And so it came to an end. No official date or ceremony, but
more a progression. I was missing Anja and Elena a lot, especially since the
week after Easter I had had no communication with home at all. Once Chris had
picked me up, the speed of the survey undertaken by vehicle made sense to keep
it going that way.
Over 2500km had been covered by bicycle, along with many
tens of kilometres of hiking where no vehicle could go. Since the vehicle was
on hand and needed to go home anyway, Chris decided to prolong his
participation on the project as co-driver as we worked our way down the Western
part of the Cederberg, The Groot Winterhoek Wilderness Area, before wrapping it
all up with a traverse across the Hottentots Holland from Stellenbosch to
Nuwerust. This transect, 16km long, was the quietest of any I have done so far,
a combination of young fynbos and a stiff south-easterly wind that was gusting
at 60km/h as I crested the pass between the Jonkershoek Nature Reserve and
Hottentots Holland.
It seems like a long time since those moments of trepidation
and nervousness when I headed out on the bicycle from home for the first time,
everything I needed on the trailer behind me. Now it is time to reflect on
highlights and lessons learnt. The obvious lowlight was the theft of the
bicycle in Cape Town and disruption of the planned family time there. Hard
parts were the long periods alone, thinking of family and friends, especially
when the weather was bitterly cold or wet. I also remember the sadness I felt
looking across from the Swartberg to the Kammanassie and watching clouds of
smoke rising from where I had been only a few days before, knowing that the
beautiful mature fynbos and all its birds were no more.
But on the whole, highlights dominated these three months on
the road. The kindness and support of strangers in remote parts of the country;
breath-taking scenery: sunsets on the Swartberg, the colourful kloofs of the
Kammanassie, rugged gorges of the
Rooiberg, sandstone statues of the Cederberg; the silence of the dusty
back-roads of the Karoo and the din of a hundred Cape Sugarbirds and
Orange-breasted Sunbirds feeding on the Proteas of Boosmansbos and Sleeping
Beauty. I remember the excitement associated with each Cape Rockjumper and
Protea Seedeater encounter. There were many moments of satisfaction after a
long days ride, thrills on the downhill sections of the passes and the pleasure
of a cool breeze during long uphill rides. There was a moment of great relief
as I summited Seweweekspoortberg – the realisation that I can still do this,
that I’m not old yet ;)
I probably also started the survey with some preconceptions,
arrived at mostly due my Fynbos experience limited to my backyard in
Baviaanskloof; and to an initial analysis I did to compare the six Fynbos
endemic bird species with six ecologically and morphologically similar species
that occurred over a wider area using SABAP (Southern African Bird Atlas Project)
data. Range maps at the quarter degree grid cell level (blocks of about
23x27km) suggested that Cape Sugarbirds, while reported less, are still
widespread. I now see that their distribution is so closely tied to a subset of
Proteas that their fate is intricately tied up with the fate of Proteas. And
unfortunately with increasing fire frequency, the future of Proteas does not
look rosy: coming across mature stands of Protea veld – burnt over 10 years ago
– was not a common occurrence.
While I was initially a bit more worried about
Orange-breasted Sunbirds, these colourful and cheerful fellows of the fynbos
are not so tied to one type of Fynbos. While they were without a doubt common
with any fynbos featuring Erica species with long, red flowers, they were also
very common in certain types of Protea veld. I also recorded them in areas with
large numbers of pine trees, albeit in lowernumbers.
I didn’t have many preconceptions about Cape Siskins – I
simply knew too little - but these are common in almost any rocky fynbos, and
persist in fynbos types that have been burnt up to four years ago and are
dominated by restios. Their future seems secure for the time being, as their
occasional forays into Karoo habitats suggest they are not as restricted by
aridity gradients as perhaps some of the other species are.
Victorin’s Warbler is very common in the southern mountain
ranges – Langeberg and Outeniquas and rare in the drier sections of the
Cederberg and Swartberg. As such, they like moist and rank fynbos and will
probably decline under drier climatic conditions.
Cape Rockjumper I was initially very worried about as they
showed an apparent contracted and fragmented range between SABAP surveys. I
think I now understand what drives their occurrence – a combination of
topographical and moisture gradients. They are found mainly on scree slopes at
the base of eroding rock fronts e.g. cliffs, and probably at a rainfall level
higher than 600 to 800mm, as this would explain why over most of the mountain
ranges they are only found above 1000m except in the Kogelberg Mountains. On
the other end of the spectrum, too much rain eg southern slopes of the
Langeberg and the vegetation is too rank for their foraging habits. I suspect
there is an element of their dietary habits which is not understood with may
restrict their range. This may, for instance have to do with the need for the
proximity of productive Protea or other mature Fynbos types that is conducive
to insect life.
As for Protea Seedeaters, they are as much of a mystery to
me now as when I started. With the exception of the Cederberg and Fynbos
elements of the Baviaanskloof, encounters were infrequent, and no pattern of
occurrence is apparent to me yet. I observed Protea Seedeater at a stream in
the very hot and arid Die Hell valley, on the wet Prince Alfred’s pass in
mature Protea veld, foraging on Kiggeleria seeds in Meiringspoort but also on
Protea seeds in the Skurweberge, and sightings came from a range of elevation
gradients.
I now have the task of entering into my laptop the scores of
sheets of data I have taken in the field, and more concrete insights should
emerge over the course of the next few months.
There will of course be winter survey – which like most
sequels will not see much development in the plot, but should feature more
action, new locations, but hopefully no special effects. As sponsorship
recently has been thin on the ground, any assistance that can be offered will
be most gratefully accepted. Tax deductible sponsorship can still be
contributed via Birdlife South Africa – South Africa’s leading bird conservation
charity organisation. Details are reproduced here from their website (http://www.birdlife.org.za/support-us/donate):
Account name: BirdLife South Africa
Physical address: 239 Barkston Drive, Blairgowrie 2194,
Gauteng, South Arica
Account number: 620 675 062 81
Branch: First National Bank, Randburg
Branch code: 254 005
Swift code: FIRNZAJJ768
Reference: Your initials and surname followed by
"Donation Fynbos”
Taking a bow: Thanks for your support and attention! |
http://www.soenyun.com/Blog/2012/04/22/into-the-tunnels/
ReplyDeleteHere I read about
'old-growth chaparral, an environment so old and established that you can’t tell its age, meaning this area hasn’t burned intensely in many decades or even centuries. In old-growth chaparral you’ll find plants of all ages and stages of life, not just a uniform cohort of seedlings starting over after a fire. Seeing how rich this area is, you can begin to understand how big a lie it is when people insist that fire is essential to maintaining the health environments like this'.
Left me wondering about old-growth fynbos. You have answered some questions, but asked MANY more for me.
Well done on finishing well... its a great achievement and I hope you will be derive great results from your hard work. Are you going to be using your data for any "official" report / article? Perhaps you can contribute it to the OO (Ornithological Observations), if not?
ReplyDeleteLooking forward, as always, to reading more of your adventures in the future.