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The image features a line graph titled "Population of wild birds: 1970-2004" focusing on the United Kingdom, plotting indices for four bird population categories, depicted over the years 1970 to 2004. The vertical axis ranges from 50 to 140 (index = 1970 = 100), and the horizontal axis represents time. Each category's bird population is represented by a specific line: Coastal species (20 species), All species (111 species), Woodland species (33 species), and Farmland species (19 species). Initially, in 1970, all categories start at an index of 100. Patterns vary distinctly among categories through years:
1. Coastal species index shows a fairly steady increase, starting at 100 in 1970, dipping slightly in the early 1970s, then climbing gradually, reaching around 120 in 2004.
2. All species index begins at 100 in 1970, decreases slightly to below 100 by 1976, fluctuates mildly around this range, and ends near 100 again in 2004.
3. Woodland species index starts at 100 in 1970, exhibits some fluctuation, dipping to approximately 90 by mid-1970s, recovering to 100 by 1980, with slight rises and falls, ending just below 100 by 2004.
4. Farmland species index begins at 100, shows a sharp decline to about 60 by mid-1980s, and maintains a relatively flat trend but slightly recuperates, closing near 70 in 2004.
Given the complexity of the image, the above description may not be entirely accurate.
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The line graph represents the population of various species of wild birds in the UK from 1970 to 2004.
Overall, there is a positive trend for all species of birds through the given period. However, coastal species have risen steadily in population, but both woodland and farmland species have declined.
The total population of all wild bird species in the UK has remained relatively stable over the past two decades, despite significant drops from 1977 to 1979 and 1982 to 1986. However, their numbers have improved since 1994. The number of coastal species had a steady rise and reached its peak at approximately 140 in 1986. However, it fluctuated throughout the rest of the period.
The population of the woodland species had grown from the index point to 1972 and it plateaued at about 110 between 1972 and 1974 followed by negative fluctuation through the period of time. There was a dramatic decline from 1977 to 2004 in the amount of farmland species before a rapid increase from 1970 to the peak in 1977.
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