A pond is a small area of still, fresh water. It is different from a river or a stream because it does not have moving water and it differs from a lake because it has a small area and is no more than around 1.8m deep.
What is a Pond?
A pond is a small area of still, fresh water. It is different from a river or a stream because it does not have moving water and it differs from a lake because it has a small area and is no more than around 1.8m deep. Some ponds are formed naturally, filled either by an underwater spring, or by rainwater – sometimes known as ‘dewponds’; other ponds are man-made.
If a pond is to be a successful habitat it must have native plants growing in it. They provide food, oxygen and shelter for the animals. Green plants need sunlight to make their food (photosynthesis) so a pond in the open will be more successful than one in the shade. The smallest plants in a pond are the microscopic phytoplankton and these provide most of the food in a pond. The phytoplankton and larger algae form the first part of the pond’s food chains. Plant-eating animals – the herbivores – eat the plants and the herbivores are eaten by carnivores (meat eating animals).
Pond vegetation grows in areas called zones. Plants such as great willowherb and meadowsweet grow in the bankside zone: they like damp places but are not true water plants. The emergent plants grow nearest to the pond edge in the marsh zone e.g. yellow iris and mud-sedge. These fringing plants provide good hiding places for some pond animals such as young frogs, and the tall stems are used by dragonfly nymphs when they climb out of the water before emerging as an adult.
In the aquatic zone live the truly aquatic plants. Some of them float on the surface with tiny roots dangling in the water e.g. duckweed and frogbit. Others have their roots buried in the mud at the bottom of the pond and their leaves float on the surface e.g. water-lilies and crowfoot.
Then there are fully submerged plants such as starwort and spiked water milfoi. These produce most of the oxygen so it is important that they receive plenty of sunlight (oxygen is produced during photosynthesis). If the plants on the surface are completely covering the pond then some of them should be pulled out or the submerged plants will suffer.
Some species of pond plants, such as the water-violet, are becoming very rare indeed.
Life in a Pond
A pond is a fascinating habitat to study, a good one teeming with a great variety of both animal and plant life. The community (all the species of animals and plants present) in one pond may be quite different from that in another, even if the ponds are close together.
This is because most pond animals cannot travel from one pond to another. Also the water temperature, oxygen content, water cleanliness and the material of the pond bottom have an influence on the kind of life present. In any pond it is essential that there is a balance of different kinds of organisms so that there is enough food for them all to live and reproduce.
More than 1,000 species of animals live in ponds – although you are unlikely to find all of them in any single pond. Almost every group of living creature is represented, except starfish which live only in the sea. In a large pond you may find mammals such as water voles and water shrews – and birds like ducks, herons and kingfishers.
Even the smallest pond will have a population of amphibians (frogs, toads and newts), small fish e.g. sticklebacks, and a huge variety of invertebrates (minibeasts). Some of these are herbivores such as water fleas and snails, whereas others are aggressive carnivores, hunting down their prey, the unfortunate herbivores! One of the largest invertebrate predators in a pond is the great diving beetle – no tadpole is safe when one of these hunters is around! Find out about another pond dwelling creature on our factsheet Dragonflies.
Many different food chains are to be found in a pond because each animal eats different things.
Endangered Pond Animals
As with any habitat, if ponds are in danger of disappearing then it follows that the wildlife in them is also endangered. Some of Britain’s pond animals are already officially on the list of rare animals, fully protected by the Wildlife and Countryside Act 1981. The great-crested newt and natterjack toad are the two officially endangered species of amphibian, but even the common frog is not nearly so common as it used to be. The many species of dragonflies are also becoming increasingly rare – the Norfolk Aeshna is on the list of Britain’s endangered species of insects.
According to the IUCN Red List of Threatened Species:
The Norfolk Aeshna, also known as the Norfolk Hawker (Aeshna Isosceles), is rare and endangered.
There are 63 species of dragonly listed in the IUCN Red List of Endangered Species. Of these, 2 are endangered, 6 are vulnerable, and 6 are near threatened.
The great crested newt, also known as the northern crested newt is listed as least concern by the IUCN Red List of Endangered Species.
The natterjack toad and the common frog are also classifed by the IUCN as least concern.
Ponds - Past and Present
For centuries, ponds were an essential part of people’s lives and nearly every village and farm in Britain had a pond. The water was used by both humans and animals but as technology advanced and water became available at the turn of a tap, many ponds were neglected. Since most ponds were man-made, when abandoned by humans they were taken over by nature; plants at the edges took over where there were no farm animals to trample them down and some ponds ended up as marshy bogs. Fallen leaves choked ponds and the oxygen vital for pond-life, was used up as they decayed. Other ponds have been destroyed by pollution or drained and filled in to make way for buildings and farmlands.
All these problems have meant that most of Britain’s original ponds have disappeared – 50 years ago there were twice as many ponds as there are today. Ponds of our countryside are an endangered habitat.
Pollution of Ponds
The water in a pond must remain clean if it is to provide a healthy environment for the organisms (animals and plants) living in it. The natural waste from the living and dead organisms is ‘recycled’ by special tiny organisms called bacteria. Plenty of oxygen is needed for the bacteria to ‘break down’ the waste. The pond can take care of its own waste – it’s people who cause pollution!
The most noticeable kind of pollution is the dumping of rubbish – anything from old cars and drinks cans to bikes and bottles have been found cluttering up ponds. This not only makes the environment look so unsightly but it may also destroy pond-life.
Perhaps the most serious threat to ponds is chemical pollution as a result of modern farming methods. Over the years fields have been sprayed with pesticides to rid the crops of pests. However, rain often washes the excess chemicals off the crops into nearby ponds, streams or rivers, poisoning some of the animals living there. Fortunately, these poisonous chemicals are not used so freely now and, hopefully, this problem will gradually be reduced.
Another, equally serious, problem connected with agriculture is the use of artificial fertilisers. Powdery chemical fertilisers, containing nitrates, are put on the crops to help their growth but they can also be washed off by rain into nearby ponds. They do not poison the wildlife but the rich supply of nitrogen causes the water plants, especially algae, to grow very quickly. The plants use up so much oxygen during the night and during decaying processes that there is none left for the other pond-life. The growth also prevents sunlight reaching the organisms below. Eventually, all the algae die leaving a smelly, decaying mass. The case of excess nitrates in water is called eutrophication.
Protection of Ponds - How can you help?
We can all help ponds and their wildlife in some way. Here are a few practical ideas:
Have a look around your neighbourhood and see if you can find any ‘wild’ ponds. If you think a pond needs improvement e.g. rubbish or plants removing, perhaps you and some friends or family could try to renovate it. It is best to ask for advice and help on pond management from professional organisations. The British Trust for Conservation Volunteers (BTCV) organises practical work in the countryside for young people and it devotes special attention to the restoration and conservation of ponds: Your local Wildlife Trust may be able to help you too.
By the way, ponds can be deep, so take great care and never go alone! It’s best to persuade an adult to go with you and help.
Pond-dipping is a lot of fun and a good way of finding out just what is living in a pond. A wide variety of creatures would indicate that a pond was healthy. However, always remember that the most important thing is the safety of the animals. Return them to the pond as soon as you have finished studying them. It is fascinating to collect frog or toad spawn to watch it hatch. If you keep a few tadpoles to observe their development, look after them carefully and return them to their pond when they have grown legs. For more information see our factsheet: Care of Tadpoles and Frog Spawn below.
Create your own pond: About 80% of all Britain’s ponds are to be found in private gardens or school grounds. These are obviously much appreciated by animals such as frogs and dragonflies whose countryside ponds are disappearing. A garden pond designed with wildlife in mind is an exciting and worthwhile project to undertake – and not difficult if you have someone to help you. You will be surprised just how quickly animals are attracted to the newly-filled pond. Other garden residents will welcome the water for bathing and drinking. You may have birds, hedgehogs, mice, foxes and bats making good use of your pond. As well as providing a much needed home for some of Britain’s wildlife, you will enjoy watching your pond improve as time goes by. A seasonal diary of pond events makes a good project.
For more information about making your own pond visit our Making a pond factsheet below.
If you already have a pond please help Pond Conservation by taking part in the Big Pond Dip and help find out what is living in garden and school ponds.
Image: Ponds by Nick M
Information sourced from:
Norfolk Wildlife Trust (2014), Wildlife in Norfolk [online], Available from: https://www.norfolkwildlifetrust.org.uk/wildlife-in-norfolk/species-explorer/freshwater-invertebrates/norfolk-hawker [accessed 14/07/2015].
The IUCN Red List of Threatened Species (2015), Triturus cristatus [online], Available from: http://www.iucnredlist.org/search [accessed 14/07/2015].
The IUCN Red List of Threatened Species (2015), Epidalea calamita [online], Available from: http://www.iucnredlist.org/search [accessed 14/07/2015].
The IUCN Red List of Threatened Species (2015), Rana temporaria [online]. Available from: http://www.iucnredlist.org/search [accessed 14/07/2015].