CATDOLL : CATDOLL: Why do earthworms crawl out of the soil on rainy days?

Why do earthworms crawl out of the soil when it rains?

Earthworms crawl out of the soil on rainy days, on the one hand because they cannot breathe in the soil, and on the other hand because the rain dissolves the carbon dioxide in the soil pores into carbonates, which stimulates the earthworms to crawl out of the soil.

Earthworms breathe by gas diffusion on their body surface. Earthworms do not have respiratory organs, but because of the large number of microvascular networks distributed on their body surface, the plasma of earthworms contains abundant hemoglobin, which can easily bind to oxygen and release oxygen. When the skin is moist, gas exchange can be easily carried out.

The better the soil is ventilated, the better the earthworms can metabolize. On rainy days, the rain will fill and seal the pores of the soil, making it difficult for earthworms to breathe, which causes a large number of earthworms to crawl out of the ground to breathe air. At the same time, earthworms like moisture, are afraid of light, and are very sensitive to soil pH.

Additional information

The regenerative capacity of earthworms

The reason why earthworms can grow again after being broken is because they have the ability to regenerate. It does not turn into two earthworms, but only the part containing the "reproductive ring" will regenerate into a complete individual.

To be precise, it is not necessarily the tail that the earthworm regenerates. It does not matter whether the segment containing the "reproductive ring" is the head or the tail. Generally, the body segments of earthworms begin to regenerate in about 10 days, and they have the ability to regenerate from head to tail. However, the regeneration ability of different body segments of earthworms is different. The regeneration speed of body segments with head but no tail or without head and tail is faster than that of body segments with head but tail.

Reference source: Baidu Encyclopedia - Earthworm (invertebrate)

Reference source: China.com - The mass exodus of earthworms has caused panic and scientists cannot explain it

Reference source: Baidu Encyclopedia - Regeneration ability

I just got home and saw the news that tens of thousands of earthworms crawled out of the ground in Guangzhou. I wonder what’s going on?

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