Ecology and diversity of freshwater shrimps in Banco National Park, Côte d’Ivoire (Banco River Basin)

Abstract

Shrimps are an important component of river invertebrate assemblages in tropical freshwater where they are a controlling group in food webs. In order to determine shrimp diversity in the Banco Basin (Côte d'Ivoire, West Africa) and examine whether the patterns of species distribution were related to environmental conditions, six sites were monitored. Sampling was conducted in 2008 during February, May, September and November using a long-handled net (25-cm diameter, 2-mm mesh). For each site, we measured environmental variables (conductivity, pH, water temperature, dissolved oxygen, turbidity, current speed, and water depth and width). Three shrimp species, Macrobrachium thysi (Powell 1980), Macrobrachium dux (Lenz 1910) and Desmocaris trispinosa (Aurivillius 1898) were identified. D. trispinosa was the largest distributed (more than 50% of occurrence) and the most abundant (67% of total number of specimens caught). It was followed by M. thysi with 47% and 32% of occurrence and abundance, respectively. Canonical correspondence analysis (CCA) showed a spatial distribution of the shrimp community, significantly influenced by width, depth, conductivity, type of substrate, turbidity and dissolved oxygen. Due to the fact that the Banco River hosts an endemic species in Côte d'Ivoire (Macrobrachium thysi), the conservation of integrity of this basin was recommended. canonique des correspondances montre que la distribution spatiale des crevettes dans le bassin du Banco est fortement influencée par la largeur, la profondeur, la conductivité, le type de substrat, la turbidité et l'oxygène dissous. Compte tenu du fait que la rivière Banco héberge une espèce endémique à la Côte d'Ivoire (Macrobrachium thysi), la conservation de l'intégrité de ce bassin est fortement recommandée. RÉSUMÉ

Diversity assessment of benthic macroinvertebrate communities in Banco National Park (Banco Stream, Côte d'Ivoire)

“…The benthic macroinvertebrate communities in the Banco stream basin in the Banco National Park (BNP) are not well known. The only studies available are the description of the freshwater shrimp Macrobrachium thysi , which is endemic to Côte d'Ivoire (Powell, ), and the ecology of shrimps (Camara et al ., ). Of concern is the fact that Banco Stream is subjected to anthropogenic disturbance (municipal waste waters), and surface run‐off potentially leading to its deterioration (Camara et al ., ).…”

Peuplement de la faune de crevettes de la Forêt des Marais Tanoé-Ehy (Sud-Est de la Côte d’Ivoire)

“…Peut-on ajouter le matériel utilisé pour l'échantillonnage et l'effort de pêche qui sont déterminants dans la récolte. La présence de l'espèce Macrobrachium thysi dans la présente étude nuance la conclusion de Powel (1980) et Camara et al (2009) (Djiriéoulou et al, 2014). La positive corrélation entre M. thysi et le taux d'oxygène rend cette espèce plus sensible aux troubles de l'environnement confirmant ainsi la sensibilité de cette espèce à la dégradation de l'environnement.…”

Association of riverine prawns and intermediate host snails and correlation with human schistosomiasis in two river systems in south-eastern Côte d'Ivoire

“…Similar conclusions were drawn by Camara et al . (2009), studying the ecology of prawns in the Banco national park in Abidjan. Although ecological preference seems the main reason identified for the minimal overlap of prawn and intermediate host snail populations in this study, we cannot entirely exclude predation by the prawns as an explanatory factor for the negative correlation found.…”