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Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient

Despite worldwide efforts to restore degraded mangrove forests in the past decades, defining and tracking restoration success remains a major challenge. In this study, we used a multi-isotope approach to trace ecosystem responses to forest clearing and replanting in a tropical mangrove forest reserv...

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Main Authors:	Then, Amy Yee-Hui, Adame, Maria Fernanda, Fry, Brian, Chong, Ving Ching, Riekenberg, Philip M., Mohammad Zakaria, Rozainah, Lee, Shing Yip
Format:	Article
Published:	Springer 2021
Subjects:	GE Environmental Sciences QH Natural history
Online Access:	http://eprints.um.edu.my/28866/
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spelling	my.um.eprints.288662022-04-21T07:40:26Z http://eprints.um.edu.my/28866/ Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient Then, Amy Yee-Hui Adame, Maria Fernanda Fry, Brian Chong, Ving Ching Riekenberg, Philip M. Mohammad Zakaria, Rozainah Lee, Shing Yip GE Environmental Sciences QH Natural history Despite worldwide efforts to restore degraded mangrove forests in the past decades, defining and tracking restoration success remains a major challenge. In this study, we used a multi-isotope approach to trace ecosystem responses to forest clearing and replanting in a tropical mangrove forest reserve at Matang, Malaysia. We measured delta H-2 or delta D deuterium, delta C-13 and delta N-15 (HCN isotopes) in common macroinvertebrate consumers (barnacles, prawns, gastropods, and crabs) across a 70-year chronosequence of mangroves. Functional food web recovery was indicated by a decrease in delta C-13 and delta N-15 and increase in delta D for gastropod and crab consumers in older forests. Timing of this shift in food web isotopic signals took place between 5 and 15 years post-clearing of mangroves. These changes in food web function paralleled changes in crab community composition, but also reflected changes in physicochemical conditions within the forest, such as increased tree cover and shading, which resulted in a shift of the food web base from microalgal-derived to mangrove-derived organic matter. Prawns and barnacles from tidal waters adjacent to the mangrove forests were estimated to derive 17 to 25% of their nutrition from mangroves, primarily from a microbial loop that was processing localised dissolved and particulate organic matter exported from mangrove marshes. The top-down mixing model approach using combined HCN isotope measurements clearly separated inputs from mangroves versus microalgae for the first time in estuarine food web studies, and tracked ecological mangrove ecosystem recovery. This combination of tracers is recommended for future studies of mangrove conservation and restoration. Springer 2021-06 Article PeerReviewed Then, Amy Yee-Hui and Adame, Maria Fernanda and Fry, Brian and Chong, Ving Ching and Riekenberg, Philip M. and Mohammad Zakaria, Rozainah and Lee, Shing Yip (2021) Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient. Ecosystems, 24 (4). pp. 939-954. ISSN 1432-9840, DOI https://doi.org/10.1007/s10021-020-00561-0 <https://doi.org/10.1007/s10021-020-00561-0>. 10.1007/s10021-020-00561-0
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	GE Environmental Sciences QH Natural history
spellingShingle	GE Environmental Sciences QH Natural history Then, Amy Yee-Hui Adame, Maria Fernanda Fry, Brian Chong, Ving Ching Riekenberg, Philip M. Mohammad Zakaria, Rozainah Lee, Shing Yip Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient
description	Despite worldwide efforts to restore degraded mangrove forests in the past decades, defining and tracking restoration success remains a major challenge. In this study, we used a multi-isotope approach to trace ecosystem responses to forest clearing and replanting in a tropical mangrove forest reserve at Matang, Malaysia. We measured delta H-2 or delta D deuterium, delta C-13 and delta N-15 (HCN isotopes) in common macroinvertebrate consumers (barnacles, prawns, gastropods, and crabs) across a 70-year chronosequence of mangroves. Functional food web recovery was indicated by a decrease in delta C-13 and delta N-15 and increase in delta D for gastropod and crab consumers in older forests. Timing of this shift in food web isotopic signals took place between 5 and 15 years post-clearing of mangroves. These changes in food web function paralleled changes in crab community composition, but also reflected changes in physicochemical conditions within the forest, such as increased tree cover and shading, which resulted in a shift of the food web base from microalgal-derived to mangrove-derived organic matter. Prawns and barnacles from tidal waters adjacent to the mangrove forests were estimated to derive 17 to 25% of their nutrition from mangroves, primarily from a microbial loop that was processing localised dissolved and particulate organic matter exported from mangrove marshes. The top-down mixing model approach using combined HCN isotope measurements clearly separated inputs from mangroves versus microalgae for the first time in estuarine food web studies, and tracked ecological mangrove ecosystem recovery. This combination of tracers is recommended for future studies of mangrove conservation and restoration.
format	Article
author	Then, Amy Yee-Hui Adame, Maria Fernanda Fry, Brian Chong, Ving Ching Riekenberg, Philip M. Mohammad Zakaria, Rozainah Lee, Shing Yip
author_facet	Then, Amy Yee-Hui Adame, Maria Fernanda Fry, Brian Chong, Ving Ching Riekenberg, Philip M. Mohammad Zakaria, Rozainah Lee, Shing Yip
author_sort	Then, Amy Yee-Hui
title	Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient
title_short	Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient
title_full	Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient
title_fullStr	Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient
title_full_unstemmed	Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient
title_sort	stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient
publisher	Springer
publishDate	2021
url	http://eprints.um.edu.my/28866/
_version_	1735409581617577984
score	13.211869

Stable isotopes clearly track mangrove inputs and food web changes along a reforestation gradient

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