Two and a half years is rather a short time to be looking at population trends.
Given that, from the 3-year 2007-2009 graphs, there appears to be a general downward trend in bird population (the pink line) in all four locations.
Species numbers (the blue line) appear to have increased from 2007 in at least Tai Po Kau and Shing Mun but this may be just because of your greater familiarity with the territory.
I would be interested in your own comments on these two observations and anything else you think should be pointed out.
Is the decline in population, if it exists, limited to a few species in each place, or a general decline?
Finally, was there an invasion of one or more species causing the large increase in bird numbers in Tai Po Kau at the beginning of this year?
The consistent recording of information is clearly of great value.
[ Last edited by wgeoff at 14/07/2009 17:34 ]
