Dictionary > Diurnal rhythm

Diurnal rhythm

Definition
noun, plural: diurnal rhythms
A biological rhythm that primarily express a periodicity during daylight hours
Supplement
Biological rhythms pertain to the synchronized cyclic pattern demonstrated by an organism as its response to a particular stimulus. Biological clock that synchronizes with biological rhythm may be endogenous or exogenous. An endogenous type is one in which the internal biological clock is the one that controls it. An exogenous type is one that which involves an external cue (i.e. zeitgeber). There are the different types of biological rhythms: circadian rhythms, diurnal rhythm, ultradian rhythms, and infradian rhythms.1
A diurnal rhythm is a biological rhythm that is synchronized with the day/night cycle. It may or may not be a circadian rhythm. A biological rhythm is considered a circadian if these three criteria are met: (1) an endogenous free-running (approximately) 24-hour period, (2) a rhythm that is entrainable, i.e. capable of phase reset by environmental cues and synchronization to the 24-h day, and (3) exhibiting temperature compensation.2
An example of a diurnal rhythm is the release of microfilariae of loa loa into the peripheral blood predominantly at daytime.
See also:

Reference(s):

1 Hedge, A. (2013). Biological Rhythms. Retrieved from ://ergo.human.cornell.edu/studentdownloads/dea3250pdfs/biorhythms.pdf

2 Johnson, C. (2004). Chronobiology: Biological Timekeeping. Sunderland, Massachusetts, USA: Sinauer Associates, Inc. pp. 67–105.


You will also like...

Carbohydrates, fats and proteins - dietary sources
A Balanced Diet – Carbohydrates and Fat

Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..

Wart-like leaf galls on grape leaves
Plant Cell Defense

Plants protect themselves by releasing hydrogen peroxide to fight against fungal invasion. Another way is by secreting c..

Biological Cell Defense
Biological Cell Defense

Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

Pink Lotus plant on a pond
Freshwater Lentic Communities & Animals

This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

New Zealand Flora & Fauna
Ecology & Biodiversity: New Zealand Flora & Fauna

New Zealand is known for its unique biodiversity, caused by its remarkable geography and geologic history. Breaking away..

Origins of Life on Earth
Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..