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Beetle blog

2 Posts tagged with the mahenge_ tag

Tanzania Expedition Part 3: Magombera Forest and Mahenge Mountains



Having put up with the cold of the peak at Mwanihana in the Udzungwas, we found respite in the warmer, more humid conditions of Magombera Forest. Magombera is a small remaining fragment of a once larger forest that linked the Udzungwas and the Selous. The interior is still in good shape but the forest composition here is very strange – there is very little mid-storey and hence one gets excellent views into the canopy. This is one of the reasons for the excellent sightings of some rare and endemic monkeys. There are three species in this forest – Iringa Red Colobus, Black and White Colobus and Sykes Monkey. You have got to be pretty unlucky if you do not see all of these on a two hour walk. We even managed to see them in the pouring rain!


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The Magombera railway line


With the exception of some of the more common species of butterflies, there was nothing spectacular in terms of insects. The dung baited traps worked relatively well, but compared to the diversity of dung beetles in Udzungwa, it was a little disappointing. From Magombera, our aim was to head to the Kilombero swamps and up to Mahenge. This part of Tanzania is extremely remote and the roads are truly appalling. You do see some extraordinary vehicles stuck in the mud and inevitably a long queue behind and in front of it. We made it down to the ferry crossing across the Kilombero river and realised that it would be nigh on impossible to undertake any work here; the river water was high and there was a very immediate danger of crocodile and hippopotamus. So an executive decision was made to go straight up to the high forests of the Mahenge Mountains. We passed a night in a lay-by on the road that runs through the Mahenge Scarp Forest (no hotels in this part of the world!). The light trap here was rather fruitful.


From here, another long and arduous drive up further into the mountains along what can loosely be described as a road to the village of Sali. I am getting use to finding amazing villages at the end of these long mountain roads but Sali really is astonishing and especially the architecture. It feels like you are in rural Europe; the German missionaries built a number of buildings including the church in the early 1900s and everything has been looked after incredibly well. The church has proper roof tiles (which according to the pastor was sent over from Germany), a bell tower (the bells are rung every morning), and arches over all the windows. Inside, all the furniture has been built using the local hardwoods; there is even a pipe organ! It really is amazing to think that everything is original and despite the rain and the humidity, in incredibly good shape. This village is remote. People were amazed to see that we had made it up here. We were told that the last vehicle which successfully entered the village was in January! IMGA0358church at sali.JPG
























The Church at Sali


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The interior of the church at Sali


The forest at Sali, though small, is very good. There are good numbers of enormous mahogany trees still standing which is an excellent sign. The slopes here are (once again) very steep and this has stopped the logging of these trees. I have been told that one of these great trees would cost upward of 5,000,000 Tanzanian Shillings (£2000), which is quite a considerable sum. The walk in is beautiful with many waterfalls along the river. There is one big one I would like to name. I wonder if I am allowed to name it... The locals have however decided to name base camp after yours truly – I expect all future researchers to reference the camp by this name in their work!


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The mahogany tree


There were fewer mosquitoes up here but they have been replaced by ants. Lots of them. For the duration of our time at camp, we had army ants. Along our transects, ants. Everywhere. They are a serious irritation. All our camp kit was closed and zipped up; all important goods (chocolate) suspended high up off the ground! The snails and slugs were pretty bad too. There have been some big ones – the size of your hand! If you put something down on the floor for more than 10 minutes, there would be either a slug or snail or both stuck to it. Absolutely vile... Flicking slugs off my tent has now become a morning routine.


There have been very few crosses in the personal injuries column up until now but here at Mahenge, a big cross has been inked in – I managed to stab myself with the oxalic acid syringe. Twice. On the same night. The weather has also been behaving. A more reasonable cycle of relatively warm and dry daytimes followed by heavy downpours throughout the night. None of this raining 20 hours a day that I had in Udzungwa!



Apart from the wonderful views and excellent forests that the Eastern Arc Mountains of Tanzania have to offer, there is one more gem to be found here – the tiny pygmy chameleons. I have seen them at all the different mountains I have visited but the one found here is a particularly beautiful species. It is also one of the “larger” pygmy chameleons! 



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Pygmy chameleon of the genus Rhampholeon; star of the blog thus far! (BG)




On the beetle front, the dung baited traps have worked exceptionally well and there were many species which I have not seen in any of the other mountains. Carabids have been most numerous in these forests, found scuttling on the forest floor whilst walking around at night with a torch. Some interesting beetles have been appearing at the light sheet but again it has been quiet and the potential of the Mercury Vapour lamp has not been fully realised. I am hoping for better in the future. Unfortunately the bulb we had used up until now is no more - we awoke on the final morning to find it completely smashed. The cause? We have no idea.

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And to the 'dullest' photo of the blog thus far! Mysterious broken lightbulb; was it a bat, was it a giant moth; perhaps we shall never know...!(BG)


Up next – the Uluguru Mountains.



Happy Easter beetlers!



So whilst all you good people are out enjoying the glorious weather, I am inside dutifully blogging away for your continued enjoyment. Here is the latest installment from our intrepid HT, who it would appear remains alive, despite close encounters with Elephants and large flying beetles...And, also, it would appear retains that healthy enthusiasm for on...


"The Winter’s Tale it may be – it really does get cold in these mountains. When one thinks of Tanzania, images of large mammals in the warm African Sun come to mind. The mountains could not be more different. I am currently camped at just under 2000m on a stupendous slope for a tent to be erected! If it rains during the daylight hours, the evenings are very cold.

Udzungwa is an incredible area of biodiversity and endemism. And to the Tanzanian authority’s great credit, they have protected it very well. There are still vast tracts of primary forest standing with excellent populations of mountain elephants and other endangered species. The Udzungwas have also thrown up some quite extraordinary new species to science in the very recent past – the Kipunji (a new species of monkey), and an elephant shrew to name but two.


Beautiful view over the Udzungwa mountains from Mwanihana peak

I am studying the Mwanihana region of the Udzungwas, an area with many different habitats leading up to the heather-covered granite peak at just over 2100m. The views from up here are amazing; the mountains and its highest peak, Lohomero, in one direction and the plains of the Kilombero and Selous in the other. I’m getting used to ridiculous slopes to clamber up but the final push through the submontane forest to reach this peak is unbelievable. It is quite difficult to portray how steep it really is in a photo!

The noises in the forest at night can be frightening. Having seen the havoc created by elephants on many of the paths in the forest, I would not want to encounter them, or for them to encounter us in the middle of the night! A ranger, armed with a rifle, from the National Parks team is a necessity and will warn me as soon as any danger is imminent. There was one night when the elephants were pretty close to camp – they could be heard ripping plants and trees out of the ground...



...but it was not the elephants that I had the closest run in with. Whilst camping nearer the peak, a buffalo came rather close. We camped on the flattest bit in the area (I say flat, but it is all relative; nothing is flat up there), which happens to be by the path. This path is used not just by humans but animals too – they don’t want to work any harder by creating new paths if they can use ones which are already present. Luckily for us, the buffalo was not so sure about something, perhaps the light and fire in camp but probably the smell exuding from the synthetics such as our tent fabric (and from me as well) and left us in peace. But hearing the rustling whilst stuck in a tent is very disconcerting!



It has nearly been a month since arriving in Tanzania and it is reaching a point where I start craving certain foods – mainly cheese and sushi. Conversely, I have now reached a point where finding a cockroach cooked in with your rice for dinner does not bother me; if it was fried as opposed to boiled, I would probably eat it. Irritations still include mosquitoes, drying clothes by the fire on a nightly basis and putting wet clothes on in the morning because a) you did not manage to dry your clothes by the fire or b) because the tarpaulin over the clothes line where your dry clothes are hanging decides to leak heavily. You can never win (NB: it seems one only finds out about holes in tarpaulins when it rains, at which point it is too late...).

A friend of mine commented from the last blog that he had an image of me “sinking African beers waiting for the odd beetle to fall into a cup listening to the cricket commentary.” If only collecting beetles was that easy and could be done whilst listening to the cricket...I can but dream! The reality is a lot of hard work, trekking and in the Udzungwas, digging....




Dung baited pitfall traps (See what I mean about the poo!? BG)


Digging for what you may ask? Beetles of course.


The presence of elephants in these mountains means the existence of one of the largest dung beetles in the world. The beetles belonging to the genus Heliocopris are powerful, charismatic (if that can be used as a descriptive term for a dung beetle) bulldozers, that bury deep into the ground underneath the dung pat. It is a real challenge to find them and it involves careful digging up to 3ft underground! And they certainly don’t make it easy... they avoid the big roots in the ground so their tunnels go left and right and it is rather too easy to lose the trail. They leave a trail of the elephant dung all the way to the end of the tunnel where they create a chamber and fill it with dung. The photo shows just how big the ball of dung in the chamber is!



Many other species of dung beetle feast on the massive banquet that is elephant dung and those species that bury the dung can be found at different depths in the ground. Some of the smaller dung beetles cheat and follow the giant tunnels of the Heliocopris and are often found a long way underground; there is no possible way that they could have got there on their own accord! Digging for beetles is a time consuming approach and so trapping for these beetles using dung baited pitfall traps makes the job a lot easier. It can be very successful depending on where they are placed and the meteorological conditions that day.


A male Heliocopris hamadryas (sexual dimorphism makes these beetles relatively easy to tell males from females, BG)


I have not found many Cetoniids in the Udzungwas this time. To be honest, there have not been that many insects around and certainly far less than I was expecting. Even the light traps have been rather quiet. I think that it is just too wet for them too! However, from time to time, some pretty impressive sized long horn beetles (Cerambycidae) such as the Tithoes below and click beetles (Elaterididae) have turned up to the light sheet.



Catch of the trip so far: a Cerambycid flew past me and landed on the top of a 5m tree. Having seen it through a pair of binoculars, it had to be caught! Much activity ensued to secure a 3m extension (a tree sapling was all we had to hand) to the butterfly net. It ended up with me on the shoulders of one of the field assistants trying to keep this net straight. One swing of the net later and we had the beetle in the net. A lot of effort for one beetle – but what a beauty it is!



Hilarious! I hope you have filled out a risk assessment for this most unorthodox fieldwork method HT?! Also, note right foreground: an Englishman is never separated from his umbrella in the tropics! BG




Next on the itinerary is Magombera forest, a tiny fragment of good lowland forest with large populations of monkeys, the Kilombero Swamp (guessing that this will be a bad idea in the wet season – mosquitoes will be everywhere?!) and Mahenge Scarp, the last mountain in the Eastern Arc chain."



So folks, you will have to wait until next time to find out the identity of the Cerambycid which was so hard won (yes, I'm attempting to build suspense!) - truth is, I'm off to catch some beetles of my own before the sun goes down on this glorious day...BG



Member since: Sep 15, 2009

I'm Beulah Garner, one of the curators of Coleoptera in the Entomology department. The Museum's collection of beetles is housed in 22,000 drawers, holding approximately 9,000,000 specimens. This little collection keeps us quite busy!

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