Modulation of gill surface area does not correlate with oxygen loss in Chitala ornata.

IF 3.8 1区 生物学 Q1 BIOLOGY
Magnus L Aaskov, Atsushi Ishimatsu, Jens R Nyengaard, Hans Malte, Henrik Lauridsen, Nguyen Thi Kim Ha, Do Thi Thanh Huong, Mark Bayley
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引用次数: 0

Abstract

Air-breathing fish risk losing aerially sourced oxygen to ambient hypoxic water since oxygenated blood from the air-breathing organ returns through the heart to the branchial basket before distribution. This loss is thought to help drive the evolutionary reduction in gill size with the advent of air-breathing. In many teleost fish, gill size is known to be highly plastic by modulation of their anatomic diffusion factor (ADF) with inter-lamellar cell mass (ILCM). In the anoxia-tolerant crucian carp, ILCM recedes with hypoxia but regrows in anoxia. The air-breathing teleost Chitala ornata has been shown to increase gill ADF from normoxic to mildly hypoxic water by reducing ILCM. Here, we test the hypothesis that ADF is modulated to minimize oxygen loss in severe aquatic hypoxia by measuring ADF, gas-exchange, and by using computed tomography scans to reveal possible trans-branchial shunt vessels. Contrary to our hypothesis, ADF does not modulate to prevent oxygen loss and despite no evident trans-branchial shunting, C. ornata loses only 3% of its aerially sourced O2 while still excreting 79% of its CO2 production to the severely hypoxic water. We propose this is achieved by ventilatory control and by compensating the minor oxygen loss by extra aerial O2 uptake.

鳃表面积的变化与虎斑鱼的氧气损失无关。
呼吸空气的鱼类有可能将空气中的氧气流失到周围缺氧的水中,因为从呼吸空气器官流出的含氧血液会通过心脏返回支气管篮,然后再进行分配。这种损失被认为有助于推动鳃的尺寸随着呼吸空气的出现而逐渐缩小。众所周知,在许多远摄性鱼类中,鳃的大小具有很强的可塑性,其解剖扩散因子(ADF)与瓣间细胞质量(ILCM)可相互调节。在耐缺氧的鲫鱼中,ILCM 随缺氧而衰退,但在缺氧时会重新增长。有研究表明,呼吸空气的长脚鱼 Chitala ornata 可通过减少 ILCM 来增加从正常缺氧水到轻度缺氧水的鳃 ADF。在这里,我们通过测量 ADF 和气体交换,并使用计算机断层扫描来揭示可能的跨支分流血管,从而验证了 ADF 在严重水生缺氧情况下被调节以尽量减少氧气损失的假设。与我们的假设相反,ADF 并不通过调节来防止氧气损失,尽管没有明显的跨支分流,但鸟鳞鱼只损失了 3% 的氧气,同时仍将其产生的 79% 的二氧化碳排泄到严重缺氧的水中。我们认为这是通过呼吸控制和额外的氧气吸收来补偿少量的氧气损失而实现的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.90
自引率
4.30%
发文量
502
审稿时长
1 months
期刊介绍: Proceedings B is the Royal Society’s flagship biological research journal, accepting original articles and reviews of outstanding scientific importance and broad general interest. The main criteria for acceptance are that a study is novel, and has general significance to biologists. Articles published cover a wide range of areas within the biological sciences, many have relevance to organisms and the environments in which they live. The scope includes, but is not limited to, ecology, evolution, behavior, health and disease epidemiology, neuroscience and cognition, behavioral genetics, development, biomechanics, paleontology, comparative biology, molecular ecology and evolution, and global change biology.
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