| Titre : | Hydrobiologia 415 - NOV 1999 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
H. Coops, Auteur ;
J. Hanganu, Auteur ;
M. Tudor, Auteur ;
W. Oosterberg, Auteur
The aquatic vegetation present in lakes in the delta of the River Danube was studied using field survey data and satellite image. Based on the spectral information from satellite images, three categories of lakes were distinguished: clear / macr[...]
Article
C. Fernandez-alaez, Auteur ;
M. Fernandez-alaez, Auteur ;
E. Becares, Auteur
The influence of water retention time and depth variation on the macrophyte community in two small shallow lakes in the northwest of Spain was studied. One lake is periodically flooded and the other deeper lake, which is usually inundated, dries[...]
Article
J. C. Costa, Auteur ;
J. Capelo, Auteur ;
M. D. Espirito Santo, Auteur ;
M. Lousa, Auteur ;
A. Monteiro, Auteur ;
S. Mesquita, Auteur ;
M. T. Vasconcelos, Auteur ;
I. Moreira, Auteur
The Portuguese Coastal Superdistrict (Western Portugal) is a transitional biogeographical unit between the Mediterranean and Eurosiberian Regions. Due to the multiple influences which impact on the region, a wealth of taxa are found there making[...]
Article
M. T. Ferreira, Auteur ;
A. Franco, Auteur ;
L. Catarino, Auteur ;
I. Moreira, Auteur ;
P. Sousa, Auteur
The establishment of algal mats in concrete irrigation channels presents a serious weed problem in Mediterranean areas. These periphytic growths can reach two meters in filament length, 20 cm in mat thickness, 100% cover and 1 kg of fresh weight[...]
Article
M. M. Ali, Auteur ;
K. J. Murphy, Auteur ;
V. J. Abernethy, Auteur
A series of models was developed using functionally-derived variables (mainly based on morphological attributes of freshwater macrophytes) to predict the trophic status of river and associated channel systems. The models were compared with an ex[...]
Article
J. Haury, Auteur ;
L. G. Aidara, Auteur
In order to quantify macrophyte cover and standing crop, studies were performed in a main river and two tributaries in Brittany. Species and total plant cover were assessed using a pin-point method over a period of nearly three years. Spring and[...]
Article
J. C. Costa, Auteur ;
J. Capelo, Auteur ;
M. D. E. Santo, Auteur ;
M. Lousa, Auteur ;
A. Monteiro, Auteur ;
S. Mesquita, Auteur ;
M. T. Vasconcelos, Auteur ;
I. Moreira, Auteur
The Portuguese Coastal Superdistrict (Western Portugal) is a transitional biogeographical unit between the Mediterranean and Eurosiberian Regions. Due to the multiple influences which impact on the region, a wealth of taxa are found there making[...]
Article
M. T. Ferreira, Auteur ;
I. S. Moreira, Auteur
River plants were studied at 119 sites from a southern Iberian river basin. A site length of 50-100 m was found to be adequate for characterising local plant richness in these rivers. Average number of river plant species per site was 48 (range [...]
Article
J. S. Oliveira, Auteur ;
J. Femandes, Auteur ;
C. Alves, Auteur ;
J. Morais, Auteur ;
P. Urbano, Auteur
In the frame of the research program EUREED (Effects of interaction between eutrophication and major environmental factors on the ecosystem stability of reed (Phragmites australis) vegetation in European land-water ecotones), three reed stands, [...]
Article
M. M. Ali, Auteur ;
K. J. Murphy, Auteur ;
J. Langendorff, Auteur
Multivariate analysis of data from a 1997 survey of submerged vegetation at 3 locations on the River Nile in Upper Egypt showed that hydrochemical factors (total oxidised nitrogen, sulphate and sodium) were the most important environmental varia[...]
Article
T. Vasconcelos, Auteur ;
M. Tavares, Auteur ;
N. Gaspar, Auteur
In 1997, in 50 surveys of irrigated rice fields (Oryza sativa L.), 47 species of vascular plants were recorded in 19 families. Most of the species belonged to the Gramineae and Cyperaceae families. Seven species of algae were found, mostly Hydro[...]
Article
M. L. Costa, Auteur ;
M. C. Santos, Auteur ;
F. Carrapico, Auteur
The aquatic pteridophyte Azolla, a small-leaf floating plant, which lives in symbiosis with a nitrogen fixing cyanobacteria, Anabaena azollae, was widespread throughout water channels and hydrographic basins of Portugal. Azolla is also the aim o[...]
Article
A. Monteiro, Auteur ;
I. Moreira, Auteur ;
E. Sousa, Auteur
The study evaluated the effect of prior plant cutting of common reed (Phragmites australis), during flowering, on the efficacy of isopropylamine and trimesium salts of glyphosate (2.9 and 2.6 kg a.i./ha, respectively) applied at two spray volume[...]
Article
I. Moreira, Auteur ;
A. Monteiro, Auteur ;
E. Sousa, Auteur
The efficacy of glyphosate and glufosinate applied with two sprayers, a motorised knapsack mistblower and a hydraulic sprayer, were evaluated for the control of common reed. Phragmites australis had been cut in the beginning of September 1994, 3[...]
Article
Alain Dutartre, Auteur ;
J. Haury, Auteur ;
A. Jigorel, Auteur
Located in western France, the Pen Mur dam of Muzillac (Morbihan) is mainly used for the production of drinking water and for fishing. Over the past few years, the upstream part of this eutrophic waterbody has been invaded by Egeria densa. To de[...]
Article
I. M. Calha, Auteur ;
C. Machado, Auteur ;
F. Rocha, Auteur
The first known case of herbicide resistance found in Portugal occurred in the aquatic environment: populations of Alisma plantago-aquatica have shown resistance to bensulfuron-methyl. A large survey was carried out in 1996, covering 81% of the [...]
Article
D. G. SanLeon, Auteur ;
J. Izco, Auteur ;
J. M. Sanchez, Auteur
Spartina patens (Gramineae) is an American coastal grass which grows in a wide range of coastal habitats in its native area. After it was discovered in some Galician wetlands two years ago, we undertook a regional survey whose preliminary result[...]
Article
I. Moreira, Auteur ;
T. Ferreira, Auteur ;
A. Monteiro, Auteur ;
L. Catarino, Auteur ;
T. Vasconcelos, Auteur
A historical insight into the connections between Portuguese researchers working on aquatic weeds and the EWRS Symposia (1964-1998) is given. A review is provided of the major aquatic weeds in Portuguese waters, including fluvial systems, reserv[...]
Article
I. Moreira, Auteur ;
T. Ferreira, Auteur ;
A. Monteiro, Auteur ;
L. Catarino, Auteur ;
T. Vasconcelos, Auteur
A historical insight into the connections between Portuguese researchers working on aquatic weeds and the EWRS Symposia (1964-1998) is given. A review is provided of the major aquatic weeds in Portuguese waters, including fluvial systems, reserv[...]
