An example of sedimentation and proper management of flushing operation since 45 years

Author(s):  
C Guilbaud ◽  
O Cazaillet ◽  
P Cochet ◽  
C Odeyer
Keyword(s):  
Animals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1071
Author(s):  
Zuzanna Plichta ◽  
Jarosław Kobak ◽  
Rafał Maciaszek ◽  
Tomasz Kakareko

An ornamental freshwater shrimp, Neocaridina davidi, is popular as an aquarium hobby and, therefore, a potentially invasive species. There is a growing need for proper management of this species to determine not only their optimum breeding conditions, but also their ability to colonise novel environments. We tested habitat preferences of colour morphs (brown, red, white) of N. davidi for substratum colour (black, white, grey shades, red) and fine or coarse chess-board patterns to recognise their suitable captivity conditions and predict their distribution after potential release into nature. We conducted laboratory choice experiments (n = 8) with three individuals of the same morph exposed for two hours to a range of backgrounds. Shrimp preferred dark backgrounds over light ones irrespective of their own colouration and its match with the background colour. Moreover, the brown and red morphs, in contrast to the white morph, preferred the coarse background pattern over the finer pattern. This suggests that the presence of dark, uniform substrata (e.g., rocks, macrophytes) will favour N. davidi. Nevertheless, the polymorphism of the species has little effect on its total niche breadth, and thus its invasive potential.


2021 ◽  
Vol 13 (5) ◽  
pp. 2958
Author(s):  
Cristinel Petrișor Constantin ◽  
Vasile Papuc-Damașcan ◽  
Andrei Blumer ◽  
Ruxandra-Gabriela Albu ◽  
Titus Suciu ◽  
...  

Visitors’ increasing interest in nature-based and cultural tourism, especially in the context of ecotourism destinations, has generated a heated debate in tourism literature. Some authors consider that ecotourism should be approached through a niche strategy rather than through mass marketing. Therefore, identifying the main characteristics of visitors to ecotourism destinations is very important in setting management and marketing strategies adapted to their specific needs. The present paper aims to identify the profile of visitors to Romanian ecotourism destinations, considering the ecotourism potential of this country and the scarcity of empirical studies on these types of destinations. To reach this aim, a survey was conducted in four Romanian ecotourism destinations. By computing the data collected from a sample of 1157 visitors, four visitor segments have been identified based on a single characteristic (visit purpose). Crosstabulation and Chi-square analysis were used in order to identify the profiles of these segments. The results reveal that most of respondents are nature travellers, followed by culture travellers. The findings may be used by ecotourism destination managers in order to target specific market segments and establish proper management and marketing strategies.


2014 ◽  
Vol 3 (4) ◽  
pp. 258-264 ◽  
Author(s):  
Georgios Geropapas ◽  
George Galyfos ◽  
Ioannis Stefanidis ◽  
Ioannis Stamatatos ◽  
Stavros Kerasidis ◽  
...  

2020 ◽  
Author(s):  
Md. Fazlul Awal Mollah

Abstract Bangladesh is rich in freshwater fish resources, with 260 indigenous and 13 exotic species. However, fish production from natural resources has declined due to overexploitation and lack of proper management over the last few decades. As a result, many species, including catfish that were once abundantly available, are facing the threat of extinction. Catfish in Bangladesh have potential for aquaculture. There are some 46 species of catfish in Bangladesh but non-availability of stockable-size fry has been identified as a major constraint towards their farming. However, seven species of catfish have been successfully induced to breed to propagate their seed under artificial conditions.


2021 ◽  
Vol 8 (3) ◽  
pp. 364-368
Author(s):  
Ishani Gupta ◽  
Rekha Rani ◽  
Jyotsna Suri

Oral cancer is one of a major health problem in some parts of the world especially in the developing countries. Oral cancer is the sixth most common cancer in the world whereas in India it is one of the most prevalent cancer. Oral cavity lesions are usually asymptomatic. Accurate diagnosis of the lesion is the first step for the proper management of patients and histopathology is considered as the gold standard. The objective is to study the different patterns of oral cavity lesions seen in a tertiary care hospital of Jammu: One year retrospective study. Post graduate department of pathology.: It was a retrospective study carried out in a tertiary care centre for a period of one year from March 2020 to Feb 2021. 148 cases of oral cavity lesions were included in this study. The parameters that were included in the study were sociodemographic data, site of the lesion, clinical features and histological diagnosis. Data collected was analysed.148 cases of oral lesions were identified during the period of study. The age of patients varied from 5 to 78years and Male to Female ratio was 2.2:1. Buccal mucosa (30%) was the most common site involved which was followed by tonsil (19%). Out of 148 cases 70 cases were malignant, 10 cases pre malignant and 21 cases were benign. Squamous cell carcinoma (33.7%) was the most common lesion present in our study. Oral cavity lesions have a vast spectrum of diseases which range from tumour like lesions to benign and malignant tumours. Our study concluded that squamous cell carcinoma was the most common malignant lesion of oral cavity. Histological typing of the lesion is important for confirmation of malignancy and it is essential for the proper management of the patient.


Author(s):  
Giovanna Bitonti ◽  
Nicolò Clemente ◽  
Anna Del Fabro ◽  
Paolo Manna ◽  
Monica Buttignol ◽  
...  

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