ADU CWAC CAR SAFRING SABAP2 SARCA
Email: ADU no.: Password: 
Forgot password?   Remember me
biodiversity monitoring everywhere
Cards:21393
Records:464948
Sites:1389
Observers:486
Images:3778

Latest News

Progress with 2016 atlasing in Hessequa by Johan Van Rooyen

Sensational September for SABAP2

The power of citizen science: spinning dials in October

Six million records in the SABAP2 database

SABAP2 at 70% in South Africa, Lesotho and Swaziland

Northern Cape reaches 40% – congratulations to all involved

Only 99 left! Claim yours now

SABAP2 priotrities: October to December 2014

2014 could easily be SABAP2's best year for data collection!

Greater Kruger National Park Challenge – 2014 – the mid-year progress report says "Outstanding"

Two-thirds coverage in 2014 of the Four Degrees of Greater Gauteng reached on 5 July

DAY 1 of YEAR 8 of SABAP2

UCT planned maintenance this weekend: 09h00 Saturday 21 June – 17h00 Sunday 22 June

Colour Rings on Swift Terns

SABAP2 doing awesomely in 2014; today we celebrate the milestone of a "MiniProject"

There is one thing that SABAP2 does better than any similar project, anywhere on this planet

You are awesome, Team SABAP2. You have made 20000 checklists for the Western Cape

Citizen Science Week : Saturday 8 March to Sunday 16 March

SABAP2 up to the end of February, 2014

SABAP2 at the end of the first half of February 2014

One hundred thousand checklists in the SABAP2 database: awesome milestone, well done, Team

Be part of the "Kruger Green Team"

These Four Degrees are on the cusp of a lot of milestones

Increasing in abundance, but not in range – Dark-capped Bulbul

How did we get along in the first half of November?

SABAP1 vs SABAP2: the Rock Dove aka Feral Pigeon

How to submit records to the Virtual Museums

SABAP2 strides ahead in October

Five million records

Project progress, first half of October

THIS COUNTDOWN CLOCK IS NOW BELOW 100

September progress with SABAP2

Intergovernmental Panel on Climate Change report released

Barberspan conference 28 November – 3 December 2013

Weaver Wednesday [66]: Sao Tome Weaver

Weaver Wednesday [65]: Black-necked Weaver

Sappi TREE TUESDAY, and today we are featuring the Knobbly Creeper

Today is Sappi TREE TUESDAY! The Weeping Sage Buddleja auriculata

Weaver Wednesday: Village Weaver

Public Lecture Wednesday 18 September "The metamorphosis of the butterfly atlas"

2000 up on Facebook

"Citizens who advance science"

This part of South Africa is especially important for annual coverage!

SpringMAP 2013

Weaver Wednesday: Cinnamon Weaver

Bring the trumpets out of the cupboard! Sound the fanfare

Virtual Museum records

Twenty years of CWACing the Bot River Estuary

Atlas bash to Loeriesfontein, Northern Cape, 8-11 August 2013

Save the date: 20-21 July 2013, SABAP2 workshop, Port Elizabeth

Increasing in abundance, but not in range – Dark-capped Bulbul

Dark-capped Bulbul BirdPix 2597 Dave Kennedy

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.

SABAP1 vs SABAP2 range change map Dark-capped Bulbul


link to this new item

www.uct.ac.za
Fatbirder's Top 1000 Birding Websites
Creative Commons License
MyBirdPatch is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
website by michael.brooks
tel. +27 (21) 650 4751 email. michael.brooks[@]uct.ac.za