Autohaemorrhaging

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Horned lizard showing evidence of autohaemorrhaging Phrynosoma orbiculare.JPG
Horned lizard showing evidence of autohaemorrhaging

Autohaemorrhaging, or reflex bleeding, is the action of animals deliberately ejecting blood from their bodies. Autohaemorrhaging has been observed as occurring in two variations. [1] In the first form, blood is squirted toward a predator. The blood of these animals usually contains toxic compounds, making the behaviour an effective chemical defence mechanism. In the second form, blood is not squirted, but is slowly emitted from the animal's body. This form appears to serve a deterrent effect, and is used by animals whose blood does not seem to be toxic. [1] Most animals that autohaemorrhage are insects, but some reptiles also display this behaviour. [2]

Contents

Some organisms have shown an ability to tailor their autohaemorrhaging response. Armoured crickets will projectile autohaemorrhage over longer distances when attacked from the side, compared to being attacked from an overhead predator. [3]

Insects

Several orders of insects have been observed to utilize this defence mechanism.

Reptiles

A West Indian wood snake displaying autohaemorrhaging. The eyes are fully flooded with blood and some is emerging from the mouth. Tropidophis curtus barbouri autohaemorrhaging.jpg
A West Indian wood snake displaying autohaemorrhaging. The eyes are fully flooded with blood and some is emerging from the mouth.

Lizards

Snakes

Consequences of reflexive bleeding

In some cases, the loss of blood can be substantial. Beetles may lose up to 13% of their net body weight as a consequence of expelling haemolymph. [13] Autohaemorrhaging may result in dehydration. The ejection of blood puts organisms at risk of cannibalism from conspecifics. [14]

An inactive prepupa Asian ladybeetle autohaemorrhaging, resulting from cannibalism by an adult of the same species. Canibalism - Reflex bleeding (2106637702).jpg
An inactive prepupa Asian ladybeetle autohaemorrhaging, resulting from cannibalism by an adult of the same species.

See also

Related Research Articles

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References

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