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The Wildlife of the Rwenzoris (Fishy Ugandan Tales: Episode 9)

Rwenzoris, Uganda
Rwenzoris, Uganda

Hidden on the western side of Uganda lies an unexpected surprise. Home to the third highest summit in Africa (Mount Stanley), a number of diverse ecosystems, and interesting wildlife, the Rwenzoris are a fascinating mountain range.  Although I am here in Uganda studying mercury contamination in fish, a number of other species of this area also spark my interest. Curious about the plants and animals of the Rwenzoris, some of which are endemic to these mountains, I set out to hike the central circuit that traverses the Ugandan portion of them.  These are some of the most interesting species I encountered…

 

Female Three-Horned Chameleon
Female Three-Horned Chameleon

 

Male Three-Horned Chameleon
Male Three-Horned Chameleon

The three-honed chameleon, also known as Johnston’s chameleon, is an east-African species, endemic to Uganda, Rwanda and the DRC, that can be found in abundant numbers at high elevations (3000m plus). Males and females can easily be differentiated by the presence or absence of this chameleon’s three characteristic horns.

As with most chameleons, this species is capable of changing their coloration. Camouflage is one of the known factors which regulates chameleons coloration. Here in the Rwenzoris, I saw a number of chameleons. With no exceptions, when they were in the foliage they were green and when they were on the ground, they were brownish.  Interestingly, camouflage is not the only factor that drives chameleon coloration.  Temperature has been shown to influence color in a number of species. Intentions also seem to be an important driver of color.  What exactly can “intentions” mean in this context?  Well, if a chameleon is courting another individual, or defending themselves, their color is likely to be affected by the activity at hand. So an individuals’ intention toward another can affect coloration.

Kinyongia xenorhina (Rwenzori plate-horned chameleon) on the ground
Kinyongia xenorhina (Rwenzori plate-horned chameleon) on the ground

Now although I originally thought that this brown colored chameleon was also a three-horned chameleon, some readers have suggested that it is actually a female Kinyongia xernorhina, also known as the Rwenzori plate-horned chameleon, or the strange-nosed chameleon.  A quick search on scientific journal databases has shown me that very little research has been done on the chameleons of the Rwenzoris. Perhaps sometime in the future more documentation will be readily available for people to be able to easily tell the differences and particularities of the different chameleons present in the Rwenzoris.

 

Lobelia deckenii; on route while heading towards the summit of the Rwenzoris
Lobelia deckenii; on route while heading towards the summit of the Rwenzoris

Lobelia deckenii is a plant that grows in moist valleys of East-Africa.  Being Canadian, the only other lobelias I had seen in my life are all very small, so when I saw one of these plants for the first time I understood why they are commonly known as ‘giant lobelia’. This plant can span over a meter in height and is known for the water reservoirs it carries in its rosettes.  When temperature drops below zero, these reservoirs freeze, protecting the apical meristem of the plant.  Without this reservoir the plant itself freezes, causing damage.

Comments

  1. Christopher V. Anderson
    Providence, RI
    September 18, 2013, 11:50 am

    The three-horned chameleon species found in the Rwenzoris is not the Jackson’s Chameleon (Trioceros jacksonii; a viviparous species endemic to Kenya and Tanzania) but rather the Johnston’s Chameleon (Trioceros johnstoni; an oviparous species endemic to Uganda, Rwanda, Burundi and the DRC). Further, the third “three-horned chameleon” photo in this article is not T. johnstoni, but rather a female Kinyongia xenorhina (Rwenzori Plate-horned Chameleon).

    • dalalhanna
      September 18, 2013, 1:53 pm

      Thank you for the feedback Christopher. I’m made some adjustments in the article to correct the information. I had had trouble finding information on the chameleons of the Rwenzoris but was really pleased to see that you probably knew a great deal about them when I visited your webpage!

  2. Makko
    Entebbe
    August 29, 2013, 12:19 am

    Beautiful article and photos. I feel like visiting the Rwenzoris