Expansion of Myriophyllum spicatum (Eurasian water milfoil) into Lake Nasser, Egypt: Invasive capacity and habitat stability

Ali, M. M.; Soltan, Mohamed A.

doi:10.1016/j.aquabot.2005.11.002

Cited by 39 publications

(24 citation statements)

References 26 publications

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“…This species is considered to be among the most troublesome aquatic weed species worldwide and has been shown to form thick monospecific stands that reduce the relative abundance and richness of other species in North America and North Africa (Grace & Wetzel 1978, Aiken et al 1979, Buchan & Padilla 2000, Smith et al 2002, Ali & Soltan 2006. The dispersal and population expansion of M. spicatum occurs mainly via auto-fragments, i.e.…”

Section: Introductionmentioning

confidence: 99%

Growth response of the submerged macrophyte Myriophyllum spicatum to sediment nutrient levels and water-level fluctuations

Cao¹,

Wang²,

ZunLing³

2012

Aquat. Biol.

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Sediment nutrient levels and water-level fluctuations are important factors that affect the development and growth of submerged macrophytes; however, little is known about the adaptive responses of macrophytes to these factors. We conducted an experiment using the submerged macrophyte Myriophyllum spicatum L. grown under 2 sediment nutrient levels (high: 2.7 mg g −1 total nitrogen, TN; 1.5 mg g −1 total phosphorus, TP; low: 1.45 mg g −1 TN and 0.70 mg g −1 TP) and 3 amplitudes of water-level fluctuation (static, ± 50 cm, ±100 cm) in outdoor ponds. We hypothesized that increased nutrient supply would promote the growth of M. spicatum, which can acclimate to the negative effects of moderate water-level fluctuations. After 112 d of growth under high-nutrient conditions, the plants produced a greater shoot biomass (higher branch number and length), resulting in greater accumulation of total biomass. However, plant growth was inhibited by increasing the amplitude of the water-level fluctuations: at ±100 cm, the plants allocated more biomass to the roots and produced fewer and longer branches. Conversely, plant growth was promoted in the high-nutrient sediments at ± 50 cm amplitude. The production of auto-fragments was increased in the high-nutrient sediment but was significantly decreased by high water-level fluctuations. Thus, sediment nutrient levels and water-level fluctuations have strong interactive effects on the growth and reproduction of M. spicatum, and increased sediment nutrients in combination with moderate water level fluctuations facilitate nutrient acquisition, plant growth, and reproduction. Our study implies that moderate water-level fluctuations benefit the restoration of submerged macrophyte communities, particularly in high-nutrient habitats.

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Section: Introductionmentioning

confidence: 99%

Growth response of the submerged macrophyte Myriophyllum spicatum to sediment nutrient levels and water-level fluctuations

Cao¹,

Wang²,

ZunLing³

2012

Aquat. Biol.

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“…Although colonization success depends also upon habitat characteristics (Knapton and Petrie, 1999;Lonsdale, 1999;Ali and Soltan, 2006), species accidentally or intentionally introduced by humans often originate from distant areas (alien, exotic, or non-native species), and may rapidly get established. Although the mechanisms behind successful colonizations remain poorly known (e.g., Coleman and Levine, 2007), the establishment of invaders typically causes a decline in native species performance (Madsen et al, 1991;Corbin and D'Antonio, 2004).…”

Section: Introductionmentioning

confidence: 99%

Mass invasion of non-nativeElodea canadensisMichx. in a large, clear-water, species-rich Norwegian lake – impact on macrophyte biodiversity

Mjelde

Lombardo

Berge

et al. 2012

Ann. Limnol. - Int. J. Lim.

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-The impact of Elodea canadensis on aquatic macrophyte biodiversity in (Lake) Steinsfjord has been studied through extensive lake-wide surveys and photographic sampling. E. canadensis greatly expanded in Steinsfjord since its appearance in 1978 and still dominated the macrophyte community in 2004. The areal distribution of E. canadensis peaked within 6 years from invasion and has remained relatively stable since; however, stands no longer reach the water surface. E. canadensis significantly increased its depth range, but the cover-weighted mean depth remained unchanged, suggesting that 3-4 m is its optimal depth in Steinsfjord. Species richness has not changed significantly since the earliest survey in 1936-38. However, species composition has changed remarkably, from isoetid dominance in 1936-38 to a diverse community dominated by Najas flexilis in 1979-80 to a less diverse community dominated by E. canadensis in 2004, with Potamogeton berchtoldii and Myriophyllum alterniflorum as lake-wide subdominants. Regardless of their abundance at the onset of the E. canadensis invasion, taxa whose cover-weighted mean depth overlapped with E. canadensis's in 1979-80 greatly reduced their abundance in 2004, shifted to deeper or shallow water or disappeared from sampling stations. Our survey indicates that E. canadensis may be the reason for the decrease of N. flexilis, likely through depletion of CO 2 in the water column and reduced nutrients in sediments. The abilities to survive and grow in periodically exposed shallow areas, combined with minor herbivory by waterfowl, are likely important factors for the increase of M. alterniflorum in Steinsfjord's shallow waters.

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“…2A). Nitrogen is a key element for aquatic plants, which use nitrate as a nitrogen source (Bornette and Puijalon, 2011) and M. spicatum was related to with higher nitrate availability (Ali and Soltan, 2006).…”

Section: Gam Results and Environmental Factorsmentioning

confidence: 99%

The potential habitats of two submerged macrophytes,Myriophyllum spicatumandHydrilla verticillatain the river ecosystems, South Korea

Son

Cho

Lee

2017

Knowl. Manag. Aquat. Ecosyst.

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-We examined the environmental factors that characterize the habitats of two submerged macrophytes, Myriophyllum spicatum and Hydrilla verticillata, in South Korea using generalized additive models (GAMs). We performed a vegetation survey and measured water depth and water velocity from May to September, 2014September, -2015. Averaged water quality data from the Ministry of Environment's national water quality measurement network from January 2012 to October 2015 were used for modeling. Potential habitats of M. spicatum were linked with chlorophyll a, nitrate nitrogen, suspended solids, water temperature, water depth, and water velocity (deviance explained = 28.7%, accuracy = 74%). In the case of H. verticillata, electrical conductivity and suspended solids were key habitat factors (deviance explained = 23.4%, accuracy = 75%). Model results were highly consistent with observations and field data. Model performances were evaluated by the accuracy rate, the area under the receiver operating characteristic curve, the kappa value, and field verification, and were in generally good agreement. Few studies have evaluated the developed models using the independent field data. By understanding the environmental factors that characterize the habitats for submerged macrophytes, our results contribute to the development of conservation and management strategies for river ecosystems.Keywords: : Eurasian watermilfoil / Hydrilla / water condition / habitat suitability / generalized additive model Résumé -Les habitats potentiels de deux macrophytes submergés, Myriophyllum spicatum et Hydrilla verticillata dans les écosystèmes fluviaux, Corée du Sud. Nous avons examiné les facteurs environnementaux qui caractérisent les habitats de deux macrophytes submergés, Myriophyllum spicatum et Hydrilla verticillata, en Corée du Sud à l'aide de modèles additifs généralisés (GAMs). Nous avons effectué un relevé de la végétation et mesuré la profondeur et la vitesse de l'eau de mai à septembre 2014-2015. Les données moyennes sur la qualité de l'eau provenant du réseau national de mesure de la qualité de l'eau du ministère de l'Environnement pour la période de janvier 2012 à octobre 2015 ont été utilisées pour la modélisation. Les habitats potentiels de M. spicatum étaient liés à la chlorophylle a, au nitrate, aux solides en suspension, à la température de l'eau, à la profondeur et à la vitesse de l'eau (variance expliquée = 28,7 %, précision = 74 %). Dans le cas de H. verticillata, la conductivité électrique et les solides en suspension étaient des facteurs clés de l'habitat (variance expliquée = 23,4 %, précision = 75 %). Les résultats des modèles étaient très cohérents avec les observations et les données de terrain. Les performances du modèle ont été évaluées par le taux de précision, la surface sous la courbe caractéristique de fonctionnement du récepteur, la valeur kappa et la vérification sur le terrain, et elles ont été généralement bien concordantes. Peu d'études ont évalué des modèles élaborés à l'aide des données indépend...

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Expansion of Myriophyllum spicatum (Eurasian water milfoil) into Lake Nasser, Egypt: Invasive capacity and habitat stability

Cited by 39 publications

References 26 publications

Growth response of the submerged macrophyte Myriophyllum spicatum to sediment nutrient levels and water-level fluctuations

Growth response of the submerged macrophyte Myriophyllum spicatum to sediment nutrient levels and water-level fluctuations

Mass invasion of non-nativeElodea canadensisMichx. in a large, clear-water, species-rich Norwegian lake – impact on macrophyte biodiversity

The potential habitats of two submerged macrophytes,Myriophyllum spicatumandHydrilla verticillatain the river ecosystems, South Korea

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