Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea

The East China Sea (ECS) is the most important fishing ground in China. Field observations have always found no positive correlation between phytoplankton stocks and zooplankton biomass in the ESC. It has been suggested that under eutrophic conditions, the phytoplankton biomass is too high to limit...

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Autores principales:	Dong Sun, Yixiang Chen, Yunzhi Feng, Zhensheng Liu, Xin Peng, Yuming Cai, Peisong Yu, Chunsheng Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Body size Size diversity Size spectrum Trophic transfer efficiency Carrying capacity Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/35f9d573cc994a61b66376bbf55dfe81
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spelling	oai:doaj.org-article:35f9d573cc994a61b66376bbf55dfe812021-12-01T05:00:36ZSeasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea1470-160X10.1016/j.ecolind.2021.108201https://doaj.org/article/35f9d573cc994a61b66376bbf55dfe812021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21008669https://doaj.org/toc/1470-160XThe East China Sea (ECS) is the most important fishing ground in China. Field observations have always found no positive correlation between phytoplankton stocks and zooplankton biomass in the ESC. It has been suggested that under eutrophic conditions, the phytoplankton biomass is too high to limit mesozooplankton growth and lower the energy transfer efficiency from phytoplankton to mesozooplankton. However, this hypothesis does not explain the higher zooplankton biomass supported by lower chlorophyll a in offshore waters. This situation can be referred to as a “mismatch between phytoplankton and mesozooplankton” or “variation of Z/P”. In this study, we used field data covering four seasons to test four hypotheses that (a) flatter slope of normalized biomass size spectrum (NBSS) of mesozooplankton enhances the Z/P; (b) higher mesozooplankton size diversity enhances the Z/P; (c) stronger predatory pressure from zooplanktivorous fish decreases the Z/P; and (d) larger-sized primary producers enhance the Z/P. The results of our study confirm that the size diversity of zooplankton was the most important determinant of spatial variation of Z/P in the ECS in each season except winter. The NBSS slope of zooplankton was also an important factor, but only significant in summer. Other potential mechanisms, including predation pressure from zooplanktivorous fish and larger-sized primary producers, were not determinants. This seasonal change was possibly due to seasonal variations of zooplankton community structure and functional structure in ECS, especially the large-sized and omnivorous Calanus sinicus transported by the stronger ECS Coastal Current during the winter. Our findings highlight the importance of a size diversity approach in the evaluation of the carrying capacity for fish in coastal ecosystems with conspicuous temporal and spatial variations.Dong SunYixiang ChenYunzhi FengZhensheng LiuXin PengYuming CaiPeisong YuChunsheng WangElsevierarticleBody sizeSize diversitySize spectrumTrophic transfer efficiencyCarrying capacityEcologyQH540-549.5ENEcological Indicators, Vol 131, Iss , Pp 108201- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Body size Size diversity Size spectrum Trophic transfer efficiency Carrying capacity Ecology QH540-549.5
spellingShingle	Body size Size diversity Size spectrum Trophic transfer efficiency Carrying capacity Ecology QH540-549.5 Dong Sun Yixiang Chen Yunzhi Feng Zhensheng Liu Xin Peng Yuming Cai Peisong Yu Chunsheng Wang Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea
description	The East China Sea (ECS) is the most important fishing ground in China. Field observations have always found no positive correlation between phytoplankton stocks and zooplankton biomass in the ESC. It has been suggested that under eutrophic conditions, the phytoplankton biomass is too high to limit mesozooplankton growth and lower the energy transfer efficiency from phytoplankton to mesozooplankton. However, this hypothesis does not explain the higher zooplankton biomass supported by lower chlorophyll a in offshore waters. This situation can be referred to as a “mismatch between phytoplankton and mesozooplankton” or “variation of Z/P”. In this study, we used field data covering four seasons to test four hypotheses that (a) flatter slope of normalized biomass size spectrum (NBSS) of mesozooplankton enhances the Z/P; (b) higher mesozooplankton size diversity enhances the Z/P; (c) stronger predatory pressure from zooplanktivorous fish decreases the Z/P; and (d) larger-sized primary producers enhance the Z/P. The results of our study confirm that the size diversity of zooplankton was the most important determinant of spatial variation of Z/P in the ECS in each season except winter. The NBSS slope of zooplankton was also an important factor, but only significant in summer. Other potential mechanisms, including predation pressure from zooplanktivorous fish and larger-sized primary producers, were not determinants. This seasonal change was possibly due to seasonal variations of zooplankton community structure and functional structure in ECS, especially the large-sized and omnivorous Calanus sinicus transported by the stronger ECS Coastal Current during the winter. Our findings highlight the importance of a size diversity approach in the evaluation of the carrying capacity for fish in coastal ecosystems with conspicuous temporal and spatial variations.
format	article
author	Dong Sun Yixiang Chen Yunzhi Feng Zhensheng Liu Xin Peng Yuming Cai Peisong Yu Chunsheng Wang
author_facet	Dong Sun Yixiang Chen Yunzhi Feng Zhensheng Liu Xin Peng Yuming Cai Peisong Yu Chunsheng Wang
author_sort	Dong Sun
title	Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea
title_short	Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea
title_full	Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea
title_fullStr	Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea
title_full_unstemmed	Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea
title_sort	seasonal variation in size diversity: explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the east china sea
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/35f9d573cc994a61b66376bbf55dfe81
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Seasonal variation in size diversity: Explaining the spatial mismatch between phytoplankton and mesozooplankton in fishing grounds of the East China Sea

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