کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2848229 | 1167413 | 2008 | 10 صفحه PDF | دانلود رایگان |
African lungfish, Protopterus dolloi exhibited constant rates of O2 consumption before (0.95 ± 0.07 mmol kg−1 h−1), during (1.21 ± 0.32 mmol kg−1 h−1) and after (1.14 ± 0.14 mmol kg−1 h−1) extended periods (1–2 months) of terrestrialization while cocooned. Although a breathing event in terrestrialized fish consisted of multiple bouts of inspiration and expiration in rapid succession, the mean frequency of pulmonary breathing events was unaltered in the terrestrialized fish (16.7 ± 1.4 h−1versus 20.1 ± 4.9 h−1 in the aquatic and terrestrialized fish, respectively). Hypoxia (∼20 mmHg) increased the frequency of breathing events by 16 and 23 h−1 in the aquatic and terrestrialized fish, respectively. Hyperoxia (∼550 mmHg) decreased breathing event frequency by 10 and 15 h−1 in the aquatic and terrestrialized animals. Aquatic hypercapnia (∼37.5 mmHg) increased pulmonary breathing frequency (from 15.3 ± 2.3 to 28.7 ± 5.4 h−1) in free swimming lungfish, whereas aerial hypercapnia was without effect in aquatic or terrestrialized fish.
Journal: Respiratory Physiology & Neurobiology - Volume 160, Issue 1, 1 January 2008, Pages 8–17