Macro- and microstructures of the digestive tract in the Eurasian collared dove, Streptopelia decaocto (Frivaldszky 1838): Adaptive interplay between structure and dietary niche,Microscopy Research and Technique

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Macro- and microstructures of the digestive tract in the Eurasian collared dove, Streptopelia decaocto (Frivaldszky 1838): Adaptive interplay between structure and dietary niche
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2021-05-25 , DOI: 10.1002/jemt.23843
Ahmed A El-Mansi _{1,

2} , Eman A El-Bealy ₁ , Ahmed M Rady ₃ , Mohamed A Abumandour ₄ , Dina A El-Badry ₂

Affiliation

We describe the functional morphology of the digestive tract of the Eurasian collared dove, Streptopelia decaocto using anatomical, morphometric, histological, histochemical, and ultrastructure techniques, and relate our findings to the species' dietary niche. Our results revealed that the esophagus is displaced on both sides of the neck and has highly folded tunica mucosa, which confer greater elasticity for efficient swallowing and passage of food to the crop. The proventriculus is delicate and its mucosal layer contains polymorphic glands with dense profound and superficial secretory units that open to the luminal surface by gastric pores. The ventriculus is biconvex and lined with a keratinized koilin membrane. The tubular glands within the mucosal lining include the isthmus, the neck, and the basal segment that comprise chief and basal cells with prominent nuclei. At the cuticle-mucosal interface, pyramidal vertical rodlets of the cuticle are secreted and superficially covered by a thin film of a horizontal matrix. The mucosa of the ileum form pyramidal villi that are oriented perpendicularly to the central lumen. Enterocytes infiltrated with goblet cells make up the epithelial lining of the villi. There are subtle differences in the thicknesses of corresponding tunics together with histochemical reactions of alcian blue (AB) and Masson–Goldner trichrome (MT) for their microstructures. Overall, our findings reveal remarkable convergence of both macro-and microstructures in S. decaocto to other granivorous species, and offer further evidence of the close association between functional morphology and feeding style relative to food swallowing, digestion, and absorption.

中文翻译：

欧亚项圈斑鸠消化道的宏观和微观结构，德考克托链球菌（Frivaldszky 1838）：结构和饮食生态位之间的适应性相互作用

我们描述了欧亚领斑鸠Streptopelia decaocto消化道的功能形态使用解剖学、形态测量学、组织学、组织化学和超微结构技术，并将我们的发现与该物种的饮食生态位联系起来。我们的研究结果表明，食道在颈部两侧移位，并具有高度折叠的粘膜，这为有效吞咽和食物通过作物提供了更大的弹性。腺胃是脆弱的，其粘膜层含有多形性腺体，具有致密的深而浅的分泌单位，通过胃孔通向管腔表面。脑室是双凸面的，内衬有角化的 koilin 膜。粘膜衬里内的管状腺体包括峡部、颈部和基底节，由具有突出细胞核的主细胞和基底细胞组成。在角质层-粘膜界面，角质层的锥形垂直小棒被分泌出来，表面被水平矩阵的薄膜覆盖。回肠粘膜形成垂直于中央管腔的锥体绒毛。被杯状细胞浸润的肠上皮细胞构成了绒毛的上皮衬里。相应的外衣的厚度以及阿尔新蓝 (AB) 和马森-戈德纳三色 (MT) 的组织化学反应在其微观结构上存在细微差异。总的来说，我们的研究结果揭示了宏观和微观结构在相应的束腰外衣的厚度以及阿尔新蓝 (AB) 和马森-戈德纳三色 (MT) 的微观结构的组织化学反应存在细微差异。总的来说，我们的研究结果揭示了宏观和微观结构在相应的束腰外衣的厚度以及阿尔新蓝 (AB) 和马森-戈德纳三色 (MT) 的微观结构的组织化学反应存在细微差异。总的来说，我们的研究结果揭示了宏观和微观结构在S. decaocto与其他食谷物种，并进一步证明功能形态与进食方式之间与食物吞咽、消化和吸收相关的密切关联。

更新日期：2021-05-25

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