Search

Your search keyword '"Djuita, Nina Ratna"' showing total 16 results
Start Over Author "Djuita, Nina Ratna"
16 results on '"Djuita, Nina Ratna"'

4. Melissopalynology and Vegetation Analysis Surrounding Sunggau of Giant Honey Bee Apis dorsata in Belitung Regency.

Author

Bramasta, Dwika, Qayim, Ibnul, Djuita, Nina Ratna, Raffiudin, Rika, Putra, Ramadhani Eka, Soesilohadi, R. C. Hidayat, and Purnobasuki, Hery

Subjects
HONEYBEES, PROPOLIS, MANGROVE plants, BEE pollen, FOREST conversion, POLLEN
Abstract

The forest conversion into oil palm plantations in Belitung impacts the plant source for pollen and nectar to support the honey bee Apis dorsata. This study aimed to identify the plants used by A. dorsata as pollen sources in honey and bee bread in honey bee nests and to analyze the vegetation composition and structure surrounding the sunggau (artificial nesting site) in Belitung Regency. Honey from A. dorsata was collected from bee nests in sunggau on Kampak Island and Tanjung Rusa. The pollen grains from 20 ml honey were acetolysed and counted until 1,200 grains for each honey sample. In Kampak Island, we found eight pollen types in honey dominated by Rhizophora mucronate mangrove pollen and eleven pollen types in bee bread dominated by Melaleuca cajuputi. The pollen type in honey in Tanjung Rusa was similar to those in Kampak Island, and nine pollen types were found in the bee bread dominated by Elaeis guineensis. The vegetation analysis revealed that mangrove and heath forests in Kampak Island were dominated by Lumnitzera littorea and Melaleuca cajuputi, respectively. The results of this study confirm the bees' notable use of the mangrove ecosystem, which adds conservation value, especially in supporting bee management efforts in Belitung. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

5. Autecology of Castanopsis argentea (Blume) A.DC. in Telaga Warna Nature Reserve Area, Bogor Regency

Author

Putri, Dianti Mayadika, Sulistijorini, Sulistijorini, and Djuita, Nina Ratna

Subjects
distribution pattern, endangered species, population structure
Abstract

The red list of the International Union for the Conservation of Nature and Natural Resources (IUCN) reported Castanopsis argentea as an endangered species. Studies about autecology on its natural habitat become important to perform species conservation. This study aimed to analyze the population structure, distribution pattern, and environmental factors that influence the presence of C. argentea in the Telaga Warna Nature Reserve. Data was collected in September 2020 by making 21 plots with a single plot. The purposive sampling method was used based on C. argentea representatives to determine plot location. Measurement of environmental factors, including soil sampling was carried out on each plot. Population structure was analyzed based on plant density, and Morisita index determined the distribution pattern. Environmental data were analyzed using PCA with Minitab 19 programs. Our field observation showed that C. argentea seedling has the highest density (1071 ind/ha) and decreased in the mature phase. C. argentea was found to have a clumped distribution pattern with an Id value of 1.03. PCA analysis showed differences in environmental factors that were thought to influence the presence of C. argentea individuals in four growth phases. The highest population structure of C. argentea was found in the growth phase of seedlings and saplings at an altitude of 1400 m asl. The spread population distribution of C. argentea was clumped. The influences of environmental variables on the existence of C. argentea were Mg, Ca, CEC, pH, and soil moisture.

Published
2022

Catalog

Books, media, physical & digital resources
See catalog results