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The range-change map for the Dark-capped Bulbul is massively GREEN. 443 quarter degree grid cells (58%) of the range is GREEN, where reporting rates have increased between SABAP1 and SABAP2. This is one of the GREENest species. Most species with increasing reporting rates also show range expansions. This species has a range expansion of only 4%, ie only 4% of the cells are BLUE on this map.
So for the Dark-capped Bulbul, the story seems to be quite simple. There have been increases in abundance (and therefore reporting rate) over much of the range. But the range has stayed much the same. The ranges of the the three Pycnonotus bulbuls (Cape, Red-eyed and Dark-capped) seem to be maintaining the historic boundaries between them, but all three are showing increases in reporting rates, and many of these are massive.
The explanation of the increase in reporting rates is likely to be the general thickening of bush that has taken place through most of the range of the Dark-capped Bulbul. This species occurs wherever there are trees and shrubs that produce fruit. And, clearly, there are a lot more of these than there were two decades ago!
The photo above is from the BirdPix Virtual Museum, and it was submitted by David Kennedy. It is BirdPix record 2597, and here it is in its Virtual Museum context vmus.adu.org.za/?vm=-2597.