Forest mammalian community dynamics and human wildlife interactions in the Southern Mistbelt Forests of KwaZulu-Natal and Eastern Cape, South Africa.
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Date
2021
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Abstract
African and Asian forests are well known for their high faunal and floral diversity; however, many
forests have been left degraded or cleared because of anthropogenic activities from the past and
present. In particular, African forests have been heavily exploited for their timber resources and
land conversion for anthropogenic activities such as agriculture,. South African forests,
specifically the Southern Mistbelt Forests, have been subjected to heavy logging by colonial
settlers and subsistence harvesting in recent times because of the logging of trees such as
yellowwood species (Podocarpus and Afrocarpus spp.) and hunting of bushmeat species blue
duiker (Philantomba monticola). The aim of the study was to assess the anthropogenic impacts on
mammals occurring in the Southern Mistbelt forests of KwaZulu-Natal and Eastern Cape
provinces, as well as other uses of the forest and human-wildlife interactions.
Study areas included the disjunct Southern Mistbelt Forests of the northern Eastern Cape
and southern KwaZulu-Natal provinces, South Africa. It was conducted in three different forest
cluster areas: uMthatha, Glengarry/Weza [termed iNgeli hereafter] and Creighton with forest
patches of varying size. We conducted camera-trap surveys between May 2018 – February 2019
during the wet (summer/spring) and dry (winter/autumn) seasons, resulting in one full 21-day
survey for each camera-trap location per season. We used infrared motion detection camera-traps
to monitor mammalian forest species at set camera-trap locations determined using a 400 m x 400
m systematic grid system overlaid onto Southern Mistbelt Forest patches in Arc GIS v10.5.1. We
also conducted semi-structured interviews in all three areas from October to November 2019.
When assessing microhabitat use by mammalian species, we found that mammalian
species most often photographed during sampling seasons were bushbuck (Tragelaphus scriptus) and samango monkey (Cercopithecus albogularis labiatus), with the least photographed species
being serval (Leptailurus serval) and African wild cat (Felis silvestris cafra). Land-use data around
each forest patch were extracted, with settlements, exotic timber plantations and grasslands
identified as the dominant adjacent land-uses. The importance of exotic tree plantations
surrounding indigenous forest patches to the persistence of mammalian species was highlighted.
The maturity and condition of exotic timber plantations surrounding forest patches in our study
also varied and may have influenced the area's use and suitability by mammalian species.
Creighton was the only study area where human settlements were a dominant land-use around
patches. The samango monkey had the second highest mean occupancy across all sampling areas
and land-use types. Forest mammals make considerable contributions to the functioning of forest
ecosystems.
We evaluated the response of forest mammal functional diversity and species richness to
factors such as patch size. Species β-diversity was greatly driven by turnover and functional β-
diversity was driven by nestedness; therefore, management implications of these forests and
associated mammalian communities suggest that all patches should be considered a priority for
conservation. Due to different management implications, if nestedness is dominant, forest patches
that have a higher diversity of species traits and species richness should be prioritised for
conservation.
Lastly, we aimed to quantify and assess the dynamics of forest use and hunting of
mammalian species in communities close to forest patches and found that ungulates are the
preferred choice for consumption in lower-income settlements which is supported by many other
studies. Different species were hunted for various reasons such as: consumption, monetary gain
(bushmeat trade and selling of hides) as well as retaliatory killing of predators hunting livestock. However, respondents shared that the forests are important to them and to protect them guards
would be a good choice as well as education and awareness about sustainable use. There is a
paucity of information about the overall mammal community inhabiting these forests and this
study has highlighted which species inhabit these forests as well as their forest utilisation and how
anthropogenic activities affect species populations. Furthermore, it highlighted that communities
close to these forests see these forests as areas of high conservation importance.
Description
Doctoral Degree. University of KwaZulu-Natal, Pietermaritzburg.