Fertility and Disturbance Gradients: A Summary Model For Riverine Marsh Vegetation

Day, Richard T.; Keddy, Paul A.; McNeill, John; Carleton, T. J.

doi:10.2307/1941260

Cited by 247 publications

(193 citation statements)

References 36 publications

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“…Kumar and Pandit (2008) while studying the effect of water level fluctuations on distribution of emergent vegetation in Hokersar wetland (Kashmir) maintained that water depth plays an important role in the presence, distribution and diversity of the emergent species. Day et al (1988), however, found that water depth, the effects of spring flooding in removing litter and the fertility gradient produced by flowing water are the three main factors affecting vegetation composition.…”

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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Section: Hydrological Variationsmentioning

confidence: 99%

Factors affecting the distribution patterns of aquatic macrophytes

Pandit

Ganai

2014

Limnological Review

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“…The relative importance of local habitat factors in explaining the low plant species richness in regulated rivers is not clear, because knowledge of how natural fluctuations in flow and water level affect lakeshore and riverbank vegetation (e.g. van der Valk 1981, Keddy 1983, Nilsson 1987, Day et al 1988, Hughes 1990 may not be applicable outside the range of natural flows (but see Stevens et al [1995]). The floristic response to changes in water-level regime also depends on how sediment and litter dynamics (Hupp and Osterkamp 1985, Salo et al 1986, Nilsson and Grelsson 1990, Kalliola et al 1991, plant establishment (Fenner et al 1985, Rood and Mahoney 1990, Hughes 1994, and riparian water tables (Rood et al 1995) are affected.…”

Section: Toward a General Modelmentioning

confidence: 99%

“…River-margin communities, given their dependence on river hydrology (e.g., Day et al 1988, Hughes 1990, Gregory et al 1991, Naiman and Décamps 1997, inevitably change when river flow changes. However, the specific responses are difficult Manuscript received 24 November 1997;revised 9 November 1998;accepted 19 January 1999. to predict, because rivers are complex, dynamic ecosystems and river regulation changes hydrological and geomorphological as well as biological variables.…”

Section: Introductionmentioning

confidence: 99%

Effects of River Regulation on River-Margin Vegetation: A Comparison of Eight Boreal Rivers

Jansson¹,

Dynesius²,

Andersson³

2000

Ecological Applications

156

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Effects of river regulation on river-margin vegetation: a comparison of eight boreal rivers. Abstract. Regulation and fragmentation by dams belong to the most widespread deliberate impacts of humans on the world's rivers, especially in the Northern Hemisphere. We evaluated the effects of hydroelectric development by comparing the flora of vascular plants in 200-m-long reaches of river margin distributed along eight entire rivers in northern Sweden. Four of these rivers were free-flowing, and four were strongly regulated for hydroelectric purposes. First, we compared species diversity per site between entire freeflowing and regulated rivers. To reduce the effects of natural, between-river variation, we compared adjacent rivers. One regulated river had lower plant species richness and cover than two adjacent free-flowing ones, whereas two other parallel rivers, one regulated and another free-flowing, did not differ significantly. Second, river-margin vegetation responded differently to different types of regulated water-level regimes. Both along run-of-river impoundments, with small but daily water-level fluctuations, and along storage reservoirs, with large fluctuations between low water levels in spring and high levels in late summer and fall, the number of species and their cover per site were lower than along the freeflowing rivers. Regulated but unimpounded reaches were most similar to free-flowing rivers, having lower plant cover per site, but similar numbers of species. For reaches with reduced discharge, evidence was mixed; some variables were lower compared to free-flowing rivers whereas others were not. However, for the last two types of regulation, statistical power was low due to small sample sizes. Third, we classified all plant species according to their dispersal mechanisms and tested whether they respond differently to different types of regulated water-level regimes. Three out of four types of regulation had higher proportions of wind-dispersed species, and two out of four had lower proportions of species without specific mechanisms for dispersal, compared to free-flowing rivers, suggesting that dispersal ability is critical for persistence following regulation. Run-of-river impoundments had higher proportions of long-floating species and species with mechanisms for vegetative dispersal, suggesting that water dispersal may still be important despite fragmentation by dams. Fourth, plant species richness and cover varied with both local factors, such as water-level regime, and regional factors, such as length of the growing season. Presence of clay and silt in the river-margin soil, preregulation position of the contemporary river margin, nonreservoir sites, low altitudes, and long growing seasons were associated with high plant species richness and cover.

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“…The main reason lies in the severe competition pressure and drought stress in the steady condition. It had been recognized that not only the abiotic processes affected the plant distribution, but the interspecies competition played another important role (Grime, 1973;Keddy, 1985;Wilson and Keddy, 1986;Day et al, 1988;Keddy, 1989;Goldberg and Barton, 1992). The potential habitat range of a certain species may greatly surpass what has been observed in the natural conditions.…”

Section: Resultsmentioning

confidence: 99%

Modelling the riparian vegetation evolution due to flow regulation of Lijiang River by unstructured cellular automata

Chen

2010

Ecological Informatics

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a b s t r a c t a r t i c l e i n f o Keywords: Flow regulation Riparian vegetation Unstructured cellular automataThe flow regulation of rivers, mainly for flood control in wet season and water supply in dry season, dramatically altered the hydrological regime in the downstream, thus imposed significant impacts on the aquatic ecosystem. The evolution of riparian vegetation is an important indicator to quantify these impacts. This research focuses on the understanding of the vegetation dynamics and succession of riparian zones due to flow regulations by reservoir operation. The study developed an integrated model which couples a twodimensional hydrodynamics module with a vegetation evolution module. Owing to the ability to well present spatial heterogeneity and local interactions, the vegetation module applied a cellular automata approach. To more precisely describe the complex morphology and topography, and to improve computation efficiency, an unstructured cellular automata (UCA) scheme which implemented a triangular mesh was used. The developed model was applied to a typical compound channel of the Lijiang River, which has been largely affected by the flow regulations of the Qingshitan reservoir for navigation purpose. The model was calibrated by the historical vegetation data, the field observations and the controlling experiment data. Through the scenarios simulation, the effects of flow regulation on riparian vegetation dynamics were analyzed. In addition, the potentials of UCA in riparian vegetation modelling were well explored.

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Fertility and Disturbance Gradients: A Summary Model For Riverine Marsh Vegetation

Cited by 247 publications

References 36 publications

Factors affecting the distribution patterns of aquatic macrophytes

Factors affecting the distribution patterns of aquatic macrophytes

Effects of River Regulation on River-Margin Vegetation: A Comparison of Eight Boreal Rivers

Modelling the riparian vegetation evolution due to flow regulation of Lijiang River by unstructured cellular automata

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