Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999
We present here a synthesis of observations of egg production rates (EP) of the planktonic copepod, Calanus finmarchicus, carried out during process cruises of the US GLOBEC Northwest Atlantic/Georges Bank program between January and June 1995, 1997 and 1999. Female C. finmarchicus produced eggs at...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
---|---|
Main Authors: | , , , , |
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@URI
2006
|
Subjects: | |
Online Access: | https://digitalcommons.uri.edu/gsofacpubs/1255 https://doi.org/10.1016/j.dsr2.2006.08.010 |
id |
ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2224 |
---|---|
record_format |
openpolar |
spelling |
ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2224 2023-12-03T10:20:39+01:00 Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999 Runge, J. A. Plourde, S. Joly, P. Niehoff, B. Durbin, E. 2006-11-01T08:00:00Z https://digitalcommons.uri.edu/gsofacpubs/1255 https://doi.org/10.1016/j.dsr2.2006.08.010 unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/1255 doi:10.1016/j.dsr2.2006.08.010 https://doi.org/10.1016/j.dsr2.2006.08.010 Graduate School of Oceanography Faculty Publications Calanus Copepod Egg production Georges Bank Reproduction Zooplankton text 2006 ftunivrhodeislan https://doi.org/10.1016/j.dsr2.2006.08.010 2023-11-06T19:10:02Z We present here a synthesis of observations of egg production rates (EP) of the planktonic copepod, Calanus finmarchicus, carried out during process cruises of the US GLOBEC Northwest Atlantic/Georges Bank program between January and June 1995, 1997 and 1999. Female C. finmarchicus produced eggs at relatively high rates in at least some regions of Georges Bank during all months between January and June. Median, monthly EP varied between 24 eggs female-1 d-1 in January to 50 eggs female-1 d-1 in April-June; the highest mean EP was 86 eggs female-1 d-1. Mean egg diameter was negatively related to ambient mean water-column temperature (0-100 m or bottom), decreasing from 149 to 142 μm between January and June. Direct measurements of body C or N or prosome length-mass relationships were used to determine mass-specific egg production rates. The relationships between estimates of chlorophyll a standing stock (mg chl. a m-2) and both C- and N-specific rates (% d-1) are reasonably well (r2 = 0.42) described by Ivlev curves. It is likely that chlorophyll standing stock serves as a proxy of both phytoplankton and microzooplankton food concentrations available to adult females. Chlorophyll standing stocks were below the critical concentration (at which EP is 95% of the calculated maximum) at approximately 55% of stations occupied over the study period, indicating frequent food limitation to varying extent. There were periods (e.g., over at least 6 d in April, 1997 on the southern flank) during which food limitation was severe. There was no detectable influence of mean water-column temperature on mass-specific EP. Hatching success varied between 50% and 95% without any seasonal trend. Our qualitative observations suggest the possibility that a significant proportion of hatching nauplii incubations were non-viable, meriting further study. © 2006 Elsevier Ltd. All rights reserved. Text Calanus finmarchicus Northwest Atlantic University of Rhode Island: DigitalCommons@URI Ivlev ENVELOPE(156.303,156.303,52.975,52.975) Deep Sea Research Part II: Topical Studies in Oceanography 53 23-24 2618 2631 |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
topic |
Calanus Copepod Egg production Georges Bank Reproduction Zooplankton |
spellingShingle |
Calanus Copepod Egg production Georges Bank Reproduction Zooplankton Runge, J. A. Plourde, S. Joly, P. Niehoff, B. Durbin, E. Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999 |
topic_facet |
Calanus Copepod Egg production Georges Bank Reproduction Zooplankton |
description |
We present here a synthesis of observations of egg production rates (EP) of the planktonic copepod, Calanus finmarchicus, carried out during process cruises of the US GLOBEC Northwest Atlantic/Georges Bank program between January and June 1995, 1997 and 1999. Female C. finmarchicus produced eggs at relatively high rates in at least some regions of Georges Bank during all months between January and June. Median, monthly EP varied between 24 eggs female-1 d-1 in January to 50 eggs female-1 d-1 in April-June; the highest mean EP was 86 eggs female-1 d-1. Mean egg diameter was negatively related to ambient mean water-column temperature (0-100 m or bottom), decreasing from 149 to 142 μm between January and June. Direct measurements of body C or N or prosome length-mass relationships were used to determine mass-specific egg production rates. The relationships between estimates of chlorophyll a standing stock (mg chl. a m-2) and both C- and N-specific rates (% d-1) are reasonably well (r2 = 0.42) described by Ivlev curves. It is likely that chlorophyll standing stock serves as a proxy of both phytoplankton and microzooplankton food concentrations available to adult females. Chlorophyll standing stocks were below the critical concentration (at which EP is 95% of the calculated maximum) at approximately 55% of stations occupied over the study period, indicating frequent food limitation to varying extent. There were periods (e.g., over at least 6 d in April, 1997 on the southern flank) during which food limitation was severe. There was no detectable influence of mean water-column temperature on mass-specific EP. Hatching success varied between 50% and 95% without any seasonal trend. Our qualitative observations suggest the possibility that a significant proportion of hatching nauplii incubations were non-viable, meriting further study. © 2006 Elsevier Ltd. All rights reserved. |
format |
Text |
author |
Runge, J. A. Plourde, S. Joly, P. Niehoff, B. Durbin, E. |
author_facet |
Runge, J. A. Plourde, S. Joly, P. Niehoff, B. Durbin, E. |
author_sort |
Runge, J. A. |
title |
Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999 |
title_short |
Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999 |
title_full |
Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999 |
title_fullStr |
Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999 |
title_full_unstemmed |
Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994-1999 |
title_sort |
characteristics of egg production of the planktonic copepod, calanus finmarchicus, on georges bank: 1994-1999 |
publisher |
DigitalCommons@URI |
publishDate |
2006 |
url |
https://digitalcommons.uri.edu/gsofacpubs/1255 https://doi.org/10.1016/j.dsr2.2006.08.010 |
long_lat |
ENVELOPE(156.303,156.303,52.975,52.975) |
geographic |
Ivlev |
geographic_facet |
Ivlev |
genre |
Calanus finmarchicus Northwest Atlantic |
genre_facet |
Calanus finmarchicus Northwest Atlantic |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/1255 doi:10.1016/j.dsr2.2006.08.010 https://doi.org/10.1016/j.dsr2.2006.08.010 |
op_doi |
https://doi.org/10.1016/j.dsr2.2006.08.010 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
53 |
container_issue |
23-24 |
container_start_page |
2618 |
op_container_end_page |
2631 |
_version_ |
1784268109478100992 |