Copepod production in the southern Benguela system
Several methods have been used to indirectly estimate copepod production in the southern Benguela region, based on field sampling of copepod stages and laboratory measurements of growth and development rates under variable food and temperature regimes. Estimates of production have steadily increased...
Gespeichert in:
| Veröffentlicht in: | ICES journal of marine science Jg. 52; H. 3-4; S. 439 - 455 |
|---|---|
| Hauptverfasser: | , , , , , |
| Format: | Journal Article Tagungsbericht |
| Sprache: | Englisch |
| Veröffentlicht: |
Oxford University Press
1995
|
| Schlagworte: | |
| ISSN: | 1054-3139, 1095-9289 |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Abstract | Several methods have been used to indirectly estimate copepod production in the southern Benguela region, based on field sampling of copepod stages and laboratory measurements of growth and development rates under variable food and temperature regimes. Estimates of production have steadily increased from 11 gC m−2 y−1 in 1979 to 80 gC m−2 y−1 in 1987. Since 1988, extensive measurements of copepod egg production and moulting rates of Calanus agulhensis at sea during hydro-acoustic fisheries surveys over the south and west coasts of South Africa in November have provided more direct estimates of copepod production. Daily Mean Production: Mean Biomass (P: B) ratios varied between 0.1 and 0.3 and annual production ranged between 17 and 150 gC m−2 y−1 Copepod biomass, distribution, and demographic structure varied between cruises in different years, apparently linked to both the abundance of predators and shifts in hydrology. Production appeared to be due more to shifts in distribution of biomass and demography of Calanus than to variations in growth rates. Poor correlations existed between juvenile growth and female egg production, suggesting one is unable to predict population growth from egg production rates only. Weak correlations between growth rates of different stages also suggest that the only meaningful measure of copepod production requires all stages to be incubated. |
|---|---|
| AbstractList | Several methods have been used to indirectly estimate copepod production in the southern Benguela region, based on field sampling of copepod stages and laboratory measurements of growth and development rates under variable food and temperature regimes. Estimates of production have steadily increased from 11 gC m super(-2) y super(-1) in 1979 to 80 gC m super(-2) y super(-1) in 1987. Since 1988, extensive measurements of copepod egg production and moulting rates of Calanus agulhensis at sea during hydro-acoustic fisheries surveys over the south and west coasts of South Africa to November have provided more direct estimates of copepod production. Daily Mean Production: Mean Biomass (P:B) ratios varied between 0.1 and 0.3 and annual production ranged between 17 and 150 gC m super(-2) y super(-1). Copepod biomass, distribution, and demographic structure varied between cruises in different years, apparently linked to both the abundance of predators and shifts in hydrology. Production appeared to be due more to shifts in distribution of biomass and demography of Calanus than to variations in growth rates. Poor correlations existed between juvenile growth and female egg production, suggesting one is unable to predict population growth from egg production rates only. Weak correlations between growth rates of different stages also suggest that the only meaningful measure of copepod production requires all stages to be incubated. Several methods have been used to indirectly estimate copepod production in the southern Benguela region, based on field sampling of copepod stages and laboratory measurements of growth and development rates under variable food and temperature regimes. Estimates of production have steadily increased from 11 gC m−2 y−1 in 1979 to 80 gC m−2 y−1 in 1987. Since 1988, extensive measurements of copepod egg production and moulting rates of Calanus agulhensis at sea during hydro-acoustic fisheries surveys over the south and west coasts of South Africa in November have provided more direct estimates of copepod production. Daily Mean Production: Mean Biomass (P: B) ratios varied between 0.1 and 0.3 and annual production ranged between 17 and 150 gC m−2 y−1 Copepod biomass, distribution, and demographic structure varied between cruises in different years, apparently linked to both the abundance of predators and shifts in hydrology. Production appeared to be due more to shifts in distribution of biomass and demography of Calanus than to variations in growth rates. Poor correlations existed between juvenile growth and female egg production, suggesting one is unable to predict population growth from egg production rates only. Weak correlations between growth rates of different stages also suggest that the only meaningful measure of copepod production requires all stages to be incubated. Several methods have been used to indirectly estimate copepod production in the southern Benguela region, based on field sampling of copepod stages and laboratory measurements of growth and development rates under variable food and temperature regime. Estimates of production have steadily increased from 11 gC m super(-2) y super(-1) 1979 to 80 gC m super(-2) y super(-1) in 1987. Since 1988 extensive measurements of copepod egg production and moulting rates of Calanus agulhensis at sea during hydro-acoustic fisheries surveys over the south and west coast of South Africa in November have provided more direct estimates of copepod production. Daily Mean Production: Mean Biomass (P:B) ratios varied between 0.1 and 0.3 and annual production raged between 17 and 150 gC m super(-2) y super(-1). Copepod biomass, distribution and demographic structure varied between cruises in different years, apparently linked to both the abundance of predators and shifts in hydrology. Production appeared to be due more to shifts in distribution of biomass and demography of Calanus than to variations in growth rates. Poor correlations existed between juvenile growth and female egg production, suggesting one is unable to predict population growth from egg production rates only. Weak correlations between growth rates of different stages also suggest that the only meaningful measure of copepod production requires all stages to be incubated. |
| Author | Verheye, H. M. Mitchell-Innes, B. A. Painting, S. J. Huggett, J. A. Hutchings, L. Peterson, W. T. |
| Author_xml | – sequence: 1 givenname: L. surname: Hutchings fullname: Hutchings, L. organization: Sea Fisheries Research Institute Pvt Bag X2, Roggebaai, Cape Town 8012, South Africa – sequence: 2 givenname: H. M. surname: Verheye fullname: Verheye, H. M. organization: Sea Fisheries Research Institute Pvt Bag X2, Roggebaai, Cape Town 8012, South Africa – sequence: 3 givenname: B. A. surname: Mitchell-Innes fullname: Mitchell-Innes, B. A. organization: Sea Fisheries Research Institute Pvt Bag X2, Roggebaai, Cape Town 8012, South Africa – sequence: 4 givenname: W. T. surname: Peterson fullname: Peterson, W. T. organization: NOAA-NMFS-F/RE3, 1335 East West Highway Silver Spring, MD 21801, USA – sequence: 5 givenname: J. A. surname: Huggett fullname: Huggett, J. A. organization: Sea Fisheries Research Institute Pvt Bag X2, Roggebaai, Cape Town 8012, South Africa – sequence: 6 givenname: S. J. surname: Painting fullname: Painting, S. J. organization: Sea Fisheries Research Institute Pvt Bag X2, Roggebaai, Cape Town 8012, South Africa |
| BookMark | eNqFkEFLwzAUgINMcJv-Aw89iR6qL2nSNt60qJMNZKBYdglpm2i1a2rSgvv3tm548LLTy-H7HnnfBI1qUyuETjFcYsDhFQZG_QAH_JyzixiAcT89QGMMnPmcxHw0vHfIEZo49wEAEQ1hjEhiGtWYwmusKbq8LU3tlbXXvivPma4ftvZuVf3WqUp6buNatT5Gh1pWTp3s5hS93N89JzN_8fTwmNws_JxS2vpMc6KLLA4JZnleaNCZokQCEKCUEA4ho7HGISlYRFkQENrTUVSQOKNxplkwRWfbvf3XvjrlWrEuXa6qStbKdE7gsL-PYLIfZDGPKIcevN6CuTXOWaVFXrZyuLm1sqwEBjH0FEMsMcQSnInfniLtZfpPbmy5lnazT_O3Wtm3-_5zpP0UYRRETMzSlViulvN0Tl7FIvgBcveI8A |
| CitedBy_id | crossref_primary_10_1007_s10872_005_0043_1 crossref_primary_10_1016_j_jembe_2007_11_002 crossref_primary_10_1016_j_icesjms_2004_10_002 crossref_primary_10_1016_S0399_1784_03_00014_8 crossref_primary_10_1016_j_pocean_2008_10_006 crossref_primary_10_1080_00359199709520618 crossref_primary_10_2989_1814232X_2012_689672 crossref_primary_10_1016_j_envdev_2015_07_011 crossref_primary_10_1016_j_jembe_2004_07_015 crossref_primary_10_1016_j_dsr2_2021_105015 crossref_primary_10_1016_j_csr_2016_07_018 crossref_primary_10_1093_plankt_fbu045 crossref_primary_10_1016_j_pocean_2009_07_048 crossref_primary_10_1016_j_jmarsys_2006_05_014 crossref_primary_10_1016_j_dsr2_2023_105265 crossref_primary_10_1007_s10152_007_0093_4 crossref_primary_10_1029_2019JC015948 crossref_primary_10_1023_A_1003173721751 crossref_primary_10_1016_j_dsr_2007_08_008 crossref_primary_10_1093_plankt_fbi102 |
| ContentType | Journal Article Conference Proceeding |
| DBID | BSCLL AAYXX CITATION 7TN F1W H95 L.G |
| DOI | 10.1016/1054-3139(95)80059-X |
| DatabaseName | Istex CrossRef Oceanic Abstracts ASFA: Aquatic Sciences and Fisheries Abstracts Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources Aquatic Science & Fisheries Abstracts (ASFA) Professional |
| DatabaseTitle | CrossRef Aquatic Science & Fisheries Abstracts (ASFA) Professional Oceanic Abstracts Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources ASFA: Aquatic Sciences and Fisheries Abstracts |
| DatabaseTitleList | Aquatic Science & Fisheries Abstracts (ASFA) Professional Aquatic Science & Fisheries Abstracts (ASFA) Professional |
| DeliveryMethod | fulltext_linktorsrc |
| Discipline | Agriculture Oceanography |
| EISSN | 1095-9289 |
| Editor | Harris, R |
| Editor_xml | – fullname: Harris, R |
| EndPage | 455 |
| ExternalDocumentID | 10_1016_1054_3139_95_80059_X ark_67375_HXZ_QZQKXK2W_L |
| Genre | Conference Book |
| GeographicLocations | PSW, South Africa PSW, South Atlantic, Benguela Current PSW, South Atlantic, Agulhas Bank |
| GeographicLocations_xml | – name: PSW, South Atlantic, Benguela Current – name: PSW, South Africa – name: PSW, South Atlantic, Agulhas Bank |
| GroupedDBID | --K -~X .2P .I3 0R~ 18M 1B1 1TH 29I 2WC 4.4 482 48X 5GY 5VS 5WA 6TJ 70D AAFWJ AAIMJ AAJKP AAJQQ AAMDB AAMVS AAOGV AAPQZ AAPXW AAUQX AAVAP AAVLN ABEJV ABEUO ABGNP ABIXL ABJNI ABNGD ABNKS ABPPZ ABPTD ABQLI ABSMQ ABWST ABWVN ABXVV ABZBJ ACGFS ACPQN ACRPL ACUFI ADBBV ADEYI ADEZT ADFTL ADGZP ADHKW ADHZD ADMUD ADNMO ADOCK ADPDF ADQBN ADRTK ADYVW ADZTZ ADZXQ AEGPL AEHUL AEJOX AEJTW AEKPW AEKSI AELWJ AEMDU AENEX AENZO AEPUE AETBJ AEWNT AFFZL AFIYH AFOFC AFPKN AFSHK AGINJ AGKEF AGKRT AGQPQ AGQXC AGSYK AHXPO AI. AIJHB AKHUL AKWXX ALMA_UNASSIGNED_HOLDINGS ALUQC AMNDL APIBT APWMN AQDSO ARIXL ASAOO ATDFG ATTQO AXUDD AYOIW BAYMD BEYMZ BHONS BQDIO BSCLL BSWAC C1A C45 CAG CDBKE COF CS3 CXTWN CZ4 DAKXR DFGAJ DILTD DU5 D~K E3Z EBS ECGQY EE~ EJD ELUNK F9B FEDTE FHSFR FLUFQ FOEOM FQBLK GAUVT GJXCC GROUPED_DOAJ H13 H5~ HAR HVGLF HW0 HZ~ IHE IOX J21 JXSIZ KAQDR KBUDW KOP KSI KSN LG5 M-Z MBTAY ML0 N9A NGC NLBLG NOMLY NQ- NU- NVLIB O9- OAWHX ODMLO OJQWA OK1 OOVWX OVD OVEED P2P PAFKI PB- PEELM Q1. Q5Y QBD RD5 ROL ROZ RPZ RUSNO RW1 RXO SEW TCN TEORI TLC TOX UHS VH1 W8F WOQ X7H XPP YAYTL YK3 YKOAZ YXANX ZMT ~91 AAYXX CITATION 7TN F1W H95 L.G |
| ID | FETCH-LOGICAL-c444t-5f92fdb86215ccdf0fbe42a00204422906548f162d57453324fdb77d28b48bf53 |
| ISICitedReferencesCount | 47 |
| ISICitedReferencesURI | http://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=Summon&SrcAuth=ProQuest&DestLinkType=CitingArticles&DestApp=WOS_CPL&KeyUT=10_1016_1054_3139_95_80059_X&url=https%3A%2F%2Fcvtisr.summon.serialssolutions.com%2F%23%21%2Fsearch%3Fho%3Df%26include.ft.matches%3Dt%26l%3Dnull%26q%3D |
| ISSN | 1054-3139 |
| IngestDate | Sun Nov 09 11:10:42 EST 2025 Thu Jul 10 20:00:32 EDT 2025 Sat Nov 29 06:12:37 EST 2025 Tue Nov 18 22:46:24 EST 2025 Sat Sep 20 11:01:52 EDT 2025 |
| IsPeerReviewed | true |
| IsScholarly | true |
| Issue | 3-4 |
| Language | English |
| LinkModel | OpenURL |
| MergedId | FETCHMERGED-LOGICAL-c444t-5f92fdb86215ccdf0fbe42a00204422906548f162d57453324fdb77d28b48bf53 |
| Notes | ark:/67375/HXZ-QZQKXK2W-L ArticleID:52.3-4.439 istex:4F1D22499A9D372D7F46AEFC3E886AE110D933CC SourceType-Books-1 ObjectType-Book-1 content type line 25 ObjectType-Conference-2 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| PQID | 15897490 |
| PQPubID | 23462 |
| PageCount | 17 |
| ParticipantIDs | proquest_miscellaneous_16095212 proquest_miscellaneous_15897490 crossref_citationtrail_10_1016_1054_3139_95_80059_X crossref_primary_10_1016_1054_3139_95_80059_X istex_primary_ark_67375_HXZ_QZQKXK2W_L |
| PublicationCentury | 1900 |
| PublicationDate | 1995-00-00 |
| PublicationDateYYYYMMDD | 1995-01-01 |
| PublicationDate_xml | – year: 1995 text: 1995-00-00 |
| PublicationDecade | 1990 |
| PublicationTitle | ICES journal of marine science |
| PublicationYear | 1995 |
| Publisher | Oxford University Press |
| Publisher_xml | – name: Oxford University Press |
| SSID | ssj0007460 |
| Score | 1.6123887 |
| Snippet | Several methods have been used to indirectly estimate copepod production in the southern Benguela region, based on field sampling of copepod stages and... |
| SourceID | proquest crossref istex |
| SourceType | Aggregation Database Enrichment Source Index Database Publisher |
| StartPage | 439 |
| SubjectTerms | Agulhas Bank Calanus Calanus agulhensis Copepoda copepods inter-annual variation Marine production upwelling |
| Title | Copepod production in the southern Benguela system |
| URI | https://api.istex.fr/ark:/67375/HXZ-QZQKXK2W-L/fulltext.pdf https://www.proquest.com/docview/15897490 https://www.proquest.com/docview/16095212 |
| Volume | 52 |
| WOSCitedRecordID | wos10_1016_1054_3139_95_80059_X&url=https%3A%2F%2Fcvtisr.summon.serialssolutions.com%2F%23%21%2Fsearch%3Fho%3Df%26include.ft.matches%3Dt%26l%3Dnull%26q%3D |
| hasFullText | 1 |
| inHoldings | 1 |
| isFullTextHit | |
| isPrint | |
| journalDatabaseRights | – providerCode: PRVASL databaseName: Oxford Journals Open Access Collection customDbUrl: eissn: 1095-9289 dateEnd: 99991231 omitProxy: false ssIdentifier: ssj0007460 issn: 1054-3139 databaseCode: TOX dateStart: 19920201 isFulltext: true titleUrlDefault: https://academic.oup.com/journals/ providerName: Oxford University Press |
| link | http://cvtisr.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwtV3db9MwELdg4wF4gTFE-cwDTKDJ2pLa-XiEqlOnlXYTHYv2YuXDHhXDLUmKyn_P2bGToCImHniJKst1pLvL3dm-3-8Qek3DIOhDaovz1A8x8YnAKeEUpy6F7DwXWaJR_J_HwWQSxnF0asrGSt1OIJAyXK-j5X9VNYyBshV09h_U3SwKA_AblA5PUDs8NxX_x_hzPBh-6lJCfEsUxG_fBLuukQwWS0jAFVOA5n3t1D2WC136Lvc_cHm14teJ4XxuzaDSVZhli1xQbbt48YX_1Geko_ac9eO80vWm-FiaxgDt6YCuDzaorwtTsZ0bVB7tHELUfhMyP3DnNS-RdazU6xiQBfPUfpKYmXXIJTVT74Y3twcLZm1IuSP6xotChZjFcRvB7K39ZMqOzsdjNhvGs73ld6x6i6k7eNNo5Tba9vp-qLbos2ncxOuA1Fhy-xoLsHT9g2bsbUTfmdf-lsBsq29xvRHHdXIye4B2W9imc9oYxEN0i8sddO_9VWH4VfgOuj_NeCINTfkj5BkDcFoDcObSAc071gAcawBObQC76PxoOBuMsOmigTNCSIWpiDyRp7BzdWmW5eJQpJx4iUZFE832D5tW4fpeTgMCyb9HYHYQ5F6YkjAVtP8YbcmF5E-QkyYCxEdFIlxBaAapZgJLUVctreoDe6hvRcMyQzGvOp1cM1tLqATKlEBZRJkWKIt7CDf_WtYUKzfM39NSbyYnxVdVnhhQNoov2dnl2Ul84l2wcQ-9smph4DTVTVgi-WJVMpeGsI-ODv8yQxExQlr39MY1nqG77RfxHG1VxYq_QHeyH9W8LF5qU_sF73qR_g |
| linkProvider | Oxford University Press |
| openUrl | ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=proceeding&rft.title=ICES+journal+of+marine+science&rft.atitle=Copepod+production+in+the+southern+Benguela+system&rft.au=Hutchings%2C+L&rft.au=Verheye%2C+H+M&rft.au=Mitchell-Innes%2C+BA&rft.au=Peterson%2C+W+T&rft.date=1995-01-01&rft.issn=1054-3139&rft.volume=52&rft.issue=3-4&rft.spage=439&rft.epage=455&rft_id=info:doi/10.1016%2F1054-3139%2895%2980059-X&rft.externalDBID=NO_FULL_TEXT |
| thumbnail_l | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/lc.gif&issn=1054-3139&client=summon |
| thumbnail_m | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/mc.gif&issn=1054-3139&client=summon |
| thumbnail_s | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/sc.gif&issn=1054-3139&client=summon |