کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5510242 | 1538974 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins
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کلمات کلیدی
kPaPO2Q10Adenosine Triphosphate - آدنوزین تری فسفاتATP - آدنوزین تری فسفات یا ATPbpm - بوقلمونMetabolic compensation - جبران متابولیکTemperature - دماAmbient temperature - دمای محیطAcclimation - سازگاریVentilation rate - سرعت تهویهMetabolic rate - سرعت متابولیسمbeats per minute - ضربان در دقیقهHeart rate - ضربان قلبPartial pressure of oxygen - فشار جزئی اکسیژنAtlantic salmon - ماهی سالمون آتلانتیکHemoglobin - هموگلوبینHypoxia - هیپوکسیkilopascal - کیلو پاسکال
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Hypoxia is common in aquatic environments and has substantial effects on development, metabolism and survival of aquatic organisms. To understand the physiological effects of hypoxia and its dependence on temperature, metabolic rate (MÌO2) and cardiorespiratory function were studied in response to acute hypoxia (21 â 5 kPa) at different measurement temperatures (Ta; 4, 8 and 12 °C) in Salmo salar alevins that were incubated under normoxic conditions (PO2 = 21 kPa) or following hypoxic acclimation (PO2 = 10 kPa) as well as two different temperatures (4 °C or 8 °C). Hypoxic acclimation lead to a developmental delay manifested through slower yolk absorption. The general response to acute hypoxia was metabolic depression (~ 60%). Hypoxia acclimated alevins had higher MÌO2s when measured in normoxia than alevins acclimated to normoxia. MÌO2s were elevated to the same degree (~ 30% per 4 °C change) irrespective of Ta. Under severe, acute hypoxia (~ 5 kPa) and irrespective of Ta or acclimation, MÌO2s were similar between most groups. This suggests that despite different acclimation regimes, O2 transport was limited to the same degree. While cardiorespiratory function (heart-, ventilation rate) was unchanged in response to acute hypoxia after normoxic acclimation, hypoxic acclimation led to cardiorespiratory changes predominantly in severe hypoxia, indicating earlier onset and plasticity of cardiorespiratory control mechanisms. Although MÌO2 in normoxia was higher after hypoxic acclimation, at the respective acclimation PO2, MÌO2 was similar in normoxia and hypoxia acclimated alevins. This is indicative of metabolic compensation to an intrinsic MÌO2 at the acclimation condition in hypoxia-acclimated alevins after re-exposure to normoxia.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 213, November 2017, Pages 28-35
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 213, November 2017, Pages 28-35
نویسندگان
Elias T. Polymeropoulos, Nicholas G. Elliott, Peter B. Frappell,