Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton
Bottle incubation experiments are widely used in mesozooplankton grazing studies. However, we have shown here that traditional particle removal experiments with Calanus finmarchicus and C. helgolandicus as grazers on natural plankton may yield low or even statistically significant (p < 0.05) nega...
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Language: | English |
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2001
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Online Access: | http://hdl.handle.net/11250/108346 https://doi.org/10.3354/meps221059 |
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ftimr:oai:imr.brage.unit.no:11250/108346 2023-05-15T15:48:02+02:00 Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton Nejstgaard, Jens Christian Naustvoll, Lars-Johan Sazhin, Andrey 2001-10-18 294925 bytes application/pdf http://hdl.handle.net/11250/108346 https://doi.org/10.3354/meps221059 eng eng urn:issn:0171-8630 http://hdl.handle.net/11250/108346 http://dx.doi.org/10.3354/meps221059 59-75 221 Marine Ecology Progress Series zooplankton Journal article Peer reviewed 2001 ftimr https://doi.org/10.3354/meps221059 2021-09-23T20:14:33Z Bottle incubation experiments are widely used in mesozooplankton grazing studies. However, we have shown here that traditional particle removal experiments with Calanus finmarchicus and C. helgolandicus as grazers on natural plankton may yield low or even statistically significant (p < 0.05) negative grazing estimates, even though negative grazing rates are impossible. Low grazing rates are often reported, especially on smaller prey types, despite abundant food and significant egg production. Microzooplankton, such as ciliates, show higher biomass-specific grazing rates on algae than do copepods and other mesozooplankton. Instead, copepods often selectively feed on the microzooplankton. Thus, apparent negative rates would be expected when the release of microzooplankton grazing pressure outweighs the copepod grazing rates on the same food items in the incubation bottle. We show that this potentially large bias increases with microzooplankton community grazing pressure in the control. A simplified general method to correct for this bias is presented and compared with the original method (Nejstgaard et al. 1997, Mar Ecol Prog Ser 147:197–217). Although complexity and the need for taxonomic accuracy are reduced in the general method, the results are not significantly different between the 2 methods. Both methods also show a good fit with ingestion rates estimated from faecal pellet production. We suggest that the general method be combined with automated sample treatment in future studies. In addition, we argue that carefully estimated faecal volume production provides a simple and quick overall feeding estimate with important advantages over the common gut pigment technique, and it may be used as an independent method in bottle incubation experiments. Article in Journal/Newspaper Calanus finmarchicus Copepods Institute for Marine Research: Brage IMR Marine Ecology Progress Series 221 59 75 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
zooplankton |
spellingShingle |
zooplankton Nejstgaard, Jens Christian Naustvoll, Lars-Johan Sazhin, Andrey Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton |
topic_facet |
zooplankton |
description |
Bottle incubation experiments are widely used in mesozooplankton grazing studies. However, we have shown here that traditional particle removal experiments with Calanus finmarchicus and C. helgolandicus as grazers on natural plankton may yield low or even statistically significant (p < 0.05) negative grazing estimates, even though negative grazing rates are impossible. Low grazing rates are often reported, especially on smaller prey types, despite abundant food and significant egg production. Microzooplankton, such as ciliates, show higher biomass-specific grazing rates on algae than do copepods and other mesozooplankton. Instead, copepods often selectively feed on the microzooplankton. Thus, apparent negative rates would be expected when the release of microzooplankton grazing pressure outweighs the copepod grazing rates on the same food items in the incubation bottle. We show that this potentially large bias increases with microzooplankton community grazing pressure in the control. A simplified general method to correct for this bias is presented and compared with the original method (Nejstgaard et al. 1997, Mar Ecol Prog Ser 147:197–217). Although complexity and the need for taxonomic accuracy are reduced in the general method, the results are not significantly different between the 2 methods. Both methods also show a good fit with ingestion rates estimated from faecal pellet production. We suggest that the general method be combined with automated sample treatment in future studies. In addition, we argue that carefully estimated faecal volume production provides a simple and quick overall feeding estimate with important advantages over the common gut pigment technique, and it may be used as an independent method in bottle incubation experiments. |
format |
Article in Journal/Newspaper |
author |
Nejstgaard, Jens Christian Naustvoll, Lars-Johan Sazhin, Andrey |
author_facet |
Nejstgaard, Jens Christian Naustvoll, Lars-Johan Sazhin, Andrey |
author_sort |
Nejstgaard, Jens Christian |
title |
Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton |
title_short |
Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton |
title_full |
Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton |
title_fullStr |
Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton |
title_full_unstemmed |
Correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton |
title_sort |
correcting for underestimation of microzooplankton grazing in bottle incubation experiments with mesozooplankton |
publishDate |
2001 |
url |
http://hdl.handle.net/11250/108346 https://doi.org/10.3354/meps221059 |
genre |
Calanus finmarchicus Copepods |
genre_facet |
Calanus finmarchicus Copepods |
op_source |
59-75 221 Marine Ecology Progress Series |
op_relation |
urn:issn:0171-8630 http://hdl.handle.net/11250/108346 http://dx.doi.org/10.3354/meps221059 |
op_doi |
https://doi.org/10.3354/meps221059 |
container_title |
Marine Ecology Progress Series |
container_volume |
221 |
container_start_page |
59 |
op_container_end_page |
75 |
_version_ |
1766383034476527616 |