Distribution and Abundance of Submerged Aquatic Vegetation and Trapa natans in the Hudson River Estuary**

Nieder, William C.; Barnaba, Eugenia; Findlay, Stuart E. G.; Hoskins, Susan B.; Holochuck, Nordica; Blair, Elizabeth A.

doi:10.2112/si45-150.1

Cited by 35 publications

(27 citation statements)

References 42 publications

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“…1 Location of the study sites (black circles and italic labels) in the freshwater tidal Hudson River in eastern New York, USA. The first letter of the site code gives the section of river (L lower, M middle, U upper), and the last two letters give the shore type (BH bulkhead, BR bedrock, CR cribbing, RO natural rock, RR riprap, SA sand) macrophytes Vallisneria americana (submersed) and Trapa natans (floating-leaved) are common (Nieder et al 2004). The fauna is dominated by species typical of warm fresh waters, although diadromous fishes (e.g., Alosa spp.)…”

Section: The Study Areamentioning

confidence: 99%

“…SAV beds could serve as a source of wrack, which is important to shore zone invertebrates and plants (e.g., Backlund 1945;Minchinton 2002), as well as serving directly as a source of fish and invertebrate colonists to nearby shore zones. We constructed an SAV index as the area of the nearest mapped bed of SAV (in m 2 ) divided by the squared distance to the bed (in m), using data described by Nieder et al (2004).…”

Section: Physical Variablesmentioning

confidence: 99%

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Biodiversity in Hudson River shore zones: influence of shoreline type and physical structure

et al. 2012

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The shore zones of the Hudson River, like those of many developed waterways, are highly varied, containing a mix of seminatural and highly engineered shores. Our goal was to document the biodiversity supported by different kinds of shore zones in the Hudson. We chose six common types of shore zones, three of them ''natural'' (sand, unconsolidated rock, and bedrock), and three of them engineered (riprap, cribbing, and bulkheads). We measured selected physical characteristics (shore zone width, exposure, substrate roughness and grain size, shoreline complexity) of three examples of each of these shore types, and also sampled communities of terrestrial plants, fishes, and aquatic and terrestrial invertebrates. Community composition of most taxa differed across shore types, and frequently differed between wide, sheltered shores and narrow, exposed shores. Alien plant species were especially well represented along engineered shores. Nevertheless, a great deal of variation in biological communities was not explained by our six-class categorization of shore zones or the physical variables that we measured. No single shore type supported the highest values of all kinds of biodiversity, but engineered shore zones (especially cribbing and bulkheads) tended to have less desirable biodiversity characteristics than ''natural'' shore zones.

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Section: The Study Areamentioning

confidence: 99%

Section: Physical Variablesmentioning

confidence: 99%

Biodiversity in Hudson River shore zones: influence of shoreline type and physical structure

et al. 2012

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“…The abundance and distribution of submerged macrophytes in river ecosystems are related to water quality conditions (Nieder et al, 2004), water depth, and water velocity (Sousa, 2011). We found that variables associated with water environmental factors were important determinants of the distributions of M. spicatum and H. verticillata, especially chlorophyll a, electrical conductivity, nitrate nitrogen, suspended solids, water temperature, water depth, and water velocity.…”

Section: Gam Results and Environmental Factorsmentioning

confidence: 85%

“…Submerged macrophytes play an important role as a producer in food webs, shelter and forage for other organisms, and as a water quality indicator (Nieder et al, 2004). In addition, submerged macrophytes produce oxygen in stagnant regions and prolong the hydrologic retention time for the removal of particulate nutrients (Nepf et al, 2007).…”

Section: Introductionmentioning

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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“…E. densa and L. major formed extensive dense stands (up to 4.17 km 2 ), with standing crops varying from 45 to 2785 tons of dry biomass per lake (from 0.05 to 6.18 kg DW m -2 ), which covered from 1.6 to 13.0% of the total surface of the lakes. In many areas, plant biomass and vegetated patches largely overpassed values reported for invasive free-floating plants (up to 2.5 kg DW m -2 and 2 km 2 ) (Center and Spencer, 1981;Nieder et al, 2004). Though echosounding surveys did not allow prospecting the full lake surface, it resulted to be a reliable method for delimiting the stand boundaries (Wells et al, 1997;Zajac, 2008).…”

Section: Plant Distributionmentioning

confidence: 92%

Effects of wind-induced sediment resuspension on distribution and morphological traits of aquatic weeds in shallow lakes

Bertrin¹,

Boutry²,

Jan³

et al. 2017

J Limnol

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The spread of invasive aquatic plants (i.e., aquatic weeds) requires a broader knowledge of the factors determining their settlement at the lake scale, in order to improve management practices and biomonitoring. Among hydrodynamic pressures, wave action might influence submerged vegetation distribution in shallow lakes and potentially engender modifications of plant morphological traits. We here report a field survey conducted between 2014 and 2015 in French Atlantic Lakes to assess the spatial distribution and biomass production of two rooted aquatic weeds, Egeria densa Planch. and Lagarosiphon major (Ridl.) Moss, in relation to wind-induced sediment resuspension, water depth and sedimentary features. Moreover, we explored the relation between plant morphological traits and hydrodynamic disturbance under in situ conditions. At the lake scale, E. densa and L. major formed extensive monospecific stands, and occurred in the same areas only at low biomass. Both monospecific and mixed stands preferentially developed in shallow-sheltered or deep-exposed areas. Plant morphological traits showed different patterns in function of sediment resuspension according to the species and the lake. The influence of resuspension was however not systematic, with many cases where morphological traits were not affected at all. Maximum stem length appeared to be the most correlated trait towards sediment resuspension. Moreover, we found a significant correlation between the biomass and the sedimentary organic matter, indicating an interaction between the organic substrate preference of the plants and the effect of the canopy on fine particles sedimentation. On the whole, we highlighted the link between plant distribution, phenotypic plasticity and sediment resuspension, with calm-water zones favouring the settlement of dense vegetated stands. Our study could thus contribute to improve prediction models for identifying suitable areas for potential colonization by aquatic weeds. Further research is needed to better understand the role played by hydraulic forces in structuring the habitats in shallow lakes.

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Distribution and Abundance of Submerged Aquatic Vegetation and Trapa natans in the Hudson River Estuary**

Cited by 35 publications

References 42 publications

Biodiversity in Hudson River shore zones: influence of shoreline type and physical structure

Biodiversity in Hudson River shore zones: influence of shoreline type and physical structure

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

Effects of wind-induced sediment resuspension on distribution and morphological traits of aquatic weeds in shallow lakes

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