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30 results for “Microzooplankton”
McMurdo Dry Valleys Microzooplankton : Cryptophyte, Ciliate, and Heterotrophic Nanoflagellate Abundances
In conjunction with the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, lakes were monitored for microzooplankton by a team based out of the University of Nottingham (led by Johanna Laybourn-Parry). This dataset shows the abundance of heterotrophic nanoflagellates, cryptophytes, and ciliates found at various depths in Lake Fryxell and Lake Hoare.
McMurdo Dry Valleys Microzooplankton : Flagellate Grazing in Lakes Hoare and Fryxell
In conjunction with the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, lakes were monitored for microzooplankton by a team based out of the University of Nottingham (led by Johanna Laybourn-Parry). This dataset shows grazing rates of heterotrophic and mixotrophic flagellates found in Lakes Hoare and Fryxell at various depths and dates.
McMurdo Dry Valleys Microzooplankton : Ciliate Grazing Rates
In conjunction with the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, lakes were monitored for microzooplankton by a team based out of the University of Nottingham (led by Johanna Laybourn-Parry). This dataset shows grazing rates of ciliates feeding on cryptophytes between November 1997 and January 1998. The sample for this micro dataset was gathered at the Lake Fryxell.
Phytoplankton growth and microzooplankton grazing rates from CCE LTER Process cruises in the California Current System, 2006 - 2017.
Rates of phytoplankton community growth and microzooplankton grazing on phytoplankton were assessed from chlorophyll a analyses of in situ dilution incubations as described in Landry et al. (2009). For each experiment (Array #), seawater was collected from predawn CTD (~2 a.m. local time) casts at 6-8 depths spanning the upper to lower euphotic zone. For each depth, we prepared a pair of polycarbonate bottles (2.7 L), one with whole seawater (100%), and one with 33% whole seawater (diluted with 0.1-µm filtered seawater) at each depth. Seawater was filtered directly from the Niskin bottles using a peristaltic pump, silicone tubing and an in-line Suporcap filter capsule that had previously been acid washed (10% trace-metal grade HCl followed by Milli-Q and seawater rinses). Dilution treatment bottles received pre-measured volumes of filtered water from the collection depths, and then were gently filled (silicone tubing below the water level) with unscreened water from the Niskin bottles. The filled bottles were tightly capped, placed into net bags and clipped onto attached rings at the depth of collection on a tether line attached to a satellite-tracked surface drifter (WOCE SVP) with a top strobe light, Globalstar telemetry and a 3-m holey-sock drogue centered at 15-m (mixed layer). Incubations were done in situ for 24-h (daily) to get daily averaged rates. In most cases, repeated experiments/deployments were done over the course of 2-5 days, using water collected each morning at the location of the drifter. These back-to-back experiments define experimental “cycles”. The second set of experiments were set up, before recovering the first. Hand recovery of the array, switching of net bags and redeployment was generally completed in 15-20 min. Rate estimates are based on initial and final subsamples (250 ml) taken for fluorometric analyses of Chl a. The samples were immediately filtered onto GF/F filters, and the Chl a extracted with 90% acetone in a dark refrigerator
Microzooplankton data of NEREA Augmented Observatory
<p>Samples were collected at the selected depth using Niskin bottles and immediately fixed with Lugol's solution (1%). Quantitative analysis is carried out using an inverted microscope after the settling of a variable volume of sample (Utermhöl, 1958). Volumes vary in relation to the number of cells present in the sample. At first, 100mL are settled form each sample and cells enumerated. The volume of sample is considered sufficient if it is possible to count at least 100 cells on a transect. Otherwise additional volume is settled on top of the same chamber up to a maximum of 250mL. Counting is done over the whole sedimentation chamber or half of it, depending on the characteristics of the sample.</p>
Fig. 8 in Microzooplankton in a Warming Arctic: A Comparison of Tintinnids and Radiolarians from Summer 2011 and 2012 in the Chukchi Sea
Fig. 8. Sedimentation rates of tintinnid loricas and radiolarian skeletons at 500 m on the Voering Plateau in the Norwegian Sea based on data from Bathman et al. (1990). Note that the flux of tintinnids and radiolarians, presumably reflecting concentrations of living cells in the surface waters, appear distinct. The apparent distinct temporal trends of tintinnids and radiolarians in the Norwegian Sea contrasts with the Chukchi Sea data showing largely parallel trends in concentrations (Fig. 3).
Fig. 7 in Microzooplankton in a Warming Arctic: A Comparison of Tintinnids and Radiolarians from Summer 2011 and 2012 in the Chukchi Sea
Fig. 7. Relative abundances (portion of the overall population) of each tintinnid species found in August 2011 with extensive sea ice and August 2012 with no sea ice. The numbers in circles show the lorica oral diameter in µm of the species. Note that the 2011 assemblage was dominated by the large-mouthed Ptychocylis urnula (LOD = 75 µm) and 2012 assemblage was dominated by the smallmouthed Salpingella faurei (LOD = 11 µm).
Figure 1 in Peculiarities of seasonal dynamics of net primary production and its microzooplankton grazing in the coastal waters of the Black Sea (Sevastopol region)
Figure 1. Map of the sampling stations: 1—the exit from the Quarantine Bay (St.1); 2—Sevastopol Bay (St. 2).
Fig. 6 in Notes on the Occurrence of Tintinnid Ciliates, and the Nasselarian Radiolarian Amphimelissa setosa of the Marine Microzooplankton, in the Chukchi Sea (Arctic Ocean) Sampled each August from 2011 to 2020
Fig. 6. Morphological variability of Ptychocylis obtusa found in a single sample. The 18 cells shown were the first properly orientated cells encountered in a sample aliquots from Station 9 of the 2014 cruise. Certain individuals shown have lorica morphologies resembling those of forms recognized as distinct species of Ptychocylis: P. drygalski (C) and P. acuta (F and O).
Fig. 3. The left panel shows a in Notes on the Occurrence of Tintinnid Ciliates, and the Nasselarian Radiolarian Amphimelissa setosa of the Marine Microzooplankton, in the Chukchi Sea (Arctic Ocean) Sampled each August from 2011 to 2020
Fig. 3. The left panel shows a species accumulation curve: the cumulative number of forms encountered as a function of sampling effort, here shown as the number of samples or stations sampled over the 10-year period of our study. Right panel shows the temporal distributions: how many species of tintinnids were found in all 10 years, 9 years, etc. Note that the majority of species were found in samples from only 1 or 2 years.
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