Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot

The intensely rich flora of lowland tropical rain forests includes rare species that represent a significant portion of the overall diversity. In the Pasoh Forest Reserve, Malaysia, Timonius is represented by two sympatric species: T. wallichianus, and a new species described and illustrated here. T...

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Main Authors: Hoo, P. K., Musalmah, N., Cheah, Y. H., Wong, K. M., Sugumaran, M.
Format: Article
Published: Forest Research Institute Malaysia 2024
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Online Access:http://eprints.um.edu.my/47087/
https://jtfs.frim.gov.my/jtfs/article/view/2828
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spelling my.um.eprints.470872024-11-28T07:02:26Z http://eprints.um.edu.my/47087/ Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot Hoo, P. K. Musalmah, N. Cheah, Y. H. Wong, K. M. Sugumaran, M. QH Natural history The intensely rich flora of lowland tropical rain forests includes rare species that represent a significant portion of the overall diversity. In the Pasoh Forest Reserve, Malaysia, Timonius is represented by two sympatric species: T. wallichianus, and a new species described and illustrated here. The new species T. pasohensis is rare and so far known only from this reserve. The population characteristics of the new species and the commoner and more widespread T. wallichianus were compared in the 50-ha plot. The distribution of both species overlapped in several habitat types. The torus translation test indicated that T. pasohensis is positively associated with swamps and slopes, whereas T. wallichianus prefers alluvium. However, other factors such as competition, fecundity, susceptibility to droughts, and herbivory, may also be important in influencing the distribution of the two species. They have a similar population structure but are distinctly different in other aspects. From 1986 to 2015, the abundance of T. pasohensis has greatly declined to less than half its original population, and saplings and trees < 10 cm diameter at breast height appear to be the most affected. In contrast, the population size of T. wallichianus has remained relatively stable during the same period, possibly owing to the abundance of suitable habitat type and higher seed set. Forest Research Institute Malaysia 2024 Article PeerReviewed Hoo, P. K. and Musalmah, N. and Cheah, Y. H. and Wong, K. M. and Sugumaran, M. (2024) Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot. Journal of Tropical Forest ScienceE, 36 (3). pp. 327-337. ISSN 0128-1283, DOI https://doi.org/10.26525/jtfs2024.36.3.327 <https://doi.org/10.26525/jtfs2024.36.3.327>. https://jtfs.frim.gov.my/jtfs/article/view/2828 10.26525/jtfs2024.36.3.327
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QH Natural history
spellingShingle QH Natural history
Hoo, P. K.
Musalmah, N.
Cheah, Y. H.
Wong, K. M.
Sugumaran, M.
Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot
description The intensely rich flora of lowland tropical rain forests includes rare species that represent a significant portion of the overall diversity. In the Pasoh Forest Reserve, Malaysia, Timonius is represented by two sympatric species: T. wallichianus, and a new species described and illustrated here. The new species T. pasohensis is rare and so far known only from this reserve. The population characteristics of the new species and the commoner and more widespread T. wallichianus were compared in the 50-ha plot. The distribution of both species overlapped in several habitat types. The torus translation test indicated that T. pasohensis is positively associated with swamps and slopes, whereas T. wallichianus prefers alluvium. However, other factors such as competition, fecundity, susceptibility to droughts, and herbivory, may also be important in influencing the distribution of the two species. They have a similar population structure but are distinctly different in other aspects. From 1986 to 2015, the abundance of T. pasohensis has greatly declined to less than half its original population, and saplings and trees < 10 cm diameter at breast height appear to be the most affected. In contrast, the population size of T. wallichianus has remained relatively stable during the same period, possibly owing to the abundance of suitable habitat type and higher seed set.
format Article
author Hoo, P. K.
Musalmah, N.
Cheah, Y. H.
Wong, K. M.
Sugumaran, M.
author_facet Hoo, P. K.
Musalmah, N.
Cheah, Y. H.
Wong, K. M.
Sugumaran, M.
author_sort Hoo, P. K.
title Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot
title_short Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot
title_full Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot
title_fullStr Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot
title_full_unstemmed Timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot
title_sort timonius pasohensis (rubiaceae), a rare new species from pasoh forest, malaysia, and its population characteristics in the 50-ha forest dynamics plot
publisher Forest Research Institute Malaysia
publishDate 2024
url http://eprints.um.edu.my/47087/
https://jtfs.frim.gov.my/jtfs/article/view/2828
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