蓝翅希鹛消化系统的初步研究

对6只(3♀,3♂)蓝翅希鹛的消化系统进行了解剖观察,结果表明:蓝翅希鹛的舌成细长三角形,雌、雄舌尖端差异显著:雌鸟舌尖端各有一根长刺毛,而雄鸟无此长刺毛;在舌前端正中央还有一"v"形的凹缺,使舌成二分叉,雌鸟分叉深约2.77 mm,雄鸟为1.63 mm。食道颈胸部分段不明显,食管长18.64~23.55 mm,嗉囊外观不明显。腺胃乳突短而小,分布均匀;肌胃发达,具角质膜。肠道长与体长基本相等,小肠较发达,雌鸟长100.90 mm,占肠道总长90.08%,雄鸟分别为102.52 mm和89.60%;具有双侧盲肠,但不发达,占肠道总长的2.3%~2.8%,右侧盲肠略大于左侧;直肠短,雌鸟仅占肠道8.55%,雄鸟占8.72%。肝为体内最大的消化腺,分左右两叶。胰位于十二指肠袢内,细长形,分二小叶。由消化道特征说明其食性是以食虫为主的杂食性鸟类。

Preliminary Study on Digestive System of Minla cyanouroptera in Morphology

Morphology of the digestive system of Minla cyanouroptera has been observed preliminarily by naked eyes and dissecting microscope.The results indicate that the tongue is thin triangle,and the different apex of tongue with famle and male are obvious.Apex of tongue of famle has a long seta in each part but the male has not.The apex of tongue is furcate,and the furcate depth of the famle is 2.77mm and the male is 1.63mm.The length of the esophagus is 18.64 ~ 23.55mm,and the crop is not different from aspect.On the surface of glandular stomach there are short and small papilla,and the muscular stomach is upgrowth with a flat of developed horniness on the inside.The length of intestine is almost as long as that of the whole body.The small intestine is relatively developed,with a length of 100.90 mm in female accounting for 89.60%of total length of intestinal tract,while the male is 102.52mm and 90.08%.The caecum occupys 2.3% ~ 2.8% of the whole length of the intestine and the right is bigger than the left.The large intestine of female is short,only occupying 8.55% of the whole length of the intestine,while the male is 8.72%.Liver is the biggest digestive glands in the coelom and separates into two parts.The pancreas locating in the flection of the duodenum is thin and long,which all divides into two parts.According to the character of the digestive system,we can conclude that the food habit of the Minla cyanouroptera is entomophagous.