Day time variations of zooplankton species composition: observations from the wetlands of Assam, India

Das, Papia; Kar, Sulata; Das, Uma; Bimola, Maibam; Kar, Devashish; Aditya, Gautam

doi:10.1590/s2179-975x1418

Cited by 5 publications

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References 26 publications

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“…The trophic transfer e ciencies from phytoplankton to zooplankton and from zooplankton to sh are largely dependent on the taxa of zooplankton available in an aquatic ecosystem [21,22]. The composition of macroinvertebrate predator and sh species can be in uenced by the pattern of changes in the zooplankton species composition within the same space [23]. In aquatic ecosystems, decline in zooplankton diversity will ultimately affect higher trophic levels; resulting in loss of species, habitat or even ecosystems and ecosystem services, if the trend was not abated [24].…”

Section: Introductionmentioning

confidence: 99%

Water Quality and Plankton Assessment of Eme River, Umuahia, Southeast Nigeria

Anyanwu

Adetunji

Umeham

2021

Preprint

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Certain anthropogenic activities have negative impacts on the aquatic ecosystems. Plankton are sensitive to their environment and are used to monitor anthropogenic impacts. A South-eastern Nigeria River was studied from December 2017 to November 2018 in 6 stations; to assess the plankton community, water quality and anthropogenic impacts. The river was subjected to intense sand mining activities among other activities. The plankton was sampled with filtration method while water was collected and analysed using standard methods. A total of 36 phytoplankton species and 27 zooplankton species were recorded with Chlorophyceae and Rotifers being the most abundant groups. The most abundant species - Melosira granulata (phytoplankton) and Daphnia pulex (zooplankton) are pollution indicators. Some of the physicochemical parameters showed that the river was perturbed by the anthropogenic activities in the watershed. However, the plankton assemblage and community structure gave an indication of a stable environment; though the zooplankton fauna showed some level of stress. The impacts of sand mining activities on water quality and plankton were more in the downstream stations (4–6) where sand mining was intense while perturbation from swimming children and related activities were observed in station 1 especially during the dry season. The presence of eutrophic indicators and tolerant species showed that the river was tending towards eutrophication. Sand mining activities contributed to the nutrient enrichment of the river. CCA showed the major water quality parameters that influenced the plankton community structure. There is need to regulate illegal sand mining activities in the river.

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