Temporal dynamics of Chaoborus larvae (Diptera : Chaoboridae) in the tropical ecosystem (lake Ayamé I ; Côte d’Ivoire).

Chaoborus larvae are voracious predators of zooplankton able to change their specific composition and size structure. Thus they appear as competitors of fish. They also represent food for planktophage fish. The temporal dynamics of Chaoborus larvae was studied (from january to october 1997) in the fishery of Bakro (5°33’N and 3°15’W) situated in lake Ayamé I (Côte d’Ivoire). Two peaks of density were observed : the most pronouced in March (end of the major dry season) with 747 ind./m2, and another, less pronouced in June (end of the major rainy season), with 280 ind./m2. Differences between densities may well be explained by the advent of the rainy season which leads to a decline in trophic resources (zooplankton) and exposes Chaoborus larvae to predation by fish.Key-words : Chaoborus larvae, Dynamics, lake Ayamé I, Côte d’Ivoire,West Africa

Exploring perceptions of advertising ethics: an informant-derived approach

Whilst considerable research exists on determining consumer responses to pre-determined statements within numerous ad ethics contexts, our understanding of consumer thoughts regarding ad ethics in general remains lacking. The purpose of our study therefore is to provide a first illustration of an emic and informant-based derivation of perceived ad ethics. The authors use multi-dimensional scaling as an approach enabling the emic, or locally derived deconstruction of perceived ad ethics. Given recent calls to develop our understanding of ad ethics in different cultural contexts, and in particular within the Middle East and North Africa (MENA) region, we use Lebanon—the most ethically charged advertising environment within MENA—as an illustrative context for our study. Results confirm the multi-faceted and pluralistic nature of ad ethics as comprising a number of dimensional themes already salient in the existing literature but in addition, we also find evidence for a bipolar relationship between individual themes. The specific pattern of inductively derived relationships is culturally bound. Implications of the findings are discussed, followed by limitations of the study and recommendations for further research

A global agenda for advancing freshwater biodiversity research

This manuscript is a contribution of the Alliance for Freshwater Life (www.allianceforfreshwaterlife.org). We thank Nick Bond, Lisa Bossenbroek, Lekima Copeland, Dean Jacobsen, Maria Cecilia Londo?o, David Lopez, Jaime Ricardo Garcia Marquez, Ketlhatlogile Mosepele, Nunia Thomas-Moko, Qiwei Wei and the authors of Living Waters: A Research Agenda for the Biodiversity of Inland and Coastal Waters for their contributions. We also thank Peter Thrall, Ian Harrison and two anonymous referees for their valuable comments that helped improve the manuscript. Open access funding enabled and organised by Projekt DEAL

A global agenda for advancing freshwater biodiversity research

Global freshwater biodiversity is declining dramatically, and meeting the challenges of this crisis requires bold goals and the mobilisation of substantial resources. While the reasons are varied, investments in both research and conservation of freshwater biodiversity lag far behind those in the terrestrial and marine realms. Inspired by a global consultation, we identify 15 pressing priority needs, grouped into five research areas, in an effort to support informed stewardship of freshwater biodiversity. The proposed agenda aims to advance freshwater biodiversity research globally as a critical step in improving coordinated actions towards its sustainable management and conservation.Peer reviewe

Giant sporadic fundic gland polyp: Endoscopic and endosonographic features and management

Fundic gland polyps are the most common gastric polyps. They are usually small in size, sporadic and asymptomatic. We present a case of giant fundic gland polyp. Our case is particular because of the clinical presentation, the endoscopic and endosonographic documented findings, and the treatment otpions followed. © 2008 The WJG Press. All rights reserved.Ahmad NA, 2002, GASTROINTEST ENDOSC, V55, P390, DOI 10.1067-mge.2002.121881; Burt RW, 2003, GASTROENTEROLOGY, V125, P1462, DOI 10.1053-S0016-5085(03)01393-3; Declich P, 2004, GUT, V53, P1721; GELLER AJ, 1992, J CLIN GASTROENTEROL, V15, P352; Gencosmanoglu R, 2003, WORLD J GASTROENTERO, V9, P2236; Ginsberg GG, 1996, AM J GASTROENTEROL, V91, P714; KINOSHITA Y, 1993, GASTROINTEST ENDOSC, V39, P161, DOI 10.1016-S0016-5107(93)70057-7; MARCIAL MA, 1993, AM J GASTROENTEROL, V88, P1711; McGarrity TJ, 2000, AM J GASTROENTEROL, V95, P1824; Muehldorfer SM, 2002, GUT, V50, P465, DOI 10.1136-gut.50.4.465; Muller-Hocker J, 2003, VIRCHOWS ARCH, V442, P496, DOI 10.1007-s00428-003-0780-8; Nagata S, 2005, J GASTROEN HEPATOL, V20, P1461, DOI 10.1111-j.1440-1746.2005.03248.x; Oberhuber G, 2000, VIRCHOWS ARCH, V437, P581, DOI 10.1007-s004280000330; Sebastian S, 2004, GASTROINTEST ENDOSC, V59, P398, DOI 10.1016-S0016-5107(03)02595-1; Sekine S, 2004, MODERN PATHOL, V17, P1421, DOI 10.1038-modpathol.3800178; Weston BR, 2003, J CLIN GASTROENTEROL, V36, P399, DOI 10.1097-00004836-200305000-00007; Winkler A, 2007, ENDOSCOPY, V39, pE34, DOI 10.1055-s-2006-945021; Woodfield CA, 2005, EUR J RADIOL, V53, P341, DOI 10.1016-j.ejrad.2004.12.00920

Chironomid (Insecta : Diptera) assemblages from a gradient of lotic and lentic waterbodies in river floodplains of France: A methodological tool for paleoecological applications.

International audienc

Epilithic chironomid larvae and water enrichment: is larval distribution explained by epilithon quantity or quality?

International audienceThe effects of nutrient enrichment of stream water on epilithic chironomid larval assemblages were examined during spring in a Mediterranean catchment. Three reaches that differed in degree of enrichment were selected for comparison. Water chemistry, epilithon biomass (as ash-free dry mass [AFDM]), epilithic algal biomass (as chlorophyll a [chl a]), algal biovolumes, and algal composition were analyzed to determine their association with density and taxonomic composition of epilithic chironomids. Kendall's s coefficient of rank correlations and canonical correlation analysis were used to evaluate correlations between the chironomid and algal assemblages. Significant correlations were found between chironomid larval densities and total algal cell densities and biovolumes. Chironomid larval densities were not significantly correlated with chl a or AFDM. Several contrasting trends were identified in the relationships between chironomid and algal assemblages. Densities of fixed-tube scrapers, such as Eukiefferiella claripennis and Cricotopus bicinctus, were strongly correlated with biovolumes of Rhodophyceae and Diatomophyceae, whereas densities of free-living scrapers, such as Thienemaniella, were slightly correlated with Chlorophyceae biovolume. Therefore, nutrient enrichment strongly influenced epilithic chironomid assemblage structure through its effects on biovolumes and cell densities of the epilithic algal assemblages

Chironomid (Insecta : Diptera) assemblages from a gradient of lotic and lentic waterbodies in river floodplains of France: A methodological tool for paleoecological applications.

International audienc