[MARMAM] New publication on digestion process in the dolphin stomach

[Hiroshi OHIZUMI]

My co-authors and I are pleased to announce the publication of our new paper on 
the digestion process of ingested prey in the dolphin stomach.

Digestion Process of Ingesta in Forestomach of Indo-Pacific Bottlenose Dolphin 
(Tursiops aduncus).
Hiroshi Ohizumi, Makiko Koide, Hiroko Kusakabe, Keiichi Ueda, Makio Yanagisawa 
and Haruka Koga.

Journal of the School of Marine Science and Technology, Tokai University. 17, 
pp 1-9. (2019)

http://sdb01.scc.u-tokai.ac.jp/laec-s/mst/kiyou/bull/index.html
(You can see the English menu on the page top right. Full text PDF in English 
is available.)

Abstract
We investigated the relationship between elapsed time and the process of food 
digestion in the forestomach and the estimated time for stomach evacuation in 
an Indo-Pacific bottlenose dolphin. The digestion process was observed with a 
gastroscope to reveal the characteristic progress of digestion of different 
prey species. Single flying fish (approximately 100 g) and mackerel 
(approximately 200 g) were similarly digested, despite the difference in their 
size. Single squid (approximately 100 g) was digested faster than similar sized 
flying fish. The weight of stomach contents and the digestion time to 
evacuation showed an apparent positive relationship, and a full stomach content 
of flying fish was digested to the point of evacuation within approximately 10 
hours of ingestion. Since it is an experimental result using only one dolphin, 
it cannot be immediately applied to the stomach content analysis of wild 
individuals, but it is considered that the difference in digestion time!
  among prey species can be compared.


Best regards,
Hiroshi Ohizumi
ohiz...@scc.u-tokai.ac.jp
Ph.D. Tokai University, Japan.


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[MARMAM] New article

[Hiroshi OHIZUMI]

Dear MARMAM members,

I would like to inform you a new article about blood gas analysis in Pacific 
white-sided dolphin. Please request pdf copy to ohiz...@scc.u-tokai.ac.jp.

Best wishes,
Hiroshi


Effect of Breath-Hold on Blood Gas Analysis in Captive Pacific White-Sided 
Dolphins (Lagenorhynchus obliquidens).
F. Terasawa, H. Ohizumi and I. Ohshita. 2010. The Journal of Veterinary Medical 
Science, 72(9), 1221-1224.

Abstract
The effect of a breath-hold on blood gas was evaluated in captive Pacific 
white-sided dolphins (Lagenorhynchus obliquidens). Serial blood collections 
were performed from a vessel on the ventral surface of the flukes during 
breath-hold. In total, 178 blood samples were taken from three dolphins for 
five trials in each animal. During a breath-hold, partial pressure of oxygen 
(Po2) decreased from 152.5 to 21.8 mmHg and partial pressure of carbon dioxide 
(Po2) conversely increased from 31.8 to 83.6 mmHg. The range of pH was 7.54 to 
7.25, suggesting drastic change from alkalemia to acidemia. These wide ranges 
of blood gas imply a considerable change of oxygen affinity caused by the Bohr 
effect during breath-hold, which enable effective uptake and distribution of 
oxygen to metabolizing tissues.


++
Hiroshi OHIZUMI Ph. D.
Tokai University
Department of Marine Biology
School of Marine Science and Technology
3-20-1 Orido, Shimizu, Shizuoka
424-8610 Japan
Tel: +81-543-334-0411
Fax: +81-543-337-0239
ohiz...@scc.u-tokai.ac.jp
++
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