It has long been known what a magical effect water has on humans. And what a richest world is hidden under the mysterious mirror surface!
To prevent clogging of the pond with decay products, it is useful to settle water snails in it, eating the remains of food and lower algae. Horn-shaped coils (Planorbis vortex and Coretus corneus) are most beneficial. The common pond snail (Limnaea stagnalis) is also interesting. But it grows quickly, is very voracious and, unlike the coil, does not disdain fish caviar and fish fry. In addition, the pond snail can damage the leaves of the water lilies.
"Dancing" on the water for a home lake
Black shiny beetles (family Gyrinidae) rush along the surface of the water, winding swift bends. At the first sign of danger, they scatter and dive under the water, but soon gather again to continue their "dance". The twirls have an interesting feature - their eyes are divided by a transverse gap into two parts, so they can simultaneously see both what is under water and what is in the air. Water striders (family Gerridae) glide easily on the mirror surface, barely touching the water surface with their feet.
Sand house builder
In shallow water, every grain of sand, every pebble is visible! Here is a creature moving awkwardly along the bottom. It's a caddis flies (Stenophylax stellatus)! He built his house from grains of sand, twigs, grass - everything went into action. He fastened everything with the secret of the salivary gland, weighed it down with pebbles so that the house would not float up - and now the "housing" is ready!
Long-legged handsome men
There are also water bugs (family Notonectidae) and rowers (family Corixidae). They have long legs, like oars, with a fringed blade at the end. Under the pressure of water, the blades open like a fan, providing a powerful stroke, and in the opposite motion, they fold neatly. At night, smoothies fly, mastering new reservoirs.
Here is an underwater predator, the larva of the bordered swimming beetle (Dytiscus marginalis), sneaking around looking for prey. This is one of the most terrible predators in the waters near Moscow. Having watched the prey, usually a tadpole or a small fish, the larva pounces on it and bites with its terrible jaws, and then drags it along everywhere, slowly digesting it. The swimmer is a large beetle (25–35 mm long); the back is black with a greenish tint, bright yellow stripes border the elytra, powerful hind legs serve it for rowing, with the front legs it holds prey.
Predators in "masks"
Larvae of large dragonflies are also serious predators. They are very distinctive. First, attention is drawn to the structure of the lower lip of the larva, which is a kind of "mask". While hunting, the larva, as it were, “throws” this “mask” forward in order to capture its prey.
Another feature is the way of transportation. Larvae of large dragonflies breathe by “inhaling” and “exhaling” water through the anus. Sharply pushing out water, the larva moves according to the principle of a jet engine.
Having reached a certain age, the larva climbs up the stem of the aquatic plant and rises out of the water. Having dried out, its outer shell cracks along the back, and an adult dragonfly gets out of it.
Frog frogs night songbirds for the lake
Of course, what a pond would do without frogs! In our strip, grass frogs (Rana temporaria) and lake frogs (Rana ridibunda) are found. Both are predominantly brown. Grass frogs live near the reservoir. They are in the water in the spring, during the breeding season, and with the onset of cold weather they sink to the bottom of the pond and winter like that. Unlike other species of frogs, they are less "vociferous", do not croak during breeding, but emit a quiet "grunt". In addition, sharp-faced frogs (Rana terrestris) can be “populated” into the pond, the males of which acquire a rich silvery-blue color during the mating season.
The gray toad is an unusual inhabitant of the home lake
Gray toad (