Trophic Ecology Study Contribution Anas Platyrhynchos (Linné, 1758) in the Réghaia’s Lake National Reserve, Algéria

摘要

Studies on the diet of Mallard DuckAnas platyrhynchos(Linné, 1758) was carried out from February 2011 until January 2012 in the fen of Reghaia’s lake, sub-humid area located in the North of Algeria. The diet study of the Mallard duck requires prior inventory of trophic environment availabilities. This inventory allowed recording considerable diversity in plant species, Paspalum distichum is the most abundant species. It is followed by Typha angustifolia. The faunistic biodiversity study by Barber’s pots in Reghaia’s humid area, allowed discerning 975 invertebrates. They spread into 7 classes(Gastropoda,Arachnida, Crustacea,Myriapoda, PodurataandInsecta),21ordersand115species. In terms of richness, insecta are noted with 93 species (83,9%). Catch of species by kick net allowed capture of 1457 individuals. They belong to 8 classes, 14 orders, 23 families, and 23 species. The most represented order is that one of Diptera with 6 species followed by the one of Coleoptera with 5 plant species.The dietary regime study of the Mallard duck at level of Reghaia’s lake through their droppings’ analysis allowed us inventorying 24 plant species consumed. It is about 8 Poaceae which are quoted certain species frequently ingested: Hordeum murinum and Poa annua, 1 Typhacée Typha latifolia and 1 Cypéracées Scirpus sp, followed by family of Iridaceae represented by Iris pseudacurus, and family of Plantaginaceae by Plantago crasiifolia. Animal preys are essentially composed of 40% of Tabanidaesp.ind(Diptera),20,0%of Chironomidés(Diptera),and Monomoriumsp.ind(Hymenoptera). The diet study of the Mallard Duck confirmed the herbivorous character of this species. It possesses an omnivorous dietary regime where plants are generally predominant.