In nature, when it comes to national protected organisms, many people may not be familiar with it, but the national second-level protected organisms are familiar to everyone, one of the most important reasons is that the national protected organisms are often endangered species or species that have disappeared.
In August, teachers and students of the School of Science of Northeast Forestry University accidentally found the national Grade I key protected plant Raccoon that had "disappeared" for many years in a wetland reserve in the Songnen Plain during outdoor investigation and practice activities.
According to teachers and students at agricultural university, why is the discovery of raccoon an accident? The raccoon found at the scene is very hidden, and the raccoon "disguises" itself with the help of the common locust leaf apple, which is usually invisible. In such a hidden environment, there was a phenomenon of piling up, and it was initially estimated that there were more than 500 plants.
<h1 class= "pgc-h-arrow-right" > how did the late Cretaceous raccoons live to the present? </h1>
Raccopodium, also known as vesicular raccopodium, is a floating herb of the genus Caryophyllaceae, Family Lycaenidae, and Raccopodium. As early as the Late Cretaceous, 85 million to 75 million years ago, it was accompanied by dinosaurs on tropical islands, and after tens of millions of years of geological age, it survived and is one of the ancient relict plants.
Raccoon is a very rare aquatic plant, the main reason is rare, the reason why it is rare or has a great impact on the environment with humans, raccoon on the water quality requirements are very high, suitable for survival of the water PH value of 6, belongs to the acidic water plants.
Once the water quality changes, raccoon will disappear in a large area, raccoon is like a water quality testing indicator, the most direct manifestation of the good or bad water quality is whether it exists.
As a rare and endangered species, its discovery is very rare, according to experts, only 9 plants were found in the nature reserve in 5 years, and the 500 plants found this time have obviously made a very large number of breakthroughs, which also marks the improvement of the ecological environment of Heilongjiang in China.
Why did the 500 raccoons found in Heilongjiang "disguise" themselves? According to the biological evolution of nature, there are usually three situations:
The first case is the natural advantage of the common locust leaf apple, which has a large population and completely wraps the algae around its own body.
In the second case, raccoons are close to the water body suitable for their own survival according to the needs of their own living environment. Locust leaf ping has the function of purifying water quality, and can remove nutrients such as nitrogen and phosphorus in the water.
In the third case, the main reason why the raccoon is close to the locust leaf is that there is food, the locust leaf can attract some insects to get closer, and the raccoon is hidden in it, and can catch a large amount of food.
<h1 class="pgc-h-arrow-right" > what does Raccoon look like? How to prey? </h1>
Raccoons, also known as water flytraps, belong to the insectivorous plants, similar to this plant in the natural world a total of more than 300 genera have insect catching function, is identified as the national rare and endangered protection of only raccoons.
The length of the raccoon is 6-10 cm. The petiole is 3–4 mm long, with 4–6 drill-shaped lobes at the top, 5–7 mm long, the lobes are kidney-shaped and round when flattened, 4–6 mm long and 6–10 mm wide, with glandular and induction hairs, and when stimulated, the two halves are pressed against each other on the middle rib axis, the outer ring is pressed close together, and a capsule is formed in the center to catch insects.
Raccoons are widely distributed, mainly in central, southern, northern and southeastern Asia, and in northern Oceania, while only Heilongjiang has raccoons in China.
Raccoons live mainly in water, and most of the catching plants live on land, so how do raccoons do their predation?
According to the introduction of experts, the predation of raccoon is very rapid, it takes only about 10 milliseconds to complete a hunt, and its hunting ability is more powerful than that of flytraps, which is one of the fastest reaction plants in nature.
Raccoidal hunting is carried out by trapping, and the unfolded leaves of raccoon are usually translucent green, with glandular and induction hairs near the petals, and once the aquatic organisms are close to the leaves, they quickly merge, and the fine hairs prevent the prey from escaping. The leaf sac secretes digestive enzymes that directly digest and absorb the insects.
Raccoidal algae usually behave as a bug that can be absorbed for about 1 week, and after completing the absorption, the petals reopen to welcome the next prey.
In short, the discovery of raccoons in Heilongjiang this time shows that the water quality of Heilongjiang has been restored to a state suitable for the survival of raccoons. The ecological environment is getting better and better, and there will be more species that have disappeared in the future, which may appear again, let's wait and see.