BioSCANBioSCAN
Teacher Notes : Checking Out Local Plants and Animals in Public Spaces and Gardens
1
Aim The aim of BioSCAN is
to support monitoring of neighbourhood wildlife through biodiversity
checkpoints centred on the local school. The common objective is to
provide schemes for people to implement long-term projects to record
seasonal changes. In particular, schemes of work match the varied
opportunities, and restrictions of school environments, ranging from the
enclosed urban tarmac of the inner city, to the open countryside of a
village. A common issue is the long term security of living indicators. In
this connection, the most vandal-proof resource is a mowed lawn, which is
monitored regularly to maintain its dandelions, buttercups and daisies and
sustain a grassland insect population! In many urban schools the only way
to grow things is to use containers. Whatever scheme is chosen the common
objective is to make records. The basic record is a neighbourhood nature
diary. Some of the schemes allow records to be entered into a national
database for long term geographical comparisons to be
made. Another specific aim
of BioSCAN is to bring the study of the plants and animals in public
spaces and gardens into the curriculum. Plants encountered by most people
on a day to day basis are in gardens and parks. Very few of our garden
favourites are natives of Britain. Yet they contribute to local
biodiversity, maybe as 'garden escapes', but also, even if they never set
seed, through their support of 'native' animal life as homes and food.
Foreign ornamentals, because of their striking colours and shapes are
memorable teaching materials, particularly when backed up with information
about their place in history, ecological origins, and general principles
on growth and reproduction. In this connection, named garden varieties
have the advantage of being comparable across the country. Native plants
are not neglected, and in the inner cities, weeds of derelict land and cut
grass may account for most of a neighbourhood's biodiversity. From this
aspect, BioSCAN treats weeds as resources One of the limiting factors in monitoring wildlife is most people's lack of taxonomic skills. This is overcome with a nature diary for recording things which most people know, either in broad categories of types, such as butterflies, or as individuals, such as hedgehogs. Also, experience has shown that being commonplace does not ensure survival, and keeping an eye on common things is important in the long-term. The comprehensive BioSCAN menu is given in Fig 1.
Value With the recent search for evidence for global climate change, the consistent keepers of nature diaries have been catapulted into the scientific arena because of their long-running sets of data on such things as, birds visiting gardens, flowering times of plants, and increases in the girth of trees. These show unmistakable trends indicative of local warming for places as far afield as Vermont and Surrey.
Fig 1 The BioSCAN menu
3 Charting the
Seasons A significant contribution can
be made over the years by answering questions such as: - when do the first swallows
arrive? - when do plants flower in our
community?; - what aspects of the local
environment could influence the timings? BioSCAN is a local Welsh expression of the national 'Phenology Network Pilot Scheme' which aims to establish a national network of biological check points to record the annual timings of 'biological firsts'. 'Phenology' is the study of life-cycles. The long-term objective is to gather information about trends in biological processes which are timed by the seasons and provide an early warning of the decline in local wildlife. Already this kind of information is being used to test theories about global warming, and the local impact of atmospheric pollution. The time- commitment can be as little as a once a year check on the girth of a roadside tree, or a regular flower-check during the school lunch break, to a long-term experiment on the influence of pot size, growing medium, and position, on the life-cycles of different ornamental cultivars. 4 The Bigger
Picture Questions about seasonal
activities of living things are at the root of biology. In the 17th
century these questions initiated accurate field observations to define
the annual timing of plant and animal development, and raised questions
about why there are differences from year to year, and place to place.
Some of the earliest work of this kind took place in the botanical gardens
of Upsala University where, over 200 years ago, Linnaeus and his students
produced regular seasonal lists of the first appearance of local flowers
in field and garden. These were called "Calendars of Flora". This kind of
activity led in England to the keeping of nature diaries by countrymen,
such as Gilbert White, who was the parish priest in the Hampshire village
of Selborne. British calendars tended to emphasise life cycles of birds,
and seasonal changes in gardens . These calendars or diaries not
only recorded the sequence of biological change from year to year, but
were also the basis of speculations about the underlying biological
systems and their controls. For Linnaeus and his followers, an important
motivation was knowledge to augment economic gains from the exploitation
of natural resources. Amateur naturalists, like White, were motivated by a
desire to live in peaceful coexistence with other organisms. These two
threads of ecological history are still with us. Globally, they are at the
heart of our dilemma to proceed with world development, whilst trying to
maintain a sustainable supply of Nature's bounty. Nationally, the need to
balance the two forces is expressed in plans for sustainable development
and biodiversity- the political response to the 1992 Environment Summit in
Rio de Janeiro. To gain maximum value from annual recording of any biological feature requires a long term commitment on behalf of individuals and groups. Hopefully, this 'hands-on' experience with seasonal and year to year changes in neighbourhood nature will stimulate individuals to interact more widely with their local council's sustainable development, and biodiversity action plans (the Local Agenda 21). 5
TreeSCAN Amenity
plantings Amenity trees are
important local symbols of sustainability. Through their longevity, trees
provide continuity between human generations; through their function as
ecosystems in their own right, local wildlife depends on them either for
food and shelter, or simply as a place to become attached to. Every tree
is therefore important, and for most of us, a day to day affinity with
nature can only come through an awareness of the scattered trees in our
streets, parks and gardens. Indeed, the first step in the government's
strategy for sustainability and biodiversity is to increase awareness of
the commonplace plants and animals that we pass day by day, but do not
see. 'Tree SCAN' can begin
with the simple survey form for 'street trees' in SCAN's Key Stage 2 pack.
Then, 'Trees Are Like People' provides an identikit to record the
character of individual trees, and the timing of important events, such as
'bud-burst', from year to year. Local results may be added to a national
SCAN database to make geographical comparisons. There is also support
material to integrate practical work on trees, and wood, into a range of
subject attainment targets, and to support 'Trees' as a cross-curricular
topic, in Key Stages 1 and 2. Hedgerows Environmental
management and hedgerows go together. A good hedge takes longer to create
than a stone wall but, once established, it becomes an enduring feature,
perpetuating itself year by year, increasing in its diversity. With or
without trees, with good management, it becomes the chosen habitat of many
species of plants and animals. Its loss, or mismanagement creates a new
imbalance in nature. The hedge is not only beautiful in itself, a scene
which changes with the seasons, it has an economic value. For centuries it has played its part in the rural scene, a resource to be husbanded by generation after generation for its fuel, fodder, food and herbal remedies. As an historical record, and as a nature reserve, there is little dispute that the hedgerow provides the best possible statement of the seasonal balance which exists between people and the natural environment.
6
FlowerSCAN Gardens (i)
Anthometers An 'anthometer' is a
collection of easy to grow shrubs and/or perennial garden plants, each
flowering at a particular time during the year, and reliably from year to
year. Anthometers are used to make year on year biological checks on the
local environment which are expressed in year to year variations and
trends. The idea is to maintain a 'flower station' analogous, and
complementary, to a 'weather station'. The plants may also be used for
experiments on factors which affect growth and reproduction, to learn
about biogeography, and study gardening as an important cross-cultural
expression of human development. For some city
schools, a container-garden is the only option. Setting up an anthometer
with plants in pots offers great scope and versatility for integrating
recording with experimentation. It is also advantageous to grow plants in
containers when making geographical comparisons because the growing medium
can be standardised. However, container growing is not simply a matter of
thrusting garden plants in pots and expecting them to thrive. As the
plants are grown in a limited amount of soil, with their roots confined,
they have special requirements. Suitable species must be chosen initially,
as some tolerate this restriction better than others. Taking these
limitations into account, a calendar of flowering shrubs may be
established with potted plants and used to check out flowering times of
species, and/or named varieties, from early spring to midsummer. This has
to be linked with a long-term management plan to care for the plants, and
a database for recording and transmitting
results. (ii) Caring for
cranesbills A flower calendar may
be organised with a particular group of perennial plants which thrive in
containers. For example, the group of easy to grow, hardy cranesbills (the
scientifically defined geraniums: Genus; Geranium), provide opportunities
for comparing the seasonal diversity of a successful group of closely
related plants which have widely colonised the north and south temperate
climatic zones. (iii) Weed
watch 'Weed watch' is a set
of procedures to record the local biodiversity bank of air-borne weeds by
checking walls, pavements, home gardens for successful colonisation, and
keeping an annual patch of bare soil as a germination site. This facility
may also be used to select genetic variations for further study, from
seedlings of a particular species, such as plants that flower in
lawns. ( iv) Cut grass
(GrassSCAN) Cut grass in parks, roadside verges, school playing fields and garden lawns is of limited educational value when approached as a collection of species. 'GrassSCAN' approaches mowed grassland from the opposite direction; as a universally accessible model of ecological management. From this viewpoint, the first task is to determine the management objectives for the patch. The objectives may vary considerably e.g. from maintaining a uniform velvety ornamental grass monoculture to maximising the lawn's species diversity, of say earthworms, or dicots. The next step is to set up a monitoring programme based on indicators by which the success of the management plan may be judged. These indicators, such as 'sward height', a list of the weed species, or the number of daisy flowers, will depend on the management objectives. From another angle, a management plan could be written to run an experiment where a mowed lawn is used to demonstrate an important ecological principle, such as competition between grasses and clover. In all cases the aim is to measure year on year trends and variations of mowed grassland as a managed ecosystem.
7
WildSCAN This is a variation
on a scheme established in 1994 by Mendip District Council to engage local
communities in checking out their local biodiversity. The Mendip pack
enables individuals or groups to survey a local area for twenty species
that were chosen because they indicate habitats of high wildlife value. A
fair level of skill is needed for this work, and it does not involve
people who live in places where these indicators do not occur. The SCAN
nature diary project develops this scheme to draw more
unskilled, yet concerned people, into neighbourhood wildlife surveillance,
using a wider range of general indicators of local biodiversity, and a
more flexible method of diary recording. Spring
firsts This project is part of the National Phenology network co-ordinated by the Institute of Terrestrial Ecology to check for trends in the dates of events such as flowering times, arrival of migrating birds and spawning of amphibians. 8 Outline of a Community
Biodiversity Action Plan There are three
dimensions to a local biodiversity action plan. One is the community's
contribution to the top-down strategy of the county/district council BAP
for conserving rare or characteristic
species. The second approach is from the bottom-up
where all living things count.- from weeds in the garden to the odd patch
of buttercups on a roadside verge.
The third way forward is to organise the contributions that
families can make to the national climate change
network. The local school is
well-placed to take a lead in the bottom-up approach, because it can
orientate its work for the national curriculum towards the practical ends
of the plan, and its IT
capability is valuable in managing data collection and environmental
improvements. In outline the
community has to:- 1 Select the following
habitats:- -
ponds; -
hedgerows; - roadside
verges; -
commons; - places dominated by
trees; - the
churchyard; -
gardens. 2 Decide what features you would like to protect, enhance or
introduce. 3 List the factors
limiting the features you would like to protect, enhance or
introduce. 4 Decide what you
have to do to remove the most important limiting factors (this is the
action plan). 5 Decide what you
have to measure in order to check that your action plan is effective (this
is the monitoring programme) To take the third
approach you have to join in the National Phenology Network being
organised by Tim Sparkes of the Institute of
Terrestrial Ecology at
Huntingdon. The special SCAN
contributions to this are:- - Tree SCAN, where every tree in the
community is mapped and its times of leafing, flowering,
and leaf-fall are recorded, together with its girth
and general health, are
measured each year; - the SCAN anthometer
network, where a selection of perrenial garden
plants is used for making
year on year nature diaries of flowering times,
fruiting capacity and pest attack.
8
Support ·
Two free CDs ('Nature Quest' and 'Sustainability
for Teachers') are available which contains practical schemes, and an
interactive back-up library. ·
There is a web-site for updating the schemes, and
communicating with all schools in the BioSCAN network to share ideas and
help develop the project (www.scan-online.org). |
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