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All Journal REINWARDTIA Jurnal Riset Rumpun Ilmu Tanaman Reinwardtia
NURHAIDAH IRIANY SINAGA
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology

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TWO NEW SPECIES OF FREYCINETIA (PANDANACEAE) FROM MANOKWARI, WEST PAPUA NURHAIDAH IRIANY SINAGA
Reinwardtia Vol. 13 No. 2 (2010)
Publisher : BRIN Publishing (Penerbit BRIN)

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Abstract

SINAGA, N. I. 2010. Two new species of Freycinetia (Pandanaceae) from Manokwari, Papua. Reinwardtia 13(2): 183-187. - Two new species of Freycinetia from Manokwari, Papua were described; Freycinetia gunungmejensis Sinaga and Freycinetia aculeata Sinaga. These two species are placed into two different groups. F. gunungmejaensis is placed in the non imbricate leaves group that has a non imbricate arrangement of leaves, caducous auricle, 1-keeled prophyll at the base of inflorescence, auxiliary or terminal inflorescence, and with cauline leaves on the terminal inflorescence/ Whereas F. aculeata is included in the imbricate leaves group that has an imbricate arrangement of leaves, persistent auricle, without prophyll, terminal inflorescence and without cauline leaves. The differences between these new species and closely related species are discussed below and their description and distributions are provided.
THE ECOLOGY AND DISTRIBUTION OF FREYCINETIA GAUD. (PANDANACEAE; FREYCINETOIDEAE) IN THE INDONESIAN NEW GUINEA NURHAIDAH IRIANY SINAGA; RITA MEGIA; ALEX HARTANA; ARY PRIHARDHYANTO KEIM
Reinwardtia Vol. 13 No. 2 (2010)
Publisher : BRIN Publishing (Penerbit BRIN)

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Abstract

SINAGA, N. I., MEGIA, R., HARTANA, A., KEIM, A. P. Ecology and distribution of Freycinetia Gaud. (Pandanaceae; Freycinetoidea) in Indonesian New Guinea. Reinwardtia 13(2): 189-197. - The study mainly concerns with the species of Freycinetia that occurs in the Indonesian New Guinea, including the provinces of Papua and Papua Barat. The study indicates that almost all species of Freycinetia in the Indonesian New Guinea prefer high humidity and abundantly occur along rivers, except for the members of the group of species with imbricate leaves, which inhabit also secondary forests. Futhermore, the members of this group have never been found within the range of 1700 to 3000 m altitudes. This highest range of altitudes is specifically occupied by the members of the groups of species with semi imbricate and grass-like leaves. The costal forests are inhabited by the groups of species with semi and non imbricate leaves. Indonesian New Guinea shares many species with Papua New Guinea, except for the members of the group of species with semi imbricate leaves, which are more common in Indonesian New Guinea than in Papua New Guinea. On the contrary, the members of the group of species with grass-like leaves are more common in Papua New Guinea and becoming rare toward the Indonesian site and becoming absent in the Vogelklop (Bird's head), except for F. polyclada which is commonly found in Sorong. Indonesian New Guinea possesses 34 species exclusively distributed in the area, while Papua New Guinea has 72 species. The two areas share 52 species. Only five species have extra New Guinean distributions, i.e. F. excelsa, F. funicularis, F. marginata, F. percostata, and F. scandens
The unique characters and habitat of Freycinetia (Pandanaceae) with seven new species in Timika, West Papua, Indonesia Nurhaidah Iriany Sinaga; Ary Prihardhyanto Keim; Pratita Puradyatmika
Reinwardtia Vol. 13 No. 5 (2013)
Publisher : BRIN Publishing (Penerbit BRIN)

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Abstract

This current study of Freycinetia was carried out in Timika, West Papua. Results indicate that species vary in both morphological characters and habitat preferences. Timika is unique as only in this area species with highest number of segments in a berry and of stigmatic remains are found. Exceptional characters regarding to auricles, areolas, and stigmatic remains are observed in many species in this area. The result of this current study suggests that the ability of species to adapt to the widespread forest disturbances in Timika leads to their differences in morphological features compare to other Papuan species. Subsequently, seven new species are described here.
TWO NEW SPECIES OF FREYCINETIA (PANDANACEAE) FROM MANOKWARI, WEST PAPUA NURHAIDAH IRIANY SINAGA
Reinwardtia Vol. 13 No. 2 (2010)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

SINAGA, N. I. 2010. Two new species of Freycinetia (Pandanaceae) from Manokwari, Papua. Reinwardtia 13(2): 183-187. - Two new species of Freycinetia from Manokwari, Papua were described; Freycinetia gunungmejensis Sinaga and Freycinetia aculeata Sinaga. These two species are placed into two different groups. F. gunungmejaensis is placed in the non imbricate leaves group that has a non imbricate arrangement of leaves, caducous auricle, 1-keeled prophyll at the base of inflorescence, auxiliary or terminal inflorescence, and with cauline leaves on the terminal inflorescence/ Whereas F. aculeata is included in the imbricate leaves group that has an imbricate arrangement of leaves, persistent auricle, without prophyll, terminal inflorescence and without cauline leaves. The differences between these new species and closely related species are discussed below and their description and distributions are provided.
THE ECOLOGY AND DISTRIBUTION OF FREYCINETIA GAUD. (PANDANACEAE; FREYCINETOIDEAE) IN THE INDONESIAN NEW GUINEA NURHAIDAH IRIANY SINAGA; RITA MEGIA; ALEX HARTANA; ARY PRIHARDHYANTO KEIM
Reinwardtia Vol. 13 No. 2 (2010)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

SINAGA, N. I., MEGIA, R., HARTANA, A., KEIM, A. P. Ecology and distribution of Freycinetia Gaud. (Pandanaceae; Freycinetoidea) in Indonesian New Guinea. Reinwardtia 13(2): 189-197. - The study mainly concerns with the species of Freycinetia that occurs in the Indonesian New Guinea, including the provinces of Papua and Papua Barat. The study indicates that almost all species of Freycinetia in the Indonesian New Guinea prefer high humidity and abundantly occur along rivers, except for the members of the group of species with imbricate leaves, which inhabit also secondary forests. Futhermore, the members of this group have never been found within the range of 1700 to 3000 m altitudes. This highest range of altitudes is specifically occupied by the members of the groups of species with semi imbricate and grass-like leaves. The costal forests are inhabited by the groups of species with semi and non imbricate leaves. Indonesian New Guinea shares many species with Papua New Guinea, except for the members of the group of species with semi imbricate leaves, which are more common in Indonesian New Guinea than in Papua New Guinea. On the contrary, the members of the group of species with grass-like leaves are more common in Papua New Guinea and becoming rare toward the Indonesian site and becoming absent in the Vogelklop (Bird's head), except for F. polyclada which is commonly found in Sorong. Indonesian New Guinea possesses 34 species exclusively distributed in the area, while Papua New Guinea has 72 species. The two areas share 52 species. Only five species have extra New Guinean distributions, i.e. F. excelsa, F. funicularis, F. marginata, F. percostata, and F. scandens
The unique characters and habitat of Freycinetia (Pandanaceae) with seven new species in Timika, West Papua, Indonesia Nurhaidah Iriany Sinaga; Ary Prihardhyanto Keim; Pratita Puradyatmika
Reinwardtia Vol. 13 No. 5 (2013)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This current study of Freycinetia was carried out in Timika, West Papua. Results indicate that species vary in both morphological characters and habitat preferences. Timika is unique as only in this area species with highest number of segments in a berry and of stigmatic remains are found. Exceptional characters regarding to auricles, areolas, and stigmatic remains are observed in many species in this area. The result of this current study suggests that the ability of species to adapt to the widespread forest disturbances in Timika leads to their differences in morphological features compare to other Papuan species. Subsequently, seven new species are described here.
Analisis Willingness to Pay (WTP) Pengunjung terhadap Pengembangan Kawasan Taman Wisata Alam (TWA) Gunung Meja Meyanti Toding Buak; Bambang Nugroho; Nurhaidah Iriany Sinaga
Jurnal Riset Rumpun Ilmu Tanaman Vol. 5 No. 1 (2026): April: JURRIT: Jurnal Riset Rumpun Ilmu Tanaman
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrit.v5i1.8730

Abstract

This study aims to analyze visitors’ Willingness to Pay (WTP) and to estimate the economic value in supporting the development of Gunung Meja Nature Tourism Park (TWA) as a conservation area. This study employed the Contingent Valuation Method (CVM) with a total of 156 respondents. Data were analyzed using descriptive quantitative methods to obtain the average WTP value and its distribution. The results showed that the average WTP of visitors was IDR 19,300 per person, with the highest distribution in the range of IDR 10,000–30,000 and a dominant value of IDR 20,000 (23%). The estimated economic value of the area based on WTP reached IDR 3,939,245,800 per year, which is higher than the actual revenue of IDR 2,755,431,000 per year. The difference of IDR 1,183,814,800 indicates a potential increase in revenue through tariff adjustment. These findings indicate that visitors have a higher willingness to pay compared to the current tariff. Therefore, the WTP value can be used as a basis for determining optimal tariff policies to support sustainable management of conservation areas and to maintain their ecological functions.
Co-Authors Alex Hartana Ary PRIHARDHYANTO Keim Bambang Nugroho Meyanti Toding Buak Pratita Puradyatmika Rita Megia