On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis
The objective of this study was to quantify the functional response in feeding rate in the various developmental stages of Calanus finmarchicus to different concentrations of the diatoms Thalassiosira nordenskioeldii and Porosira glacialis , and the haptophysean Phaeocystis pouchetii . Grazing of co...
Published in: | Journal of Plankton Research |
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Oxford University Press
1990
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fthighwire:oai:open-archive.highwire.org:plankt:12/6/1173 2023-05-15T15:47:57+02:00 On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis Hansen, B. Tande, K.S. Berggreen, U.C. 1990-01-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/12/6/1173 https://doi.org/10.1093/plankt/12.6.1173 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/12/6/1173 http://dx.doi.org/10.1093/plankt/12.6.1173 Copyright (C) 1990, Oxford University Press Articles TEXT 1990 fthighwire https://doi.org/10.1093/plankt/12.6.1173 2007-06-25T04:50:32Z The objective of this study was to quantify the functional response in feeding rate in the various developmental stages of Calanus finmarchicus to different concentrations of the diatoms Thalassiosira nordenskioeldii and Porosira glacialis , and the haptophysean Phaeocystis pouchetii . Grazing of copepodite stage I–V C.finmarchicus was measured using two different approaches. Feeding rates were obtained from either incubation experiments, estimating the rate of removal of particles from suspension, or by quantifying the turnover rate of the plant pigments in the gut. Clearance as a function of algal concentration (1–30 μg plant pigment 1−1) was described in juvenile stages of C.finmarchicus fed the diatoms T.nordenskioeldii [∼20 μm equivalent spherical diameter (ESD)], P.glacialis (∼40 μm ESD), and two size categories (30–100 μm and >100 μm ESD) of the gelatinous alga P.pouchetii . When the copepodite stages were fed T.nordenskioeldii , the gut content of plant pigments was in general higher than when fed P.glacialis . Rates obtained were variable when the same copepodite stages were offered the two size categories of P.pouchetii , but within the same order of magnitude as those obtained for the larger diatom. At unialgal diets, diatoms were more readily consumed than the larger size fraction among colonies of P.pouchetii by copepodite stage I–III C.finmarchicus . But given an appropriate prey size, C.finmarchicus grazed both diatoms and colonies of gelatinous algae at equal rates. A linear relationship between gut content and food concentrations <10 μg chlorophyll 1−1 was found. This indicates that the ingestion rate in C.finmarchicus is directly proportional to the ambient food concentration during the most productive period in May and June in high latitudes irrespective of algal species present. Text Calanus finmarchicus HighWire Press (Stanford University) Journal of Plankton Research 12 6 1173 1187 |
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Articles Hansen, B. Tande, K.S. Berggreen, U.C. On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis |
topic_facet |
Articles |
description |
The objective of this study was to quantify the functional response in feeding rate in the various developmental stages of Calanus finmarchicus to different concentrations of the diatoms Thalassiosira nordenskioeldii and Porosira glacialis , and the haptophysean Phaeocystis pouchetii . Grazing of copepodite stage I–V C.finmarchicus was measured using two different approaches. Feeding rates were obtained from either incubation experiments, estimating the rate of removal of particles from suspension, or by quantifying the turnover rate of the plant pigments in the gut. Clearance as a function of algal concentration (1–30 μg plant pigment 1−1) was described in juvenile stages of C.finmarchicus fed the diatoms T.nordenskioeldii [∼20 μm equivalent spherical diameter (ESD)], P.glacialis (∼40 μm ESD), and two size categories (30–100 μm and >100 μm ESD) of the gelatinous alga P.pouchetii . When the copepodite stages were fed T.nordenskioeldii , the gut content of plant pigments was in general higher than when fed P.glacialis . Rates obtained were variable when the same copepodite stages were offered the two size categories of P.pouchetii , but within the same order of magnitude as those obtained for the larger diatom. At unialgal diets, diatoms were more readily consumed than the larger size fraction among colonies of P.pouchetii by copepodite stage I–III C.finmarchicus . But given an appropriate prey size, C.finmarchicus grazed both diatoms and colonies of gelatinous algae at equal rates. A linear relationship between gut content and food concentrations <10 μg chlorophyll 1−1 was found. This indicates that the ingestion rate in C.finmarchicus is directly proportional to the ambient food concentration during the most productive period in May and June in high latitudes irrespective of algal species present. |
format |
Text |
author |
Hansen, B. Tande, K.S. Berggreen, U.C. |
author_facet |
Hansen, B. Tande, K.S. Berggreen, U.C. |
author_sort |
Hansen, B. |
title |
On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis |
title_short |
On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis |
title_full |
On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis |
title_fullStr |
On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis |
title_full_unstemmed |
On the trophic fate of Phaeocystis pouchetii (Harlot). III. Functional responses in grazing demonstrated on juvenile stages of Calanus finmarchicus (Copepoda) fed diatoms and Phaeocystis |
title_sort |
on the trophic fate of phaeocystis pouchetii (harlot). iii. functional responses in grazing demonstrated on juvenile stages of calanus finmarchicus (copepoda) fed diatoms and phaeocystis |
publisher |
Oxford University Press |
publishDate |
1990 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/12/6/1173 https://doi.org/10.1093/plankt/12.6.1173 |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/12/6/1173 http://dx.doi.org/10.1093/plankt/12.6.1173 |
op_rights |
Copyright (C) 1990, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/12.6.1173 |
container_title |
Journal of Plankton Research |
container_volume |
12 |
container_issue |
6 |
container_start_page |
1173 |
op_container_end_page |
1187 |
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1766382938408091648 |