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December 12, 2006

 

 

 

 

Biodiversity - A definition from:

World Resources Institute, World Conservation Union, and United Nations Environment Programme, "Global Biodiversity Strategy," 1992:

"Biodiversity is the totality of genes, species, and ecosystems in a region... Biodiversity can be divided into three hierarchical categories -- genes, species, and ecosystems -- that describe quite different aspects of living systems and that scientists measure in different ways.

Genetic diversity refers to the variation of genes within species. This covers distinct populations of the same species (such as the thousands of traditional rice varieties in India) or genetic variation within a populations (high among Indian rhinos, and very low among cheetahs)...

Species diversity refers to the variety of species within a region. Such diversity can be measured in many ways, and scientists have not settled on a single best method. The number of species in a region -- its species "richness" -- is one often- used measure, but a more precise measurement, "taxonomic diversity", also considers the relationship of species to each other. For example, an island with two species of birds and one species of lizard has a greater taxonomic diversity than an island with three species of birds but no lizards...

Ecosystem diversity is harder to measure than species or genetic diversity because the "boundaries" of communities -- associations of species -- and ecosystems are elusive. Nevertheless, as long as a consistent set of criteria is used to define communities and ecosystems, their numbers and distribution can be measured..."

http://ceres.ca.gov/biodiv/Biodiversity/biodiv_def2.html

Perhaps a simpler explanation:

Biodiversity is the latest 'buzz' word in conservation. It is short for biological diversity and it means 'The variety of life on Earth'. It is used as shorthand for all of the different species and habitats in an area. Biodiversity is essential to our lives in all sorts of ways, providing economic, social and environmental benefits. Biodiversity also enriches our lives - it makes the world a better place to live in.

http://www.rspb.org.uk/biodiversity/index.asp

So how is this garden contributing to "Biodiversity"?

It started as a bramble covered hillside with Ash, Willow, Hawthorn and Quickthorn as tree cover. There were no bluebells present. The land was species poor. Originally it would have been part of the farm with a path, which is discernable today up to a well for the farm (this is on next doors land). This was the state it was in in 1989 when this was bought (although the land on the hillside was bought separately).

Clearing the brambles and some of the trees was the next task, even a crop of King Edward potatoes were used to clear the land. Most of the snake bark Acers, Metasequoia, Ceanothus arboreus and Acacia were planted from 1990 to 1992. Rhododendron hybrids, Magnolia, Halesia, Spartium under planted these trees. Not a great deal was done with this steep slope until 2002 when it was decided to maintain this area more as a wildlife garden and not have any formality to its structure.

Plant species diversity has been the ethos and principle behind all recent plantings, but even though the plants are not native ones, with a careful choice to ensure they do blend into the overall ecosystem. The majority of native species have also been encouraged, but still managed to ensure they do not upset a balance which is still man made. Do natural ecosystems actually exist now on this planet? In this country it is doubtful, so one does not apologise for the overall effect created.

By carefully managing the plant species, it will be interesting to see the effects on wildlife in general. An apiary of three hives has been established and hopefully this will indirectly and directly increase biodiversity not only in this garden, but in the surrounding area.

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First hive
2nd flush of Red Campions
2nd pool October 2003
Autumn colours 2003
Looking up to apiary
Bird feeders have now been set up over the winter period, this has been done before 5 years ago. Then both green and spotted woodpeckers were common visitors. Nuthatch, sparrow hawk, siskins were also noted. It will be interesting if these birds start to take an interest in the food provided. A bird bath has also been set up but as yet one has not noticed this being used, even in the very dry spells of the summer. Perhaps the other pools provided sufficient water and somewhere to "bathe".
         
         

The following features in this garden help wildlife:

  • berry-bearing plants have been planted.
  • seed heads are left on plants to provide food.
  • log-piles have been provided for insects and other invertebrates.
  • piles of leaves are left to provide winter homes for insects and nesting materials for hedgehogs.
  • ivy is allowed to climb trees.
  • bird feeders have been set up October 2003.
  • bird bath provided (July) 2003.
  • all weeds when pulled out are left nearby to rot.
  • only the following plants have been treated with insecticide due to leaf cutters: Polygonatum multiflorum and Magnolia 'Star Wars'.
  • no slug killer has been used on the "wild" part of the garden only around the hostas in the more formal part of the garden
  • several pools have been created - the largest has been in existence since 1994, the small pools on spring lines have been made during June/July 2003.

These points above need to be reviewed in relation to work done by the BUGS project, Department of Animal and Plant Sciences, Sheffield University. For a summary of this research project - see thoughts. This has been paraphrased and summarised (with permission) from an article published in "The Garden" Journal of the RHS, vol. 129, part 5, May 2004. This particular volume has been dedicated to Biodiversity and gardening - a very significant contribution to this topic - the RHS should be congratulated on highlighting and bringing together such articles into one volume. Let us hope that further articles are forthcoming in the near future.

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Logs left for insects and amphibians
Crataegus berries for birds
Silene and Digitalis seed heads left
Hedera left to grow up trees
Compost heap left on boundary
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Bottom pool 24th Jan. 04
       
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Flowering Hedera late in the year for the bees to work
Seed and peanut feeders
Coal tit eating seeds
Coal and blue tits feeding on the newer larger feeders
At least 8 birds on feeders Dec. 14th 03

Nov. 17th 03 - the birds are eating the bird seed at such a rate that the feeders need filling every day, amazing! Coal and blue tits are the main visitors, but finches are frequent. Around the feeders there is always a robin, blackbird and thrush.

The largest pond is now being cleaned of surface growth and leaves, ready for the frogs and toads which have appeared as early as January in previous years. All material from the pond is left on the edge of the pond for any aquatic animals to easily find their way back. (top)

Dec. 14th 03 - frogs are already in the largest pond. The birds mostly tits and finches are eating the seeds from the feeders at an amazing rate - the feeders have to be filled almost every day and 8 fat balls disappeared in one week. By the way there are no squirrels feeding on these yet! A black bird is a constant visitor beneath the feeders including two cheeky robins. Collared doves also visit to take some of the seed. Bees are madly working the Mahonia if it is sunny for a few hours around midday. I Red Admiral (Vanessa atlanta) seen on Mahonia.

Dec. 23rd 03 - miserable with heavy sleety showers, but as a compensation the bird feeders have been incredibly busy. Very difficult to give accurate figures of how many birds have visited, but the surrounding bushes have been like an aviary. One had the pleasure of watching these birds and it was especially pleasing to see the Greater Spotted Woodpecker (Dendrocopus major) consuming peanuts and attacking the fat balls. The following species were noted at 3 p.m. over a half hour period:

Greater Spotted Woodpecker (Dendrocopus major)
Collared Dove (Steptopelia decaocto)
Dunnock (Prunella modularis)
Wren (Troglodytes troglodytes)
Robin (Erithacus rubecula)
Blackbird
(Turdus merula)
Song Thrush
(Turdus philomelos)
Blue Tit
(Parus caeruleus)
Great Tit
(Parus major)
Coal Tit
(Parus ater)
Nuthatch
(Sitta europaea)
Chaffinch
(Fringilla coelebs)
House Sparrow
(Passer domesticus)
Jay
(Garrulus glandarius)
Magpie
(Pica pica)

It must be borne in mind that not all of the above were eating from the feeders but were seen around in the close vicinity.

Dec. 30th 03 - Solitary Greenfinch (Carduelis chloris) bullies his way with all the other birds visiting the feeders. Bumble Bee (Bombus terrestris) seen flying from Prunus subhirtella in Criccieth. (top)

Jan. 2nd 04 - Starling (Sturnus vulgaris) seems to have got the hang of attacking the fat balls! Bumble Bees very active on the Prunus subhirtella in Criccieth - at least 6 working the blossom. Honey Bee (Apis mellifera) very active on the Mahonia 'Charity' again.

Jan. 4th 04 - Finches in general seem very fond of eating the flowers and buds of Prunus subhirtella. Solitary moth seen several evenings - last night 6.00 p.m. and previous night. A flock of Long-Tailed Tits (Aegithalos caudatus) descended on the peanut feeders (at least 12 birds).

   
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Perhaps this is the Mottled Umber (Erannis defoliaria) - only a guess and if you can confirm or identify, please contact.

January 26th 2004 - The weather has really turned cold and looks like snow. On Sunday (Jan. 24th) 3 buzzards were above the garden mewing for well over an hour. Honey bees are active whenever there is sunshine and not too much wind. Again on Sunday they were working the Galanthus clumps throughout the garden. No bumble bees have been seen yet, although in a Criccieth garden about 2 miles away, bumble bees have been very active on Mahonia japonica/bealii. The birds eat frantically and no new species have been noted, although when peanuts are spilt when filling the feeders 2 jays come down on the patio area. The long tailed tits are fascinating to watch, little lumps of feather and are quite tame as well.

A further development to increase biodiversity in part of this garden, has been to change the nature of the lawn along side the road. At the moment, this is mowed regularly as a more formal lawn and due to treatment with fertilizers containing herbicides, there are hardly any other species other than Festuca rubra. Even Bellis perennis has been successfully eradicated. This is being redressed and will be managed as a wild flower grassland. The first step has been to heavily dress the area with a mixture of crushed limestone and magnesium limestone to alter the overall pH from an average of 6.0 to hopefully over 7.00. This will allow a wider range of wild species to be planted and maintained. This has now been left to settle until the spring when wild flower plugs will be planted. (top)

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Frog spawn 1st Feb.. 2004
Frog spawn all at one end of pool
Frogs ready to spawn
Frogs everywhere
Frogs mating

February 1st 2004 - Spring is here!! - Frog spawn and frogs mating - straight after last weeks snow (very little here), ice and hard frosts. Camellia flowers lost due to the frosts, but are quickly being replaced by new ones. Hamamelis and the Daphne remain unscathed as does Sarcococca confusa. Galanthus nivalis is at it's best and when the sun comes out, the bees fed on its pollen. The same bird species continue to feed voraciously!
February 6th 2004 - At their height (2nd - 3rd) there were well over 100 frogs mating in the pool, there is much more frog spawn than usual produced. Today there are only a few frogs left(Feb. 9th - only one adult frog seen).
February 15th 2004 - newts seen coming up for air in pond. Few years back all the tadpoles disappeared - was it because of the newts eating them? This was a possibility so I am told. Will it happen again? Bumble bees (3) seen foraging in the garden in the early afternoon - don't know which species though. Honey bees everywhere, working everything in flower; most collecting nectar rather than pollen, the exception being those bees working the Crocus. Birds very active, no new species but a wren seemed oblivious to my presence for most of the afternoon. A number of daffodils are now opening. The Galanthus are nearly over and looking bedraggled.
22nd February 2004 - first cut for lawn.

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Starling on fat ball
Blue tits on feeder
Robin feeding on peanuts
Hamamelis and birds on feeder
Birds on feeder 27 Feb. 04

27th February 2004 - previous week very cold and culminating in this heavy snowfall. Difficult to keep up with the demands of these birds to keep them fed! (top)

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Bird box 1 - put up 1st March 04
Bird box 2 - same date
Overlooking village
Blackcap 21st March
Goldfinch 21st March

Better late than never, first two bird boxes set up on the 1st of March 2004. They face north and are over five feet up an established Fraxinus excelsior trees. There are even instructions for the birds to read! 8th March, three more boxes set up.

18th March 1000 Galanthus nivalis have been bought and planted in the green.

21st March - New bird species noted at feeding stations - a Goldfinch (Carduelis carduelis) and a Blackcap (Sylvia atricapilla). The usual species are still vigorously feeding. Nuthatch and woodpecker made a visit to the peanut feeders.

Paths have been tidied and wooden edging using wood from managed woodlands has been used. This is to stop "creep" of soil due to the angle of the slope of the garden and in the past path have had a tendency to "disappear" after a while.

April - has been an incredible mixture of weather patterns, gales, frost, sleet, frost, snow on mountains, mild/warm. Even at the end of April the wind has turned northerly - yet again and now the temperature is 11-13°C during the day, but no frosts at night. It is disturbing to see that the amazing quantity of frog spawn in the pond has totally failed and probably due to the hard frosts in March. Interesting to see that the Phenology site with an excellent interactive section on climate change in your garden mentions this - well worth a look.
A house martin was seen on the 18th of April, a Cuckoo heard on the 20th April and the Chiffchaff has been singing since the beginning of the month. Honey bees have been extremely active in any sunny spell even if the temperatures have been cold. Three species of bumble bee have been plentiful and very active this month. Some of the larger areas of grass on the side have been strimmed on the side (24th April), areas around young plants have been cleared to ensure that competition does not affect them. The flow of water to all the pools is now much reduced due to the lack of rain and growth of plants especially the trees.
Much tidying has taken place, dead wood removed and all such material has been collected and placed on one boundary to provide more habitats. Red campions are beginning to flower. None of the nesting boxes have been used as yet although a pair of thrushes have nested in the usual Camellia bush by the road. They can be seen going in and out of this bush on a regular basis. They have used this bush for the past five years. Orange Tip Butterflies (Anthocharis cardamines) have been common on warm sunny days and the Bee fly (Bombylius major) has been seen three times.(top)

   
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Bombylius major or Bee fly - parasitic on bumble bees
   

May - the weather has been a mixed affair, some very dry periods resulting in having to resort to watering to save plants on the slope. The springs however have not dried up but with very much reduced flow rate. The grass on the slope has been cut twice, first time with a strimmer, the second with hedge shears. This has allowed one to avoid cutting the leaves of the daffodils.

June - again the weather has been difficult - a period of severe drought where the spring lines have stopped flowing completely. The Embothrium and Cornus kousa has been spectacular and have been worked by a number of bee species and other insects. Planting in general terms has been somewhat curtailed with the result that the area at the back of the house is like a plant nursery. At the end of this month the rains have at long last come but associated with very high winds. These have damaged a number a plants notably a beautiful specimen of Toonia whose top has snapped off. Birds in general have become very quite coinciding with their molting period - quietness is almost unsettling compared to the considerable din of the bird song previously. The buzzards wheel overhead and nest nearby. The bees continue their success and honey has been drawn and is now for sale (absolutely delicious and that is no exaggeration).

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Polygonatum being pollinated by Bumble bee
Iris ensata being pollinated
Cornus kousa being pollinated
Lychis coronaria being pollinated
Surface of pool with high biodiversity

 

P. S. Everyone with collections of Rhododendron, Viburnum, Camellias, any collection of trees should be vigilant and be aware of the symptoms of Sudden Oak Death caused by Phytophthora ramorum. For these details, look at the Defra and Forestry Commission web sites. Hopefully this will not be on the scale of the Dutch Elm Disease or worse. At the moment, very little is known about its distribution in this country in our native trees. It seems to be prevalent in commercial nurseries - over 300 cases recorded with the disease in the UK. This has the potential of being really serious and highlights the fact that we have been far too lax with import of plant material into this country - will we learn a lesson from this? (I doubt it!). Now there seems to be another Phytophthora, unknown in any other country and seems to attack beech and Rhododendrons. This has been named Phytophthora kernovii. Details are again on the Defra web site. This is considered to be a greater threat than Phytophthora ramorum.
"Those who contemplate the beauty of the earth find reserves of strength that will endure as long as life lasts. There is something infinitely healing in the repeated refrains of nature - the assurance that dawn comes after night, and spring after winter" - Rachel Carson.