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Lake Kivu pressure, Nyungwe lichen feeding and Akagera rhino arrivals
A 2018 campaign measured gas pressure deep in Lake Kivu. A Nyungwe study followed one colobus group’s feeding when preferred foods ran short. Akagera’s dated accounts describe rhino moves in 2017 and 2019.
At a glance
A place worth remembering
Lake Kivu: pressure measured at depth
The 2019 study compares measured total dissolved-gas pressure with the level at which bubbles would form spontaneously in deep water. In its March 2018 campaign, the reading at about 350 m was approximately 17 bar, which the authors estimate at roughly half of the absolute pressure at that depth. They say gas pressure would need to double for bubbles to form spontaneously.[1]
Nyungwe: lichen as a fallback food
Over 13 months, researchers identified 19 preferred food items for a Nyungwe group of Colobus angolensis ruwenzorii. In months when these foods were less available, Usnea lichens contributed more than half of the group’s monthly diet. The authors classify this as fallback feeding; it is a finding about the observed group, not a park-wide diet.[2]
Akagera: two dated rhino moves
By African Parks’ account, an eastern black rhino was last confirmed in Akagera in 2007, before the species returned. The joint release hosted by Safari Park Dvůr Králové and dated 24 June 2019 says 18 rhinos were brought from South Africa in 2017, and that five more eastern black rhinos had arrived from European zoos and entered enclosures for acclimation. At the time, a move to a protected area within the park and eventual release into the wider park were still described as plans.[3][4]
Good to know
A few clear answers before you explore.
Why does the Lake Kivu study compare gas and absolute pressure?
The comparison shows how close the water is to spontaneous bubbling. In the March 2018 measurements, gas pressure at about 350 m was roughly half of the absolute pressure; the authors say it would need to double for bubbles to form spontaneously.[1]
What does “fallback food” mean in the Nyungwe study?
The authors use the term for a food whose consumption rises as preferred foods become less available. For the group they followed, Usnea lichens filled that role.[2]
What was planned after the five rhinos arrived in 2019?
The dated release said they would first acclimate in enclosures, then move to a protected area within the park before a later release into the wider park. Those steps were described as future plans in June 2019.[4]
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