Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus
Atlantic mackerel Scomber scombrus had low clearance rates when fed older stage copepodites of the copepod Calanus finmarchicus at high concentrations and high clearance rates at low concentrations. These rates were consistent with filter feeding at high concentrations and particulate feeding at low...
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1998
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1284 2023-07-30T04:02:46+02:00 Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus Macy, William K. Sutherland, Sandra J. Durbin, Edward G. 1998-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/217 https://doi.org/10.3354/meps172089 https://digitalcommons.uri.edu/context/gsofacpubs/article/1284/viewcontent/Macy_etal_EffectsZooplankton_1998.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/217 doi:10.3354/meps172089 https://digitalcommons.uri.edu/context/gsofacpubs/article/1284/viewcontent/Macy_etal_EffectsZooplankton_1998.pdf Graduate School of Oceanography Faculty Publications text 1998 ftunivrhodeislan https://doi.org/10.3354/meps172089 2023-07-17T18:56:30Z Atlantic mackerel Scomber scombrus had low clearance rates when fed older stage copepodites of the copepod Calanus finmarchicus at high concentrations and high clearance rates at low concentrations. These rates were consistent with filter feeding at high concentrations and particulate feeding at low concentrations. Intermediate and small copepods presented together at high concentrations were cleared at lower rates than the large C. finmarchicus, suggesting lower filtration efficiencies. Intermediate and small copepods were presented over a range of light intensities (8.2 x 10-8 to 1.6 x 100 µE m-2 s-1). Feeding rate did not change significantly between 1.6 x 100 and 2.0 x 10-6 µE m-2 s-1, but decreased to nearly zero at 8.2 x 10-8 µE m-2 s-1, indicating a light intensity threshold for feeding of about 10-7 µE m-2 s-1. This threshold enables mackerel to feed throughout the night near the ocean surface. Swimming speed decreased to a lesser degree than feeding rate at the lowest light intensity, indicating that the change in filter-feeding rate is only partially due to the change in speed. The school dispersed in both low and high light levels, but spacing between fish did not appear to be related to feeding rate. Text Calanus finmarchicus Copepods University of Rhode Island: DigitalCommons@URI Marine Ecology Progress Series 172 89 100 |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
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description |
Atlantic mackerel Scomber scombrus had low clearance rates when fed older stage copepodites of the copepod Calanus finmarchicus at high concentrations and high clearance rates at low concentrations. These rates were consistent with filter feeding at high concentrations and particulate feeding at low concentrations. Intermediate and small copepods presented together at high concentrations were cleared at lower rates than the large C. finmarchicus, suggesting lower filtration efficiencies. Intermediate and small copepods were presented over a range of light intensities (8.2 x 10-8 to 1.6 x 100 µE m-2 s-1). Feeding rate did not change significantly between 1.6 x 100 and 2.0 x 10-6 µE m-2 s-1, but decreased to nearly zero at 8.2 x 10-8 µE m-2 s-1, indicating a light intensity threshold for feeding of about 10-7 µE m-2 s-1. This threshold enables mackerel to feed throughout the night near the ocean surface. Swimming speed decreased to a lesser degree than feeding rate at the lowest light intensity, indicating that the change in filter-feeding rate is only partially due to the change in speed. The school dispersed in both low and high light levels, but spacing between fish did not appear to be related to feeding rate. |
format |
Text |
author |
Macy, William K. Sutherland, Sandra J. Durbin, Edward G. |
spellingShingle |
Macy, William K. Sutherland, Sandra J. Durbin, Edward G. Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus |
author_facet |
Macy, William K. Sutherland, Sandra J. Durbin, Edward G. |
author_sort |
Macy, William K. |
title |
Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus |
title_short |
Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus |
title_full |
Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus |
title_fullStr |
Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus |
title_full_unstemmed |
Effects of zooplankton size and concentration and light intensity on the feeding behavior of Atlantic mackerel Scomber scombrus |
title_sort |
effects of zooplankton size and concentration and light intensity on the feeding behavior of atlantic mackerel scomber scombrus |
publisher |
DigitalCommons@URI |
publishDate |
1998 |
url |
https://digitalcommons.uri.edu/gsofacpubs/217 https://doi.org/10.3354/meps172089 https://digitalcommons.uri.edu/context/gsofacpubs/article/1284/viewcontent/Macy_etal_EffectsZooplankton_1998.pdf |
genre |
Calanus finmarchicus Copepods |
genre_facet |
Calanus finmarchicus Copepods |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/217 doi:10.3354/meps172089 https://digitalcommons.uri.edu/context/gsofacpubs/article/1284/viewcontent/Macy_etal_EffectsZooplankton_1998.pdf |
op_doi |
https://doi.org/10.3354/meps172089 |
container_title |
Marine Ecology Progress Series |
container_volume |
172 |
container_start_page |
89 |
op_container_end_page |
100 |
_version_ |
1772813585641111552 |