GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • PANGAEA  (27)
  • Copernicus Publications (EGU)  (1)
Document type
Keywords
Publisher
Years
  • 1
    Publication Date: 2024-02-07
    Description: The Humboldt Current Upwelling System (HCS) is the most productive eastern boundary upwelling system (EBUS) in terms of fishery yield on the planet. EBUSs are considered hotspots of climate change with predicted expansion of mesopelagic oxygen minimum zones (OMZs) and related changes in the frequency and intensity of upwelling of nutrient-rich, low-oxygen deep water. To increase our mechanistic understanding of how upwelling impacts plankton communities and trophic links, we investigated mesozooplankton community succession and gut fluorescence, fatty acid and elemental compositions (C, N, O, P), and stable isotope (δ13C, δ15N) ratios of dominant mesozooplankton and microzooplankton representatives in a mesocosm setup off Callao (Peru) after simulated upwelling with OMZ water from two different locations and different N:P signatures (moderate and extreme treatments). An oxycline between 5 and 15 m with hypoxic conditions (〈50 µmol L−1) below ∼10 m persisted in the mesocosms throughout the experiment. No treatment effects were determined for the measured parameters, but differences in nutrient concentrations established through OMZ water additions were only minor. Copepods and polychaete larvae dominated in terms of abundance and biomass. Development and reproduction of the dominant copepod genera Paracalanus sp., Hemicyclops sp., Acartia sp., and Oncaea sp. were hindered as evident from accumulation of adult copepodids but largely missing nauplii. Failed hatching of nauplii in the hypoxic bottom layer of the mesocosms and poor nutritional condition of copepods suggested from very low gut fluorescence and fatty acid compositions most likely explain the retarded copepod development. Correlation analysis revealed no particular trophic relations between dominant copepods and phytoplankton groups. Possibly, particulate organic matter with a relatively high C:N ratio was a major diet of copepods. C:N ratios of copepods and polychaetes ranged 4.8–5.8 and 4.2–4.3, respectively. δ15N was comparatively high (∼13 ‰–17 ‰), potentially because the injected OMZ source water was enriched in δ15N as a result of anoxic conditions. Elemental ratios of dinoflagellates deviated strongly from the Redfield ratio. We conclude that opportunistic feeding of copepods may have played an important role in the pelagic food web. Overall, projected changes in the frequency and intensity of upwelling hypoxic waters may make a huge difference for copepod reproduction and may be further enhanced by varying N:P ratios of upwelled OMZ water masses.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2024-03-09
    Description: Increasing upwelling intensity and shoaling of the oxygen minimum zone (OMZ) is projected for Eastern Boundary Upwelling Systems (EBUSs) under ocean warming which may have severe consequences for mesopelagic food webs, trophic transfer, and fish production also in the Humboldt Current Upwelling System (HUS). To improve our mechanistic understanding, from February 23, 2017 until April 14, 2017 we performed a 50 days mesocosm experiment in the northern HUS (off Callao Bay, Peru) and monitored the zooplankton development prior to and following a simulated upwelling event through the addition of deeper water of two different OMZ-influenced subsurface waters to four of in total eight mesocosms. To elucidate plankton dynamics and trophic relationships, we followed the temporal development of the mesozooplankton community in relation to that of phytoplankton, analyzed the fatty acid composition and gut fluorescence of dominant copepods, and determined the stable isotope (SI) and elemental composition (C:N) of dominant zooplankton taxa. Zooplankton samples were collected from the mesocosms over the entire experiment duration using an Apstein net (17 cm diameter, 100 µm mesh) to determine abundance and taxonomic composition of the zooplankton community, and to analyze fatty acid composition, gut fluorescence and elemental composition of dominant zooplankton. Furthermore, abundance and biomass of zooplankton groups was estimated from scanned ZooScan images.
    Keywords: Abundance; Biomass; Climate - Biogeochemistry Interactions in the Tropical Ocean; Coastal Upwelling System in a Changing Ocean; CUSCO; Gut fluorescence; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Oxygen Minimun zone; SFB754; Stable isotopes; Zooplankton
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2024-03-09
    Description: Abundance and biomass data of the copepod Calanus chilensis were derived from vertical Multinet hauls with a mesh size of 200 µm. C. chilensis was sampled in December 2018/January 2019 (Maria S. Merian, MSM80) in the northern Humboldt Current System from 8.5°S to 16°S. Several transects from neritic to offshore (up to 200 km from coast) stations were analysed. Maximum sampling depth was either close to the seafloor (neritic and shelf break stations) or 1000 m for the oceanic stations. At one station during the MSM80 cruise sampling was carried out to 2000 m. Species and stages were identified and enumerated separately. Adult females, males and copepodite stage 5 (C5) and 4 (C4) were included in the abundance/biomass calculations. Abundance is expressed as number of individuals per m**3 and per m**2 and biomass as mg dry mass (DM) per m**2.
    Keywords: Calanus chilensis; Calanus chilensis, biomass, dry mass; Calanus chilensis, copepodites; Calanus chilensis, female; Calanus chilensis, male; Coastal Upwelling System in a Changing Ocean; copepods; CUSCO; CUSCO-1; DATE/TIME; Depth, bathymetric; Depth, bottom/max; Depth, top/min; Event label; LATITUDE; LONGITUDE; Maria S. Merian; MSM80; MSM80_102-4; MSM80_10-4; MSM80_104-6; MSM80_13-4; MSM80_14-4; MSM80_1-6; MSM80_18-4; MSM80_20-4; MSM80_22-4; MSM80_25-4; MSM80_28-4; MSM80_30-4; MSM80_38-5; MSM80_40-5; MSM80_43-5; MSM80_45-5; MSM80_4-6; MSM80_46-11; MSM80_46-15; MSM80_46-20; MSM80_46-6; MSM80_53-4; MSM80_56-5; MSM80_58-4; MSM80_60-4; MSM80_63-4; MSM80_65-5; MSM80_66-4; MSM80_67-4; MSM80_68-5; MSM80_7-4; MSM80_74-4; MSM80_78-4; MSM80_80-10; MSM80_80-13; MSM80_80-17; MSM80_80-6; MSM80_89-4; MSM80_90-4; MSM80_94-5; MSM80_95-4; MSM80_96-4; MSM80_99-6; MSN; Multiple opening/closing net; upwelling systems; vertical distribution
    Type: Dataset
    Format: text/tab-separated-values, 1565 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2024-03-09
    Keywords: ANT-XXIX/1; Canarias Sea; Carbon, total; Carbon/Nitrogen ratio; Date/Time of event; Depth, bottom/max; Depth, top/min; Dry mass per individual; Elevation of event; Event label; Latitude of event; Lipid corrected d13C/12C for crustaceans; Longitude of event; MSN; Multiple opening/closing net; Nitrogen, total; Number of individuals; Polarstern; PS81; PS81/001-3; PS81/002-3; PS81/004-4; PS81/005-6; PS81/007-2; PS81/008-6; PS81/009-4; PS81/010-3; PS81/011-4; PS81/012-4; PS81/013-6; PS81/014-4; PS81/015-2; PS81/016-4; PS81/017-7; South Atlantic Ocean; Species; Stage; Station label; δ13C/12C ratio; δ15N/14N ratio
    Type: Dataset
    Format: text/tab-separated-values, 4432 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 2024-03-09
    Keywords: ANT-XXIX/1; calanoid copepods; Life stage; MSN; Multiple opening/closing net; Number of specimens; Polarstern; Prosome, length; Prosome length, standard deviation; PS81; PS81/015-2; PS81/016-4; South Atlantic Ocean; Species; subtropical area; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 1071 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2024-03-09
    Description: Biomass of zooplankton taxa in µg DM per liter as determined by ZooScan, using published area to dry weight relationships (Lehette & Hernandez-Leon 2009). Each data point is one sampling day (date) in one mesocosm (MK). For details on experimental treatments and sampling, refer to Bach et al. 2021 (https://doi.org/10.5194/bg-17-4831-2020) and Ayon et al. 2022 (https://doi.org/10.5194/bg-2022-157). Raw images are stored in https://ecotaxa.obs-vlfr.fr/prj/3784. All taxonomic categories are self-expanatory.
    Keywords: Abundance; Acartia spp., biomass, dry mass; Biomass; Bivalvia, biomass, dry mass; Branchiostoma spp., biomass, dry mass; Calanoida, biomass, dry mass; Ceratium spp., biomass, dry mass; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cnidaria, biomass, dry mass; Coastal Upwelling System in a Changing Ocean; Copepoda, biomass, dry mass; Copepoda, nauplii, biomass, dry mass; Corycaeidae, biomass, dry mass; Crustacea, larvae, biomass, dry mass; CUSCO; Cyclopoida, biomass, dry mass; DATE/TIME; Diatoms, centrales, biomass, dry mass; Gastropoda, biomass, dry mass; Gut fluorescence; Harpacticoida, biomass, dry mass; Hemicyclops spp., biomass, dry mass; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Mesocosm label; Noctilucales, biomass, dry mass; Oncaeidae, biomass, dry mass; Oxygen Minimun zone; Paracalanus spp., biomass, dry mass; Polychaeta, biomass, dry mass; Sample code/label; Sample volume; SFB754; Spionidae, biomass, dry mass; Stable isotopes; Tintinnida, biomass, dry mass; Zooplankton; Zooplankton, biomass, dry mass
    Type: Dataset
    Format: text/tab-separated-values, 2430 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Publication Date: 2024-03-09
    Description: Zooplankton species/groups abundance table per mesocosm and sampling day. Abundances are given as individual per m-3 and individuals per liter.
    Keywords: Abundance; Abundance per volume; Biomass; Class; Climate - Biogeochemistry Interactions in the Tropical Ocean; Coastal Upwelling System in a Changing Ocean; CUSCO; DATE/TIME; Day of experiment; Gut fluorescence; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Life stage; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Mesocosm label; Order; Oxygen Minimun zone; SFB754; Species; Stable isotopes; Treatment; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 15477 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Publication Date: 2024-03-09
    Keywords: Acartia spp., c1-c3; Acartia spp., c4-c5; Acartia spp., female; Acartia spp., male; Aetidaeidae, c1-c3; Aetidaeidae, c4-c5; Aetidaeidae, female; Aetidaeidae, male; Aetidaeus arcuatus, c1-c3; Aetidaeus arcuatus, c4-c5; Aetidaeus arcuatus, female; Aetidaeus arcuatus, male; Aetidaeus armatus, c1-c3; Aetidaeus armatus, c4-c5; Aetidaeus armatus, female; Aetidaeus armatus, male; Aetidaeus australis, c1-c3; Aetidaeus australis, c4-c5; Aetidaeus australis, female; Aetidaeus australis, male; Aetidaeus giesbrechti, c1-c3; Aetidaeus giesbrechti, c4-c5; Aetidaeus giesbrechti, female; Aetidaeus giesbrechti, male; Aetidaeus spp., c1-c3; Aetidaeus spp., c4-c5; Aetidaeus spp., female; Aetidaeus spp., male; Aetideopsis carinata, c1-c3; Aetideopsis carinata, c4-c5; Aetideopsis carinata, female; Aetideopsis carinata, male; Aetideopsis spp., c1-c3; Aetideopsis spp., c4-c5; Aetideopsis spp., female; Aetideopsis spp., male; Amallothrix spp., c1-c3; Amallothrix spp., c4-c5; Amallothrix spp., female; Amallothrix spp., male; ANT-XXIX/1; Augaptilidae, c1-c3; Augaptilidae, c4-c5; Augaptilidae, female; Augaptilidae, male; Augaptilus anceps, c1-c3; Augaptilus anceps, c4-c5; Augaptilus anceps, female; Augaptilus anceps, male; Augaptilus longicaudatus, c1-c3; Augaptilus longicaudatus, c4-c5; Augaptilus longicaudatus, female; Augaptilus longicaudatus, male; Augaptilus megalurus, c1-c3; Augaptilus megalurus, c4-c5; Augaptilus megalurus, female; Augaptilus megalurus, male; Augaptilus spinifrons, c1-c3; Augaptilus spinifrons, c4-c5; Augaptilus spinifrons, female; Augaptilus spinifrons, male; Augaptilus spp., c1-c3; Augaptilus spp., c4-c5; Augaptilus spp., female; Augaptilus spp., male; Calanidae, c1-c3; Calanidae, c4-c5; Calanidae, female; Calanidae, male; Calanoides natalis, c1-c3; Calanoides natalis, c4-c5; Calanoides natalis, female; Calanoides natalis, male; Calocalanus spp., c1-c3; Calocalanus spp., c4-c5; Calocalanus spp., female; Calocalanus spp., male; Candacia bipinnata, c1-c3; Candacia bipinnata, c4-c5; Candacia bipinnata, female; Candacia bipinnata, male; Candacia curta, c1-c3; Candacia curta, c4-c5; Candacia curta, female; Candacia curta, male; Candacia elongata, c1-c3; Candacia elongata, c4-c5; Candacia elongata, female; Candacia elongata, male; Candacia ethiopica, c1-c3; Candacia ethiopica, c4-c5; Candacia ethiopica, female; Candacia ethiopica, male; Candacia longimana, c1-c3; Candacia longimana, c4-c5; Candacia longimana, female; Candacia longimana, male; Candacia spp., c1-c3; Candacia spp., c4-c5; Candacia spp., female; Candacia spp., male; Centropages bradyi, c1-c3; Centropages bradyi, c4-c5; Centropages bradyi, female; Centropages bradyi, male; Cephalophanes spp., c1-c3; Cephalophanes spp., c4-c5; Cephalophanes spp., female; Cephalophanes spp., male; Clausocalanus spp., c1-c3; Clausocalanus spp., c4-c5; Clausocalanus spp., female; Clausocalanus spp., male; Comment; Copepoda; Ctenocalanus spp., c1-c3; Ctenocalanus spp., c4-c5; Ctenocalanus spp., female; Ctenocalanus spp., male; Delibus spp., c1-c3; Delibus spp., c4-c5; Delibus spp., female; Delibus spp., male; Depth, bottom/max; Depth, top/min; DEPTH, water; Disco spp., c1-c3; Disco spp., c4-c5; Disco spp., female; Disco spp., male; Euaugaptilus spp., c1-c3; Euaugaptilus spp., c4-c5; Euaugaptilus spp., female; Euaugaptilus spp., male; Eucalanus hyalinus, c1-c3; Eucalanus hyalinus, c4-c5; Eucalanus hyalinus, female; Eucalanus hyalinus, male; Euchaeta marina, c1-c3; Euchaeta marina, c4-c5; Euchaeta marina, female; Euchaeta marina, male; Euchaeta spp., c1-c3; Euchaeta spp., c4-c5; Euchaeta spp., female; Euchaeta spp., male; Euchaetidae, c1-c3; Euchaetidae, c4-c5; Euchaetidae, female; Euchaetidae, male; Euchirella pulchra, c1-c3; Euchirella pulchra, c4-c5; Euchirella pulchra, female; Euchirella pulchra, male; Euchirella splendes, c1-c3; Euchirella splendes, c4-c5; Euchirella splendes, female; Euchirella splendes, male; Euchirella spp., c1-c3; Euchirella spp., c4-c5; Euchirella spp., female; Euchirella spp., male; Event label; Farrania frigida, c1-c3; Farrania frigida, c4-c5; Farrania frigida, female; Farrania frigida, male; Gaetanus brevicornis, c1-c3; Gaetanus brevicornis, c4-c5; Gaetanus brevicornis, female; Gaetanus brevicornis, male; Gaetanus cf. pileatus, c1-c3; Gaetanus cf. pileatus, c4-c5; Gaetanus cf. pileatus, female; Gaetanus cf. pileatus, male; Gaetanus kruppii, c1-c3; Gaetanus kruppii, c4-c5; Gaetanus kruppii, female; Gaetanus kruppii, male; Gaetanus spp., c1-c3; Gaetanus spp., c4-c5; Gaetanus spp., female; Gaetanus spp., male; Haloptilus cf. longicirrus, c1-c3; Haloptilus cf. longicirrus, c4-c5; Haloptilus cf. longicirrus, female; Haloptilus cf. longicirrus, male; Haloptilus cf. oxycephalus, c1-c3; Haloptilus cf. oxycephalus, c4-c5; Haloptilus cf. oxycephalus, female; Haloptilus cf. oxycephalus, male; Haloptilus spp., c1-c3; Haloptilus spp., c4-c5; Haloptilus spp., female; Haloptilus spp., male; Heterorhabdidae, c1-c3; Heterorhabdidae, c4-c5; Heterorhabdidae, female; Heterorhabdidae, male; Heterorhabdus cf. lobatus, c1-c3; Heterorhabdus cf. lobatus, c4-c5; Heterorhabdus cf. lobatus, female; Heterorhabdus cf. lobatus, male; Heterorhabdus spp., c1-c3; Heterorhabdus spp., c4-c5; Heterorhabdus spp., female; Heterorhabdus spp., male; Lophothrix humilifrons, c1-c3; Lophothrix humilifrons, c4-c5; Lophothrix humilifrons, female; Lophothrix humilifrons, male; Lophothrix spp., c1-c3; Lophothrix spp., c4-c5; Lophothrix spp., female; Lophothrix spp., male; Lucicutia gaussae, c1-c3; Lucicutia gaussae, c4-c5; Lucicutia gaussae, female; Lucicutia gaussae, male; Lucicutia longicornis, c1-c3; Lucicutia longicornis, c4-c5; Lucicutia longicornis, female; Lucicutia longicornis, male; Lucicutia ovalis, c1-c3; Lucicutia ovalis, c4-c5; Lucicutia ovalis, female; Lucicutia ovalis, male; Lucicutia spp., c1-c3; Lucicutia spp., c4-c5; Lucicutia spp., female; Lucicutia spp., male; Mecynocera clausi, c1-c3; Mecynocera clausi, c4-c5; Mecynocera clausi, female; Mecynocera clausi, male; Megacalanus princeps, c1-c3; Megacalanus princeps, c4-c5; Megacalanus princeps, female; Megacalanus princeps, male; Mesocalanus tenuicornis, c1-c3; Mesocalanus tenuicornis, c4-c5; Mesocalanus tenuicornis, female; Mesocalanus tenuicornis, male; Metridia brevicauda, c1-c3; Metridia brevicauda, c4-c5; Metridia brevicauda, female; Metridia brevicauda, male; Metridia discreta, c1-c3; Metridia discreta, c4-c5; Metridia discreta, female; Metridia discreta, male; Metridia effusa, c1-c3; Metridia effusa, c4-c5; Metridia effusa, female; Metridia effusa, male; Metridia lucens, c1-c3; Metridia lucens, c4-c5; Metridia lucens, female; Metridia lucens, male; Metridia princeps, c1-c3; Metridia princeps, c4-c5; Metridia princeps, female; Metridia princeps, male; Metridia spp., c1-c3; Metridia spp., c4-c5; Metridia spp., female; Metridia spp., male; Metridia venusta, c1-c3; Metridia venusta, c4-c5; Metridia venusta, female; Metridia venusta, male; Metridinidae, c1-c3; Metridinidae, c4-c5; Metridinidae, female; Metridinidae, male; Microcalanus spp., c1-c3; Microcalanus spp., c4-c5; Microcalanus spp., female; Microcalanus spp., male; Mimocalanus spp., c1-c3; Mimocalanus spp., c4-c5; Mimocalanus spp., female; Mimocalanus spp., male; Monacilla spp., c1-c3; Monacilla spp., c4-c5; Monacilla spp., female; Monacilla spp., male; Monacilla typica, c1-c3; Monacilla typica, c4-c5; Monacilla typica, female; Monacilla typica, male; MSN; Multiple opening/closing net; Nannocalanus minor, c1-c3; Nannocalanus minor, c4-c5; Nannocalanus minor, female; Nannocalanus minor, male; Neocalanus gracilis, c1-c3; Neocalanus gracilis, c4-c5; Neocalanus gracilis, female; Neocalanus gracilis, male; Neocalanus robustior, c1-c3; Neocalanus robustior, c4-c5; Neocalanus robustior, female; Neocalanus robustior, male; Nullosetigera impar, c1-c3; Nullosetigera impar, c4-c5; Nullosetigera impar, female; Nullosetigera impar, male; Nullosetigera spp., c1-c3; Nullosetigera spp., c4-c5; Nullosetigera spp., female;
    Type: Dataset
    Format: text/tab-separated-values, 9342 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Publication Date: 2024-03-09
    Description: Gut fluorescence and C/N ratio of Paracalanus sp. determined during two occassions during the mesocosm experiment (Sampling Day 21/22 and 34/35).
    Keywords: Abundance; Biomass; Carbon/Nitrogen ratio; Climate - Biogeochemistry Interactions in the Tropical Ocean; Coastal Upwelling System in a Changing Ocean; CUSCO; Day of experiment; Gut fluorescence; Gut fluorescence, dry mass; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Mesocosm label; Oxygen Minimun zone; SFB754; Species; Stable isotopes; Time in minutes; Time point, descriptive; Treatment; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 1088 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Bode, Maya; Hagen, Wilhelm; Schukat, Anna; Teuber, Lena; Fonseca-Batista, Debany; Dehairs, Frank; Auel, Holger (2015): Feeding strategies of tropical and subtropical calanoid copepods throughout the eastern Atlantic Ocean – Latitudinal and bathymetric aspects. Progress in Oceanography, 138, 268-282, https://doi.org/10.1016/j.pocean.2015.10.002
    Publication Date: 2024-03-09
    Description: The majority of global ocean production and total export production is attributed to oligotrophic oceanic regions due to their vast regional expanse. However, energy transfers, food-web structures and trophic relationships in these areas remain largely unknown. Regional and vertical inter- and intra-specific differences in trophic interactions and dietary preferences of calanoid copepods were investigated in four different regions in the open eastern Atlantic Ocean (38°N to 21°S) in October/November 2012 using a combination of fatty acid (FA) and stable isotope (SI) analyses. Mean carnivory indices (CI) based on FA trophic markers generally agreed with trophic positions (TP) derived from d15N analysis. Most copepods were classified as omnivorous (CI ~0.5, TP 1.8 to ~2.5) or carnivorous (CI 〉=0.7, TP 〉=2.9). Herbivorous copepods showed typical CIs of 〈=0.3. Geographical differences in d15N values of epi- (200-0 m) to mesopelagic (1000-200 m) copepods reflected corresponding spatial differences in baseline d15N of particulate organic matter from the upper 100 m. In contrast, species restricted to lower meso- and bathypelagic (2000-1000 m) layers did not show this regional trend. FA compositions were species-specific without distinct intra-specific vertical or spatial variations. Differences were only observed in the southernmost region influenced by the highly productive Benguela Current. Apparently, food availability and dietary composition were widely homogeneous throughout the oligotrophic oceanic regions of the tropical and subtropical Atlantic. Four major species clusters were identified by principal component analysis based on FA compositions. Vertically migrating species clustered with epi- to mesopelagic, non-migrating species, of which only Neocalanus gracilis was moderately enriched in lipids with 16% of dry mass (DM) and stored wax esters (WE) with 37% of total lipid (TL). All other species of this cluster had low lipid contents (〈 10% DM) without WE. Of these, the tropical epipelagic Undinula vulgaris showed highest portions of bacterial markers. Rhincalanus cornutus, R. nasutus and Calanoides carinatus formed three separate clusters with species-specific lipid profiles, high lipid contents (〉=41% DM), mainly accumulated as WE (〉=79% TL). C. carinatus and R. nasutus were primarily herbivorous with almost no bacterial input. Despite deviating feeding strategies, R. nasutus clustered with deep-dwelling, carnivorous species, which had high amounts of lipids (〉=37% DM) and WE (〉=54% TL). Tropical and subtropical calanoid copepods exhibited a wide variety of life strategies, characterized by specialized feeding. This allows them, together with vertical habitat partitioning, to maintain high abundance and diversity in tropical oligotrophic open oceans, where they play an essential role in the energy flux and carbon cycling.
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...