Daytime aardvark sightings are a sign of troubled times
Wits researchers find that aardvarks feeding in the daytime during
droughts might be starving

Date:
July 9, 2020
Source:
University of the Witwatersrand
Summary:
New research reveals what a shift from night-time to daytime
activity means for the well-being of aardvarks in a warming and
drying world.



FULL STORY ========================================================================== Aardvarks occur across most of sub-Saharan Africa, but very few people
have seen one, because they are solitary, mostly active at night,
and live in burrows. They use their spade-like claws to build these
burrows and to dig up ants and termites on which they feed. However,
seeing aardvarks feeding in the day is becoming more common in the
drier parts of southern Africa. While catching sight of an aardvark is
a delight for many a wildlife enthusiast, researchers from the Wildlife Conservation Physiology laboratory at the University of the Witwatersrand (Wits) warn that seeing aardvarks in the daytime does not bode well for
this secretive animal.


==========================================================================
New research by the team from Wits, with collaborators from the University
of Cape Town and University of Pretoria, reveals what a shift from
night-time to daytime activity means for the well-being of aardvarks in
a warming and drying world. The researchers studied aardvarks living at
Tswalu, a reserve in the Kalahari that lies at the edge of the aardvark's distribution and provides support and infrastructure for researchers
through the Tswalu Foundation. The results are published in the journal Frontiers in Physiology.

Using biologgers, the researchers recorded body temperature and activity
of aardvarks for three years, during which Dr Nora Weyer followed the
aardvarks as part of her PhD research.

Assisted by satellite imaging that showed her how droughts affected the vegetation, Weyer was able to connect changes in aardvark behaviour and
body temperature to what was happening in the aardvarks' environment.

Weyer's research confirmed earlier findings by the team that there are
times when the aardvarks switched their feeding to the day, and showed,
for the first time, that drought caused that switch. "We suspected that it
was drought," says co-worker Dr Robyn Hetem, "but we needed a long-term, comprehensive data set to confirm that it really was drought causing
this unusual behaviour." The Kalahari is arid at the best of times, but drought killed the vegetation that fed the ants and termites. Most of
the ants and termites disappeared, leaving the aardvarks starving. "It
was heart-breaking to watch our aardvarks waste away as they starved,"
says Weyer.

By shifting their activity from the cold nights to the warm days during
dry winter months, aardvarks can save some of the energy needed to keep
their body temperatures up. But those energy savings were not enough
to see the aardvarks through a particularly bad drought in which many
aardvarks died.

"Aardvarks have coped with the Kalahari's harsh environment in the
past, but it is getting hotter and drier, and the current and future
changes to our climate might be too much for the aardvarks to bear," says Weyer. "Because the Kalahari is such a unique and potentially vulnerable ecosystem, we need to better understand whether its animals can cope with
the increasingly dry conditions," says Professor Andrea Fuller, co-worker
and project leader of the Kalahari Endangered Ecosystem Project (KEEP).

Disappearance of aardvarks from the Kalahari would be devastating for
many other animals in this ecosystem. The large burrows which aardvarks
build provide important shelters for many other species that cannot dig
their own burrows, earning the aardvark the title of ?ecosystem engineer'.

"Unfortunately, the future looks grim for Kalahari aardvarks and the
animals that use their burrows. Tackling climate change is key, but there
is no quick fix," says Weyer. What conservationists do know is that any solution will require a much better understanding of what capacities
animals have to cope with drought. And that means many more long-term comprehensive studies of physiology and behaviour, like the study that
Dr Weyer and her colleagues carried out at Tswalu.


========================================================================== Story Source: Materials provided by University_of_the_Witwatersrand. Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Nora Marie Weyer, Andrea Fuller, Anna Jean Haw, Leith Carl Rodney
Meyer,
Duncan Mitchell, Mike Picker, Benjamin Rey, Robyn Sheila
Hetem. Increased Diurnal Activity Is Indicative of Energy Deficit
in a Nocturnal Mammal, the Aardvark. Frontiers in Physiology,
2020; 11 DOI: 10.3389/ fphys.2020.00637 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/07/200709092459.htm

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