尼日利亚热带雨林池塘中茄氏旗鳉的食性

本文逐月研究了尼日利亚Mfangmfangpond中茄氏旗鳉全年的食性。其食谱按优势多寡出现的次序分别是陆生无脊椎动物、大型植物、水生无脊椎动物、小型甲壳动物、沙粒和藻类。我们将膜翅目、鞘翅目和双翅目昆虫作为其食性的次级项,而全年都出现的有机体碎屑作为初级项。雄鱼较雌鱼捕食了更多的陆生无脊椎动物。茄氏旗在雨季有16项食物组成,但旱季只有7项。就相对重要性而言,陆生和水生无脊椎动物在旱季更大,而大型植物碎屑、小型甲壳动物、沙粒和藻类则在雨季更大。成鱼较幼鱼更多地以外源性无脊椎动物为食。雌鱼较雄鱼有更强的觅食能力;同样,成鱼较幼鱼的觅食能力强得多.

Diet of African killifish Aphyosemion gardneri (Aplocheilidae) in a Nigerian rainforest pond

The diet of Aphyosemion gardneri was studied in Mfangmfang pond in Uyo, Nigeria from January to December.The major food components (in decreasing order of dominance) were terrestrial invertebrates, macrophytes, aquatic invertebrates, microcrustaceans, sand grains, and algae.Hymenoptera, Coleoptera, and Diptera were considered secondary items, while fine particulate organic matter(FPOM), which occurred throughout the year, was a primary food item.Males consumed more terrestrial invertebrates than females.The wet-season diet comprised 16 items whereas the dry-season diet comprised only seven items.The relative importance of terrestrial and aquatic invertebrate was higher during the dry season, while that of macrophyte matter microcrustaceans, sand grains and algae was higher in the wet-season.Adults fed on more allochthonous invertebrates than juveniles.Females had higher foraging performance than males.Similarly, the foraging performance of adults was much higher than that of the juveniles.