Sampling and preservation methods for the quantitative enumeration of microzooplankton

James, Mark R.

doi:10.1080/00288330.1991.9516483

Cited by 18 publications

(7 citation statements)

References 17 publications

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“…Being an important link between primary producers and secondary consumers, zooplankton play an important role in aquatic ecosystems (James 1991). Hence a change in the zooplankton community will affect the entire ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Sangakkara¹,

Wijeyaratne

2015

Sri Lanka J. Aquat.

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Diversity and abundance of zooplankton in relation to nitrate-N and total phosphorus levels of 20 minor and medium scale reservoirs in the low country intermediate zone of Sri Lanka were studied in June-October 2013. Total phosphorus content ranged from 0.029 mg L -1 recorded in Wendaruwewa reservoir to 0.529 mg L -1 recorded in Karangamuwa reservoir and Nitrate-N content varied from 1.186 mg L -1 recorded in Adukkane reservoir to 5.625 mg L -1 recorded in Anukkane reservoir indicating that all reservoirs studied are eutrophic. During the present study, a total of 43 species of zooplankton, comprising 31 species of rotifers, 9 species of cladocerans and 3 species of copepods were recorded. Number of zooplankton species in any one reservoir, which ranged from 4 to 13, was significantly correlated with the nitrate-N content (p<0.05). The most widely distributed zooplankton species was Diacyclops nanus, which was present in 15 reservoirs. Abundance of zooplankton ranged from 4 individuals L -1 recorded for Alona monocantha and Chydorus parvus in Wendaruwewa and Metiyagane reservoirs respectively to 1017 individuals L -1 recorded for Filinia terminalis in Galewela reservoir. Margalef index which ranged from 0.532 in Adukkane reservoir to 2.096 in Dewahuwa reservoir, was significantly correlated with nitrate-N content of water (p<0.05). Pielou index ranging from 0.65 in Galewela reservoir to 0.92 in Polpitiya reservoir and Shannon-Weiner index ranging from 0.91 in Munamaldeniya reservoir to 2.13 in Dewahuwa reservoir were not significantly correlated with nitrate-N and total phosphorus levels of water (p>0.05). Keratella quadrata was present only in Anukkane reservoir where the nitrate-N content was the highest and therefore it may be considered as a bio-indicator of high levels of nitrate-N. Eutrophic conditions of theses reservoirs may possibly be due to runoff of nutrients from agricultural fields as these are located in an intense agricultural area. Therefore, it is necessary to take immediate action to control the overuse of inorganic fertilizer in this area so that contamination of water bodies with nutrients can be minimized.

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Section: Introductionmentioning

confidence: 99%

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Sangakkara¹,

Wijeyaratne

2015

Sri Lanka J. Aquat.

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“…picophytoplankton (Hansen et al 1994, Peters 1994, or predation by larger zooplankton species (Froneman et al 1996). It should be pointed out, however, that the use of Lugol's solution to fix the microplankton samples may have resulted in the underestimation of the contribution of dinoflagellates to total cell counts (James 1991, Leakey et al 1994. Also, we were unable to differentiate between the autotrophic and heterotrophic components of the microplankton assemblages.…”

Section: Discussionmentioning

confidence: 69%

Dynamics of the plankton communities of the Lazarev Sea (Southern Ocean) during seasonal ice melt

Froneman¹,

Ea²,

Perissinotto³

et al. 1997

Mar. Ecol. Prog. Ser.

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Size-fractioned primary production and zooplankton grazing impact were estimated along a repeat grid dunng seasonal ice melt in the Lazarev Sea aboard the MV 'SA Agulhas' (voyage 77) in austral summer (December/January) 1994-1995. During the survey, the phytoplankton size composition shifted from a community dominated by nano-and picophytoplankton ( c 2 0 pm) during the first grid to one dominated by microphytoplankton (>20 pm) during the second grid. Total areal production during the first grid was generally dominated by nanophytoplankton and ranged between 133 and 356 mg C m-2 d-'. During the second grid survey, total areal production was higher, ranging between 263 and 400 mg C m-2 d ' Protozoan grazing removed between 0.5 and 31 'Yo of the initial phytoplankton stock or between 33 and 94':c1 of the potential phytoplankton product~on per day during the first grid, and between 0.5 and 8 % of the initial phytoplankton stock or between 9 and 25% of the potential phytoplankton production per day during the second grid The grazing impact of meso-and macrozooplankton during the flrst grid corresponded to < O 5% of chlorophyll stock or < 2 3 % of the daily primary production Dunng the second grid, the grazing impact of meso-and macrozooplankton was higher, removlng on average 1.12"/0 of integrated chlorophyll or 28.7% of daily production These results suggest that the partitioning of carbon between the various size classes of zooplankton dunng seasonal ice retreat is largely determined by the size structure of the phytoplankton.

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“…For counting, the entire plankton sample was searched for species occurring in very low numbers (particularly Piona and Anisops species, which occurred in the plankton only sporadically), and then subsampled for the abundant taxa. The sample was diluted to a known volume, stirred using a figureof-eight motion, and a 5 ml subsample withdrawn using a wide-mouthed automatic pipette, minimising vortices and thus avoiding unrepresentative subsamples (James 1991). Zooplankton numbers were then counted at a magnification of 31.5x using a stereomicroscope.…”

Section: Laboratory Methodsmentioning

confidence: 99%

Seasonal abundance of small cladocerans in Lake Mangakaware, Waikato, New Zealand

Greenwood

Green

Hicks

et al. 1999

New Zealand Journal of Marine and Freshwater Research

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The seasonal changes in the dynamics and life histories of the Cladocera in Lake Mangakaware, North Island, New Zealand, were studied over 19 months by sampling at weekly or 2-weekly intervals. Lake Mangakaware is a 13.3 ha polymictic lake with high nutrient status, low Secchi disc transparencies, and an unstable thermal regime. The four planktonic cladoceran species {Bosmina longirostris, B. meridionalis, Ceriodaphnia pulchella, and C. dubia) exhibited disjunct population maxima. Only B. longirostris was perennially present. All species exhibited low fecundities and low lipid content, indicating that food resources were limited and that competitive interactions and resistance to starvation were probably important in determining species success. Increases in body size in cooler seasons were unrelated to clutch size, giving further support for the view that available food was limited. These results are consistent with previous experimental findings that subtle differences in life history can determine seasonal success and the outcome of competition between similar species.

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Sampling and preservation methods for the quantitative enumeration of microzooplankton

Cited by 18 publications

References 17 publications

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Dynamics of the plankton communities of the Lazarev Sea (Southern Ocean) during seasonal ice melt

Seasonal abundance of small cladocerans in Lake Mangakaware, Waikato, New Zealand

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