Decline in zooplankton diversity in the Damietta Branch of the Nile River, Egypt: a comparative study with a 24-year span

Helal, H.

doi:10.1080/03680770.2006.11903054

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…This coarse mesh net causes the undersampling of small zooplankton specimens such as rotifers and small copepods, which probably lead to an underestimation of the total zooplankton abundances (Chisholm and Roff, 1990). Accordingly, zooplankton abundances in the present study were significantly lower than those found in other areas along the Egyptian part of Nile River, such as upper Egypt (El-Bassat, 1995;El-Otify and Iskaros, 2015;Rzoska, 1976), Rosetta Branch (Abdel-Halim et al, 2013;El-Shabrawy and Khalifa, 2002;Hegab, 2010), and that studied previously in Damietta Branch by Helal (1981;2006). On the other hand, most of the standard sampling protocols for zooplankton in the Egyptian waters are restricted only to mesh sizes < 60 μm.…”

Section: Discussioncontrasting

confidence: 61%

“…According to Sosnovsky and others (2016), the mesozooplankton community comprises mostly copepods and cladocerans. In the 1981 study (Helal, 1981), cladocerans were represented by six different species decreased to four species in 2006 study (Helal, 2006), whereas in the present study the group was represented by eight species. The copepods were represented by ten species in the current investigation, against eight species in 1981 study.…”

Section: Discussioncontrasting

confidence: 45%

“…The available data existing in the literature on the Nile River Damietta Branch zooplankton community structure were provided by Helal (1981;2006). However, the present study is limited by the large mesh size used (180 µm).…”

Section: Discussionmentioning

confidence: 99%

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Mesozooplankton of the Damietta Branch, River Nile, Egypt.

El-Tohamy¹,

Abdel-Baki²

2019

Egypt. J. of Aquatic Biolo. and Fish.

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River was studied to assess the impacts caused by human activities. The sampling was done monthly at seven stations during October 2013-September 2014. A plankton ring net with 180 µm mesh size was used to avoid the bias toward the collection of smaller mesozooplanktons such as rotifers and copepod larvae. Thirty-six mesozooplankton taxa were recorded. Cladocera was the most abundant group (41.6%), followed by Copepods (29.9%), Rotifera (14.8%), and Ostracoda (13.2%). The decrease in rotifers density in favor of copepods and cladocerans in the ROT:CLA:COP ratio suggesting an increase in the area eutrophication. According to SIMPER analysis, the most important taxa were Bosmina longirostris, Ceriodaphnia reticulate, Moina micrura, Acanthocyclops americanus, Brachionus calyciflorus, and Candona subgibba. Multivariate analysis indicated that the variations in species distribution were associated with environmental factors, especially water temperature, conductivity, and nitrate. The degree of anthropogenic disturbance determines the quality and quantity of plankton in the study area. Consequently, the discharged post-cooling waters should be controlled to protect zooplankton fauna and in consequence the planktivorous fish of the study area.

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Section: Discussioncontrasting

confidence: 61%

Section: Discussioncontrasting

confidence: 45%

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Mesozooplankton of the Damietta Branch, River Nile, Egypt.

El-Tohamy¹,

Abdel-Baki²

2019

Egypt. J. of Aquatic Biolo. and Fish.

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Eutrophication of the Nile: Comparative nutrient data of the Damietta Branch, Egypt, from 1978 and 2003

Helal¹

2010

SIL Proceedings, 1922-2010

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A georeferenced dataset for occurrence records of the phylum Rotifera in Africa

et al. 2023

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We report a dataset of all known and published occurrence records of animals of the phylum Rotifera, including Bdelloidea, Monogononta, and Seisonacea (with the exclusion of Acanthocephala) for Africa and surrounding islands and archipelagos. The dataset includes 24,704 records of 914 taxa (subspecies: 38; species: 783; genus: 76; family: 17), gathered from 610 published papers. The published literature spans from 1854 to 2022, with the highest number of records in the decades 1990-1999 and 2010-2019. The African countries with the highest number of taxa are Nigeria, Algeria, South Africa, and Democratic Republic of the Congo, whereas no records are yet available for a dozen countries. The number of species known from each country can be explained mostly by sampling efforts, measured as the number of papers published for each country up to now. The dataset is available through the Open Science Framework (OSF) and in the Global Biodiversity Information Facility (GBIF).

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Decline in zooplankton diversity in the Damietta Branch of the Nile River, Egypt: a comparative study with a 24-year span

Cited by 3 publications

References 4 publications

Mesozooplankton of the Damietta Branch, River Nile, Egypt.

Mesozooplankton of the Damietta Branch, River Nile, Egypt.

Eutrophication of the Nile: Comparative nutrient data of the Damietta Branch, Egypt, from 1978 and 2003

A georeferenced dataset for occurrence records of the phylum Rotifera in Africa

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