Biometric Relationships and Evaluation of the Density of Tagelus angulatus Gray, 1847 (Mollusca, Solecurtidae) on the West African Coasts in Three Villages of the Community Protected Area of Urok, Guinea-Bissau

Aims: This study aimed to examin the biometric relationships, size frequencies and density of Tagelus angulatus in the Community Marine Protected Area of the Bijagós Islands of Guinea Bissau. Methodology: Sampling was carried out in three villages (Formosa, Nago and TChediã) of the Community Marine Protected Area. A total of 1596 individuals were collected. On each mudflat, four random transects 30 m apart and oriented from the shore to the sea were established. On each transect, individuals of Tagelus angulatus were collected on 6 plots of 1m² that were separated by 10 m. Results: The length of the individuals sampled ranged from 12 mm to 69 mm in all three of the villages studied with an average length of 48.65 ± 9.53 mm and a main mode equal to 53 mm. The results showed a positive allometry. The length and width of the species are also strongly correlated. The mean density for all three villages was 16.63 individuals. Conclusion: Management of the shellfish industry generally requires the knowledge and use of biometric relationships to translate data collected in the field into indicators that can be used for the development of management plans. This study provided knowledges on biometric relationships and density of Tagelus angulatus

Production d’alevins de Tilapia (Oreochromis niloticus) avec 3 aliments à base de sous-produits agro-industriels au Nord du Sénégal

L’étude a été réalisée dans un étang de la station piscicole de Richard TOLL au Nord du Sénégal entre 2013 et 2014. Elle a permis de tester la performance de deux aliments à base de sous-produits agro industriels locaux (A1 et A2) à un aliment (A3) importé de la Chine sur la croissance des alevins de tilapia (Oreochromis niloticus) du fleuve Sénégal. Les qualités nutritionnelles des aliments A1, A2 et A3 sur la croissance et le taux de mortalités des alevins sont déterminés pour chaque aliment. La méthodologie est accentuée sur la mesure des paramètres physico-chimiques, le suivi de la croissance des alevins et le test en triplicata de ces trois aliments dans des appas de 2m3. Les résultats obtenus ont montré que l’aliment A2 a donné les meilleures performances que l’aliment A1 avec des croissances moyennes individuelles respectives de 0,21±0,04g/j et 0,12±0,03g/j. Les gains de poids moyens et taux de conversion alimentaire sont respectivement 3,09±0,53g et 1,79±0,26 g pour l’aliment A2 et 1,82±0,45g et 1,64±0,01 g pour l’aliment A1. Statistiquement, les résultats obtenus avec l’aliment A2 ne sont pas différents de ceux obtenus avec l’aliment A3 importé de la Chine.© 2015 International Formulae Group. All rights reserved.Mots clés: Alevins, Oreochromis niloticus, aliment, croissance, performanceEnglish Title:  Production of young Tilapia fish (Oreochromis niloticus) with 3 foods containing under agroindustrial products in the North of SenegalEnglish AbstractThe study was carried out in a pond of the piscicultural station of Richard-TOLL in the North of Senegal between 2013 and 2014. It allowed to test the performance of two food containing local agro industrial by-products (A1 and A2) with a food (A3) imported from China for the growth of young tilapias fish (Oreochromis niloticus) of the Senegal river. Nutritional qualities of the food A1, A2 and A3 on the growth and the death rate of young fish were given for each food. The methodology emphasized on the measure of the physicochemical parameters, the follow-up of the growth of young fish and the test in triplicate of these three food in grabbed of 2 m3.The results obtained showed that A2 food gave the best performances than A1 food with the respective average individual growths of 0, 21±0,04 g/j and 0,12±0,03 g/j. The mean gain of weight and food conversion rate are respectively 3,09±0,53 G and 1,79±0,26 G for A2 food and 1,82±0,45 G and  1,64±0,01 G for A1 food. Statistically analysed, the results obtained with the A2 food are not different from those obtained with the A3 food imported from China.© 2015 International Formulae Group. All rights reserved.Keywords: Fry, Oreochromis niloticus, food, growth, performanc

Evaluation of Water Resources Quality in Sabodala Gold Mining Region and Its Surrounding Area (Senegal)

peer reviewedGeochemical and Geostatistical tools were used to assess: 1) the chemical quality and, geochemical processes in crystalline rock aquifers in Sabodala (Eastern Senegal) and its surroundings and 2) the impact of mining activities on their quality. A total of 26 water samples collected at boreholes, dug wells and stream, were analyzed to determine major and trace elements concentration focused on elements that represent more threats on human health. Boxplots define chemical characteristics of water for each aquifer formation compared to surface waters. Geostatistical analysis show two sources of water mineralization with regard to major elements: a first natural source characterized by Ca-Mg-HCO3 water type from boreholes and unpolluted surface water and a second group characterized by polluted water by nitrates with Na-NO3-Cl type mainly observed in upper weathered aquifers. However, considering trace element, geostatistical analysis showed three water groups: water with very low trace element concentrations encountered in boreholes and unpolluted surface waters, and waters with relatively high trace element concentrations such as Al observed in areas affected by gold mining activities and finally, polluted waters by Ni, Co, Mn and Cr observed at Sabodala. Results show that in eastern Senegal well waters are vulnerable and often affected by pollution

Malaria Transmission Pattern in an Area Selected for Clinical Trials in the Sudanian Area of Senegal (West Africa)

Malaria transmission pattern was studied in 3 villages (Toubanding, Daga Ndoup, and Keur Samba Guèye) situated within an area selected for clinical trials. The study was conducted in the rainy season from July to December 2011. The main objective of this work was to gather baseline data on malaria transmission intensity and other entomological parameters before the advent of clinical trials. Mosquitoes were collected by Human-Landing Collections (HLCs) and by pyrethrum spray catches (PSCs). Five anopheline species were collected, namely, An. arabiensis, An. gambiae, An. funestus, An. pharoensis, and An. rufipes, giving a heterogeneous distribution within the study area. The populations dynamics of the vectors varied temporarily in each village depending on the pattern of the rainy season. Transmission intensity estimated by the entomological inoculation rate (EIR) was measured in each of the three villages with the variations linked to the microecological differences between the villages. Measurements were calculated for August, September, and October and were found to vary between 4 and 30 infected bites per person over the study period with a peak intensity observed in September. These results indicate that epidemiological field trials on malaria could be conducted in this area on the basis of the differences observed with transmission intensity, micro-ecological variations, and the objectives of the trials

Pronalazak nametnika Myxobolus episquamalis (Myxozoa, Myxobolidae) kod cipla glavaša, Mugil cephalus (Pisces, Teleostei, Mugilidae) u Senegalskom priobalju (istočni tropski Atlantik)

Myxobolus episquamalis (Myxozoa, Myxobolidae), a myxosporidian parasite, was found for the first time infecting scales and fins of flathead mullet (Mugil cephalus) from the Senegalese coast. The overall prevalence of infection was 4.7% (25/529), while the highest infection rates were observed in January 2006 (17.1%) and July 2006 (13.9%). This parasite forms large and white cysts which cover a great part of the fish body. According to this new report from African Atlantic coast, Myxobolus episquamalis geographical distribution is extended considerably. However, the infection is of little commercial importance and does not cause a significant economic loss in Senegal.Myxobolus episquamalis (Myxozoa, Myxobolidae), mikrosporidijski nametnik, pronađen je po prvi put u cipla glavaša (Mugil cephalus) u senegalskom priobalju. Sveukupna prevalencija infekcije iznosila je 4.7% (25/529), dok je najveća stopa infekcije zabilježena u siječnju (17.1%) i srpnju (13.9%) 2006 godine. Ovaj nametnik stvara velike bijele ciste koje pokrivaju veliki dio tijela ribe. Prema ovom nalazu s afričke obale Atlantika, njegova zemljopisna rasprostranjenost je znatna. Ipak, infekcija nema veći gospodarski značaj tj. ne uzrokuje značajan ekonomski gubitak u ribarstvu Senegala

Contribution to the Study of the Size Structure, the Length-Weight Relationship, the Condition Factor and the Sex-ration of Shrimp Farfantepenaeus notialis (Pérez Farfante, 1967) in the Estuary of Sine-Saloum (Senegal)

This study was carried out within the context of USAID/COMFISH project for establihing a biological data base for some fish species including shrimp Farfantepenaeus notialis to support management plans for these species. This study on Farfantepenaeus notialis in the Sine-Saloum estuary revealed that the sampled individuals are relatively small sizes.The average cephalothoracic sizes are less than 20 mm at Bettenty (male = 18.0 ± 2.9; female=18.5 ± 3.9) and at Foundiougne (male = 17.6 ± 2.9; female = 18.5 ± 3.8). The allometric rate «b» is more important at Bettenty (b = 2.94) than at Foundiougne (b = 2.75) and condition factor K is higher during the hot season in both locations (Bettenty: K = 0.80 in hot season; K = 0.78 in cold season; Foundiougne: K = 0.82 in hot season, K = 0.75 in cold season). The sex ratio of Farfantepenaeus notialis is in favor of females at Bettenty (54.6%) and at Foundiougne (51.2%). The size classes show that below 15 mm and beyond 20 mm, the number of female is higher than that of male. Beween 15 to 20 mm, male are higher.

Obstacles to integrated pest management adoption in developing countries

Despite its theoretical prominence and sound principles, integrated pest management (IPM) continues to suffer from anemic adoption rates in developing countries. To shed light on the reasons, we surveyed the opinions of a large and diverse pool of IPM professionals and practitioners from 96 countries by using structured concept mapping. The first phase of this method elicited 413 open-ended responses on perceived obstacles to IPM. Analysis of responses revealed 51 unique statements on obstacles, the most frequent of which was “insufficient training and technical support to farmers.” Cluster analyses, based on participant opinions, grouped these unique statements into six themes: research weaknesses, outreach weaknesses, IPM weaknesses, farmer weaknesses, pesticide industry interference, and weak adoption incentives. Subsequently, 163 participants rated the obstacles expressed in the 51 unique statements according to importance and remediation difficulty. Respondents from developing countries and high-income countries rated the obstacles differently. As a group, developing-country respondents rated “IPM requires collective action within a farming community” as their top obstacle to IPM adoption. Respondents from high-income countries prioritized instead the “shortage of well-qualified IPM experts and extensionists.” Differential prioritization was also evident among developing-country regions, and when obstacle statements were grouped into themes. Results highlighted the need to improve the participation of stakeholders from developing countries in the IPM adoption debate, and also to situate the debate within specific regional contexts

Ecology of Phlebotomine Sand Flies in the Rural Community of Mont Rolland (Thiès Region, Senegal): Area of Transmission of Canine Leishmaniasis

BACKGROUND: Different epidemiological studies previously indicated that canine leishmaniasis is present in the region of Thiès (Senegal). However, the risks to human health, the transmission cycle and particularly the implicated vectors are unknown. METHODOLOGY/PRINCIPAL FINDINGS: To improve our knowledge on the population of phlebotomine sand flies and the potential vectors of canine leishmaniasis, sand flies were collected using sticky traps, light traps and indoor spraying method using pyrethroid insecticides in 16 villages of the rural community of Mont Rolland (Thiès region) between March and July 2005. The 3788 phlebotomine sand flies we collected (2044 males, 1744 females) were distributed among 9 species of which 2 belonged to the genus Phlebotomus: P. duboscqi (vector of cutaneous leishmaniasis in Senegal) and P. rodhaini. The other species belonged to the genus Sergentomyia: S. adleri, S. clydei, S. antennata, S. buxtoni, S. dubia, S. schwetzi and S. magna. The number of individuals and the species composition differed according to the type of trap, suggesting variable, species-related degrees of endophily or exophily. The two species of the genus Phlebotomus were markedly under-represented in comparison to the species of the genus Sergentomyia. This study also shows a heterogeneous spatial distribution within the rural community that could be explained by the different ecosystems and particularly the soil characteristics of this community. Finally, the presence of the S. dubia species appeared to be significantly associated with canine leishmaniasis seroprevalence in dogs. CONCLUSIONS/SIGNIFICANCE: Our data allow us to hypothesize that the species of the genus Sergentomyia and particularly the species S. dubia and S. schwetzi might be capable of transmitting canine leishmaniasis. These results challenge the dogma that leishmaniasis is exclusively transmitted by species of the genus Phlebotomus in the Old World. This hypothesis should be more thoroughly evaluated

Complexité attributionnelle et exactitude des attributions : appréciation du modèle de perception du leadership en Afrique sub-saharienne

This thesis proposes an empirical test of the leadership attribution model based on the observation of leader-subordinate dyads in Senegal and France. This model focuses on key constructs such as attributional complexity and leader attribution accuracy, resulting behaviors, mediating variables such as subordinate satisfaction, performance corrective strategies, and outcome variables such as leadership perceptions. The model is tested using hierarchical regressions of direct effects and mediating effects of biased allocations. Our intention is to test the relationships from a sample of auditors in continuingeducation of higher education (in Senegal and France) and to determine according to our model and our research hypotheses, which constructs contribute the most to explain the attributional complexity of the leaders. This leads us to study the direct influence of the accuracy of the attributions, the effect of the corrective strategies and the satisfaction of the subordinates on the perception of the leadership. We will also test the role of biased assignments on the two mediating variables. Hypotheses are strongly corroborated. The attributional complexity of leaders is linked to the accuracy of their attributions, as perceived by their subordinates. The performance correction strategies developed by leaders have beenlinked to accurate attribution and then to key outcome variables. We analyze the results as well as the limits and future directions of the research. The managerial contributions are twofold: on the one hand, to take into account in the process of recruiting leaders their ability to adopt a complex attributional approach and, on the other hand, to train them to better support their subordinates.Cette thèse propose un test empirique du modèle d’attribution du leadership basé sur l’observation de dyades leader-subordonné au Sénégal et en France. Ce modèle se concentre sur des construits essentiels comme la complexité attributionnelle et l’exactitude des attributions des leaders, les comportements qui en résultent, les variables médiatrices comme la satisfaction des subordonnés, les stratégies correctives de la performance et les variables de résultat comme les perceptions du leadership. Le modèle est testé à l’aide de régressions hiérarchiques des effets directs et des effets médiateurs des attributions biaisées. Notre intention est de tester les relations à partir d’un échantillon d’auditeurs en formation continue de l’enseignement supérieur (au Sénégal et en France) et de déterminer selon notre modèle et nos hypothèses de recherche, quels construits contribuent le plus à expliquer la complexité attributionnelle des leaders. Cequi nous amène à étudier l’influence directe de l’exactitude des attributions, l’effet des stratégies correctives et de la satisfaction des subordonnés sur la perception du leadership. Nous testerons aussi le rôle des attributions biaisées sur les deux variables médiatrices. Les hypothèses sont fortement corroborées. La complexité attributionnelle des leaders est liée à l’exactitude de leurs attributions, telle qu’elle est perçue par leurs subordonnés. Les stratégies de correction de la performance élaborées par les leaders se sont révélées liées à des attributions exactes, puis à des variables clés de résultats. Nous analysons les résultats ainsi que les limites et les orientations futures de la recherche. Les contributionsmanagériales sont doubles : d'une part, de prendre en compte dans le processus de recrutement des leaders leur aptitude à adopter une approche attributionnelle complexe et, d'autre part, les former afin de mieux accompagner leurs subordonnés

Attributional complexity and accuracy of attributions : assessment of the leadership perception model in Sub-Saharan Africa

Cette thèse propose un test empirique du modèle d’attribution du leadership basé sur l’observation de dyades leader-subordonné au Sénégal et en France. Ce modèle se concentre sur des construits essentiels comme la complexité attributionnelle et l’exactitude des attributions des leaders, les comportements qui en résultent, les variables médiatrices comme la satisfaction des subordonnés, les stratégies correctives de la performance et les variables de résultat comme les perceptions du leadership. Le modèle est testé à l’aide de régressions hiérarchiques des effets directs et des effets médiateurs des attributions biaisées. Notre intention est de tester les relations à partir d’un échantillon d’auditeurs en formation continue de l’enseignement supérieur (au Sénégal et en France) et de déterminer selon notre modèle et nos hypothèses de recherche, quels construits contribuent le plus à expliquer la complexité attributionnelle des leaders. Cequi nous amène à étudier l’influence directe de l’exactitude des attributions, l’effet des stratégies correctives et de la satisfaction des subordonnés sur la perception du leadership. Nous testerons aussi le rôle des attributions biaisées sur les deux variables médiatrices. Les hypothèses sont fortement corroborées. La complexité attributionnelle des leaders est liée à l’exactitude de leurs attributions, telle qu’elle est perçue par leurs subordonnés. Les stratégies de correction de la performance élaborées par les leaders se sont révélées liées à des attributions exactes, puis à des variables clés de résultats. Nous analysons les résultats ainsi que les limites et les orientations futures de la recherche. Les contributionsmanagériales sont doubles : d'une part, de prendre en compte dans le processus de recrutement des leaders leur aptitude à adopter une approche attributionnelle complexe et, d'autre part, les former afin de mieux accompagner leurs subordonnés.This thesis proposes an empirical test of the leadership attribution model based on the observation of leader-subordinate dyads in Senegal and France. This model focuses on key constructs such as attributional complexity and leader attribution accuracy, resulting behaviors, mediating variables such as subordinate satisfaction, performance corrective strategies, and outcome variables such as leadership perceptions. The model is tested using hierarchical regressions of direct effects and mediating effects of biased allocations. Our intention is to test the relationships from a sample of auditors in continuingeducation of higher education (in Senegal and France) and to determine according to our model and our research hypotheses, which constructs contribute the most to explain the attributional complexity of the leaders. This leads us to study the direct influence of the accuracy of the attributions, the effect of the corrective strategies and the satisfaction of the subordinates on the perception of the leadership. We will also test the role of biased assignments on the two mediating variables. Hypotheses are strongly corroborated. The attributional complexity of leaders is linked to the accuracy of their attributions, as perceived by their subordinates. The performance correction strategies developed by leaders have beenlinked to accurate attribution and then to key outcome variables. We analyze the results as well as the limits and future directions of the research. The managerial contributions are twofold: on the one hand, to take into account in the process of recruiting leaders their ability to adopt a complex attributional approach and, on the other hand, to train them to better support their subordinates