Tall trees survival in relation to bottom-up and top-down drivers in Hluhluwe-iMfolozi Park, South Africa
Tall trees are in decline throughout many national parks in South Africa. Many studies have found that trees within a certain size are preferred by elephants which damage trees by either bark stripping, breaking tree branches and/or stems or by knocking over trees (toppling). The decline of trees...
| Main Author: | |
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| Format: | Second cycle, A2E |
| Language: | Inglés Inglés |
| Published: |
2017
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| Subjects: | |
| Online Access: | https://stud.epsilon.slu.se/10327/ |
| _version_ | 1855571672437882880 |
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| author | Madsen, Petter |
| author_browse | Madsen, Petter |
| author_facet | Madsen, Petter |
| author_sort | Madsen, Petter |
| collection | Epsilon Archive for Student Projects |
| description | Tall trees are in decline throughout many national parks in South Africa. Many studies have
found that trees within a certain size are preferred by elephants which damage trees by either
bark stripping, breaking tree branches and/or stems or by knocking over trees (toppling). The
decline of trees in relation to growing elephant populations is of growing concern, as tall trees
are a key stone feature in the savanna ecosystem. One of the parks where elephant populations
are increasing is in Hluwhluwe-iMfolozi Park, KwaZulu-Natal. To investigate whether trees
within the park are in decline, we set out to revisit previously tagged trees from 2007 to
reassess their condition. When revisiting trees a total of 260 trees were found, resulting in a
92.5% success rate in relocation of individual trees. The analyses showed that elephant impact
was not descriptive of tree mortality within the park. Two tree species however, Combretum
molle and Spirostachys africana, had a lower mortality risk. The risk of elephant impact was
mediated by several abiotic variables, such as slope, aspect and elevation. The results of this
study further accentuates the need to research the interaction between various factors to
understand the causative agents of tall tree mortality. |
| format | Second cycle, A2E |
| id | RepoSLU10327 |
| institution | Swedish University of Agricultural Sciences |
| language | Inglés Inglés |
| publishDate | 2017 |
| publishDateSort | 2017 |
| record_format | eprints |
| spelling | RepoSLU103272017-06-30T11:33:06Z https://stud.epsilon.slu.se/10327/ Tall trees survival in relation to bottom-up and top-down drivers in Hluhluwe-iMfolozi Park, South Africa Madsen, Petter Forestry production Tall trees are in decline throughout many national parks in South Africa. Many studies have found that trees within a certain size are preferred by elephants which damage trees by either bark stripping, breaking tree branches and/or stems or by knocking over trees (toppling). The decline of trees in relation to growing elephant populations is of growing concern, as tall trees are a key stone feature in the savanna ecosystem. One of the parks where elephant populations are increasing is in Hluwhluwe-iMfolozi Park, KwaZulu-Natal. To investigate whether trees within the park are in decline, we set out to revisit previously tagged trees from 2007 to reassess their condition. When revisiting trees a total of 260 trees were found, resulting in a 92.5% success rate in relocation of individual trees. The analyses showed that elephant impact was not descriptive of tree mortality within the park. Two tree species however, Combretum molle and Spirostachys africana, had a lower mortality risk. The risk of elephant impact was mediated by several abiotic variables, such as slope, aspect and elevation. The results of this study further accentuates the need to research the interaction between various factors to understand the causative agents of tall tree mortality. 2017-06-29 Second cycle, A2E NonPeerReviewed application/pdf en https://stud.epsilon.slu.se/10327/7/madsen_p_170630.pdf Madsen, Petter, 2017. Tall trees survival in relation to bottom-up and top-down drivers in Hluhluwe-iMfolozi Park, South Africa. Second cycle, A2E. Umeå: (S) > Dept. of Wildlife, Fish and Environmental Studies <https://stud.epsilon.slu.se/view/divisions/OID-251.html> urn:nbn:se:slu:epsilon-s-6501 eng |
| spellingShingle | Forestry production Madsen, Petter Tall trees survival in relation to bottom-up and top-down drivers in Hluhluwe-iMfolozi Park, South Africa |
| title | Tall trees survival in relation to
bottom-up and top-down drivers
in Hluhluwe-iMfolozi Park, South
Africa |
| title_full | Tall trees survival in relation to
bottom-up and top-down drivers
in Hluhluwe-iMfolozi Park, South
Africa |
| title_fullStr | Tall trees survival in relation to
bottom-up and top-down drivers
in Hluhluwe-iMfolozi Park, South
Africa |
| title_full_unstemmed | Tall trees survival in relation to
bottom-up and top-down drivers
in Hluhluwe-iMfolozi Park, South
Africa |
| title_short | Tall trees survival in relation to
bottom-up and top-down drivers
in Hluhluwe-iMfolozi Park, South
Africa |
| title_sort | tall trees survival in relation to
bottom-up and top-down drivers
in hluhluwe-imfolozi park, south
africa |
| topic | Forestry production |
| url | https://stud.epsilon.slu.se/10327/ https://stud.epsilon.slu.se/10327/ |