Influence of germination time on juvenile performance of Phragmites australis on temporarily exposed bottoms—implications for the colonization of lake beds

Weisner, Stefan E. B.; Ekstam, Börje

doi:10.1016/0304-3770(93)90017-q

Cited by 45 publications

(23 citation statements)

References 23 publications

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“…These reedbeds have not reappeared with the increased annual range in water level probably because of: (1) the great within-years fluctuation in water level, which prevents new seeds from germinating and establishing (Weisner and Ekstam 1993) or the reedbed from maintaining itself in permanently flooded areas because of excessively high levels in summer; (2) grazing that prevents any installation above the water line. Stands of Phragmites were recorded in the field, but only in situations where they were protected from livestock, most often in dense copses of Salix.…”

Section: Emergent Reedbeclsmentioning

confidence: 93%

Responses of vegetation to a rise in water level at Kerkini Reservoir (1982–1991), a Ramsar site in northern Greece

Crivellì

Grillas

Lacaze

1995

Environmental Management

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/ The floodplain of the river Strymon at Kerkini (northern Greece) was transformed into an irrigation reservoir by the construction of a dam in 1932 and subsequently enlarged in 1982. The aims of this study were to quantify the changes occurring in the various habitat types following raising of the waterlevel and to assess the stability of the plant communities present at this Ramsar site. The current hydrological regime, which has been stable since 1986, is typified by an increase in mean annual reservoir level of 2.2 m and by an increase in the annual range in level of 1.3 m. Landsat (1980, 1981, 1984, 1986, and 1988) and SPOT (1990) satellite images show a decrease in the area of grassland and shallow water areas, the very rapid disappearance of reedbeds, the appearance of beds of Nymphaea and the disappearance of half the forest area.The flooded forest, dominated by Salix alba, is a key habitat contributing to the biological richness of this wetland of international importance. The decrease in the forested area will continue because of the death of standing trees, the absence of regeneration under the new regime, the felling of trees and grazing. Management could be undertaken to ensure the survival of forested habitat and reedbeds at Kerkini, but this would require that the authorities take into account nature conservation and the protected status of the site and not raise the water level again.Lake Kerkini in northern Greece is situated on the floodplain of the River Strymon, which was transformed into a reservoir in 1932 by the construction of a dam. This reservoir (original maximum capacity: 289 x 106 mS; Babajimopoulos and Antonopoulos 1990) was designed to provide irrigation water for cultivation (maize, rice, etc.) on the Serres plain downstream and also for flood control. As a result of siltation of the lake by sediment brought down by the River Strymon, the reservoir lost 61% of its storage capacity in 50 years (Klossas 1975). For this reason and to expand irrigated crops, a new, higher dam and new dykes were built and came into operation in 1982. In order to be able to evaluate the impact of this new water management on the wildlife and the habitat of this wetland, an assessment of the impact of the changes since 1982 has been undertaken.

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Section: Emergent Reedbeclsmentioning

confidence: 93%

Responses of vegetation to a rise in water level at Kerkini Reservoir (1982–1991), a Ramsar site in northern Greece

Crivellì

Grillas

Lacaze

1995

Environmental Management

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“…For establishment, seeds require wet soil that is not flooded above 1 cm, contains high nutrients, and has an open canopy (Haslam, 1971a). Early germination and establishment is important for P. australis seedling survival, as it allows shoots time to emerge above water and reach the light (Weisner and Ekstam, 1993). Long term inundation of seedlings will result in decreased survival, and this effect is enhanced by the presence of algae that can further hamper photosynthesis (Armstrong et al, 1999).…”

Section: Sexual Reproductionmentioning

confidence: 99%

Long-term effects of a Phragmites australis invasion on birds in a Lake Erie coastal marsh

Robichaud

Rooney

2017

Journal of Great Lakes Research

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“…Available studies of seedling establishment of emergent macrophytes indicate that wet bare bottoms represent the best conditions, combining wet, but not flooded substrate, and light indicating space free of competition (Hejný and Husák, 1978;Weisner and Ekstam, 1993;Ekstam et al, 1999). Accordingly, the middle eulitoral with only a partial cover of perennial emergent macrophytes offers the best space for seedling establishment.…”

Section: Limits To Generative Dispersalmentioning

confidence: 99%

Response of littoral macrophytes to water level fluctuations in a storage reservoir

Krolová

Čı́žková

Hejzlar

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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Lakes and reservoirs that are used for water supply and/or flow regulations have usually poorly developed littoral macrophyte communities, which impairs ecological potential in terms of the EU Water Framework Directive. The aim of our study was to reveal controlling factors for the growth of littoral macrophytes in a storage reservoir with fluctuating water level (Lipno Reservoir, Czech Republic). Macrophytes occurred in this reservoir only in the eulittoral zone i.e., the shoreline region between the highest and the lowest seasonal water levels. Three eulittoral sub-zones could be distinguished: the upper eulittoral with a stable community of perennial species with high cover, the middle eulittoral with relatively high richness of emergent and amphibious species present at low cover values, and the lower eulittoral devoid of permanent vegetation. Cover and species composition in particular sub-zones were primarily influenced by the duration and timing of flooding, followed by nutrient limitation and strongly reducing conditions in the flooded organic sediment. Our results stress the ecological importance of eulittoral zone in reservoirs with fluctuating water levels where macrophyte growth can be supported by targeted management of water level, thus helping reservoir managers in improving the ecological potential of this type of water bodies. RÉSUMÉ Réponse des macrophytes littoraux aux fluctuations du niveau d'eau dans un réservoir Mots-clés :Les lacs et réservoirs qui sont utilisés pour l'approvisionnement en eau et/ou les régulations d'écoulement ont généralement des communautés littorales de macrophytes peu développées, ce qui altère le potentiel écologique selon la directive européenne cadre sur l'eau. Le but de notre étude était de révéler les facteurs de contrôle de la croissance des macrophytes littoraux dans un réservoir avec un niveau d'eau fluctuant (Lipno, République tchèque). Les macrophytes ne sont pré-sents dans ce réservoir que dans la zone eulittorale i.e., la région du littoral entre les plus hauts et les plus bas niveaux d'eau saisonniers. Trois sous-zones eulittorales peuvent être distinguées : la eulittorale supérieure avec une communauté stable d'espèces pérennes avec un fort recouvrement, la eulittorale médiane avec Article published by EDP Sciences M. Krolová et al.: Knowl. Managt. Aquatic Ecosyst. (2013) 408, 07 une richesse relativement élevée d'espèces émergées et amphibies présentant des valeurs de couverture faible, et la eulittorale inférieure de végétation permanente. Couverture et composition des espèces, dans chaque sous-zone, sont principalement influencées par la durée et le moment des inondations, suivis par la limitation en nutriments et des conditions fortement réductrices dans les sédiments organiques inondés. Nos résultats soulignent l'importance écologique de la zone eulittorale dans des réservoirs à niveaux d'eau fluctuants, où la croissance des macrophytes peut être prise en compte par une gestion ciblée du niveau d'eau, ce qui aide les gestionnaires du réservoir à ...

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Influence of germination time on juvenile performance of Phragmites australis on temporarily exposed bottoms—implications for the colonization of lake beds

Cited by 45 publications

References 23 publications

Responses of vegetation to a rise in water level at Kerkini Reservoir (1982–1991), a Ramsar site in northern Greece

Responses of vegetation to a rise in water level at Kerkini Reservoir (1982–1991), a Ramsar site in northern Greece

Long-term effects of a Phragmites australis invasion on birds in a Lake Erie coastal marsh

Response of littoral macrophytes to water level fluctuations in a storage reservoir

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