Ingestion and clearance rates of Copepods
Cobertura |
MEDIAN LATITUDE: -48.108138 * MEDIAN LONGITUDE: 20.872903 * SOUTH-BOUND LATITUDE: -52.016160 * WEST-BOUND LONGITUDE: 19.999330 * NORTH-BOUND LATITUDE: -47.669000 * EAST-BOUND LONGITUDE: 21.083160 * DATE/TIME START: 2000-10-31T18:45:00 * DATE/TIME END: 2000-11-29T19:30:00 |
---|---|
Data(s) |
19/05/2006
|
Resumo |
Feeding activity, selective grazing and the potential grazing impact of two dominant grazers of the Polar Frontal Zone, Calanus simillimus and Rhincalanus gigas, and of copepods < 2 mm were investigated with incubation experiments in the course of an iron fertilized diatom bloom in November 2000. All grazers were already actively feeding in the low chlorophyll waters prior to the onset of the bloom. C. simillimus maintained constant clearance rates and fed predominantly on diatoms. R. gigas and the small copepods strongly increased clearance and ingestion of diatoms in response to their enhanced availability. All grazers preyed on microzooplankton, most steadily on ciliates, confirming the view that pure herbivory appears to be the exception rather than the rule in copepod feeding. The grazers exhibited differences in feeding behavior based on selectivity indices. C. simillimus and R. gigas showed prey switching from dinoflagellates to diatoms in response to the phytoplankton bloom. All grazers most efficiently grazed on large diatoms leading to differences in daily losses for large and small species, e.g. Corethron sp. or Thalassionema nitzschioides. Species-specific diatom mortality rates due to grazing suggest that the high feeding activity of C. simillimus prior to and during the bloom played a role in shaping diatom population dynamics |
Formato |
application/zip, 21 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.738250 doi:10.1594/PANGAEA.738250 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
Schultes, Sabine (2004): The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean. PhD Thesis, University of Bremen, Germany, 167 pp, urn:nbn:de:gbv:46-diss000010581 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Schultes, Sabine; Verity, Peter; Bathmann, Ulrich (2006): Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations. Journal of Experimental Marine Biology and Ecology, 338(1), 16-34, doi:10.1016/j.jembe.2006.06.028 |
Palavras-Chave | #Ammonia excretion, standard deviation; Ammonia excretion per individual; ANT-XVIII/2; Auto-analyzer II, Technicon; Biomass as carbon per individual; Biomass as nitrogen per individual; Biom C/ind; Biom N/ind; BONGO; Bongo net; Chaetoceros spp.; Ciliates; Clearance rate, standard deviation; Clearance rate per individual; Corethron spp.; CR; CR std dev; Depth, bottom/max; Depth, top/min; DEPTH, water; Depth bot; Depth top; Depth water; Diatoms < 20 µm; Diatoms > 100 µm; Diatoms 20-50 µm; Diatoms 50-100 µm; Diatoms average; Dictyocha speculum; dm/ind; Dry mass per individual; EisenEx; Element analyser CNS, Carlo Erba NA1500; European Iron Enrichment Experiment in the Southern Ocean; Event; Fragilariopsis kerguelensis; Guinardia spp.; Gut fluorescence technique (Mackas & Bohrer, 1976); Gut passage time; heterotrophic dinoflagellates; heterotrophic nanoflagellates; Ingestion rate, standard deviation; Ingestion rate of carbon per individual; Ingestion rate of chlorophyll a per day per individual; Init gut cont/ind; Initial gut content of chlorophyll a per individual; In vitro incubation (Frost, 1972); IR C/ind; IR chl a/ind; IR std dev; Latitude; LATITUDE; Longitude; LONGITUDE; NH3/[NH4]+ exc/ind; NH3/[NH4]+ exc std dev; Optical microscopy; or size; Oxygen, Winkler (Culberson, 1991, WOCE Report 68/91); Phosphate, excretion, standard deviation; Phosphate, excretion per individual; phototrophic nanoflagellates; PO4 exc; PO4 exc/ind; Polarstern; PS58/006-6; PS58/007-3; PS58/007-4; PS58/009-5; PS58/011-5; PS58/014-1; PS58/042-3; PS58/042-4; PS58/043-3; PS58/045-8; PS58/046-10; PS58/049-7; PS58/061-4; PS58/088-5; PS58/089-1; PS58/107-1; PS58/108-6; PS58 EISENEX; Pseudonitzschia lineola; Pseudonitzschia turgidula; Respiration rate, oxygen, per individual; Respiration rate, oxygen, standard deviation; Resp O2/ind; Resp O2 std dev; Rhizolsolenia chunii; Size; South Atlantic; Species; Stage; Thalassionema nitzschioides; Weighing of dry specimens |
Tipo |
Dataset |