates. All this suggests that hydrologic transport modulates the gradual replacement of two contrasting population types subjected to different environmental controls and with different metabolic potentials. Moreover, we show that the separate exploration of the two pools of taxa allows unveiling environmental drivers and processes operating on them that remain hidden if explored at the whole community level. https://pagepressjournals.org/index.php/aiol/article/view/7232Dispersalriver continuumenvironmental sortingaquatic bacterial communitiesIllumina sequencing. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Clara Ruiz-González Juan Pablo Niño-García Martin Berggren Paul A. del Giorgio |
spellingShingle |
Clara Ruiz-González Juan Pablo Niño-García Martin Berggren Paul A. del Giorgio Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient Advances in Oceanography and Limnology Dispersal river continuum environmental sorting aquatic bacterial communities Illumina sequencing. |
author_facet |
Clara Ruiz-González Juan Pablo Niño-García Martin Berggren Paul A. del Giorgio |
author_sort |
Clara Ruiz-González |
title |
Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient |
title_short |
Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient |
title_full |
Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient |
title_fullStr |
Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient |
title_full_unstemmed |
Contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient |
title_sort |
contrasting dynamics and environmental controls of dispersed bacteria along a hydrologic gradient |
publisher |
PAGEPress Publications |
series |
Advances in Oceanography and Limnology |
issn |
1947-5721 1947-573X |
publishDate |
2017-12-01 |
description |
Freshwater bacterioplankton communities are influenced by the transport of bacteria from the surrounding terrestrial environments. It has been shown that, although most of these dispersed bacteria gradually disappear along the hydrologic continuum, some can thrive in aquatic systems and become dominant, leading to a gradual succession of communities. Here we aimed at exploring the environmental factors driving the structure of such contrasting bacterial populations as well as their functional properties. Using Illumina sequencing of the 16S rRNA gene, we characterized the taxonomic composition of bacterioplankton communities from 10 streams and rivers in Québec spanning the whole hydrologic continuum (river Strahler order 0 to 7), which were sampled in two occasions. With the aim to understand the fate and controls of the transported bacteria, among the taxa present at the origin of the hydrologic gradient (i.e., in the smallest headwater streams) we identified two types of dynamics: i) ‘Tourist’ taxa, which were those that decreased in abundance from the headwaters towards the largest rivers, and ii) ‘Seed’ taxa, those that increased their abundances along the hydrologic continuum. Communities changed gradually from the fast-flowing headwater streams dominated by ‘Tourist’ taxa (ca. 95% of the sequences) towards the largest rivers (Strahler order 4-7) where ‘Seed’ taxa comprised up to 80% of community sequences. Variation in taxonomic composition of the communities dominated by ‘Tourist’ taxa in streams seemed related to different degree of terrestrial inputs, whereas compositional changes in ‘Seed’ communities in the large rivers were linked to differences in autochthonous processes. Finally, the two types of communities differed significantly in their metabolic potential assessed through Biolog Ecoplates. All this suggests that hydrologic transport modulates the gradual replacement of two contrasting population types subjected to different environmental controls and with different metabolic potentials. Moreover, we show that the separate exploration of the two pools of taxa allows unveiling environmental drivers and processes operating on them that remain hidden if explored at the whole community level.
|
topic |
Dispersal river continuum environmental sorting aquatic bacterial communities Illumina sequencing. |
url |
https://pagepressjournals.org/index.php/aiol/article/view/7232 |
work_keys_str_mv |
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