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Black storks suffer from the weather: fewer babies, many unsuccessful nesting

This year's nesting course differs significantly from previous years. Black storks started due to cold weather in March and April, nest about 2-3 weeks later. little or líhnoucí the chicks in the nest was in a period of heavy rains in early June. Long-term average vyvedených chicks in one nest in CR 3.3, this year is barely two young in the nest.

"Big losses caused by a combination of bad weather and difficult access to food and opacification of the swollen creeks and rivers. many nests, where it has been hatched chicks are now empty and where the cubs survived their number is much lower than in normal years, "explains Francis Pojer of the Agency for Nature Conservation and Landscape, which is monitoring the black stork long-term deals.

Currently, our estimated abundance of black storks at approximately 300-400 breeding pairs. Every year, ornithologists monitor nesting on approximately two hundred known nests, check their availability and ringed chicks.

Black Stork inhabits a large forest, where it builds nests high in the trees. From that strays food for chicks into streams, rivers and ponds in open country, often several miles away. Diet is mainly fish and other aquatic animals live very secretly and in the years just for food is frequently observed and recorded.

The African wintering with black stork returns from mid-March to mid-April, and after returning to renew last year's nesting pairs, or form nové.Vzápětí begin the construction or repair of nests in April appear in a nest egg in May after about a month session lasting hatch chicks.

When checking the nests of black storks are also dedicated ornithologists registration adult birds with rings. They appear as yet unknown fact of life these rare birds *.

"The oldest among us found the black stork comes from the foothills to Strakonicku. He is 19 years old this year, was designated ring as a cub in 1994. Nests less than ten kilometers from the place of birth. In the last two years are nesting pair with a female that comes from Třemšínských Brd, but has a long pedigree - her grandparent / grandfather hatched in the primeval forest reserve Kohoutov to Krivoklatsko, nesting in Volhynia in South Bohemia and one of his descendants (the father of our females mentioned ) settled in southern Brda in Pribram, which is observed for almost ten years and returned this year, "says Francis Pojer.

* Use plastic rings with a unique code that is readable by a powerful telescope at a great distance without disturbing the stork brings very interesting results. It turned out that the stork in adulthood may settle in the nest in which they came into the world, but also to be 400 km away in Germany. It seems that in the world issued more females, while males are deposited close to native nest, usually a few tens of kilometers away.

Source: - tz

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