The diversity of Hoya (Apocynaceae: Asclepiadoideae) in some parts of Kedah and Perak Peninsular Malaysia

Azim Rabbani, . and Zakaria Rahmad, . and Rusly Rosazlina, . and Akomolafe Gbenga, . and Syed Mohd Edzham, . and Faizal Azmi, . The diversity of Hoya (Apocynaceae: Asclepiadoideae) in some parts of Kedah and Perak Peninsular Malaysia. pp. 193-203. ISSN 1511-3701

This study provided data on the diversity of Hoya species reported to occur in some parts of the northern region of Peninsular Malaysia. Seven locations were chosen between two states Kedah (Lata Celak Sedim and Bukit Hijau) and Perak (Mahang Belukar Semang Sungai Rui and Pondok Tanjung). This extensive fieldwork was carried out from 2018 until the end of 2019 to provide a baseline checklist for this genus in this northern region. All living specimens found were recorded and some species were cultivated for further identification and ex-situ conservation purposes. A total of 27 species and one variety were recorded out of which 15 species were newly reported for the northern region of Peninsular Malaysia. The newly described species Hoya peninsularis Rodda Zakaria was also reported in this study. One unknown species was found and labelled as Hoya sp. cf. scortechinii. Further identification process together with molecular analysis of this plant is still ongoing. The most diverse forests are Sungai Rui and Lata Celak having the Shannon index of 2.741 and 2.622 respectively. Both forests possess the richest in Hoya species but with low dominance index. The Sorenson similarity index is 6.74 indicating a very low similarity of Hoya species between the studied sites. Due to the high diversity recorded the number of Hoya species in the country is expected to increase if the genus is explored continuously. However most of the study areas were exposed to extreme logging activities and had a high degree of human disturbances indicating the need for intensive conservation efforts in this genus.

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Abstract

This study provided data on the diversity of Hoya species reported to occur in some parts of the northern region of Peninsular Malaysia. Seven locations were chosen between two states Kedah (Lata Celak Sedim and Bukit Hijau) and Perak (Mahang Belukar Semang Sungai Rui and Pondok Tanjung). This extensive fieldwork was carried out from 2018 until the end of 2019 to provide a baseline checklist for this genus in this northern region. All living specimens found were recorded and some species were cultivated for further identification and ex-situ conservation purposes. A total of 27 species and one variety were recorded out of which 15 species were newly reported for the northern region of Peninsular Malaysia. The newly described species Hoya peninsularis Rodda Zakaria was also reported in this study. One unknown species was found and labelled as Hoya sp. cf. scortechinii. Further identification process together with molecular analysis of this plant is still ongoing. The most diverse forests are Sungai Rui and Lata Celak having the Shannon index of 2.741 and 2.622 respectively. Both forests possess the richest in Hoya species but with low dominance index. The Sorenson similarity index is 6.74 indicating a very low similarity of Hoya species between the studied sites. Due to the high diversity recorded the number of Hoya species in the country is expected to increase if the genus is explored continuously. However most of the study areas were exposed to extreme logging activities and had a high degree of human disturbances indicating the need for intensive conservation efforts in this genus.

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Item Type:	Article
AGROVOC Term:	Apocynaceae
AGROVOC Term:	Asclepiadaceae
AGROVOC Term:	Species diversity
AGROVOC Term:	Identification
AGROVOC Term:	Taxonomy
AGROVOC Term:	Species
AGROVOC Term:	Resource conservation
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9669

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