Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997
We present here strong evidence that production rates of the copepod Calanus finmarchicus were limited by the lack of food on the southern flank of Georges Bank during April 1997. Indices of production include size, condition, RNA/DNA ratio, and the rates of molting, growth, and egg production of C....
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@URI
2001
|
Subjects: | |
Online Access: | https://digitalcommons.uri.edu/gsofacpubs/1273 https://doi.org/10.1016/S0967-0645(00)00089-8 |
id |
ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2242 |
---|---|
record_format |
openpolar |
spelling |
ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2242 2023-12-03T10:20:39+01:00 Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997 Campbell, R. G. Runge, J. A. Durbin, E. G. 2001-01-17T08:00:00Z https://digitalcommons.uri.edu/gsofacpubs/1273 https://doi.org/10.1016/S0967-0645(00)00089-8 unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/1273 doi:10.1016/S0967-0645(00)00089-8 https://doi.org/10.1016/S0967-0645(00)00089-8 Graduate School of Oceanography Faculty Publications text 2001 ftunivrhodeislan https://doi.org/10.1016/S0967-0645(00)00089-8 2023-11-06T19:10:02Z We present here strong evidence that production rates of the copepod Calanus finmarchicus were limited by the lack of food on the southern flank of Georges Bank during April 1997. Indices of production include size, condition, RNA/DNA ratio, and the rates of molting, growth, and egg production of C. finmarchicus. Observations were made at a site in well-mixed water north of the tidal mixing front in a region of higher chlorophyll; a drifter site, occupied for 7 days, which was located in stratified water south of the front where chlorophyll concentrations were very low; and at several stations along an initial survey grid in the same region. At the drifter site, measurements of size, condition, molting rate, and egg production rate declined over time, and growth rates were enhanced when ambient water was enriched with mixed phytoplankton cultures. RNA/DNA ratios, molting rates, and growth rates were much lower than laboratory measurements at high food at the same temperatures, and egg production rates were lower than predicted under non-limiting conditions. The effects of food limitation were more severe in naupliar and early copepodite stages. In comparison, in the higher chlorophyll region, younger copepodites were larger and in better condition, and RNA/DNA ratios and egg production rates were higher and near maximum predicted values. We evaluate these results with respect to the question of food limitation on the bank and explore the implications for understanding variability in C. finmarchicus abundance and its potential role in the trophodynamics of fish larvae. © 2000 Elsevier Science Ltd. Text Calanus finmarchicus University of Rhode Island: DigitalCommons@URI Deep Sea Research Part II: Topical Studies in Oceanography 48 1-3 531 549 |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
description |
We present here strong evidence that production rates of the copepod Calanus finmarchicus were limited by the lack of food on the southern flank of Georges Bank during April 1997. Indices of production include size, condition, RNA/DNA ratio, and the rates of molting, growth, and egg production of C. finmarchicus. Observations were made at a site in well-mixed water north of the tidal mixing front in a region of higher chlorophyll; a drifter site, occupied for 7 days, which was located in stratified water south of the front where chlorophyll concentrations were very low; and at several stations along an initial survey grid in the same region. At the drifter site, measurements of size, condition, molting rate, and egg production rate declined over time, and growth rates were enhanced when ambient water was enriched with mixed phytoplankton cultures. RNA/DNA ratios, molting rates, and growth rates were much lower than laboratory measurements at high food at the same temperatures, and egg production rates were lower than predicted under non-limiting conditions. The effects of food limitation were more severe in naupliar and early copepodite stages. In comparison, in the higher chlorophyll region, younger copepodites were larger and in better condition, and RNA/DNA ratios and egg production rates were higher and near maximum predicted values. We evaluate these results with respect to the question of food limitation on the bank and explore the implications for understanding variability in C. finmarchicus abundance and its potential role in the trophodynamics of fish larvae. © 2000 Elsevier Science Ltd. |
format |
Text |
author |
Campbell, R. G. Runge, J. A. Durbin, E. G. |
spellingShingle |
Campbell, R. G. Runge, J. A. Durbin, E. G. Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997 |
author_facet |
Campbell, R. G. Runge, J. A. Durbin, E. G. |
author_sort |
Campbell, R. G. |
title |
Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997 |
title_short |
Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997 |
title_full |
Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997 |
title_fullStr |
Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997 |
title_full_unstemmed |
Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997 |
title_sort |
evidence for food limitation of calanus finmarchicus production rates on the southern flank of georges bank during april 1997 |
publisher |
DigitalCommons@URI |
publishDate |
2001 |
url |
https://digitalcommons.uri.edu/gsofacpubs/1273 https://doi.org/10.1016/S0967-0645(00)00089-8 |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/1273 doi:10.1016/S0967-0645(00)00089-8 https://doi.org/10.1016/S0967-0645(00)00089-8 |
op_doi |
https://doi.org/10.1016/S0967-0645(00)00089-8 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
48 |
container_issue |
1-3 |
container_start_page |
531 |
op_container_end_page |
549 |
_version_ |
1784268103768604672 |