Distribution of aquatic plants in relation to environmental factors in the Nile Delta

Khedr, Abdel‐Hamid A.; El-Demerdash, Mohamed

doi:10.1016/s0304-3770(96)01090-x

Cited by 52 publications

(38 citation statements)

References 11 publications

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“…Negative correlation between PME of Myriophyllum spicatum and cover of woody species on the banks indicates the preference of the species to river section with higher portion of light. Similar results found Khedr & El-Demerdash (1997) in Nile Delta.…”

Section: Discussionsupporting

confidence: 87%

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Diversity of aquatic macrophytes in relation to environmental factors in the Slatina river (Slovakia)

2006

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Distribution and plant mass of aquatic macrophytes, and their relation to environmental conditions was studied in the submontane-colline Slatina river in 2004. Diversity of macrophytes was low, only 8 vascular plants, 3 mosses and group Algae filamentosae were found. Myriophyllum spicatum is dominant species, Fontinalis antipyretica, Rhynchostegium riparioides and Algae filamentosae are frequent. Interactions between flow class, bed material, depth of water and the first three mentioned macrophytes, as well as Jungermannia leiantha were detected. Sparganium erectum prefers more antrophogenic conditions and Myriophyllum spicatum prefers the light. According to cluster analysis, three distinct and ecologically well separated parts of the river were identified. Based on Reference index, poor ecological status for the studied part of the Slatina river was estimated.

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Section: Discussionsupporting

confidence: 87%

“…BaatrupPedersen & Riis, 1999), as well as spatial structure, light regime, competition or effect of animals (e.g. Dennison & Orth, 1993;Khedr & El-Demerdash, 1997;Cristofor et al, 2003;Demars & Harper, 2005;Hervé et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Diversity of aquatic macrophytes in relation to environmental factors in the Slatina river (Slovakia)

2006

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“…The water was moderately eutrophic (TSI index ca. 70) and the pH value was considerably high (pH about 8.3), similarly to the situation in the North Africa (Khedr and El-Demerdash 1997). The standing water community of P. nodosus has been distinguished in Germany (Rennwald 2000).…”

Section: Discussionmentioning

confidence: 82%

Rare and threatened pondweed communities in anthropogenic water bodies of Opole Silesia (SW Poland)

Nowak

Czerniawska-Kusza

2011

Acta Soc Bot Pol

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The paper presents results of geobotanic studies conducted in anthropogenic water bodies like excavation ponds, fish culture ponds, other ponds, dam reservoirs, ditches, channels and recreational pools incl. watering places in Opole Silesia and surroundings in the years [2002][2003][2004][2005]. The research focused on occurrence of threatened and rare pondweed communities. As the result of the investigations of several dozen of water bodies, 28 localities of rare pondweed communities were documented by 75 phytosociological relevés. Associations of Potametum trichoidis J. et R Tx. in R. Tx. 1965, Potametum praelongi Sauer 1937, P. alpini Br.-Bl. 1949, P. acutifolii Segal 1961, P. obtusifolii (Carst. 1954) Segal 1965 and P. perfoliati W. Koch 1926 em. Pass. 1964 were found as well as communities formed by Potamogeton berchtoldii, P. nodosus and P. pusillus.The study confirms that anthropogenic reservoirs could serve as last refugees for many threatened pondweed communities, which decline or even extinct in their natural habitats. The results indicate that man-made habitats could shift the range limits of threatened species and support their dispersal. The authors conclude that habitats strongly transformed by man are important factors in the natural syntaxonomical diversity protection and should not be omitted in strategies of nature conservation.KEY WORDS: pondweed communities, anthropogenic reservoirs, syntaxonomical diversity, Potamogeton sp., Potamion. special habitats for rare plant communities. The majority of the artificial ponds has clear, meso-or moderately eutrophic waters with no or very poor plant cover (very favourable for pioneer vegetation).As the natural ox-bow lakes in the Opole Silesia region have been destroyed by flood control investments (despite of their legal protection!) the artificial water bodies are substitute habitats and sometimes the only opportunity for the existence of many threatened pondweed communities.So far, the pondweed communities have never been an object of special geobotanical investigations in the Opole Silesia. The interesting comparative data were published for the neighbouring Upper Silesia by Sendek (1976). MATERIAL AND METHODSGeobotanic studies in the years 2002 to 2005 were carried in the areas of anthropogenic reservoirs in the Opole Silesia and neighbouring regions (Fig. 1). Generally, 28 sites and 75 vegetation plots with rare pondweed occurrence were sampled using phytosociological Braun-Blanquet approach (1964).The phytosociological relevés were made in 12 types of anthropogenic reservoirs: gravel-pits waters (14), claypits waters (12), reservoirs in quarries (12), fish culture ponds (8), sand-pits waters (6), other ponds (6), canals (5 relevés), drainage ditches (4), dam reservoirs (3), fire emergency ponds (2), recreational ponds, incl. watering places (2) and mid-field pools (1).The object of the investigation were plant communities built by threatened pondweed species. Threat level was determined according to the local red lists of vascular plants...

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“…Several studies have found that the variations in water depth lead to variations in species zonation, distribution, biomass and richness (Khedr and El-Demerdash 1997;Fernandez-Alaez 1999;Arts 2002;Lacoul and Freedman 2006). The turbidity of water also seems to determine the extent of colonization of submerged aquatic plants (Kaul et al 1978;Kaul 1982;Pandit 1992Pandit , 2008Scheffer et al 1992).…”

Section: Hydrological Variationsmentioning

confidence: 99%

Factors affecting the distribution patterns of aquatic macrophytes

Pandit

Ganai

2014

Limnological Review

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Aquatic macrophytes constitute important components of many freshwater ecosystems. The manifold role of aquatic macrophytes in freshwater habitats is closely linked to their distribution, which in turn depends on a myriad of factors. Foremost, among these are light, water temperature, water quality changes and nutrient enrichment, sediment composition and fluctuations in water levels. Light and temperature are of paramount importance in determining the distribution (with depth, season and latitude), thereby influencing productivity and species composition as well. Sediment compositions markedly affect the growth rates of macrophytes which in turn have a profound influence on the distribution of aquatic macrophytes. Water quality changes and nutrient enrichment can cause considerable variations in the species richness, composition, and density of aquatic vegetation. The reduction in water levels could bring drastic changes in the species composition and distribution of macrophytes. Factors associated with competition, herbivory, land use and land cover changes etc. also play an important role in shaping macrophyte distribution and community structure. In this review we examine both biotic and abiotic factors that influence the structural attributes like species composition, distribution, abundance and diversity of aquatic macrophytes.

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Distribution of aquatic plants in relation to environmental factors in the Nile Delta

Cited by 52 publications

References 11 publications

Diversity of aquatic macrophytes in relation to environmental factors in the Slatina river (Slovakia)

Diversity of aquatic macrophytes in relation to environmental factors in the Slatina river (Slovakia)

Rare and threatened pondweed communities in anthropogenic water bodies of Opole Silesia (SW Poland)

Factors affecting the distribution patterns of aquatic macrophytes

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