Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth

Abstract Algal biofilms in streams are simultaneously controlled by light and nutrient availability (bottom-up control) and by grazing activity (top-down control). In addition to promoting algal growth, light and nutrients also determine the nutritional quality of algae for grazers. While short-term...

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Autores principales:	Alessandra Iannino, Patrick Fink, Markus Weitere
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/042e0d0080e540398d09693f6e5c28c7
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spelling	oai:doaj.org-article:042e0d0080e540398d09693f6e5c28c72021-11-08T10:50:21ZFeedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth10.1038/s41598-021-00856-92045-2322https://doaj.org/article/042e0d0080e540398d09693f6e5c28c72021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-00856-9https://doaj.org/toc/2045-2322Abstract Algal biofilms in streams are simultaneously controlled by light and nutrient availability (bottom-up control) and by grazing activity (top-down control). In addition to promoting algal growth, light and nutrients also determine the nutritional quality of algae for grazers. While short-term experiments have shown that grazers increase consumption rates of nutrient-poor algae due to compensatory feeding, nutrient limitation in the long run can constrain grazer growth and hence limit the strength of grazing activity. In this study, we tested the effects of light and phosphorus availability on grazer growth and thus on the long-term control of algal biomass. At the end of the experiment, algal biomass was significantly affected by light, phosphorus and grazing, but the interactive effects of the three factors significantly changed over time. At both high light and phosphorus supply, grazing did not initially reduce algal biomass, but the effect of grazing became stronger in the final three weeks of the experiment. Snail growth was enhanced by light, rather than phosphorus, suggesting that algal quantity rather than quality was the main limiting factor for grazer growth. Our results highlight the role of feedback effects and the importance of long-term experiments in the study of foodweb interactions.Alessandra IanninoPatrick FinkMarkus WeitereNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alessandra Iannino Patrick Fink Markus Weitere Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth
description	Abstract Algal biofilms in streams are simultaneously controlled by light and nutrient availability (bottom-up control) and by grazing activity (top-down control). In addition to promoting algal growth, light and nutrients also determine the nutritional quality of algae for grazers. While short-term experiments have shown that grazers increase consumption rates of nutrient-poor algae due to compensatory feeding, nutrient limitation in the long run can constrain grazer growth and hence limit the strength of grazing activity. In this study, we tested the effects of light and phosphorus availability on grazer growth and thus on the long-term control of algal biomass. At the end of the experiment, algal biomass was significantly affected by light, phosphorus and grazing, but the interactive effects of the three factors significantly changed over time. At both high light and phosphorus supply, grazing did not initially reduce algal biomass, but the effect of grazing became stronger in the final three weeks of the experiment. Snail growth was enhanced by light, rather than phosphorus, suggesting that algal quantity rather than quality was the main limiting factor for grazer growth. Our results highlight the role of feedback effects and the importance of long-term experiments in the study of foodweb interactions.
format	article
author	Alessandra Iannino Patrick Fink Markus Weitere
author_facet	Alessandra Iannino Patrick Fink Markus Weitere
author_sort	Alessandra Iannino
title	Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth
title_short	Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth
title_full	Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth
title_fullStr	Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth
title_full_unstemmed	Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth
title_sort	feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/042e0d0080e540398d09693f6e5c28c7
work_keys_str_mv	AT alessandraiannino feedbackbetweenbottomupandtopdowncontrolofstreambiofilmmediatedthrougheutrophicationeffectsongrazergrowth AT patrickfink feedbackbetweenbottomupandtopdowncontrolofstreambiofilmmediatedthrougheutrophicationeffectsongrazergrowth AT markusweitere feedbackbetweenbottomupandtopdowncontrolofstreambiofilmmediatedthrougheutrophicationeffectsongrazergrowth
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Feedback between bottom-up and top-down control of stream biofilm mediated through eutrophication effects on grazer growth

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