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Archive for June, 2008

Jun 28 2008

Profile Image of dududiaries
dududiaries

More Gorilla bugs (and gorillas)

Filed under Uncategorized

After meeting the giant earthworms and the flying caterpillar we emerged from the dark, damp tangled bamboo forest into a thick morass of vegetation made up of herbs, wildflowers, high-altitude grasses and most noticeable of all – stinging nettles. Some of the wildflowers in this zone of vegetation are lovely gems. Many are endemic to the area. Below are some pictures of them.

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The nettles were everywhere along the path. Each leaf and stem of the nettles is dotted with sharp glass-like hairs. These are actually tiny hypodermic needles each one connected to a poison gland that pumps out their venom when the sharp end of the ‘needle’ punctures your skin! It burns for hours on end – especially if you accidentally brush against one of the giant stinging nettles with their extra-large needles.

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Despite their formidable armature, the smaller species of nettle are actually edible. They are in fact one of the Mountain Gorilla’s foodplants, alongside some 200 other species of plants that grow on these lush mountains. They can also be cooked as a vegetable and are quite delicious when prepared in milk with a dash of butter – I’ve had them in Western Kenya and Uganda. Clover also grows here - in lush carpets with purple flowers. It provided a nice relief to the spikes and stings on the other plants!

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We continued along the path, which continued to climb, but less steeply than through the bamboo. Progress was steady, punctuated by muttered cries of pain, as every now and then one of us made contact with the stinging nettles. And it was not just the nettles who were out to get us. Some of the other plants were also armed with sharp spiny leaves, such as the Acanthus and thistles which grew into miniature trees up here closer to the sun and watered by abundant rain.

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Not all the plants were on the attack, and I spent a few minutes adoring some of the giant lobelias. These incredible plants are related to common wildflowers that everywhere else grow just a couple of inches tall, but here on East Africa’s high mountains they are magically transformed into floral giants.

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Finally, after a solid two-hour hike through nettles and their friends, we caught up with the trackers who were waiting in the shade of a young rosewood tree. They told us that the gorillas were just ahead, feeding on a flank of the mountain, Bisoke (also called Visoke) that we were on.

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We left our bags and walking sticks behind and followed Francis, our amazing guide, up the slope. Within minutes we saw the bushes moving and saw fuzzy black forms darting in and out of view.

 

My heart was pounding as we got closer and closer. And then, suddenly, we were right there, among them! The first individual I got a good look at was the grand old Silverback (the alpha male gorilla), who leads the family group. Below is the view that we had of him. He continued feeding ignoring us completely. We were stunned and awed by his presence, but I’m not sure that he was even the slightest bit impressed with us! If he did think anything of us, he certainly didn’t show it, only turning his massive head towards us once before returning to peeling nettles.

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Francis beckoned us to follow him, which was easier said than done, as we were on a tangled slope in the thick of nettles. There was no solid ground underfoot either, we walked on a springy mass of vines and nettle-stems, trying to keep our balance and respectful distance from the gorillas (who were not as observant of this rule).

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We stood quietly among the gorillas, watching them feed. Imagine living in a giant field of your favourite foods – that basically sums up the gorilla habitat. Here’s a close-up of the seeding part of the wild celery that they love to eat.

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They move about slowly and gently break off branches and twigs to nibble on. The wild celery is one of their favourites, and they carefully peel its pithy skin off the juicy stems, before munching it. I watched one individual sitting in a patch of wild celery, feeding for several minutes.

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It is so moving to see them feeding and moving about so carefree and peaceful. The fact that these incredible creatures are still on this planet is something that none of us can take for granted. Looking into their eyes I felt more human and more aware that we are but one species on a planet with millions of other wonderful creatures who all deserve to live and thrive, and to whom we are intricately and inextricably linked.

  

How improbably wonderful that we as humans, despite all our blundering and madness, still have our dear cousins, the gorillas, chimpanzees and bonobos here with us in the world today. Somehow, despite all the odds against them, they too have survived and we must do everything that we can to make sure that they, and all the other species too, are here for future generations to marvel at. If you meet a fellow great ape you will realise that without them we would be very lonely, for in them one sees so much of ourselves: compassion, friendship, family, kindness, playfulness, unbridled joy and even curiosity.

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A short time later, parts of the family settled down around their ‘daddy’ the silverback for a short snooze. Again I was struck by the peaceful sense of family and shared group bond that they had. In fact, it makes one wonder which species, ours or theirs, has a more developed sense of family? In their interactions there is little posturing, just pure gentleness and love between the family members. Even the massive silverback tolerated the playful youngsters jumping all over him as he tried to take a nap.

 

This family is known as the Amahoro group, which means ‘peaceful’ as Francis our ranger informed us. They were so named because of all they gorilla groups habituated for human visitation, they were the most calm and peaceful (There was a slight lapse in this when one of the gorillas gently cuffed one of our party, Craig Hatkoff, and the same individual also took a playful swipe at one of the guides).

One of the most intimate moments with these incredible creatures was when watching them snooze under a green umbrella of vines and leaves, Francis grabbed my arm and said: “Look, there is the mother with the young baby!”

 

Moving my gaze from the bright sunshine into the shadows, it took a few seconds for my eyes to adjust. And there before me was one of the most moving scenes of the entire visit. A mother gorilla cradled her young infant in her arms as he nursed at her breast. Her hands were so massive, with callused black palms, but they held the tiny infant with such gentle tenderness. She looked up at me gently as I fumbled with the camera. I felt very much like a voyeur. All the other gorillas did was roll over and grunt as if to say “There they go again, those silly humans clicking away…”

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I sat down nearby and continued to watch them. The baby gorilla soon fell asleep, though he did cough a little bit (you can hear the recording of this and other amazing gorilla sounds on Paula’s outstanding podcast about the trip on the WildlifeDirect Baraza blog).

 

Of course, being a scientist, my feelings of adulation and awe were spiced with curiosity and I kept looking around at the bugs. Yes, even in the presence of gorillas I will look for insects – I am a true insect-lover! It was especially amazing to see the many different kinds of flies that settled on and around the gorillas.

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There were so many different kinds, many of them difficult to get pictures of, but here are some of the species that were closest to the gorillas.

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The commonest flies were ‘Green-bottles’ and their relatives, who settled both on the massive hairy bodies and the fresh dung. Most of these looked like they were in the genus Chrysomya.

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There were also a number of blood-sucking flies, similar to Horse-flies, that are likely to be sucking blood from the gorillas. These flies may not just be pests of the gorillas, they visit flowers in large numbers too and are pollinating some of the plants that the gorillas feed on. There is so much to learn from the other incredible creatures, no matter how tiny, obscure or even ‘gross’, as they too are part of the ecosystem that the gorillas live in. And so, if there’s one lesson from this incredible meeting that I would like to share, it is that we cannot undervalue even a single species with whom we are privileged to share the earth. They all matter. We need them all, and we should love, and care about them all, from giant gorillas to tiny flies.

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One thing I must do is thank all the wonderful people who made this trip possible. First a big Asante to Craig Hatkoff for the kind invitation, and to the rest of the amazing team: Juliana, Ben, Noah, Joe, Bill, Brian; Beth, Eric and Jennifer for being such good organisers, and especially to our great ranger-guide Francis (in the picture below), and all of the people in Rwanda involved in protecting the mountain gorillas, and to Paula (on the left in the second picture below!), for her patience with me stopping to look at insects all the time!

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More soon – currently in Mwanza, Tanzania on the shores of Lake Victoria looking at ant-acacias and other amazing creatures.

PS-Sorry for not posting this sooner. It’s taken me some time to get all the pictures and other stuff sorted. And many thanks to everyone who reads and sends comments. Please forgive me if I don’t respond immediately – I am still learning how to use the blogging software and all the different aspects of the blog that I need to manage.

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Jun 26 2008

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dududiaries

Gorilla bugs

Filed under Uncategorized

The mountain gorillas live on the slopes of some of the steepest volcanoes in Africa. The volcanic range is part of the immense Albertine Rift Valley. This is part of the Rift Valley system that cuts down across the continent of Africa. Due to the volcanic activity and sinking and rising of parts of the continental plate, some of the most diverse and dramatic landscapes have formed as a result.

The flanks of the mountains and volcanoes in East Africa are covered with distinctive bands of vegetation that change as you move higher up the slopes. At lower altitudes there is dense forest, with montane forest where the trees are covered with moss and ferns above this. From the montane forest if you keep climbing you enter a zone of giant bamboo.

The bamboo grows in dense stands with very little else growing in between. The tall, sombre culms rise from a thick leaf litter that is churned into rich mud where hooves have trampled it. Sunlight is filtered by the overarching tapestry of leaves, and the result is a diffuse, cathedral like quality that is mostly silent, save for the occasional creaking or hollow knock when the wind gently stirs some shoots.

The rich, thick leaf litter that forms beneath the bamboo is a perfect home for many different creatures that like damp and dark places. We found one of these as we climbed up the steep path. I heard Paula cry out “Oh – what’s that? It’s disgusting!” Of course, being a good biologist she then picked it up. It was part of a (baby) giant earthworm.

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These are one of several giant earthworms that can be found in the high altitude vegetation of the Albertine Rift. They can grow up to a several feet long, and are more hard and rubbery than their smaller more familiar cousins.

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In some particularly damp places the earthworms even live on trees that have thick layers of moss growing on them! We only found baby earthworms crawling on the surface of the leaf litter. Their much bigger parents were hidden deeper in the thick humus. These worms were also much faster moving than the more common smaller species. They wriggled like snakes using their powerful muscles to twist out of my hands as I tried to photograph them.

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After watching the magnificent earthworms, we walked on and on along the steep path through the bamboo. At one point there the leaves above shook vigorously and some of the bamboo stems waved about. A loud cry “Niiaooow- chuck” echoed from the crashing leaves. This was a Golden Monkey, a species endemic to the area. I only managed a few glimpses of the monkeys as they were extremely shy.

We carried on to the steepest section. Here you had to use all your strength and limbs to keep moving up the path. The mud was slippery and luckily the bamboo made nice handholds. After what seemed like ages we stopped to rest in a small glade.

As I searched for insects on flowers I noticed a flash of light zipping down from the canopy. I moved closer. It dropped again, this time to about eye level. A gentle wind picked rustled through the glade and the creature calmly drifted to and fro. What could this be? Who can levitate so effortlessly?

The breeze died down, and the creature came to rest perfectly still in mid-air! Now I could see that it was suspended by the thinnest of threads. This was a caterpillar absailing down from the canopy. Perhaps it was startled by a hungry bird and using its silken ‘safety rope’ had bungee-jumped off the leaves high above. I guess if you’re about to be eaten it’s worth the risk!

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We had to move on, as there was still a lot of ground to cover before we got to the gorillas…

 

More about meeting the gorillas and the other incredible ‘dudus’ living with them soon!

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Jun 23 2008

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dududiaries

Africa distilled

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I am currently in Rwanda with Paula Kahumbu from WildlifeDirect and Dr Craig Hatkoff, who together with his daughter co-authored a book about Owen and Mzee and more recently, on a baby gorilla. This has been an amazing trip and I don’t even know where to start. One of the main reasons for coming here was to look for new species of insects associated with the mountain gorillas and their precious habitats. This will be a long term project and I’m hoping to just help out right now with developing the preliminary butterfly checklist. The pictures in this post show the volcanoes of the Volcanoes National Park and some typical views of the countryside.

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Rwanda is an amazing, beautiful, green and peaceful country. The country is currently making huge strides in development, stability and a safe and secure place for investment and development. It is so different from the drylands of Kenya. The landscape is made up almost entirely of rolling hills that tumble down to beautiful lakes, with the spectacular Virunga volcanic range on the border with the Democratic Republic of the Congo and Ugand in the northwest, and the vast, muggy Akagara swamp-savannah in the East towards the border with Tanzania.

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The Virunga volcano chain is one of Africa’s most spectacular massifs. They rise from the hilly plain high up into the sky, strewn with mist and cloud more than half the time. Their forested flanks are home to the incredible mountain gorillas, who along with the chimpanzee and bonobo are humankind’s closest surviving relatives on the planet. When the clouds shift, the steep volcanic cones are briefly visible, their mottled flanks farmed up to the very edge of the Parc des Volcans (Volcanoes National Park). This truly is ‘Africa distilled’ as the author Isak Dinesen summed up the equatorial highlands of Africa. It is bright and sunny, yet never hot, and crisply cool at night – just the most perfect weather in my opinion!

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From the little that I’ve seen of the countryside so far, what’s most impressive is the intensity and diversity of the cultivation. As a landlocked country in the heart of Central Africa with a population of over 9 million people, Rwanda needs to work very hard to feed its people. Basically every square inch of land that can be cultivated is. And the farms are incredible, perched on terraced slopes and carved out of rock and floodplains.

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So many different crops are grown in gorgeous mosaic of intensive cultivation. Beans, maize, rice, potatoes, cassava, wheat, tree tomatoes, passion fruits, papaya, mangoes… the list is endless. The combination of equatorial sunshine, fertile volcanic loam soils and industrious people make for an incredibly productive agrarian system, allowing both tropical and temperate crops to be cultivated side by side. (Both Paula and I have been gorging on the fruit, especially the extra-yummy tree tomato juice!).

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There’s lots and lots to write about, especially the wonderful insects and plants and of course the gorillas – more on that soon! So look out for my next post will highlight the amazing insects of this unique volcanic part of Africa

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Jun 05 2008

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dududiaries

A colourful freeloader

Filed under Ants

I’ve been spending a lot of time looking at the ant-acacias that I study for my PhD. The other day I cam across the most intriguing insect living among the ants on one of the acacias. There are several different ant species involved in a mutualism with the plant. The acacia provides housing and food (through sugary nectar secreted from special glands), and the ants provide patrolling protection against hungry mouths and mandibles that might chance to nibble on the plants.

One particular ant is very aggressive and  an extremely good partner for the plant. This is a cocktail ant (Crematogaster mimosae) who provides regular patrolling and rushes to defend the plant when it is disturbed.

However, no arrangement is perfect and every relationship is subject to infiltration in nature. Many different creatures exploit the ant-plant mutualism for their own selfish ends. I found one of these remarkable creatures the other morning. While watching the ants tending scale insects on the young shoots of an acacia I noticed a bright green form moving among them. At first I thought I was seeing things - perhaps the result of spending too much time in the sun?

A closer look revealed that they little green person was indeed an alien intruder in the form of a beetle. This beetle lives among the ants as a total freeloader. It cons them through a mixture of tactile and no doubt chemical communication into thinking that it is one of them. It even taps them on the head in the right way and the hapless ants regurgitate food for it!

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Jun 02 2008

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dududiaries

Orchid mystery

Filed under Pollination

Hello

I am currently in Western Kenya looking at one of the sites that I do some research in and exploring forests. Yesterday I went on walk in the Kaptagat Forest. This is a highland forest with a mixture of indigenous forest and commercial plantations. It had rained the previous night and the ground was wet and slippery so we made very slow progress through the forest. There were lots of orchids on the trees and some of them were flowering.

One tiny orchid, a Polystachya, had fascinating flowers. They hang like miniature xmas decorations from a tangled branch. Despite their tiny size (less than 1cm across) they exude the most enticing perfume. A mixture of lemon and marzipan that slightly tickles when you lean in close for a deeper whiff.

The orchid’s flowers are unusual too in that the reproductive parts have been rotated 180 degrees. Therefore, the potential pollinator will have the orchid’s pollen deposited on its belly! Orchid pollen is not fine and powdery but packaged into solid bundles called pollinaria that attach to the pollinator with a special glue! I hope to solve the mystery of this flower soon - for who could be its pollinator?

As my camera was back at home charging, I decided to sketch the plant…

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