Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations
Abstract Despite ecological importance, the feeding ecology of the large calanoid copepod, Neocalanus cristatus is little known, as its ingestion rate under experimental conditions consistently falls short of its metabolic demand. The conventional incubation bottle size (~ 2 liters) used in previous...
Published in: | Limnology and Oceanography |
---|---|
Main Authors: | , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2023
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/lno.12310 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12310 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12310 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12310 |
id |
crwiley:10.1002/lno.12310 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/lno.12310 2024-09-15T18:37:57+00:00 Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations Takahashi, Kazutaka Ichinomiya, Mutsuo Okazaki, Yuji Nishibe, Yuichiro Ministry of Education, Culture, Sports, Science and Technology 2023 http://dx.doi.org/10.1002/lno.12310 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12310 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12310 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12310 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 68, issue 4, page 790-802 ISSN 0024-3590 1939-5590 journal-article 2023 crwiley https://doi.org/10.1002/lno.12310 2024-08-30T04:09:14Z Abstract Despite ecological importance, the feeding ecology of the large calanoid copepod, Neocalanus cristatus is little known, as its ingestion rate under experimental conditions consistently falls short of its metabolic demand. The conventional incubation bottle size (~ 2 liters) used in previous studies may have affected its feeding behavior. Here, we examined the effect of bottle size (2.4 vs. 13liters) and copepod density on the feeding of N. cristatus Stage C5. Under similar copepod density (0.4 ind. L −1 ) ingestion rates decreased significantly for tests conducted in small bottles and thus, small bottles inhibited copepod feeding. In experiments with large bottles, ingestion rates were highest in the single‐individual treatments (1 ind. 13 L −1 ), decreasing exponentially to < 1% of the maximum ingestion rate with increasing copepod densities (up to 20 ind. 13 L −1 ). Considerable food limitation occurred in the higher copepod density treatments with lower initial prey allocation per individual. Moreover, in the single‐individual treatments, clearance rates on naked ciliates (11–20 L ind. −1 d −1 ) were remarkably higher than in multiple‐individual treatments. Grazer–grazer interaction, thus, interfered with copepod feeding on microzooplankton in multiple‐individual treatments. The ingestion rate in the single‐individual treatments (62–102 μ gC ind. −1 d −1 ) exceeded the daily metabolic requirement; feeding rates noted in previous studies were, thus, underestimations, affected by bottle size and copepod mutual interference. Efficient feeding by N. cristatus on naked ciliates emphasizes the importance of the ciliate‐copepod link in the grazing food chain in the subarctic Pacific. Article in Journal/Newspaper Subarctic Wiley Online Library Limnology and Oceanography 68 4 790 802 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Despite ecological importance, the feeding ecology of the large calanoid copepod, Neocalanus cristatus is little known, as its ingestion rate under experimental conditions consistently falls short of its metabolic demand. The conventional incubation bottle size (~ 2 liters) used in previous studies may have affected its feeding behavior. Here, we examined the effect of bottle size (2.4 vs. 13liters) and copepod density on the feeding of N. cristatus Stage C5. Under similar copepod density (0.4 ind. L −1 ) ingestion rates decreased significantly for tests conducted in small bottles and thus, small bottles inhibited copepod feeding. In experiments with large bottles, ingestion rates were highest in the single‐individual treatments (1 ind. 13 L −1 ), decreasing exponentially to < 1% of the maximum ingestion rate with increasing copepod densities (up to 20 ind. 13 L −1 ). Considerable food limitation occurred in the higher copepod density treatments with lower initial prey allocation per individual. Moreover, in the single‐individual treatments, clearance rates on naked ciliates (11–20 L ind. −1 d −1 ) were remarkably higher than in multiple‐individual treatments. Grazer–grazer interaction, thus, interfered with copepod feeding on microzooplankton in multiple‐individual treatments. The ingestion rate in the single‐individual treatments (62–102 μ gC ind. −1 d −1 ) exceeded the daily metabolic requirement; feeding rates noted in previous studies were, thus, underestimations, affected by bottle size and copepod mutual interference. Efficient feeding by N. cristatus on naked ciliates emphasizes the importance of the ciliate‐copepod link in the grazing food chain in the subarctic Pacific. |
author2 |
Ministry of Education, Culture, Sports, Science and Technology |
format |
Article in Journal/Newspaper |
author |
Takahashi, Kazutaka Ichinomiya, Mutsuo Okazaki, Yuji Nishibe, Yuichiro |
spellingShingle |
Takahashi, Kazutaka Ichinomiya, Mutsuo Okazaki, Yuji Nishibe, Yuichiro Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations |
author_facet |
Takahashi, Kazutaka Ichinomiya, Mutsuo Okazaki, Yuji Nishibe, Yuichiro |
author_sort |
Takahashi, Kazutaka |
title |
Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations |
title_short |
Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations |
title_full |
Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations |
title_fullStr |
Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations |
title_full_unstemmed |
Higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations |
title_sort |
higher ingestion rates and importance of ciliates in the diet of a large, subarctic copepod revealed by larger volume incubations |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/lno.12310 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12310 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12310 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12310 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Limnology and Oceanography volume 68, issue 4, page 790-802 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12310 |
container_title |
Limnology and Oceanography |
container_volume |
68 |
container_issue |
4 |
container_start_page |
790 |
op_container_end_page |
802 |
_version_ |
1810482294208593920 |