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Hypoxia

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...

Acute Respiratory Failure-II

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:

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Updated: Nov 18, 2025

A Simple Approach to Manipulate Dissolved Oxygen for Animal Behavior Observations

A Simple Approach to Manipulate Dissolved Oxygen for Animal Behavior Observations

Published on: June 28, 2016

Do aquatic ectotherms perform better under hypoxia after warm acclimation?

Michael Collins¹, Manuela Truebano², Wilco C E P Verberk³

¹Marine Biology and Ecology Research Centre, Plymouth University, Drake Circus, PL4 8AA, UK michael.collins@plymouth.ac.uk.

The Journal of Experimental Biology

|February 5, 2021

Summary

Aquatic animals face worsening hypoxia from warming. While acute heat harms performance, warm acclimation may help, but long-term impacts on hypoxic performance remain a concern for species survival.

Keywords:

Climate change Critical oxygen tension Dissolved oxygen Metabolic rate OCLTT Thermal acclimation

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Induction of Hypoxia in Living Frog and Zebrafish Embryos

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Published on: June 26, 2017

Area of Science:

Environmental Science
Aquatic Ecology
Climate Change Biology

Background:

Aquatic animals increasingly face environmental hypoxia due to climate warming and eutrophication.
Acute warming generally impairs performance under hypoxia, but the role of thermal acclimation is less understood.

Purpose of the Study:

To review literature on whether hypoxic performance of aquatic ectotherms improves after warm acclimation.
To identify methodological limitations in current research and suggest appropriate approaches for future studies.

Main Methods:

Literature review focusing on studies that differentiate between acute thermal effects and thermal acclimation effects on hypoxic performance.
Analysis of studies employing standardized test temperatures after acclimation to different temperatures.

Main Results:

Acute warming predominantly impairs hypoxic performance.
Warm acclimation tends to be beneficial or neutral for hypoxic performance, partially offsetting acute warming effects.
Few studies use appropriate methodology to isolate acclimation effects.

Conclusions:

Warm acclimation may offer some resilience to hypoxia in aquatic ectotherms, but overall performance is likely to decline in warmer, hypoxic environments.
Future research should use appropriate methodologies to quantify acclimation effects and investigate developmental or multigenerational compensation mechanisms.