The linear graph highlights the information about how the number of wild birds, categorized in four groups in the UK has changed over a 35- year period from 1970 to 2004 in comparison with the initial quantity in 1970 which is assumed as 100.
Overall, at first glance, it stands out from the graph that coastal species showed an upward trend, while this was downward for farmland species and woodland species and total number of birds fluctuated around original number only with an insignificant change.
Looking into details, as for coastal species, despite increasing significantly to nearly 138 in the first half of the period until 1988 with a surge in this year, it then levelled off in this figure for at least 3 years. Following this, it experienced a marginal rise hitting the peak of 139 in 1991, which is the highest number that a bird kind have had over the whole period. Then, in spite of showing a plummet to around 130 1993, this number then went up over three consecutive increases to 138 in 1996. Consequently, having fallen negligibly to 132 in 1997, it then showed two successive and insignificant growth to 138 in 2003. Finally, by making a slight decline in the final year of the period in question, it remained the prevailing bird group.
As regards farmland species, despite improving considerably over the first 7 years reaching to a figure above 110, it then plummeted to 65 in 1987. After remaining stable for a year and even witnessing a marginal rise to below 70 in 1990, it then decreased dramatically hitting the trough of approximately 54, this figure then made an insignificant increase to 58 in 1999 and remained constant for the rest of the period.
If we look at woodland species, it has always fluctuated between 80 and 110 with a slight rise at the end to 83 at it’s highest drop, making it almost always a category with the second highest population. In terms of overall number of birds, its trend also has been fluctuating with a difference in amplitude of changes that has been around 100 to 110. The other difference is that it finally had a negligible growth to about 114 at its highest increase and it barely came under 100.
The linear graph highlights the information about how the
number
of wild
birds
, categorized in four groups in the UK has
changed
over
a 35-
year
period
from 1970 to 2004
in comparison
with the initial quantity in 1970 which
is assumed
as 100.
Overall
, at
first
glance, it stands out from the graph that coastal species
showed
an upward trend, while this was downward for farmland species and woodland species and total
number
of
birds
fluctuated around original
number
only
with an insignificant
change
.
Looking into
details
, as for coastal species, despite increasing
significantly
to
nearly
138 in the
first
half of the
period
until 1988 with a surge in this
year
, it then levelled off in this figure for at least 3 years. Following this, it experienced a marginal rise hitting the peak of 139 in 1991, which is the highest
number
that a
bird
kind have had
over
the whole
period
. Then,
in spite of
showing a plummet to around 130 1993, this
number
then went up
over
three consecutive increases to 138 in 1996.
Consequently
, having fallen
negligibly
to 132 in 1997, it then
showed
two successive and insignificant growth to 138 in 2003.
Finally
, by making a slight decline in the final
year
of the
period
in question, it remained the prevailing
bird
group.
As regards farmland species, despite improving
considerably
over
the
first
7 years reaching to a figure above 110, it then plummeted to 65 in 1987. After remaining stable for a
year
and even witnessing a marginal rise to below 70 in 1990, it then decreased
dramatically
hitting the trough of approximately 54, this figure then made an insignificant increase to 58 in 1999 and remained constant for the rest of the period.
If we look at woodland species, it has always fluctuated between 80 and 110 with a slight rise at the
end
to 83 at it’s highest drop, making it almost always a category with the second highest population. In terms of
overall
number
of
birds
, its trend
also
has been fluctuating with a difference in amplitude of
changes
that has been around 100 to 110. The other difference is that it
finally
had a negligible growth to about 114 at its highest increase and it
barely
came under 100.