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CHRISTIAN HANSJOACHIM SCHULZE
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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Functional Group of Spiders in Cultivated Landscape Dominated by Paddy Fields in West Java, Indonesia I WAYAN SUANA; DEDY DURYADI SOLIHIN; DAMAYANTI BUCHORI; SJAFRIDA MANUWOTO; HERMANU TRIWIDODO; CHRISTIAN HANSJOACHIM SCHULZE
HAYATI Journal of Biosciences Vol. 16 No. 1 (2009): March 2009
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.548 KB) | DOI: 10.4308/hjb.16.1.1

Abstract

Distribution of spiders in all colonized environments is limited by biotic and abiotic factors requiring adaptations with respect to, for example microhabitat choice and hunting behavior. These two factors were frequently used to group spiders into functional groups. In this study our objectives were to (i) group of genera of spiders into functional group based on their microhabitat specificity, hunting behavior, and daily activity; and (ii) compare the number and composition of functional group of spider at each habitat type and period of paddy growth. The study was conducted at a landscape dominated by paddy fields in Cianjur Watershed for a period of 9 months. Four different habitat types (paddy, vegetable, non-crop, and mixed garden), were sampled using five trapping techniques (pitfall traps, farmcop suction, sweep netting, yellow-pan traps, and sticky traps). The Unweighted Pair-Group Average and the Euclidean Distances were used to generate dendrogram of functional group of spider. We found 14 functional groups of spider at genus level. The number of functional group of spider at four habitat types was differing, but the composition was similar, because all habitats were closed to each other. Habitat structure diversity and disturbance level influenced the number of functional group of spider. Different architecture of vegetation and availability of differ prey during paddy growth, causing the composition of functional group of spider in each period of paddy growth was changed, although its number was unchanged. Key words: spiders, functional group, agricultural landscape, Cianjur Watershed
Ants in Tropical Urban Habitats: The Myrmecofauna in a Densely Populated Area of Bogor, West Java, Indonesia AKHMAD RIZALI; MERIJN MARINUS BOS; DAMAYANTI BUCHORI; SEIKI YAMANE; CHRISTIAN HANSJOACHIM SCHULZE
HAYATI Journal of Biosciences Vol. 15 No. 2 (2008): June 2008
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (184.437 KB) | DOI: 10.4308/hjb.15.2.77

Abstract

Ants are the most abundant animals in tropical habitats and have been widely studied in natural and semi-natural tropical systems. However, species in urban tropical habitats remain poorly studied, despite their abundance and potentially important roles in urban ecosystems and pest dynamics. We investigated the ant fauna of Bogor and its surroundings to contribute to the characterization of the myrmecofauna of one of Southeast Asia’s most densely populated regions. Ants were collected both by hand collection and from honey baits in the most common habitats: garbage dumps, households, and home gardens. In total, 94 species were recorded, over two thirds of which occurred in home gardens, which underlines the importance of vegetated habitats for urban planning to support complex ant assemblages. Twelve sampled species are well-known as tramp species that occur primarily in human-dominated landscapes. The two tramp species Anoplolepis gracilipes and Paratrechina longicornis dominated ant assemblages in all locations and most habitat types. The assemblages of tramp species were affected by habitat type, whereas that of non tramp species were not. Forty-five species were also recorded in the Bogor Botanical Garden and five species are also known to be common in cacao agroforests. Hence, research in urban tropical habitats can increase our knowledge of the occurrence of ant species, allowing us to better assess the biodiversity and conservation potential of semi-natural habitats. Key words: ants, tramp species, invasive species, biotic homogenization, urban habitats
Co-Authors Akhmad Rizali DAMAYANTI BUCHORI Hermanu Triwidodo I WAYAN SUANA MERIJN MARINUS BOS SEIKI YAMANE SJAFRIDA MANUWOTO TARUNI SRI PRAWAST MIEN KAOMINI ANY ARYANI DEDY DURYADI SOLIHIN