BIRDS SOUND, PHOTO- RIVER AND FISH PHOTO - FLOWERS PHOTO MANY MORE USEFULL DATA
બાળકો, શિક્ષકો અને વાલી માટે ઉપયોગી
વિવિધ પક્ષીઓના અવાજ, ફોટા
વિવિધ પ્રાણીઓ વિશે અને ફોટા
માછલી અને નદી વિશે
વિવિધ વનસ્પતિ અને ફૂલ વિશે
ઘણું બધું જાણો આ એકજ જગ્યા પર
Birds and Rivers
Birds are the most abundant group of vertebrate wildlife in all the natural environments in Spain. Rivers, far from being the exception to this rule, are home to many bird species: some go there to eat, or to nest or to rest, others follow the course of a river, using it as a migratory route to travel between Europe and Africa.
Migrations
Birds are clearly present during the wintertime. Leafless trees reveal these inhabitants, who are also more abundant and, generally, larger than those that are usually found in fairer weather. However they are not so easy to see in spring and summer, but they can be heard singing among the leaves that protect them. Identifying these birds by their song is a complex task for all but the experts.
Migratory birds
The great black cormorant, which breeds and spends summer in North-eastern Europe, is a migratory bird that is common in Mediterranean countries, where the climate is more temperate.
અહીં આપેલ વેબ સાઇટ પર ક્લિક કરો એટલે એક પેજ ખુલશે તેમાં તમે જે પક્ષી પાર ક્લિક કરો તે પક્ષી નો અવાજ સાંભળવા મળશે.
નીચે પક્ષી ના મોટા ફોટા અને માહિતી પણ આપેલ છે.
ગુજરાત ના વિવિધ પક્ષીઓ ના ફોટા સાથે માહિતી માટેની PDF ફાઈલ માટે અહીં ક્લિક કરો
Summer Birds
Climate Change
The warming of the planet over recent decades is causing significant changes in the structure and functioning of natural systems, as well as in the way they work. In the context of the Mediterranean region, it is difficult to identify those changes related to climate change that may have occurred in the rivers of the region, as they are already highly regulated and have been altered by excessive catchment areas and a wide range of infrastructures. Recent studies however indicate that low river flows and the frequency of extreme events are increasing, from droughts through to floods. With respect to birds, mating calls and reproductive activity are now being detected one or two weeks' before they were previously, while migrations are also beginning and ending both earlier and later. This often leads to timing issues when it comes to the availability of food sources, whether plant (fruit) or animal origin (the emergence of aquatic insects, the activity of amphibians, rodents and other bird species, etc.).
નીચેની લિંક પર ક્લિક કરતા એક પેજ ખુલશે તેમાં વિવિધ નદી અને માછલીઓના ફોટા અને માહિતી જોવા મળશે.
There are some 32 native fish species in Catalonia that live, at least some of their lives in fresh water. There are also at least 25 non-native or allochthonous species that are well-established here. The dominant species vary along the course of the river. In the same river basin different fish will be found living in specific areas that are defined by their environmental requirements: temperature, the speed of the river, the type of substrate, etc.
Many native fish are in regression and in a fragile state of existence. All are affected, in one way or another, by problems related to the over-use of water, poor connectivity and competition with invasive species.
Obstacles to Fish Migration
The movements of fish are affected by water shortages, pollution, and hydraulic structures, such as dams, locks, fords, walkways, irrigation pumps, etc.
નીચેની લિંક પર ક્લિક કરતા એક પેજ ખુલશે તેમાં વિવિધ જીવજંતુઓના ફોટા અને માહિતી જોવા મળશે.
Riparian Vegetation
River banks and the areas around them have their own plant life, which is called riparian vegetation. It forms a characteristic border that follows the course of the river. Riparian woods include a wide range of flora and fauna. This plant life has an important role in the ecosystem, and acts as:
- A refuge for animals and plants
- A biological corridor or ecological connector
- A source of food for the ecosystem
- A filter for water pollutants
- A stabiliser for the banks and a barrier in times of flooding (slowing rising water and retaining sediments, etc.)
- A means to aid the re-filling of aquifers
- A regulator for the amount of sun on the river and of water temperature
Invasive Species
Human intervention (wood cutting, earthmoving, etc.) and other disturbances give invasive species the opportunity to settle on river banks. These species are a significant threat, as they replace native species and may cause important changes to the riparian environment. They sometimes form mono-specific populations without any natural value. Invasive species need to be controlled and more importantly, new introductions need to be prevented.
*Invasive species are considered to be those that proliferate in an area in which they are not native and where they have appeared due to the actions of Man.
નીચેની લિંક પર ક્લિક કરતા એક પેજ ખુલશે તેમાં વિવિધ વનસ્પતિઓના ફોટા અને માહિતી જોવા મળશે.
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