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All Journal Ecotrophic, Journal of Environmental Science Biodiversitas Journal of Biological Diversity
I Made Abdi Janaguna
Department Of Aquatic Resources Management, Faculty Of Agriculture, Science And Technology, Universitas Warmadewa. Jl. Terompong No. 24, Denpasar 80235, Bali, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science

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KARAKTER VEGETASI, KEANEKARAGAMAN MAKROZOOBENTOS DAN KARBON PADA SEDIMEN DI KAWASAN MANGROVE NUSA LEMBONGAN DAN ESTUARI PERANCAK I Made Abdi Janaguna; I Wayan Arthana; Ni Luh Watiniasih
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 17 No 1 (2023)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2023.v17.i01.p03

Abstract

Natural mangroves can be found in Nusa Lembongan, which is bordered by coral reefs, while in the Perancak Estuary, some of the lands are former ponds. The aim of the study was to determine the density, canopy cover, and organic carbon content in mangrove sediments. Data were collected from 3 stations, using transects measuring 10 x 10 m to determine density, height, trunk circumference, and canopy cover, as well as macrozoobenthos sampling. The mangrove density in Lembongan is very high, the tree height reaches 8 – 10 meters, and the mangrove canopy cover is in a good category. The macrozoobenthos diversity index is in the medium category and the carbon content in the sediments is high. Mangroves in Perancak Estuary are densely dense, with an average tree height of 8 meters, and canopy cover in the good category. The index of macrozoobenthos diversity was moderate and the organic carbon in the sediments was lower than in the mangroves at Nusa Lembongan. The character of the mangrove vegetation is different in the two areas. The Nusa Lembongan mangrove growing area is directly opposite the sea, but in the Perancak Estuary, it tends to be closed and flows by a large river around it. The mangrove growth zone is still natural in the Nusa Lembongan area, in contrast to the Perancak Estuary mangrove area which has been rehabilitated at several points. Keywords: Mangrove vegetation; macrozoobenthos; carbon on sediment
Ecological diagnosis of Lake Batur (Bali, Indonesia) post-disturbance using multimetric phytoplankton indices SANG AYU MADE PUTRI SURYANI; I GEDE SUDIARTA; NI MADE DARMADI; DEWA GEDE SEMARA EDI; I KETUT SUDIARTA; GEDE AGUS SURYA PRATAMA; I MADE ABDI JANAGUNA; I PUTU SUGIANA
Biodiversitas Journal of Biological Diversity Vol. 26 No. 10 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d261014

Abstract

Abstract. Suryani SAMP, Sudiarta IG, Darmadi NM, Edi DGS, Sudiarta IK, Pratama GAS, Janaguna IMA, Sugiana IP. 2025. Ecological diagnosis of Lake Batur (Bali, Indonesia) post-disturbance using multimetric phytoplankton indices. Biodiversitas 26: 4982-4990. Plankton communities are rapid responders to environmental change and serve as sensitive indicators of ecological stress in tropical volcanic lakes. In July 2025, Lake Batur (Bali, Indonesia) experienced a major fish mortality linked to hypolimnetic upwelling and nutrient enrichment from aquaculture. To assess post-disturbance conditions, we sampled three sites with varying aquaculture intensity—Seked (low), Buahan (moderate), and Trunyan (high, mortality epicenter)—one week after the event. Field measurements included temperature, pH, dissolved oxygen, conductivity, redox potential, nutrients, and sulfide, while phytoplankton analysis covered diversity (Shannon–Wiener), evenness (Pielou), dominance (Simpson), and saprobity (Dahuri). Results revealed clear spatial contrasts. Trunyan showed the strongest stress signals, with oxygen depletion, negative redox potential, and elevated ammonia, while Seked and Buahan displayed milder alterations. In total, 23 phytoplankton genera were identified, dominated by diatoms such as Ulnaria and Actinotaenium. Trunyan exhibited reduced richness, lower diversity (H’ = 1.84), and higher dominance (D = 0.27), indicating a shift toward opportunistic taxa. Saprobity values showed a gradient of organic pollution, increasing from Seked (1.5) to Trunyan (2.0), consistent with aquaculture intensity. These findings highlight the value of integrating multimetric plankton indices with physicochemical data to distinguish natural upwelling effects from anthropogenic nutrient loading. While diatom persistence suggests some resilience, recovery of sensitive taxa depends on reducing nutrient inputs and regulating aquaculture. This integrative framework offers a practical diagnostic tool for adaptive lake management and contributes to achieving clean water, climate action, and aquatic biodiversity goals.
Integrated multimetric assessment of mangrove-seagrass-plankton systems across spatial gradients in Banyuwedang Bay, Bali, Indonesia I PUTU SUGIANA; I MADE ABDI JANAGUNA; SAMUDRA ALFATIHA; I MADE SAKA WIJAYA; I GEDE ADHITIYA YASA; I WAYAN GDE SUTASOMA
Biodiversitas Journal of Biological Diversity Vol. 27 No. 4 (2026)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d270416

Abstract

Abstract. Sugiana IP, Janaguna IMA, Alfatiha S, Wijaya IMS, Yasa IGA, Sutasoma IWG. 2026. Integrated multimetric assessment of mangrove-seagrass-plankton systems across spatial gradients in Banyuwedang Bay, Bali, Indonesia. Biodiversitas 27 (4): d270416. https://doi.org/10.13057/biodiv/d270416. North Bali coastal waters host interconnected mangrove-seagrass-plankton systems that respond to spatial gradients in physicochemical conditions. This study provides a multimetric baseline assessment integrating environmental parameters with mangrove, seagrass, and plankton indicators across three stations (S1-S3) in Banyuwedang Bay (November 2025), emphasizing spatial ecological patterns rather than inferential relationships. The analysis integrates environmental parameters with ecological indicators of mangroves (Mangrove Health Index, MHI), seagrass (Seagrass Ecological Quality Index, SEQI), and plankton communities (diversity H’, evenness J, and dominance C). Environmental conditions varied spatially, with higher suspended solids at the inner bay and increasing temperature, salinity, and conductivity toward the outer bay. Mangrove ecosystems were consistently classified as excellent (MHI: 67.45-75.98), indicating structurally stable stands despite differences in species composition. In contrast, seagrass meadows exhibited moderate ecological condition (SEQI: 0.63-0.67), reflecting variation between species richness at the inner station and higher coverage at the mid-bay station. Plankton communities showed moderate diversity (phytoplankton H’: 1.31-1.75; zooplankton H’: 0.83-1.80) with localized dominance at the mid-bay station, indicating spatial heterogeneity in community structure. Diatoms dominated across stations, while cyanobacteria increased at one location, suggesting spatial variability associated with environmental gradients. Zooplankton communities displayed relatively high evenness across stations. Overall, the integrated multimetric approach reveals that coastal ecosystems in Banyuwedang Bay remain functionally intact but exhibit clear spatial heterogeneity along the inner-outer gradient. This study provides an integrated baseline framework linking benthic and pelagic indicators for future monitoring and adaptive coastal management in relatively low-disturbance tropical bays.
Co-Authors DEWA GEDE SEMARA EDI GEDE AGUS SURYA PRATAMA I GEDE SUDIARTA I GEDE ADHITIYA YASA I KETUT SUDIARTA I MADE SAKA WIJAYA I Wayan Arthana I WAYAN GDE SUTASOMA Ni Luh Watiniasih NI MADE DARMADI SAMUDRA ALFATIHA SANG AYU MADE PUTRI SURYANI Sugiana, I Putu