Results 141 to 150 of about 1,406 (181)

Submerged macrophytes height estimation by echosounder data sample

2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
Traditional methods of submerged aquatic vegetation (SAV) survey last long and then, they are high cost. Optical remote sensing is an alternative, but it has some limitations in the aquatic environment. The use of echosounder techniques is efficient to detect submerged targets.
Luiz Henrique da Silva Rotta, Nilton Nobuhiro Imai   +1 more
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Maximum growing depth of submerged macrophytes in European lakes

Hydrobiologia, 2012
Submerged macrophytes are important elements for the structure and functioning of lake ecosystems. In this study, we used chemical and maximum colonisation depth (C_max) data from 12 European countries in order to investigate how suitable C_max may describe the impact by eutrophication.
Søndergaard, M., G. Phillips, S. Hellsten, A. Kolada, F. Ecke, H. Mäemets, M. Mjelde, M.M. Azzella, A. Oggioni.   +9 more
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Radiative Transfer in Submerged Macrophyte Canopies

2001
Abstract : The goals of this study are to develop models of radiative transfer for optically shallow waters with benthic substrates colonized by submerged aquatic vegetation (SAV). The models will enable prediction of upward spectral radiation from the seafloor, thereby permitting (i) the use of optical remote sensing to retrieve bathymetry, (ii) the ...
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[Effects of sediments on submerged macrophytes growth].

Ying yong sheng tai xue bao = The journal of applied ecology, 2007
With mesocom experiment, this paper studied the effects of different sediments (sandstone, clay and mud) in Taihu Lake of China on the growth of four submerged macrophytes Vallisneria natans, Potamogeton malaianus, Hydrilla verticillata, and Ceratophyllum demersum. The results showed that among the test sediments, mud was more available.
Kaining, Chen, Xiaofeng, Chen, Weimin, Chen, Ensheng, Liu, Cejie, Lan, Hai, Xu   +5 more
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Photosynthetic characteristics of the submerged macrophyte Ceratophyllum demersum

Physiologia Plantarum, 1986
The photosynthetic and growth characteristics of Ceratophyllum demersum L. were investigated under laboratory conditions which simulated those encountered in the plants' normal environment. The carbon fixation rate of C. demersum measured with 14C at light and carbon saturation at pH 8.0 was 4.48 mg C (g ash‐free dry weight)−1 h−1. It was lower at pH 6.
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Microprofiles of oxygen in epiphyte communities on submerged macrophytes

Marine Biology, 1985
Microprofiles of oxygen were measured by 2- to 10-μm diameter microelectrodes within 0.2- to 2.0-mm thick epiphyte layers on different marine and freshwater macrophytes during artificial light-dark cycles. The epiphyte community created large fluctuations in oxygen concentrations at the macrophyte surface by increasing the thickness of the layer around
Jensen, Kaj Sand, Revsbech, Niels Peter, Jørgensen, Bo Barker   +2 more
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Effects of Motor Boats on Submerged Aquatic Macrophytes

Lake and Reservoir Management, 1997
ABSTRACT Excluding motor boats from small experimental plots in a lake with heavy boat traffic significantly increased macrophyte biomass, coverage, and shoot height compared to impacted areas. Lakes across the country are increasingly threatened by overuse, particularly involving more and larger motor boats.
Timothy R. Asplund, Chad M. Cook
openaire   +1 more source

Effect of Bisphenol A on submerged-floating macrophytes and epiphytic biofilms

Plant Physiology and Biochemistry
Bisphenol A (BPA), a representative environmental endocrine disruptor, is widely detected in aquatic systems, posing potential risks to ecosystems and human health. However, the effects of BPA on submerged-floating macrophytes and their epiphytic biofilms remain poorly understood.
Qi Li, Rulan Zhang, Yunxing Xiao, Xin Jiang, Mengmeng Liu, Ningfei Lei, Yixia Yang   +6 more
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Dynamics of submerged macrophyte populations in response to biomanipulation

Freshwater Biology, 2001
1. A 6‐year study (1992–97) of changes in submerged vegetation after biomanipulation was carried out in the eutrophicated Lake Finjasjön, Southern Sweden. Ten sites around the lake were revisited each year. At each site five samples of above‐ground biomass were taken at 10 cm water depth intervals. An investigation of the seed bank at the 10 sites, and
John A. Strand, Stefan E. B. Weisner
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Variation in growth rates of submerged rooted macrophytes

Aquatic Botany, 1991
Abstract Above-ground growth rates of 14 temperate, submerged freshwater macrophytes were measured in the laboratory at high dissolved inorganic carbon levels (3.3-3.8 mM), nutrient saturation and photon flux densities (phoosynthetically active radiation (PAR) of 14.4 mol m−2 day−1 at 15°C. Growth rates ranged from 0.007 to 0.109 day−1, corresponding
Nielsen, S.L., Sand-Jensen, Kaj
openaire   +1 more source