Local spatial distribution of stream macroalgae – does gastropod activity matters?
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1127/fal/2021/1370 http://hdl.handle.net/11449/233882 |
Resumo: | The effects of gastropod Biomphalaria sp. on the benthic algae community (micro and macroalgae) were experimentally studied in an unshaded artificial stream. Using artificial substrates, two treatments were tested: with herbivores and without herbivores. The substrates remained submerged for 50 days, and the environmental and biological variables (algal abundance and richness) were obtained on days 7, 15, 30, 40 and 50 after the experiment has been installed. Repeated measure analyses of variance were applied to verify possible differences of chlorophyll-a content, species richness, microalgal density and macroalgal density and percent cover between treatments at each date. Results showed that herbivory pressure reduces significantly all measured biotic variables except algal rich-ness. Higher presence of macroalgae was related to a higher presence of microalgae in the substrates, indicating a potential relationship between these components. Thus, it seems that herbivore activity over microalgal biomass may have an indirect and negative effect on macroalgae, so that a reduction in microalgal density by grazing may have led to a corresponding decrease in abundance of macroalgae. Thus, the results suggest that the establishment and development of macroalgae in lotic environments can be regulated by a top-down cascade effect, in which the action of herbivores, herein the scraper Biomphalaria sp., on microalgae indirectly impacts the abundance of macroalgae. |
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Local spatial distribution of stream macroalgae – does gastropod activity matters?HerbivoryMacroalgaeMicroalgaeStreamsTop-down controlThe effects of gastropod Biomphalaria sp. on the benthic algae community (micro and macroalgae) were experimentally studied in an unshaded artificial stream. Using artificial substrates, two treatments were tested: with herbivores and without herbivores. The substrates remained submerged for 50 days, and the environmental and biological variables (algal abundance and richness) were obtained on days 7, 15, 30, 40 and 50 after the experiment has been installed. Repeated measure analyses of variance were applied to verify possible differences of chlorophyll-a content, species richness, microalgal density and macroalgal density and percent cover between treatments at each date. Results showed that herbivory pressure reduces significantly all measured biotic variables except algal rich-ness. Higher presence of macroalgae was related to a higher presence of microalgae in the substrates, indicating a potential relationship between these components. Thus, it seems that herbivore activity over microalgal biomass may have an indirect and negative effect on macroalgae, so that a reduction in microalgal density by grazing may have led to a corresponding decrease in abundance of macroalgae. Thus, the results suggest that the establishment and development of macroalgae in lotic environments can be regulated by a top-down cascade effect, in which the action of herbivores, herein the scraper Biomphalaria sp., on microalgae indirectly impacts the abundance of macroalgae.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Laboratory of Aquatic Biology University of São Paulo State (UNESP)Laboratory of Aquatic Biology University of São Paulo State (UNESP)FAPESP: 2010/17563-0FAPESP: 2014/22952-6CNPq: 302354/2008-5Universidade Estadual Paulista (UNESP)Tonetto, Aurélio Fajar [UNESP]Branco, Ciro Cesar Zanini [UNESP]2022-05-01T11:07:39Z2022-05-01T11:07:39Z2021-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article199-209http://dx.doi.org/10.1127/fal/2021/1370Fundamental and Applied Limnology, v. 195, n. 3, p. 199-209, 2021.2363-71101863-9135http://hdl.handle.net/11449/23388210.1127/fal/2021/13702-s2.0-85120802317Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengFundamental and Applied Limnologyinfo:eu-repo/semantics/openAccess2024-06-13T17:38:20Zoai:repositorio.unesp.br:11449/233882Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:27:01.772645Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Local spatial distribution of stream macroalgae – does gastropod activity matters? |
title |
Local spatial distribution of stream macroalgae – does gastropod activity matters? |
spellingShingle |
Local spatial distribution of stream macroalgae – does gastropod activity matters? Tonetto, Aurélio Fajar [UNESP] Herbivory Macroalgae Microalgae Streams Top-down control |
title_short |
Local spatial distribution of stream macroalgae – does gastropod activity matters? |
title_full |
Local spatial distribution of stream macroalgae – does gastropod activity matters? |
title_fullStr |
Local spatial distribution of stream macroalgae – does gastropod activity matters? |
title_full_unstemmed |
Local spatial distribution of stream macroalgae – does gastropod activity matters? |
title_sort |
Local spatial distribution of stream macroalgae – does gastropod activity matters? |
author |
Tonetto, Aurélio Fajar [UNESP] |
author_facet |
Tonetto, Aurélio Fajar [UNESP] Branco, Ciro Cesar Zanini [UNESP] |
author_role |
author |
author2 |
Branco, Ciro Cesar Zanini [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Tonetto, Aurélio Fajar [UNESP] Branco, Ciro Cesar Zanini [UNESP] |
dc.subject.por.fl_str_mv |
Herbivory Macroalgae Microalgae Streams Top-down control |
topic |
Herbivory Macroalgae Microalgae Streams Top-down control |
description |
The effects of gastropod Biomphalaria sp. on the benthic algae community (micro and macroalgae) were experimentally studied in an unshaded artificial stream. Using artificial substrates, two treatments were tested: with herbivores and without herbivores. The substrates remained submerged for 50 days, and the environmental and biological variables (algal abundance and richness) were obtained on days 7, 15, 30, 40 and 50 after the experiment has been installed. Repeated measure analyses of variance were applied to verify possible differences of chlorophyll-a content, species richness, microalgal density and macroalgal density and percent cover between treatments at each date. Results showed that herbivory pressure reduces significantly all measured biotic variables except algal rich-ness. Higher presence of macroalgae was related to a higher presence of microalgae in the substrates, indicating a potential relationship between these components. Thus, it seems that herbivore activity over microalgal biomass may have an indirect and negative effect on macroalgae, so that a reduction in microalgal density by grazing may have led to a corresponding decrease in abundance of macroalgae. Thus, the results suggest that the establishment and development of macroalgae in lotic environments can be regulated by a top-down cascade effect, in which the action of herbivores, herein the scraper Biomphalaria sp., on microalgae indirectly impacts the abundance of macroalgae. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12-01 2022-05-01T11:07:39Z 2022-05-01T11:07:39Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1127/fal/2021/1370 Fundamental and Applied Limnology, v. 195, n. 3, p. 199-209, 2021. 2363-7110 1863-9135 http://hdl.handle.net/11449/233882 10.1127/fal/2021/1370 2-s2.0-85120802317 |
url |
http://dx.doi.org/10.1127/fal/2021/1370 http://hdl.handle.net/11449/233882 |
identifier_str_mv |
Fundamental and Applied Limnology, v. 195, n. 3, p. 199-209, 2021. 2363-7110 1863-9135 10.1127/fal/2021/1370 2-s2.0-85120802317 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Fundamental and Applied Limnology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
199-209 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128814157398016 |