Submerged and floating-leaved aquatic macrophytes (euhydrophytes)

Denny, Patrick

doi:10.1007/978-94-009-5504-2_2

Cited by 12 publications

(5 citation statements)

References 41 publications

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“…In terms of the range of salinities of African lakes, it lies around the middle with sodium and bicarbonate as the dominant ions (Denny, 1985 ;Talling, 1992) . The high alkalinity and photosynthetic activity of the algal biomass accounts for some very high pH values .…”

Section: Introductionmentioning

confidence: 99%

Heavy metal contamination of Lake George (Uganda) and its wetlands

et al. 1995

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Lake George is a shallow equatorial lake in Uganda which, around its fringe, has a wetland designated as a Ramsar site of high international importance . A nearby copper mine has caused serious metal pollution of the surrounding land. Results show that heavy metals from mine waste, particularly copper and cobalt, are entering Kahendero Swamp, part of the Ramsar wetland, and contaminating the lake . In the lake, metals pass along the food chain . The distribution of metals in the wetland and possible modes of transport into the lake are discussed . The consequences of the metal contamination are considered and recommendations for its clean-up, especially in the light of future developments, are made .

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Section: Introductionmentioning

confidence: 99%

Heavy metal contamination of Lake George (Uganda) and its wetlands

et al. 1995

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“…The lakeward edges of the swamps are fringed by Vossia cuspidata (Roxb.) Griff., an emergent grass, and a community of euhydrophytes (a collective word for submerged, floating-leaved and bottom-rooted aquatic macrophytes ;Denny 1985c) Denny (1985b). Lake Victoria is fresh, alkaline and eutrophic (LVEMP 2002).…”

Section: Study Sitementioning

confidence: 99%

“…Griff., an emergent grass, and a community of euhydrophytes (a collective word While swamp vegetation is a dominant feature of the lake's shoreline accounting for over 95% of vegetated area, some margins have no swamps but feature other shoreline plants, mainly the reed Phragmites mauritianus Kunth, the leguminous shrub Sesbania sesban L. and the rhizomatous, low-growing perennial grass Panicum subalbidum Kunth. More detailed descriptions of the shoreline vegetation can be obtained from Lind & Morrison (1974) and Denny (1985b). Lake Victoria is fresh, alkaline and eutrophic (LVEMP 2002).…”

Section: Study Sitementioning

confidence: 99%

Shoreline vegetation distribution in relation to wave exposure and bay characteristics in a tropical great lake, Lake Victoria

Azza¹,

Koppel

Denny

et al. 2007

J. Trop. Ecol.

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Abstract:We investigated the presumption that wind-wave exposure is a major regulator of vegetation distribution within lakes. Along a 675-km stretch of shore in northern Lake Victoria (Uganda), the pattern of vegetation distribution in relation to shoreline features, and the variation of shoreline swamp area along a gradient of wave exposure were examined. The ability of wave exposure, when combined with bay morphometric characteristics, to predict the lakeward limit of vegetation distribution was assessed. Data were collected through a shoreline survey and from maps. Maximum effective fetch, computed from topographic maps, was used as a surrogate for wave exposure. Our results reinforce and amplify the notion that wave exposure is an important regulator of the within-lake distribution of vegetation. We found shoreline plants to either occupy stretches of shore shielded by coastal islands or hidden by convolutions of the lake margin. The area of shoreline swamps declined exponentially with increasing wave exposure. Of the coastal characteristics examined, bay area had the strongest influence on the lakeward expansion of vegetation. Wave exposure acting together with bay area, accounted for 64.4% of the variance in the limit of lakeward vegetation advancement.

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“…Besides maintaining the nutrient cycles, they efficiently remove minerals from the nutrient sediment pool, thus combating pollution. A variety of benefits are ascribed to fringing emergent plants as run‐off buffers from the surrounding agricultural land use, particularly for nutrient removal (Denny 1985). Thus, the conservation potential of macrophytes, an integral part of the wetland ecosystem, and their role as bio‐indicators of pollution need to be addressed. Water level fluctuations not only affect the density of avifauna but also cause dramatic shifts in their composition, particularly during floods, by damaging their breeding and nesting sites.…”

Section: Measures For Eco‐restorationmentioning

confidence: 99%

The environmental status of a Kashmir Himalayan wetland game reserve: Aquatic plant communities and eco‐restoration measures

Khan¹,

Shah

Mir

et al. 2004

Lakes & Reservoirs

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The data (November 2000 -October 2001 are presented on environmental status, hydrology, sedimentation rate, water quality and macrophytic community architecture of an important game reserve (Hokersar Wetland) in the Kashmir Himalayan valley. Of the total water input, 91% was contributed from surface inlets and just 9% through precipitation. Of the total surface water output, 67% occurred through outlets while evapotranspiration and other losses accounted for 33%. The net annual sediment accumulation was principally a function of suspended load carried by Doodganga inlet. The ecosystem supports diverse aquatic plant communities (emergents, rooted-floating leaf type, free-floating leaf type, submersed type) marked by striking variability in composition, frequency and extent of colonization. Several ecological factors, such as habitat loss related to siltation, pollution, expanding agricultural activities and drastic hydrological fluctuations, have induced considerable changes in the dynamics and distribution pattern of sustained biota. The shift in macrophytic community structure is evidenced by the decline of Nelumbio nucifera and the near-disappearance of some economically important plants ( Euryale ferox , Acorus calamus ). The shrinkage of the wetland area, once spread over 1800 ha, by Ϸ 28% is a cause for environmental concern. The paper highlights the rapidly deteriorating environmental status of the Kashmir Himalayan Hokersar Wetland game reserve and stresses the need for its urgent ecological restoration.

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Submerged and floating-leaved aquatic macrophytes (euhydrophytes)

Cited by 12 publications

References 41 publications

Heavy metal contamination of Lake George (Uganda) and its wetlands

Heavy metal contamination of Lake George (Uganda) and its wetlands

Shoreline vegetation distribution in relation to wave exposure and bay characteristics in a tropical great lake, Lake Victoria

The environmental status of a Kashmir Himalayan wetland game reserve: Aquatic plant communities and eco‐restoration measures

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