Distribution and Ecology of Harpacticoid Copepods of an Intertidal Mudflat

Barnett, P. R. O.

doi:10.1002/iroh.19680530202

Cited by 74 publications

(30 citation statements)

References 34 publications

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“…They also demonstrated that the efficiency of the Uhlig-method depends on diameter of the extraction tube, and it is also clear that it depends on the amount of sediment extracted, the extraction time and the mesh size of the sieve, which makes this method unreliable for comparative studies. Barnett (1968) described a new extraction method (for Harpacticoidea) with better results than former extraction methods. Heip (1971Heip ( , 1976 found that the method gives better results for most meiofauna taxa in fine sand and sand with detritus or mud than any other method and can have an efficiency up to 100 % .…”

Section: Resultsmentioning

confidence: 99%

Comparison of three different extraction methods for Turbellaria

Martens¹

1984

Mar. Ecol. Prog. Ser.

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Three different extraction methods for Turbellaria were compared, 2 of which use living material. The first method is based on sea-water ice treatment (Uhlig-method), the second employs decantation of narcotized fauna (MgC1,-method). The third method is the Bamett-method, performed on preserved material. Three series of 12 samples each were analysed quantitatively. Turbellaria were counted and identified to the order level. For the turbellarian population, as a whole, the numbers of individuals extracted alive (Uhlig-or MgC1,-method) was less than 50 % of the number extracted from the preserved samples (Barnett-method). Differences between Uhlig-method and MgC1,-method were not statistically significant. However, for Acoela and Retronectida, the Uhlig-method was more efficient than both other methods. We conclude that for a reliable quantitative analysis of Turbellaria 2 different extraction methods are required: one should employ extraction of living material (Uhligmethod) and one extraction of fixed material. For qualitative investigations extract~on of living material is recommended.

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Section: Resultsmentioning

confidence: 99%

Comparison of three different extraction methods for Turbellaria

Martens¹

1984

Mar. Ecol. Prog. Ser.

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“…Although dealing quantitatively with meiofauna distribution few of these works have attempted long term studies with the object of correlating fluctuations with environmental parameters (Tietjen 1966;Barnett 1968). To this end, therefore, a number of environmental parameters were used to explain the distribution and seasonal fluctuation of the meiofanna in the Swartkops estuary near Port Elizabeth.…”

Section: Introductionmentioning

confidence: 99%

An Ecophysiological Study of the Meiofauna of the Swartkops Estuary

Dye¹,

Furstenberg²

1978

Zoologica Africana

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Environmental correlations with mean, as well as seasonal, distribution and abundance of the meiofauna in two exposed beaches in the Swartk:ops Estuary, near Port Elizabeth, were elucidated. Population densities showed a direct relationship with particle size. Consequent on this, oxygen appeared to be the controlling factor although desiccation played a role in the intertidal distribution of meiofauna in sandy areas. Seasonal fluctuations in numbers were characterized by peaks occurring in spring and autumn. Variations of temperature and oxygen were found to be responsible for this pattern. The presence of the sand prawn Callia111JSsa kraussi affected both vertical penetration and seasonal fluctuation of the meiofauna. Since fluctuation in nitrogen and chlorophyll a content of the substrate bore little relationship to the fluctuation of the meiofauna, it is concluded that food is not limiting in these areas. Biomass determinations revealed that nematodes, which were the dominant taxon, weighed 0,42 p.g individual mean ash-free dry mass and harpacticoid copepods 0,47 p.g. On this basis the standing crop biomass was 0,40 gfm' in the sandy areas and 0,07 g/m' in the muddier areas, both to a depth of 20 em.

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“…Copepods were separated from the sediment and concentrated on a 62 pm sieve with the Barnett (1968) Zausodes arenicolus (see 'Introduction') were rinsed 3 times in distilled water, then stored at 4 "C in separate vials containing 3 % gluteraldehyde. Uptake of radioactivity by males and females of clasping pairs was determined by teasing apart the pair and separately quantifying radioactivity in males and females.…”

Section: Methodsmentioning

confidence: 99%

Mechanisms of uptake of radioactive labels by meiobenthic copepods during grazing experiments

Carman¹

1990

Mar. Ecol. Prog. Ser.

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Distribution and Ecology of Harpacticoid Copepods of an Intertidal Mudflat

Cited by 74 publications

References 34 publications

Comparison of three different extraction methods for Turbellaria

Comparison of three different extraction methods for Turbellaria

An Ecophysiological Study of the Meiofauna of the Swartkops Estuary

Mechanisms of uptake of radioactive labels by meiobenthic copepods during grazing experiments

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