Arid
DIGESTA PASSAGE AND FUNCTIONAL-ANATOMY OF THE DIGESTIVE-TRACT IN THE DESERT TORTOISE (XEROBATES AGASSIZII)
BARBOZA, PS
来源期刊JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTAL PHYSIOLOGY
ISSN0174-1578
出版年1995
卷号165期号:3页码:193-202
英文摘要

The herbivorous tortoise Xerobates agassizii contends with large fluctuations in the duality and abundance of desert pastures. Responses to grass (Schismus barbatus), herbage (Sphaeralcea ambigua) and pelleted diets were studied in captive animals. Digestive anatomy was investigated in wild tortoises. Cornified esophageal epithelia and numerous mucus glands along the digestive tract indicated a resistance to abrasive diets. Gastric con tents were acidic whereas hindgut digesta were near neutral pH. The colon was the primary site of fermentation with short-chain fatty acids mainly comprised of acetate (69-84%), propionate (10-15%) and n-butyrate (1-12%). Fibre digestion was extensive and equivalent to 23-64% of digestible energy intakes. Large particles of grass (25 mm; Cr-mordants) were excreted as a pulse but retained longer than either fluids (Co-EDTA) or fine particles (2 mm; Yb). Patterns of marker excretion suggested irregular mixing of only the fluid and fine particulate digesta in the stomach and the colon. Mean retention times of Cr-mordants were 14.2-14.8 days on the grass and high-fibre pellets. Intakes of grass were low and accompanied by smaller estimates of digesta fill than for the high-fibre pellets. Digestive capacity was large and estimated at 11-21% of body mass on these diets. The capacious but simple digestive anatomy of the tortoise may provide the greatest flexibility in utilizing a variety of forages in its unreliable habitat.


英文关键词DIGESTION FIBER FERMENTATION PARTICLE-SIZE REPTILE XEROBATES
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:A1995RR50500004
WOS关键词FATTY-ACID PRODUCTION ; FRESH-WATER TURTLE ; IGUANA-IGUANA ; HINDGUT FERMENTATION ; HERBIVOROUS LIZARDS ; AEGYPTIUS AGAMIDAE ; FIBER DIGESTION ; WOMBATS ; MARKERS ; CONSEQUENCES
WOS类目Physiology ; Zoology
WOS研究方向Physiology ; Zoology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/131589
作者单位(1)SMITHSONIAN INST,NATL ZOOL PK,DEPT ZOOL RES,WASHINGTON,DC 20008
推荐引用方式
GB/T 7714
BARBOZA, PS. DIGESTA PASSAGE AND FUNCTIONAL-ANATOMY OF THE DIGESTIVE-TRACT IN THE DESERT TORTOISE (XEROBATES AGASSIZII)[J],1995,165(3):193-202.
APA BARBOZA, PS.(1995).DIGESTA PASSAGE AND FUNCTIONAL-ANATOMY OF THE DIGESTIVE-TRACT IN THE DESERT TORTOISE (XEROBATES AGASSIZII).JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTAL PHYSIOLOGY,165(3),193-202.
MLA BARBOZA, PS."DIGESTA PASSAGE AND FUNCTIONAL-ANATOMY OF THE DIGESTIVE-TRACT IN THE DESERT TORTOISE (XEROBATES AGASSIZII)".JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTAL PHYSIOLOGY 165.3(1995):193-202.
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