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Hypoxia01:23

Hypoxia

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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...
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Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

1
Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
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Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is...
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Osmoregulation in Fishes02:32

Osmoregulation in Fishes

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When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
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Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated....
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Related Experiment Video

Updated: Jun 9, 2025

Author Spotlight: Advancing Coral Culture - Creating a Semi-Quantitatively Controlled Microenvironment System to Counter Current Limitations
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Coral Community Composition Linked to Hypoxia Exposure.

Noelle M Lucey1,2, Carolina César-Ávila2, Alaina Eckert2

  • 1Department of Geosciences and High Meadows Environmental Institute, Princeton University, Princeton, New Jersey, USA.

Global Change Biology
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

Low oxygen levels significantly impact coral reef health. Different coral species show varying tolerance to hypoxia, influencing their distribution and survival on Caribbean reefs.

Keywords:
biodiversitycoral competitionecosystem structurefoundation specieshypoxia tolerancemultiple stressorsocean deoxygenation

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Area of Science:

  • Marine biology
  • Coral reef ecology
  • Environmental science

Background:

  • Coral species composition is key to tropical reef ecosystems.
  • Factors driving coral diversity and distribution remain incompletely understood.
  • Understanding coral responses to environmental stressors is crucial for conservation.

Purpose of the Study:

  • To investigate the relationship between low oxygen tolerance and coral species abundance on Caribbean reefs.
  • To determine the impact of repeated nocturnal hypoxia on different coral species.
  • To develop a predictive model for coral species distribution based on hypoxic pressure.

Main Methods:

  • Laboratory experiments simulating reef conditions with controlled low oxygen (hypoxia) and temperature.
  • Assessing coral bleaching and mortality in response to repeated hypoxic events.
  • Measuring species-specific sensitivities to hypoxia for key coral species like Acropora cervicornis and Porites furcata.
  • Developing a hypoxic pressure metric integrating experimental data with field data.

Main Results:

  • Repeated nightly low oxygen events caused significant coral bleaching and mortality, with temperature having minimal effect.
  • Coral species exhibited varied responses to hypoxia; Acropora cervicornis showed >50% bleaching, while Porites furcata was unaffected.
  • A predictive metric accurately forecasted species abundance across three reefs based on hypoxic pressure.
  • Hypoxia-sensitive Acropora cervicornis dominated well-oxygenated reefs, whereas hypoxia-tolerant Porites furcata thrived on oxygen-depleted reefs.

Conclusions:

  • Differential tolerance to low oxygen physiologically excludes sensitive coral species from hypoxic reef environments.
  • Management strategies addressing hypoxia are essential to mitigate the risk of coral species extirpation.
  • Coral distribution patterns are strongly linked to their varying abilities to cope with fluctuating oxygen levels.