Population Dynamics of Some Freshwater Zooplankton

Hazelwood, Donald H.; Parker, Richard

doi:10.2307/1932078

Cited by 41 publications

(16 citation statements)

References 28 publications

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“…Increases in alkalinity due to evaporation of water have been recorded previously (Hazelwood and Parker 1961) but the marked decline during the rainy months in the ponds at Kamal were probably due to dilution. Similar observation ofdecrease in methyl orange alkalinity (bicarbonate) and electrical conductivity due to rain water or the influx of flood water has also been reported elsewhere (Sreenivasan et al 1964) who also reported a positive correlation between the electric conductivity and the bicarbonate alkalinity of hypolimnetic water.…”

Section: Liapromussupporting

confidence: 53%

The physico-chemical environment and the plankton of managed ponds in Haryana, India

Singhal

Jeet

Davies

1986

Proc. Indian Acad. Sci. (Anim. Sci.)

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An investigation was made of the physical, chemical conditions of the water and substrate of nursery-cum-research-cum-rearing-cum-stocking ponds at Central Inland Fisheries Research Institute, Kamal. Temperature, pH, CO 2 , dissolved oxygen, chloride, phosphate, alkalinity, nitrates, organic matter, total solids, turbidity, electric conductivity, nitrogen, P 20 S , sand, silt, clay, Caco l , etc. were measured monthly. Statistical analysis of these factors showed some significant correlations. The phyto-and zooplankton were also sampled and the seasonal changes in abundance recorded.

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Section: Liapromussupporting

confidence: 53%

The physico-chemical environment and the plankton of managed ponds in Haryana, India

Singhal

Jeet

Davies

1986

Proc. Indian Acad. Sci. (Anim. Sci.)

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“…Hazelwood and Parker (1961) conducted gut analyses on Daphnia schodleri and Diaptomus leptopus and found both species consumed particles 0.45-60 1sm in diam. Hazelwood and Parker (1961) conducted gut analyses on Daphnia schodleri and Diaptomus leptopus and found both species consumed particles 0.45-60 1sm in diam.…”

Section: The Coexistence Of Zooplankton Populationsmentioning

confidence: 99%

“…During this study, different species of Daphnia and Diaptomus usually exhibited strong overlap values with each other. Hazelwood and Parker ( 1961) conducted gut analyses on Daphnia schodlerf and Diaptomus leptopus and found both species consumed particles 0.45-60 p.m in diam. They concluded that these species were competing, but they did not elaborate on how competitive coexistence was achieved.…”

Section: The Coexistence Of Zooplankton Populationsmentioning

confidence: 99%

The Dynamics of Aquatic Systems: A Comparative Study of the Structure of Four Zooplankton Communities

Lane¹

1975

Ecological Monographs

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 139.184.Abstract. This study compares the structure of the limnetic zooplankton communities of four very different lakes ranging from an oligotrophic Great Lake to a small dystrophic reservoir. Only filter feeding cladocerans and calanoid copepods are considered. Using Levins' Theory of the Niche analysis, I measured habitat overlap values for each species pair to determine to what extent habitat selection can explain the number of limnetic zooplankton species coexisting in these lakes and to what extent other factors, such as resource allocation or differential predation, must be invoked to explain the observed diversity. A substantial portion of the ecological overlap of zooplankton populations can be alleviated by habitat selection.Zooplankton communities are dominated by two to three species, in both numerical abundance and grazing intensity. In Lake Michigan (large, oligotrophic), habitat selection was the major mechanism of competitive coexistence and it was achieved by extensive vertical migrations (mean a = .47). In Gull Lake (small, mesotrophic), habitat selection via vertical migration also predominated (mean a = .37) as the major mechanism of competitive coexistence. Three species, Diaptomus sp., Daphnia retrocurva, and Daphnia galeata exhibited high habitat overlap coefficients. In Cranberry Lake, a dystrophic reservoir, most species possessed high overlap coefficients (mean a = .62) and minimal migration amplitudes. Diaptomus spp. and Daphnia catawba predominated. In Lake George, a medium-sized oligotrophic lake, mean habitat overlap was also high (mean a = .65). The three dominant species were Diaptomus sp., Diaphanosoma leuchtenbergianum and Daphina galeata.For the latter two communities, which possessed similar high and mean overlap values, the basic equation was weighted by the standing crop and turnover rate of phytoplankton. The spatial-temporal positioning of the Lake George populations were correlated with algal standing crop and turnover patterns while the Cranberry Lake populations were not.

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“…Cladocerans, and in particular Daphnia, provide ideal populations for study since eggs as well as adults can be collected quantitatively, and the relatively high reproductive capacity facilitates examination of biological responses to environmental change over a limited period of time. Many such detailed studies have been made (Hazelwood & Parker, 1961;Stross, Nees & Hasler, 1961;Hall, 1964;Wright, 1965) but rarely have these been continued for more than one year, and in some cases few population parameters have been determined. reduced programme of physical and chemical measurement was continued as part of the zooplankton study in 1971.…”

Section: Introductionmentioning

confidence: 99%

Population dynamics and production of Daphnia hyalina in a eutrophic reservoir

George

Edwards

1974

Freshwater Biology

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The population dynamics and production of Daphnia hyaiina^ the dominant cladoceran in Eglwys Nynydd, a shallow eutrophic reservoir in South Wales, were studied for 2 years against a background of limnological measurements. The appearance and development of successive generations from egg to adult could be followed from changing numbers in arbitrarily defined size classes. Seasonal variations in mean length, mean brood-size and proportion of gravid adults were recorded and mean brood-size was related to changing food and temperature conditions. Egg-development times for D. hyaiina were determined in culture and the population parameters finite birth (S), instantaneous birth {b'), instantaneous population change (r'), instantaneous death {d') and finite death rates (£)) were estimated from field data. Turnover and production estimates were calculated from finite death rates and biomass. The calculated potential rate of increase {b') was nearly always greater than the observed rate of increase (r'): seasonal changes in death rate {d') generally parallel changes in birth rate (/>') but remain somewhat out of phase. Population oscillations are probably due to a delay in the expression of the effects of population density upon birth and death rates.

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Population Dynamics of Some Freshwater Zooplankton

Cited by 41 publications

References 28 publications

The physico-chemical environment and the plankton of managed ponds in Haryana, India

The physico-chemical environment and the plankton of managed ponds in Haryana, India

The Dynamics of Aquatic Systems: A Comparative Study of the Structure of Four Zooplankton Communities

Population dynamics and production of Daphnia hyalina in a eutrophic reservoir

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