Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China

The current paradigm emphasizes the trophic role of epiphytic algae in seagrass-based food webs. However, a growing body of literature demonstrates that grazers would directly cause considerable damage to seagrass rather than targeting epiphytes, perhaps depending on seagrass traits. Here, we analyz...

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Autores principales:	Jinlan Lin, Xinming Liu, Tinghe Lai, Binyuan He, Jianguo Du, Xinqing Zheng
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Trophic link Stable isotope Macrozoobenthos Nekton Carbon flow Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/f4917bdf5054447991b2b393e782b5ae
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spelling	oai:doaj.org-article:f4917bdf5054447991b2b393e782b5ae2021-12-01T04:49:20ZTrophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China1470-160X10.1016/j.ecolind.2021.107607https://doaj.org/article/f4917bdf5054447991b2b393e782b5ae2021-06-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21002727https://doaj.org/toc/1470-160XThe current paradigm emphasizes the trophic role of epiphytic algae in seagrass-based food webs. However, a growing body of literature demonstrates that grazers would directly cause considerable damage to seagrass rather than targeting epiphytes, perhaps depending on seagrass traits. Here, we analyzed δ13C and δ15N signatures of macrozoobenthos, nekton and their potential organic carbon sources in Halophila ovalis seagrass bed and adjacent waters on the Hepu coast (Beihai, China) to test the hypothesis that Halophila with high nutritive values and fragile leaf-fracture traits may be a key carbon source. The δ13C values of most consumers either fell between H. ovalis (−14.7 ± 0.7‰) and benthic microalgae (microphytobenthos and Halophila’s epiphytes, −19.9 to −19.3‰), or approached the δ13C of H. ovalis, suggesting that H. ovalis and microalgae is basal carbon sources in Halophila-based food web. Further quantification based on a 4-end-member MixSIAR model showed that H. ovalis is the most important basal carbon source, supporting 4 out of 6 trophic groups of macrozoobenthos, and 4 out of 7 nektonic trophic groups (a total of 22 species, accounting for 84.6% in nekton). The mean contribution was 37.2–75.3% for macrozoobenthos and 51.1–64.4% for nekton, respectively. Most macrozoobenthos directly or indirectly assimilated H. ovalis or its detritus and were then mainly utilized by nekton except for bivalves which largely fed on suspended microphytobenthos and particulate organic matter (POM), and porifera filtered POM. Our results re-examined the trophic function of seagrass in seagrass-based food web and emphasize the importance of protecting Halophila resources.Jinlan LinXinming LiuTinghe LaiBinyuan HeJianguo DuXinqing ZhengElsevierarticleTrophic linkStable isotopeMacrozoobenthosNektonCarbon flowEcologyQH540-549.5ENEcological Indicators, Vol 125, Iss , Pp 107607- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Trophic link Stable isotope Macrozoobenthos Nekton Carbon flow Ecology QH540-549.5
spellingShingle	Trophic link Stable isotope Macrozoobenthos Nekton Carbon flow Ecology QH540-549.5 Jinlan Lin Xinming Liu Tinghe Lai Binyuan He Jianguo Du Xinqing Zheng Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China
description	The current paradigm emphasizes the trophic role of epiphytic algae in seagrass-based food webs. However, a growing body of literature demonstrates that grazers would directly cause considerable damage to seagrass rather than targeting epiphytes, perhaps depending on seagrass traits. Here, we analyzed δ13C and δ15N signatures of macrozoobenthos, nekton and their potential organic carbon sources in Halophila ovalis seagrass bed and adjacent waters on the Hepu coast (Beihai, China) to test the hypothesis that Halophila with high nutritive values and fragile leaf-fracture traits may be a key carbon source. The δ13C values of most consumers either fell between H. ovalis (−14.7 ± 0.7‰) and benthic microalgae (microphytobenthos and Halophila’s epiphytes, −19.9 to −19.3‰), or approached the δ13C of H. ovalis, suggesting that H. ovalis and microalgae is basal carbon sources in Halophila-based food web. Further quantification based on a 4-end-member MixSIAR model showed that H. ovalis is the most important basal carbon source, supporting 4 out of 6 trophic groups of macrozoobenthos, and 4 out of 7 nektonic trophic groups (a total of 22 species, accounting for 84.6% in nekton). The mean contribution was 37.2–75.3% for macrozoobenthos and 51.1–64.4% for nekton, respectively. Most macrozoobenthos directly or indirectly assimilated H. ovalis or its detritus and were then mainly utilized by nekton except for bivalves which largely fed on suspended microphytobenthos and particulate organic matter (POM), and porifera filtered POM. Our results re-examined the trophic function of seagrass in seagrass-based food web and emphasize the importance of protecting Halophila resources.
format	article
author	Jinlan Lin Xinming Liu Tinghe Lai Binyuan He Jianguo Du Xinqing Zheng
author_facet	Jinlan Lin Xinming Liu Tinghe Lai Binyuan He Jianguo Du Xinqing Zheng
author_sort	Jinlan Lin
title	Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China
title_short	Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China
title_full	Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China
title_fullStr	Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China
title_full_unstemmed	Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China
title_sort	trophic importance of the seagrass halophila ovalis in the food web of a hepu seagrass bed and adjacent waters, beihai, china
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/f4917bdf5054447991b2b393e782b5ae
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Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China

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