A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)

Being located between primary producers and fish, zooplankton are a key element of marine food webs, the trophic structure of which is dependent upon the size distribution of species. Changes in zooplankton community size structure have the potential to alter the food web structure and ultimately th...

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Autores principales:	Sophie G. Pitois, Carolyn A. Graves, Hayden Close, Christopher Lynam, James Scott, Julian Tilbury, Jeroen van der Kooij, Phil Culverhouse
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Food-web Zooplankton Size-based indicator Celtic Sea Pelagic fish Plankton Imager Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/b63a197c814646908c558354a3e0cc47
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id	oai:doaj.org-article:b63a197c814646908c558354a3e0cc47
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spelling	oai:doaj.org-article:b63a197c814646908c558354a3e0cc472021-12-01T04:42:06ZA first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)1470-160X10.1016/j.ecolind.2020.107307https://doaj.org/article/b63a197c814646908c558354a3e0cc472021-04-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20312498https://doaj.org/toc/1470-160XBeing located between primary producers and fish, zooplankton are a key element of marine food webs, the trophic structure of which is dependent upon the size distribution of species. Changes in zooplankton community size structure have the potential to alter the food web structure and ultimately the quality of food for planktivorous fish. Zooplankton therefore play a key role in overall ecosystem health and are ideal indicators of environmental variability due to their short life cycle and sensitivity to environmental changes. In this study, we used a first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator in the Celtic Sea, using a similar methodology to that of the HELCOM Mean Size and Total Stock (MSTS) indicator. We explored relationships between zooplankton mean size, total abundance and biomass with hydrographic and biological variables representative of both lower and higher trophic levels (i.e. Chlorophyll-a levels and the biomass distribution of herring, sardine, anchovy, sprat and horse mackerel). Herring, the species with the strongest preference for larger prey, was the only fish that displayed a statistically significant positive correlation with copepod mean size. Displaying the stations spatially within the 2-dimentional (copepod mean size versus abundance) indicator plots, resulted in a strong pattern of herring distribution related to areas where copepods were the largest rather than the most abundant. Our preliminary results are in line with those obtained from previous studies, confirming that zooplankton mean size is able to reflect the state of the food web, and thus reinforce the importance as zooplankton size as a key trait to be routinely monitored. Our in-situ zooplankton size measurements were collected with the Plankton Imager (PI). The ability of this automated system to take measurements for every single organism in a sample meant that the mean size was calculated based on the actual size distribution of the sampled population. Additionally, because of the non-normal distribution of copepod size, the geometric mean was found to be a much more representative description of the community size than the arithmetic mean. We have demonstrated (1) the potential of the CMSTA as a potential indicator of ecosystem health status and climate effects, and (2) the value of the PI in collecting routine in-situ zooplankton size information for improving the power of the mean size indicator approach to describe the community structure.Sophie G. PitoisCarolyn A. GravesHayden CloseChristopher LynamJames ScottJulian TilburyJeroen van der KooijPhil CulverhouseElsevierarticleFood-webZooplanktonSize-based indicatorCeltic SeaPelagic fishPlankton ImagerEcologyQH540-549.5ENEcological Indicators, Vol 123, Iss , Pp 107307- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Food-web Zooplankton Size-based indicator Celtic Sea Pelagic fish Plankton Imager Ecology QH540-549.5
spellingShingle	Food-web Zooplankton Size-based indicator Celtic Sea Pelagic fish Plankton Imager Ecology QH540-549.5 Sophie G. Pitois Carolyn A. Graves Hayden Close Christopher Lynam James Scott Julian Tilbury Jeroen van der Kooij Phil Culverhouse A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)
description	Being located between primary producers and fish, zooplankton are a key element of marine food webs, the trophic structure of which is dependent upon the size distribution of species. Changes in zooplankton community size structure have the potential to alter the food web structure and ultimately the quality of food for planktivorous fish. Zooplankton therefore play a key role in overall ecosystem health and are ideal indicators of environmental variability due to their short life cycle and sensitivity to environmental changes. In this study, we used a first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator in the Celtic Sea, using a similar methodology to that of the HELCOM Mean Size and Total Stock (MSTS) indicator. We explored relationships between zooplankton mean size, total abundance and biomass with hydrographic and biological variables representative of both lower and higher trophic levels (i.e. Chlorophyll-a levels and the biomass distribution of herring, sardine, anchovy, sprat and horse mackerel). Herring, the species with the strongest preference for larger prey, was the only fish that displayed a statistically significant positive correlation with copepod mean size. Displaying the stations spatially within the 2-dimentional (copepod mean size versus abundance) indicator plots, resulted in a strong pattern of herring distribution related to areas where copepods were the largest rather than the most abundant. Our preliminary results are in line with those obtained from previous studies, confirming that zooplankton mean size is able to reflect the state of the food web, and thus reinforce the importance as zooplankton size as a key trait to be routinely monitored. Our in-situ zooplankton size measurements were collected with the Plankton Imager (PI). The ability of this automated system to take measurements for every single organism in a sample meant that the mean size was calculated based on the actual size distribution of the sampled population. Additionally, because of the non-normal distribution of copepod size, the geometric mean was found to be a much more representative description of the community size than the arithmetic mean. We have demonstrated (1) the potential of the CMSTA as a potential indicator of ecosystem health status and climate effects, and (2) the value of the PI in collecting routine in-situ zooplankton size information for improving the power of the mean size indicator approach to describe the community structure.
format	article
author	Sophie G. Pitois Carolyn A. Graves Hayden Close Christopher Lynam James Scott Julian Tilbury Jeroen van der Kooij Phil Culverhouse
author_facet	Sophie G. Pitois Carolyn A. Graves Hayden Close Christopher Lynam James Scott Julian Tilbury Jeroen van der Kooij Phil Culverhouse
author_sort	Sophie G. Pitois
title	A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)
title_short	A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)
title_full	A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)
title_fullStr	A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)
title_full_unstemmed	A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)
title_sort	first approach to build and test the copepod mean size and total abundance (cmsta) ecological indicator using in-situ size measurements from the plankton imager (pi)
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/b63a197c814646908c558354a3e0cc47
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A first approach to build and test the Copepod Mean Size and Total Abundance (CMSTA) ecological indicator using in-situ size measurements from the Plankton Imager (PI)

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