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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 given line graph illustrates the population trends of different wild bird species in the United Kingdom from 1970 to 2004. It categorizes the birds into four groups: coastal species, woodland species, farmland species, and all species combined.
It is evident that coastal species experienced a steady increase, reaching their peak in the early 2000s. By contrast, farmland species showed a sharp and continuous decline, dropping to almost half of their 1970 levels by 2004.
The woodland species exhibited fluctuations but generally remained below the baseline of 1970. Meanwhile, the overall bird population remained relatively stable, showing only minor variations throughout the period.
In summary, coastal birds flourished, while farmland birds suffered significant declines. The trends suggest that environmental or agricultural changes may have negatively impacted farmland species, whereas coastal species thrived over time.
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